1995-14590-Ordinance No. 95-037 Recorded 5/4/1995REVIEWED
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BEFORE THE BOARD OF COUNTY COMMISSIONERS OF
An Ordinance Amending Chapter 13.08 of
the Deschutes County Code, Relating
to On -Site Sewage Disposal and
Declaring an Emergency. 95-14590*
ORDINANCE NO. 95-037
LEGAL. COUNSEL
DESCHUTES COUNTY, OREGON
a,r
THE BOARD OF COUNTY COMMISSIONERS OF DESCHUTES COUNTY, ".OREGON,
ORDAINS as follows:
Section 1. Adoption. That the Oregon Administrative Rules
adopted by the Department of Environmental Quality pertaining to on-
site sewage Disposal (OAR Chapter 340 - Divisions 71 and 73) as
attached hereto as Exhibit "A" and by this reference incorporated
herein are hereby adopted by the County as its rules pertaining to on-
site sewage disposal.
Section 2. Repeal. That the Oregon Administrative Rules
pertaining to on-site sewage adopted by Ordinance 91-043 and found at
volume 107, pages 1846 to 2050 of the Deschutes County Commissioner's
Journal are hereby repealed and superseded by the rules adopted
pursuant to Section 1 of this Ordinance.
Section 3. Repeal of Ordinances as Affecting Existing
Liabilities. The repeal, express or implied, of any ordinance,
ordinance provision, code section, or any map or any line on a map
incorporated therein by reference, by this amending ordinance shall not
release or extinguish any duty, condition, penalty, forfeiture, or
liability previously incurred or that may hereafter be incurred under
such ordinance, unless a provision of this amending ordinance shall so
expressly provide, and such ordinance repealed shall be treated as
still remaining in force for the purpose of sustaining any proper
action or prosecution for the enforcement of such duty, condition,
penalty, forfeiture, or liability, and for the purpose of authorizing
the prosecution, conviction and punishment of the person or persons who
previously violated the repealed ordinance.
Section 4. Codification. County Legal Counsel shall have the
authority to format the provisions contained herein in a manner that
will integrate them into the County Code consistent with the Deschutes
County Form and Style Manual for Board Documents. Such codification
shall include the authority to make such changes, to make changes in
numbering systems and to make such numbering changes consistent with
interrelated code sections. In addition, as part of codification of
these ordinances, County Legal Counsel may insert appropriate
legislative history reference. Any legislative history references
included herein are not adopted as part of the substance of this
ordinance, but are included for administrative convenience and as a
reference. They may be changed to correct errors and to conform to
PAGE 1 - ORDINANCE NO. 95-037 (4-3-95) 0,C F� p
MAY 1 01995 19
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proper style without action of the Board of County Commissioners.
Section 5. Emergency. This ordinance being necessary for the
immediate preservation of the public peace, health and safety, an
emergency is declared to exist, and this ordinance takes effect on its
passage.
DATED this 3rd day of May, 1995.
BOARD OF COUNTY COMMISSIONERS
OF DESCHUTES COUNTY, OREGON
n
H. SLAj3GHTER, Chairman
ATT T: NANCY POPE SCH�ANGEN, CommissIner
Recording Secr tary ROB RT L. NIPPER, issioner
PAGE 2 - ORDINANCE NO. 95-037 (4-3-95)
EXHIBIT "A"
DEPARTMENT OF ENVIRONMENTAL QUALITY
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Water Quality Program
OREGON ADMINISTRATIVE RULES FOR
ON-SITE SEWAGE DISPOSAL
CHAPTER 3409 DIVISION 71
[Ed. Note: All tables referred
to in the text of Division 71 may be found in numerical
order following the text of these rules.]
INDIVIDUAL ON-SITE SYSTEMS
340-71-100 DEFINITIONS.
As used in OAR 340, Divisions 71, 72, and 73, unless otherwise specified:
(1) "Absorption Facility" means a system of open jointed or perforated piping,
alternative distribution units, or other seepage systems for receiving the flow
from septic tanks or other treatment facilities and designed to distribute
effluent for oxidation and absorption by the soil within the zone of aeration.
(2) "Active Sand Dune" means wind drifted ridges and intervening valleys,
pockets, and swales of sand adjacent to the beach. The sand is grayish -
brown (color value of four (4) or more), with little or no horizon, color, or
textured differences. Active dunes are either bare of vegetation or lack
sufficient vegetation to prevent blowing of sand.
(3) "Aerobic Sewage Treatment Facility" means a sewage treatment plant
which incorporates a means of introducing air and oxygen into the sewage so
as to provide aerobic biochemical stabilization during a detention period.
Aerobic sewage treatment facilities may include anaerobic processes as part
of the treatment system. Mechanical Oxidation Sewage Treatment Facility
means an aerobic treatment facility.
(4) "Aerobic System" means an alternative system consisting of a septic tank
or other treatment facility, an aerobic sewage treatment facility and an
absorption facility, designed to provide a level of treatment before disposal.
(5) "Agent" means the Director or that person's authorized representative.
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(6) "Alteration" means expansion and/or change in location of an existing
system, or any part thereof.
(7) "Alternative System" means any Commission approved on-site sewage
disposal system identified_ within this division, for use in lieu of the standard
subsurface system.
(8) "Approved Material" means construction items that have been reviewed
and accepted for use by the Department.
(9) "Approved Criteria" means methods of design or construction that have
been reviewed by the Technical Review Committee (TRC) and accepted for
use by the Department.
(10) "ASTM" means American Society of Testing Materials.
(11) "Authorization Notice" means a written document issued by the Agent
which establishes that an existing on-site sewage disposal system appears
adequate to serve the purpose for which a particular application is made.
(12) "Authorized Representative" means the staff of the Department of
Environmental Quality or staff of the local governmental unit performing
duties for and under agreement with the Department of Environmental
Quality.
(13) "Automatic Siphon" means a hydraulic device designed to rapidly
discharge the contents of a dosing tank between predetermined water or
sewage levels.
(14) "Bedroom" means any room within a dwelling which is accepted as such by
the State of Oregon Department of Commerce building codes representative
or the local authorized building official having jurisdiction.
(15) "Biochemical Oxygen Demand (BOD)" means a measure of the decompos-
able organic matter in wastewater. It is used as an indication of wastewater
strength. For the purpose of these rules, all references to BOD shall be for
the five day BOD.
(16) "Black Waste" means human body wastes including feces, urine, other ex-
traneous substances of body origin and toilet paper.
(17) "Capping Fill System" means an alternative system where the disposal
trench effective sidewall is installed a minimum of twelve (12) inches into
the natural soil below a soil cap of specified depth and texture.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(18) "Cesspool" means a lined pit which receives raw sewage, allows separation
of solids and liquids, retains the solids and allows liquids to seep into the
surrounding soil through perforations in the lining.
(19) "Chemical Recirculating Toilet Facility" means a toilet facility wherein
black wastes are deposited and carried from the bowl by a combination of
liquid waste and water which has been chemically treated and filtered.
(20) "Chemical Toilet Facility" means a non -flushing, non -recirculating toilet
facility wherein black wastes are deposited directly into a chamber
containing a solution of water and chemical.
(21) "Clayey Soil" means mineral soil that is over forty (40) percent clay that
shrinks and develops wide cracks when dry and swells and shears when wet
forming slickensides and wedge-shaped structure. Clayey soil is very hard
or extremely hard when dry, very firm when moist, and very sticky and very
plastic when wet.
(22) "Claypan" means a dense, compact clay layer in the subsoil. It has a much
higher clay content than the overlying soil horizon from which it is separated
by an abrupt boundary. Claypans are hard when dry and very sticky and
very plastic when wet. They impede movement of water and air and growth
of plant roots.
(23) "Combustion Toilet Facility" means a toilet facility wherein black wastes
are deposited directly into a combination chamber for incineration.
(24) "Commercial Facility" means any structure or building, or any portion
thereof, other than a single-family dwelling.
(25) "Commission" means the Environmental Quality Commission.
(26) "Community System" means an on-site system which will serve more than
one (1) lot or parcel or more than one (1) condominium unit or more than
one (1) unit of a planned unit development.
(27) "Completed Application" means one in which the application form is com-
pleted in full, is signed by the owner or that person's authorized representa-
tive, and is accompanied by all required exhibits and required fee.
(28) "Conditions Associated With Saturation" means:
(a) Reddish brown or brown soil horizons with gray (chromas of two (2)
or less) and red or yellowish red mottles; or
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(b) Gray soil horizons, or gray soil horizons with red, yellowish red, or
brown mottles; or
(c) Dark colored highly organic soil horizons; or
(d) Soil profiles with concentrations of soluble salt at or near the ground
surface.
(29) "Confining Layer" means a layer associated with an aquifer that because of
its low permeability does not allow water to move through it perceptibly
under head differences occurring in the groundwater system.
(30) "Construction" includes installation of a new system or part thereof, or the
alteration, repair or extension of an existing system. The grading, ex-
cavating, and earth -moving work connected with installation, alteration, or
repair of a system, or part thereof, is considered a part of system con-
struction.
(31) "Conventional Sand Filter" means a filter with two (2) feet or more of
medium sand designed to chemically and biologically process septic tank or
other treatment unit effluent from a pressure distribution system operated on
an intermittent basis.
(32) "Curtain Drain" means a groundwater interceptor that is installed as a
trench with a minimum width of twelve (12) inches and extending into the
layer that limits effective soil depth. It has a perforated pipe installed along
the bottom of, and the length of the trench and has a minimum of twelve
(12) inches of drain media over the drainline and filter fabric placed over the
drain media. The curtain drain must meet the setbacks from septic tanks and
disposal areas as required in Table 1.
(33) "Cut -Manmade" means a land surface resulting from mechanical land
shaping operations where the modified slope is greater than fifty (50)
percent, and the depth of cut exceeds thirty (30) inches.
(34) "Department" means the Department of Environmental Quality.
(35) "Design Criteria" means the criteria used in designing on-site sewage
disposal systems including, but not necessarily limited to, dimensions,
geometry, type of materials, size of drain media or filter media, disposal
field sizing, depth, grade or slope, hydraulic loading rate or any other factor
relevant to the successful operation of the system. It does not include
disposal area siting criteria.
(36) "Director" means the Director of the Department of Environmental Quality.
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(37) `Disposal Area" means the entire area used for underground dispersion of
the liquid portion of sewage including the area designated for the future
replacement system. It may consist of a seepage pit or of a disposal field or
of a combination of the two. It may also consist of a cesspool, seepage bed,
bottomless sand filter, or evapotranspiration -absorption system.
(38) "Disposal Field" means a system of disposal trenches or a seepage trench
or system of seepage trenches.
(39) "Disposal Trench" means a ditch or a trench installed into natural soil,
permeable saprolite or diggable bedrock, with vertical sides and substantially
flat bottom with a minimum of twelve (12) inches of clean, coarse drain
media or other material that is used in these rules into which a single
distribution pipe has been laid, the trench then being backfilled with a
minimum of six (6) inches of soil.
(40) "Distribution Box" means a watertight structure which receives septic tank
or other treatment facility effluent and distributes it concurrently into two (2)
or more header pipes leading to the disposal area. (See OAR 340-73-035).
(41) "Distribution Pipe" means an open jointed or perforated pipe used in the
dispersion of septic tank or other treatment facility effluent into disposal
trenches, seepage trenches, or seepage beds.
(42) "Distribution Unit" means a distribution box, dosing tank, diversion valve
or box, header pipe, or other means of transmitting septic tank or other
treatment unit effluent from the effluent sewer to the distribution pipes.
(43) "Diversion Valve" means a watertight structure which receives septic tank
or other treatment facility effluent through one (1) inlet, distributes it to two
(2) outlets, only one (1) of which is utilized at a given time (See OAR
340-73-045).
(44) Dosing Tank" means a watertight receptacle placed after a septic tank or
other treatment facility equipped with an automatic siphon or pump.
(45) "Dosing Septic Tank" means a unitized device performing functions of
both a septic tank and a dosing tank.
(46) "Drainfield" means a Disposal Field.
(47) "Drain Media" means clean washed gravel, clean crushed rock, or other
media approved by the Director's Designee, for the purpose of distributing
effluent. When gravel or crushed rock is used it shall have a minimum size
of three quarters (3/4) inches and a maximum size of two and one-half
(2-1/2) inches. The material shall be durable and inert so that it will
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maintain its integrity and not collapse or disintegrate with time and shall not
be detrimental to the performance of the system.
(48) "Dwelling" means any structure or building, or any portion thereof which is
used, intended, or designed to be occupied for human living purposes in-
cluding, but not limited to: houses, houseboats, boathouses, mobile homes,
travel trailers, hotels, motels, and apartments.
(49) "Effective Seepage Area" means the sidewall area within a disposal trench
or a seepage trench from the bottom of the trench to a level two (2) inches
above the distribution pipes, or the sidewall area of any cesspool, seepage
pit, unsealed earth pit privy, or gray water waste disposal sump seepage
chamber; or the bottom area of a pressurized soil absorption facility installed
in soil as defined in section (139) this rule.
(50) "Effective Soil Depth" means the depth of soil material above a layer that
impedes movement of water, air, and growth of plant roots. Layers that
differ from overlying soil material enough to limit effective soil depth are
hardpans, claypans, fragipans, compacted soil, bedrock, saprolite, and
clayey soil.
(51) "Effluent Filter" means an effluent treatment device installed on the outlet
of a septic tank which is designed to prevent the passage of suspended matter
larger than one-eighth inch in size.
(52) "Effluent Lift Pump" means a pump used to lift septic tank or other treat-
ment facility effluent to a higher elevation. (See OAR 340-73-055).
(53) "Effluent Sewer" means that part of the system of drainage piping that
conveys partially treated sewage from a septic tank or other treatment facility
into a distribution unit or an absorption facility. (See OAR 340-73-060).
(54) "Emergency Repair" means repair of a failing system where immediate ac-
tion is necessary to relieve a situation in which sewage is backing up into a
dwelling or building, or repair of a broken pressure sewer pipe. It does not
include the construction of new or additional absorption facilities, but would
allow use of the septic tank as a temporary holding tank until such time as
new or additional absorption facilities could be constructed pursuant to an
issued permit.
(55) "Equal Distribution" means the distribution of effluent to a set of disposal
trenches in which each trench receives effluent in equivalent or proportional
volumes.
(56) "Escarpment" means any naturally occurring slope greater than fifty (50)
percent which extends vertically six (6) feet or more as measured from toe to
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top, and which is characterized by a long cliff or steep slope which separates
two (2) or more comparatively level or gently sloping surfaces, and may
intercept one (1) or more layers that limit effective soil depth.
(57) "Evapotranspiration -Absorption (ETA) System" means an alternative
system consisting of a septic tank or other treatment facility, effluent sewer
and a disposal bed or disposal trenches, designed to distribute effluent for
evaporation, transpiration by plants, and by absorption into the underlying
soil.
(58) "Existing On -Site Sewage Disposal System" means any installed on-site
sewage disposal system constructed in conformance with the rules, laws and
local ordinances in effect at the time of construction, or which would have
conformed substantially with system design provided for in Commission,
State Board of Health or State Health Division rules.
(59) "Existing System" means "Existing On -Site Sewage Disposal System."
(60) "Failing System" means any system which discharges untreated or
incompletely treated sewage or septic tank effluent directly or indirectly onto
the ground surface or into public waters.
(61) "Family Member" means any one (1) of two (2) or more persons related by
blood or legally.
(62) "Filter Fabric" means a woven or spun -bonded sheet material used to
impede or prevent the movement of sand, silt and clay into drain media. A
specification for filter fabric is found in OAR 340-73-041.
(63) "Five -Day Biochemical Oxygen Demand (BODS)" means the quantity of
oxygen used in the biochemical oxidation of organic matter in five days at
twenty (20) degrees centigrade under specified conditions and reported as
milligrams per liter (mg/L).
(64) "Fragipan" means a loamy subsurface horizon with high bulk density
relative to the horizon above, seemingly cemented when dry, and weakly to
moderately brittle when moist. Fragipans are mottled and low in organic
matter. They impede movement of water, air, and growth of plant roots.
(65) "General Permit" means a permit issued to a category of qualifying
sources pursuant to OAR 340-45-033, in lieu of individual permits being
issued to each source.
(66) "Governmental Unit" means the state or any county, municipality, or
political subdivision, or any agency thereof.
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(67) "Grade" means the rate of fall or drop in inches per foot or percentage of
fall of a pipe.
(68) "Gray Water" means household sewage other than "black wastes", such as
bath water, kitchen waste water and laundry wastes.
(69) "Gray Water Waste Disposal Sump" means a receptacle or series of
receptacles designed to receive hand -carried gray water for disposal into the
soil.
(70) "Grease and Oils" means a component of sewage typically originating from
food stuffs, consisting of compounds of alcohol or glycerol with fatty acids.
(71) "Groundwater Interceptor" means any natural or artificial groundwater or
surface water drainage system including agricultural drain tile, cut banks,
and ditches which intercept and divert groundwater or surface water from the
area of the absorption facility.
(72) "Hardpan" means a hardened layer in soil caused by cementation of soil
particles with either silica, calcium carbonate, magnesium carbonate, or iron
and/or organic matter. The hardness does not change appreciably with
changes in moisture content. Hardpans impede movement of water and air
and growth of plant roots.
(73) "Header Pipe" means a tight jointed part of the sewage drainage conduit
which receives septic tank effluent from the distribution box, or drop box, or
effluent sewer and conveys it to the disposal area.
(74) "Headwall" means a steep slope at the head or upper end of a land slump
block or unstable landform.
(75) "Holding Tank" means a watertight receptacle designed to receive and
store sewage to facilitate disposal at another location.
(76) "Holding Tank System" means an alternative system consisting the com-
bination of a holding tank, service riser and level indicator (alarm), designed
to receive and store sewage for intermittent removal for disposal at another
location.
(77) "Hydrasplitter" means a hydraulic device to proportion flow under
pressure by the use of one or more orifices. Also may be referred to as a
Hydrosplitter.
(78) "Incinerator Toilet Facility" means "Combustion Toilet Facility"
(79) "Individual System" means a system that is not a community system.
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(80) "Individual Water Supply" means a source of water and a distribution
system which serves a residence or user for the purpose of supplying water
for drinking, culinary, or household uses and which is not a public water.
supply system.
(81) "Industrial Waste" means any liquid, gaseous, radioactive, or solid waste
substance or a combination thereof resulting from any process of industry,
manufacturing, trade, or business, or from the development or recovery of
any natural resources.
(82) "Intermittent Sand Filter" means a conventional sand filter.
(83) "Intermittent Stream" means any surface public water or groundwater
interceptor that continuously flows water for a period of greater than two
months in any one year, but not continuously for that year.
(84) "Invert" is the lowest portion of the internal cross section of a pipe or
fitting.
(85) "Large System" means any on-site system with a projected daily sewage
flow greater than two thousand five hundred (2,500) gallons.
(86) "Lateral Pipe" means "Distribution Pipe".
(87) "Mechanical Sewage Treatment Facility" means an aerobic sewage
treatment facility.
(88) "Medium Sand" means a mixture of sand with 100 percent passing the 3/8
inch sieve, 95 percent to 100 percent passing the No. 4 sieve, 80 percent to
100 percent passing the No. 8 sieve, 45 percent to 85 percent passing the
No. 16 sieve, 15 percent to 60 percent passing the No. 30 sieve, 3 percent
to 15 percent passing the No. 50 sieve, and 4 percent or less passing the No.
100 sieve.
(89) "Nonwater-Carried Waste Disposal Facility" means any toilet facility
which has no direct water connection, including pit privies, vault privies and
portable toilets.
(90) "Occupant" means any person living or sleeping in a dwelling.
(91) "On -Site Sewage Disposal System" means any existing or proposed on-site
sewage disposal system including, but not limited to a standard subsurface,
alternative, experimental or non -water carried sewage disposal system, in-
stalled or proposed to be installed on land of the owner of the system or on
other land as to which the owner of the system has the legal right to install
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the system. This does not include systems that are designed to treat and
dispose of Industrial Waste as defined in OAR Chapter 340, Division 45.
(92) "Operating Permit' means a WPCF permit issued pursuant to these rules.
(93) "Owner" means any person who alone, or jointly, or severally with others:
(a) Has legal title to any single lot, dwelling, dwelling unit, or
commercial facility; or
(b) Has care, charge, or control of any real property as agent, executor,
executrix, administrator, administratrix, trustee, commercial lessee, or
guardian of the estate of the holder of legal title; or
(c) Is the contract purchaser of real property.
NOTE: Each such person as described in subsections (b) and (c)
of this section, thus representing the legal title holder, is bound to
comply with the provisions of these rules as if he were the legal
title holder.
(94) "Permanent Groundwater Table" means the upper surface of a saturated
zone that exists year-round. The thickness of the saturated zone, and, as a
result, the elevation of the permanent groundwater table may fluctuate as
much as twenty (20) feet or more annually; but the saturated zone and as-
sociated permanent groundwater table will be present at some depth beneath
land surface throughout the year.
(95) "Permit' means the written document issued and signed by the Agent which
authorizes the permittee to install a system or any part thereof, which may
also require operation and maintenance of the system.
(96) "Person" includes individuals, corporations, associations, firms, partner-
ships, joint stock companies, public and municipal corporations, political
subdivisions, the state and any agencies thereof, and the federal government
and any agencies thereof.
(97) "Pollution" or `Water Pollution" means such alteration of the physical,
chemical or biological properties of any waters of the state, including change
in temperature, taste, color, turbidity, silt or odor of the waters, or such
discharge of any liquid, gaseous, solid, radioactive or other substance into
any waters of the state, which will or tends to, either by itself or in con-
nection with any other substance, create a public nuisance or which will or
tends to render such waters harmful, detrimental or injurious to public
health, safety or welfare, or to domestic, commercial, industrial, agri-
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cultural, recreational or other legitimate beneficial uses or to livestock,
wildlife, fish or other aquatic life or the habitat thereof.
(98) "Portable Toilet" means any self contained chemical toilet facility that is
housed within a portable toilet shelter and includes but is not limited to
construction type chemical toilets.
(99) "Portable Toilet Shelter" means any readily relocatable structure built to
house a toilet facility.
(100) "Pressure Distribution Lateral" means piping and fittings in pressure
distribution systems which distribute septic tank or other treatment unit
effluent to drain media through small diameter orifices.
(101) "Pressure Distribution Manifold" means piping and fittings in a pressure
distribution system which supply effluent from pressure transport piping to
pressure distribution laterals.
(102) "Pressure Distribution System" means any system designed to uniformly
distribute septic tank or other treatment unit effluent under pressure in an
absorption facility or sand filter.
(103) "Pressure Transport Piping" means piping which conveys sewage effluent
from a septic tank or other treatment or distribution unit by means of a pump
or siphon.
(104) "Pretreatment" means the wastewater treatment which takes place prior to
discharging to any component of an on-site sewage treatment and disposal
system, including but not limited to, pH adjustment, oil and grease removal,
BODS and TSS reduction, screening and detoxification.
(105) "Prior Approval" means a written approval for on-site sewage disposal, for
a specific lot, issued prior to January 1, 1974.
(106) "Prior Construction Permit" means a subsurface sewage disposal system
construction permit issued prior to January 1, 1974, by a county that had an
ordinance requiring construction permits for subsurface sewage disposal
systems.
(107) "Privy" means a structure used for disposal of human waste without the aid
of water. It consists of a shelter built above a pit or vault in the ground into
which human waste falls.
(108) "Projected Daily Sewage Flow" means the peak quantity of sewage a
facility is forecast to produce on a daily basis upon which system sizing and
design is based. It may be referred to as design flow. The Projected Daily
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Sewage Flow allows for a safety margin and reserve capacity for the system
during periods of heavy use.
(109) "Public Health Hazard" means a condition whereby there are sufficient
types and amounts of biological, chemical or physical, including radio-
logical, agents relating to water or sewage which are likely to cause human
illness, disorders or disability. These include, but are not limited to,
pathogenic viruses, bacteria, parasites, toxic chemicals, and radioactive
isotopes.
(110) "Public Waters" means lakes, bays, ponds, impounding reservoirs,
springs, wells, rivers, streams, creeks, estuaries, marshes, inlets, canals, the
Pacific Ocean within the territorial limits of the State of Oregon, and all
other bodies of surface or underground waters, natural or artificial, inland or
coastal, fresh or salt, public or private (except those private waters which do
not combine or effect a junction with natural surface or underground wa-
ters), which are wholly or partially within or bordering the state or within its
jurisdiction.
(111) "Recirculating Gravel Filter (RGF)" means a type of gravel filter
wastewater treatment system which utilizes an effluent recycle system where
a portion of the filtered effluent is mixed with septic tank effluent in a
recirculation/dilution tank and redistributed to the filter, in conformance with
these rules.
(112) "Recirculating Gravel Filter System" means a Recirculating Gravel Filter
and a absorption facility used to treat and dispose of sewage.
(113) "Redundant Disposal Field System" means a system in which two com-
plete disposal systems are installed, the disposal trenches of each system
alternate with each other and only one system operates at a given time.
(114) "Repair" means installation of all portions of a system necessary to
eliminate a public health hazard or pollution of public waters created by a
failing system. Major repair is defined as the replacement of the soil
absorption system. Minor repair is defined as the replacement of a septic
tank, broken pipe, or any part of the on-site sewage disposal system except
the soil absorption system.
(115) "Residential Strength Wastewater" means the primary sewage effluent
from a septic tank which does not exceed the following parameters:
Biochemical Oxygen Demand (BOD) of 300 mg/L; Total Suspended Solids
(TSS) of 150 mg/L; Total Kjeldahl Nitrogen (TKN) of 150 mg/L; and Oil &
Grease of 25 mg/L. Other contaminants may also be present in the waste-
water, however, they shall not exceed the concentrations or quantities
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program -
normally found in residential sewage. Effluent parameters are to be
measured using approved Standard Method or EPA procedures.
(116) "Sand Filter Media" means a medium sand or other approved material
used in a conventional sand filter. The media shall be durable and inert so
that it will maintain its integrity and not collapse or disintegrate with time
and shall not be detrimental to the performance of the system.
(117) "Sand Filter Surface Area" means the area of the level plane section in the
medium sand horizon of a conventional sand filter located two (2) feet below
the bottom of the drain media containing the pressurized distribution piping.
(118) "Sand Filter System" means the combination of septic tank or other treat-
ment unit, dosing system with effluent pump and controls, or dosing siphon,
piping and fittings, sand filter, and absorption facility used to treat and
dispose of sewage.
(119) "Sanitary Drainage System" means that part of the system of drainage
piping that conveys untreated sewage from a building or structure to a septic
tank or other treatment facility, service lateral at the curb or in the street or
alley, or other disposal terminal holding human or domestic sewage. The
sanitary drainage system consists of a building drain or building drain and
building sewer.
(120) "Saprolite" means weathered material underlying the soil that grades from
soft thoroughly decomposed rock to rock that has been weathered sufficiently
so that it can be broken in the hands or cut with a knife. It does not include
hard bedrock or hard fractured bedrock. It has rock structure instead of soil
structure.
(121) "Saturated Zone" means a three (3) dimensional layer, lens, or other sec-
tion of the subsurface in which all open spaces including joints, fractures,
interstitial voids, pores, etc. are filled with groundwater. The thickness and
extent of a saturated zone may vary seasonally or periodically in response to
changes in the rate or amount of groundwater recharge or discharge.
(122) "Scum" means a mass of sewage solids floating at the surface of sewage
which is buoyed up by entrained gas, grease, or other substances.
(123) "Seepage Area" means "Effective Seepage Area"
(124) "Seepage Bed" means an absorption system having disposal trenches wider
than three (3) feet.
(125) "Seepage Pit" means a "cesspool" which has a treatment facility such as a
septic tank ahead of it.
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(126) "Seepage Trench System" means a system with disposal trenches with
more than six (6) inches of drain media below the distribution pipe.
(127) "Self -Contained Nonwater-Carried Waste Disposal Facility" includes, but
is not limited to, vault privies, chemical toilets, combustion toilets, recir-
culating toilets, and portable toilets, in which all waste is contained in a
watertight receptacle.
(128) "Septage" means the domestic liquid and solid sewage pumped from septic
tanks, cesspools, holding tanks, vault toilets, chemical toilets or other
similar domestic sewage treatment components or systems and other sewage
sludge not derived at sewage treatment plants.
(129) "Septic Tank" means a watertight receptacle which receives sewage from a
sanitary drainage system, is designed to separate solids from liquids, digest
organic matter during a period of detention, and allow the liquids to dis-
charge to a second treatment unit or to a soil absorption facility. (See OAR
340-73-025 and 340-73-030).
(130) "Septic Tank Effluent" means partially treated sewage which is
discharged from a septic tank.
(131) "Serial Distribution" means the distribution of effluent to a set of disposal
trenches constructed at different elevations in which one (1) trench at a time
receives effluent in consecutive order beginning with the uppermost trench,
by means of a Drop Box, a serial overflow or other approved distribution
unit. The effluent in an individual trench must reach a level of two (2)
inches above the distribution pipe before effluent is distributed to the next
lower trench.
(132) "Sewage" means water -carried human and animal wastes, including
kitchen, bath, and laundry wastes from residences, buildings, industrial
establishments, or other places, together with such groundwater infiltration,
surface waters, or industrial waste as may be present.
(133) "Sewage Disposal Service" means:
(a) The construction of on-site sewage disposal systems (including the
placement of portable toilets), or any part thereof; or
(b) The pumping out or cleaning of on-site sewage disposal systems
(including portable toilets), or any part thereof; or
(c) The disposal of material derived from the pumping out or cleaning of
on-site sewage disposal systems (including portable toilets); or
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality B q9n t
(d) Grading, excavating, and earth -moving work connected with the
operations described in subsection (a) of this section .
(134) "Sewage Stabilization Pond" means a pond designed to receive the raw
sewage flow from a dwelling or other building and retain that flow for
treatment without discharge.
(135) "Slope" means the rate of fall or drop in feet per one hundred (100) feet of
the ground surface. It is expressed as percent of grade.
(136) "Soil Permeability Rating" refers to that quality of the soil that enables it
to transmit water or air, as outlined in the United States Department of
Agriculture Handbook, Number 18, entitled Soil Survey Manual.
(137) "Soil Separate" means the size of soil particles according to Table 7.
(138) "Soil Texture" means the amount of each soil separate in a soil mixture.
Field methods for judging the texture of a soil consist of forming a cast of
soil, both dry and moist, in the hand and pressing a ball of moist soil
between thumb and finger.
(a) The major textural classifications are defined as follows. (See Table
6):
SSRULEA (04-01-95)
(A) Sand: Individual grains can be seen and felt readily. Squeezed
in the hand when dry, this soil will fall apart when the pressure
is released. Squeezed when moist, it will form a cast that will
hold its shape when the pressure is released, but will crumble
when touched;
(B) Loamy Sand: Consists primarily of sand, but has enough silt
and clay to make it somewhat cohesive. The individual sand
grains can readily be seen and felt. Squeezed when dry, the soil
will form a cast which will readily fall apart, but if squeezed
when moist, a cast can be formed that will withstand careful
handling without breaking;
(C) Sandy Loam: Consists largely of sand, but has enough silt and
clay present to give it a small amount of stability. Individual
sand grains can be readily seen and felt. Squeezed in the hand
when dry, this soil will readily fall apart when the pressure is
released. Squeezed when moist, it forms a cast that will not
only hold its shape when the pressure is released, but will
withstand careful handling without breaking. The stability of
the moist cast differentiates this soil from sand;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(D) Loam: Consists of an even mixture of the different sizes of
sand and of silt and clay. It is easily crumbled when dry and
has a slightly gritty, yet fairly smooth feel. It is slightly plastic.
Squeezed in the hand when dry, it will form a cast that will
withstand careful handling. The cast formed of moist soil can
be handled freely without breaking;
(E) Silt Loam: Consists of a moderate amount of fine grades of
sand, a small amount of clay, and a large quantity of silt
particles. Lumps in a dry, undisturbed state appear quite
cloddy, but they can be pulverized readily; the soil then feels
soft and floury. When wet, silt loam runs together in puddles.
Either dry or moist, casts can be handled freely without break-
ing. When a ball of moist soil is passing between thumb and
finger, it will not press out into a smooth, unbroken ribbon, but
will have a broken appearance;
(F) Clay Loam: Consists of an even mixture of sand, silt, and
clay, which breaks into clods or lumps when dry. When a ball
of moist soil is pressed between the thumb and finger, it will
form a thin ribbon that will readily break, barely sustaining its
own weight. The moist soil is plastic and will form a cast that
will withstand considerable handling;
(G) Silty Clay Loam: Consists of a moderate amount of clay, a
large amount of silt, and a small amount of sand. It breaks into
moderately hard clods or lumps when dry. When moist, a thin
ribbon or one-eighth (1/8) inch wire can be formed between
thumb and finger that will sustain its weight and will withstand
gentle movement;
(H) Silty Clay: Consists of even amounts of silt and clay and very
small amounts of sand. It breaks into hard clods or lumps when
dry. When moist, a thin ribbon or one-eighth (1/8) inch or less
sized wire formed between thumb and finger will withstand
considerable movement and deformation;
(I) Clay: Consists of large amounts of clay and moderate to small
amounts of sand. It breaks into very hard clods or lumps when
dry. When moist, a thin, long ribbon or one -sixteenth (1/16)
inch wire can be molded with ease. Fingerprints will show on
the soil, and a dull to bright polish is made on the soil by a
shovel.
(b) These and other soil textural characteristics are also defined as shown
in the United States Department of Agriculture Textural Classification
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DEPARTMENT OF ENVIRONMENTAL QUALITY
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Water Quality Program
Chart which is hereby adopted as part of these rules. This textural
classification chart is based on the Standard Pipette Analysis as defined
in the United States Department of Agriculture, Soil Conservation Service
Soil Survey Investigations Report No. 1. (See Table 6).
(139) "Soil With Rapid or Very Rapid Permeability" means:
(a) Soil which contains thirty-five (35) percent or more of coarse
fragments two (2) millimeters in diameter or larger by volume with
interstitial soil of sandy loam texture or coarser as defined in
subsection (138)(a) of this rule and as classified in Soil Textural
Classification Chart, Table 6; or
(b) Coarse textured soil (loamy sand or sand as defined in section (138)
of this rule and as classified in Soil Textural Classification Chart,
Table 6); or
(c) Stones, cobbles, gravel, and rock fragments with too little soil
material to fill interstices larger than one (1) millimeter in diameter.
(140) "Split Waste Method" means a procedure where "black waste" sewage
and "gray water" sewage from the same dwelling or building are disposed
of by separate systems.
(141) "Stabilized Dune" means a sand dune that is similar to an active dune
except vegetative growth is dense enough to prevent blowing of sand. The
surface horizon is either covered by a mat of decomposed and partially
decomposed leaves, needles, roots, twigs, moss, etc., or to a depth of at
least six (6) inches contains roots and has a color value of three (3) or less.
(142) "Standard Subsurface System" means an on-site sewage disposal system
consisting of a septic tank, distribution unit and absorption facility
constructed in_ accordance with OAR 340-71-220, using six (6) inches of
drain media below the distribution pipe, and maintaining not less than eight
(8) feet of undisturbed earth between disposal trenches.
(143) "Steep Slope System" means a seepage trench system installed on slopes
greater than thirty (30) percent and less than or equal to forty-five (45)
percent, pursuant to these rules.
(144) "Subsurface Sewage Disposal" means the physical, chemical or bacterio-
logical breakdown and aerobic treatment of sewage in the unsaturated zone
of the soil above any temporarily perched groundwater body.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(145) "Subsurface Disposal System" means a cesspool or the combination of a
septic tank or other treatment unit and effluent sewer and absorption facility.
(146) "Surface Waters" means public waters, but excludes underground waters
and wells.
(147) "System" means "On -Site Sewage Disposal System"
(148) "Temporary Groundwater Table" means the upper surface of a saturated
zone that exists only on a seasonal or periodic basis. Like a permanent
groundwater table, the elevation of a temporary groundwater table may
fluctuate. However, a temporary groundwater table and associated saturated
zone will dissipate (dry up) for a period of time each year.
(149) "Test Pit" means an open pit dug to sufficient size and depth to permit
thorough examination of the soil to evaluate its suitability for subsurface
sewage disposal.
(I 5a) "Tile Dewatering System" means an alternative system in which the ab-
sorption facility is encompassed with field collection drainage tile, the
purpose of which is to reduce and control a groundwater table to create a
zone of aeration below the bottom of the absorption facility.
(151) "Toilet Facility" means a fixture housed within a toilet room or shelter for
the purpose of receiving black waste.
(152) "Total Kjeldahl Nitrogen (TKN)" means the combination of ammonia and
organic nitrogen but does not include nitrate and nitrite nitrogen.
(153) "Total Suspended Solids" (TSS) means solids in sewage that can be re-
moved readily by standard filtering procedures in a laboratory and reported
as milligrams per liter (mg/L).
(154) "Treatment" means the alteration of the quality of wastewaters by physical,
chemical or biological means or combination thereof such that tendency of
said wastes to cause degradation in water quality, risk to public health or
degradation of environmental conditions is reduced.
(155) "Underdrain Media" means that material placed under the sand filter
media in a sand filter. It shall be clean, washed pea gravel with 100 percent
passing the 1/2 inch sieve, 18 to 100 percent passing the 1/4 inch sieve, 5 to
75 percent passing the No. 4 sieve, 24 percent or less passing the No. 10
sieve, 2 percent or less passing the No. 16 sieve, and 1 percent or less
passing the No. 100 sieve.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Q"Ufy Program
(156) "Unstable Landforms" means areas showing evidence of mass downslope
movement such as debris flow, landslides, rockfall, and hummock hill slopes
with undrained depressions upslope. Unstable landforms may exhibit slip
surfaces roughly parallel to the hillside; landslide scars and curving debris
ridges; fences, trees, and telephone poles which appear tilted; or tree trunks
which bend uniformly as they enter the ground. Active sand dunes are
unstable landforms.
(157) "Vertisols" means a mineral soil characterized by a high content of
swelling -type clays which in dry seasons, causes the soils to develop deep
wide cracks.
(158) "WPCF Permit" means a Water Pollution Control Facilities Permit which
has been issued pursuant to OAR Chapter 340, Division 14 and OAR 340-
71-162.
(159) "Wastewater" means Sewage.
(160) "Zone of Aeration" means the unsaturated zone that occurs below the
ground surface and above the point at which the upper limit of the water
table exists.
340-71-110 PURPOSE.
These rules, adopted pursuant to ORS 454.625 and ORS 468.020 , prescribe the requirements
for the construction, alteration, repair, operation, and maintenance of on-site sewage disposal
systems. Their purpose is to restore and maintain the quality of public waters and to protect the
public health and general welfare of the people of the State of Oregon.
340-71-115 TECHNICAL REVIEW COMMITTEE.
The Director shall form an on-site sewage disposal Technical Review Committee (TRC) to assist
the Department in implementing the on-site sewage program.
(1) Purpose. The purpose of the TRC shall be:
(a) To advise and assist the Department in implementing the on-site
sewage program, including rule implementation problems and the need
for changes in the program and rules;
(b) To review and advise the Department on the use of new or innovative
technologies, materials or designs that maintain or advance protection
of the quality of public waters of the State and the public health and
general welfare. The TRC may utilize performance standards and cri-
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0145-1443
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
teria as appropriate to evaluate the efficiency and safety of new
technologies, materials or designs.
(2) Committee Composition and Term. The TRC shall consist of nine (9) per-
sons who shall be appointed by and serve at the pleasure of the Director.
They shall be appointed for three (3) year staggered terms. The TRC may
include on-site sewage disposal experts from local government, DEQ,
equipment manufacturers, consultants, installers and pumpers, and other
appropriate persons or groups.
(3) Meeting Frequency. The TRC shall meet as necessary, but at least two
times per year. The Department shall reimburse members for reasonable
expenses in accordance with Department policy.
(4) Chair. The Chair of the TRC shall be appointed by the Director for a term
determined by the Director.
(5) Staffing. The Department shall provide the necessary technical, engineering
and clerical staff and services in order for the TRC to fulfill its responsi-
bilities in a timely, professional, informed and responsible manner.
340-71-120 JURISDICTION AND POLICY.
(1) Oregon Revised Statutes (ORS) 454.725 authorizes the Department to enter
into agreements with local governmental units for those units to perform the
duties of the Department and become the Department's Agent in the per-
mitting of on-site sewage disposal systems, including receiving and
processing applications, issuing permits and performing required inspections
for all on-site systems. The Department shall assume those responsibilities
in nonagreement counties. The division of responsibilities is set forth as
follows:
(a) Systems conforming with the treatment and disposal criteria described
in this division, and which are not required to have a WPCF Permit
shall have site evaluations, plan reviews, permits and inspections
conducted or processed by the Agent, unless otherwise allowed within
this division;
(b) All systems required to have a WPCF Permit shall be regulated by the
Department. OAR 340-71-130(15) and (16) describe those systems
which must be constructed and operated by WPCF Permit. The
WPCF permitting process is described in OAR 340-71-162. The
Department may issue General Permits for some of the categories
requiring WPCF Permits. The Department may, through inter-
SSRULEA (04-01-95) 71-20 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
governmental agreements, delegate to the Agent site evaluations,
construction inspections, receipt of registration applications and
distribution of the Department's General Permit, and periodic
compliance inspections. Although the Agent may solicit voluntary
compliance with the Department's General Permit, ultimate enforce-
ment responsibility shall remain with the Department. The agreement
shall establish a level of compensation to be paid for the services
provided.
(2) Each and every owner of real property is jointly and severally responsible
for:
(a) Disposing of sewage on that property in conformance with the rules of
the Department; and
(b) Connecting all plumbing fixtures on that property, from which sewage
is or may be discharged, to a sewerage facility or on-site sewage
disposal system approved by the Department; and
(c) Maintaining, repairing, and/or replacing the system as necessary to
assure proper operation of the system.
(3) Agreement counties may, by ordinance, adopt requirements for operation
and maintenance of systems within that county. Such requirements must be
approved by the Director.
(4) The Department may, on its own or through agreements with local govern-
ments, conduct a pilot program (not to exceed two (2) years), utilizing
private contractors. To the extent consistent with ORS Chapter 454, and
other applicable statutes, the pilot program may allow private contractors to
perform the technical review necessary for the issuance of on-site sewage
disposal installation permits, Certificates of Satisfactory Completion or other
related on-site activities. In all instances, the private contractors technical
review shall be submitted to the Agent for the Agent's review and acceptance
or denial. The private contractors must comply with state registration acts
which may require registration for people performing these activities. The
Department or Agent may consider the enforcement history and criminal
record of a person proposing to enter into an agreement under this Section.
At the end of the pilot program the Department shall report to the
Commission with its findings and recommendations. After the Departments
report, the Commission may extend the pilot program for any duration, but
shall provide for periodic review of the program.
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0145=1445
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program,
340-71-130 GENERAL STANDARDS, PROHIBITIONS, AND REQUIREMENTS.
(1) Public Waters or Public Health Hazards. If, in the judgment of the Agent,
proposed operation of a system would cause pollution of public waters or
create a public health hazard, system installation or use shall not be
authorized. If, in the judgement of the Agent, the minimum standards
contained in these rules do not afford adequate protection of public waters or
public health, the requirements shall be more stringent. This may include,
but is not limited to, increasing setbacks, increasing drainfield sizing and, or
utilizing an Alternative System. If the Agent imposes requirements more
stringent than the minimum, the Agent shall provide the applicant with a
written statement of the specific reasons why the requirements are necessary.
(2) Approved Disposal Required. All sewage shall be treated and disposed of
in a manner approved by the Department. After review by the Technical
Review Committee and by the Department, the Director may approve use of
new or innovative technologies, materials, or designs that differ from those
specified within this division and OAR Chapter 340, Division 73, if such
technologies, materials, or designs provide equivalent or better protection of
the public health and safety and waters of the State and meet the purposes of
this division and OAR Chapter 340, Division 73, including the purposes
stated in OAR 340-71-110. The Department may determine that the
appropriate method of approving Alternative Systems is by rule amendment.
(3) Discharge of Sewage Prohibited. Discharge of untreated or partially
treated sewage or septic tank effluent directly or indirectly onto the ground
surface or into public waters constitutes a public health hazard and is pro-
hibited.
(4) Discharges Prohibited. No cooling water, air conditioning water, water
softener brine, groundwater, oil, hazardous materials, roof drainage, or
other aqueous or non -aqueous substances which are, in the judgement of the
Department, detrimental to the performance of the system or to groundwater,
shall be discharged into any system.
(5) Increased Flows Prohibited. Except where specifically allowed within this
division, no person shall connect a dwelling or commercial facility to a
system if the total projected sewage flow would be greater than that allowed
under the original system construction permit.
(6) System Capacity. Each system shall have adequate capacity to properly
treat and dispose of the maximum projected daily sewage flow. The quantity
of sewage shall be determined from Table 2 or other information the Agent
determines to be valid that may show different flows.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(7) Material Standards. All materials used in on-site systems shall comply
with standards set forth in these rules.
(8) Encumbrances. A permit to install a new system can be issued only if each
site has received an approved site evaluation (OAR 340-71-150) and is free
of encumbrances (i.e., easements, deed restrictions, etc.) which could pre-
vent the installation or operation of the system from being in conformance
with the rules of this division.
(9) Future Connection to Sewerage System. In areas where a district has been
formed to provide sewerage facilities, placement of house plumbing to
facilitate connection to the sewerage system shall be encouraged.
(10) Plumbing Fixtures Shall be Connected. All plumbing fixtures in dwellings
and commercial facilities from which sewage is or may be discharged, shall
be connected to, and shall discharge into an approved area -wide sewerage
system, or an approved on-site system which is not failing.
(11) Property Line Crossed:
(a) A recorded utility easement and covenant against conflicting uses, on a
form approved by the Department, is required whenever a system
crosses a property line separating properties under different owner
ship. The easement must accommodate that part of the system, includ-
ing setbacks, which lies beyond the property line, and must allow
entry to install, maintain and repair the system;
(b) Whenever an on-site system is located on one lot or parcel and the
facility it serves is on another lot or parcel under the same ownership,
the owner shall execute and record in the county land title records, on
a form approved by the Department, an easement and a covenant in
favor of the State of Oregon:
SSRULEA (04-01-95)
(A) Allowing its officers, agents, employees and representatives to
enter and inspect, including by excavation, that portion of the
system, including setbacks, on the other lot or parcel; and
(B) Agreeing not to put that portion of the other lot or parcel to a
conflicting use; and
(C) Agreeing that upon severance of the lots or parcels, to grant or
reserve and record a utility easement, in a form approved by the
Department, in favor of the owner of the lot or parcel served by
the system.
71-23
On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-144'7
Water Quality Program
(12) Disposal and Replacement Area. Except as provided in specific rules, the
disposal area, including installed system and replacement area shall not be
subject to activity that would, in the opinion of the Agent, adversely affect
the soil or the functioning of the system. This may include, but is not
limited to, vehicular traffic, covering the area with asphalt or concrete,
filling, cutting, or other soil modification.
(13) Operation and Maintenance. All systems shall be operated and maintained
so as not to create a public health hazard or cause water pollution. Those
facilities specified in sections (15) or (16) of this rule as requiring a WPCF
permit shall have operation and maintenance requirements established in the
permit.
(14) Construction. The Department or Agent may limit the time period a system
can be constructed due to soil conditions, weather, groundwater, or other
conditions which could affect the reliability of the system.
(15) Operating Permit Requirements. The following systems shall be con-
structed and operated under a renewable WPCF permit, issued pursuant to
OAR 340-71-162:
(a) Any system with a projected daily sewage flow greater than 2,500
gallons;
(b) A system of any size, if the sewage produced is greater than
residential strength waste water;
(c) Holding tanks;
NOTE: This requirement does not apply to septic tanks
used as temporary holding tanks pursuant to OAR 340-71-
160(11).
(d) A system, which includes a conventional sand filter as part of the
treatment process, that serves a commercial facility;
(e) A system which includes an aerobic treatment facility as part of the
treatment process if:
(A) The system serves a commercial facility; or
(B) The system does not meet the requirements of OAR 340-71-220
and 340-71-345.
(f) Recirculating Gravel Filters (RGFs);
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(g) Other systems that are not described in this division, that do not
discharge to surface public waters.
(16) WPCF Permits for Existing Facilities. Owners of existing systems, other
than owners of holding tanks, which these rules otherwise require to be
constructed and operated under a WPCF permit, are not required to apply
for a WPCF permit until such time as a system repair, correction, alteration,
or expansion is necessary. All owners of existing holding tanks which
require a WPCF permit under this rule shall make application for a WPCF
permit within twelve (12) months of the effective date of these rules.
(17) Perpetual Surety Bond Requirements. Pursuant to Oregon Revised
Statutes (ORS) 454.425 and OAR Chapter 340, Division 15, a perpetual
surety bond, or approved alternate security, in the amount of $1.00 per
gallon per day installed sewage disposal capacity, shall be filed with the
Department by any person proposing to construct or operate facilities for the
collection, treatment, or disposal of sewage with a design capacity of 5,000
gallons per day or more.
(a) Exemptions From the Surety Bond Requirements:
(A) Systems serving only food handling establishments, travel trailer
accommodations, tourist and travelers facilities, or other
development operated by a public entity or under license issued
by the State Health Division. (Systems which serve both
licensed facilities and unlicensed facilities require a surety bond
if the portion requiring a Health Division license has a design
capacity of 5,000 gallons per day or more);
(B) Systems owned and operated by a state or federal agency, city,
county service district, sanitary authority, sanitary district, or
other public body;
(C) Systems serving the sewerage needs of industrial or commercial
operations where there are no permanent residences.
(b) Alternate Security: The approved forms of alternate security are
specified in OAR 340-15-020.
(18) Fees for WPCF Permits. The fees required to be filed with WPCF permit
applications and to be paid annually for WPCF permit compliance de-
termination are outlined in OAR 340-71-140(6).
(19) Variances for WPCF Permits. The variance procedures established in this
division do not apply to systems permitted by WPCF Permit.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(20) Engineering Plan Review. Pursuant to ORS 46813.055, unless specifically
exempted by rule, all plans and specifications for the construction,
installation or modification of disposal systems, shall be submitted to the
Department for its approval or denial pursuant to rules of the Commission.
The design criteria and rules governing the plan review are as follows:
(a) For on-site systems which do not require a WPCF permit, the rules
and design criteria for construction are found in this division.
Construction standards for certain manufactured items are found in
OAR Chapter 340, Division 73;
(b) For on-site systems which require a WPCF permit, the criteria in this
division shall be used. However, the Department may allow variations
of the criteria and/or technologies, when the applicant or Department
has adequate documentation of successful operation of that technology
or design. The burden of proof for demonstrating new processes,
treatment systems, and technologies that the Department is unfamiliar
with, lies with the system designer. The Department shall review all
plans and specifications for WPCF permits pursuant to procedures and
requirements outlined in OAR Chapter 340, Division 52.
(21) Manufacturer's Specifications. All materials and equipment, including but
not limited to tanks, pipe, fittings, solvents, pumps, controls, valves, etc.
shall be installed, constructed, operated, and maintained in accordance with
manufacturer's minimum specifications.
(22) Sewer and Water Lines. Effluent sewer and water line piping which is
constructed of materials which are approved for use within a building, as
defined by the current Oregon State Plumbing Specialty Code, may be run in
the same trench. Where the effluent sewer pipe is of material not approved
for use in a building, it shall not be run or laid in the same trench as water
pipe unless both of the following conditions are met:
(a) The bottom of the water pipe at all points shall be set at least 12
inches above the top of the sewer pipe;
(b) The water pipe shall be placed on a solid shelf excavated at one side
of the common trench with a minimum clear horizontal distance of at
least 12 inches from the sewer pipe.
(23) Septage Disposal. No person shall dispose of sewage, septage (septic tank
pumpings) , or sewage contaminated materials in any location not
authorized by the Department under applicable laws and rules for such
disposal.
SSRULEA (04-01-95) 71-26 On -Site Disposal
k,�
a 0145-1450
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(24) Groundwater Levels. All groundwater levels shall be predicted using
"Conditions Associated With Saturation" as defined in OAR 340-71-100. If
conditions associated with saturation do not occur in soil with rapid or very
rapid permeability, predictions of the highest level of the water table shall be
based on past recorded observations of the Agent. If such observations have
not been made, or are inconclusive, the application shall be denied until
observations can be made. Groundwater level determinations shall be made
during the period of the year in which high groundwater normally occurs in
that area.
340-71-140 FEES — GENERAL.
(1) Except as provided in section (5) of this rule, the following non-refundable
fees are required to accompany applications for site evaluations, permits,
licenses and services provided by the Department.
ON-SITE MAXIMUM
SEWAGE DISPOSAL SYSTEMS FEE
(a) New Site Evaluation:
SSRULEA (04-01-95)
(A) Single Family Dwelling:
(i) First Lot .................. $ 380;
(ii) Each Additional Lot Evaluated During
Initial Visit ................ $ 205;
(B) Commercial Facility System:
(i) For First One Thousand (1,000) Gallons
Projected Daily Sewage Flow ..... $ 380;
(ii) For systems with projected sewage flows greater than one
thousand (1,000) gallons but not more than 5,000 gallons,
the site evaluation application fee shall be $380 plus an
additional $100 for each 500 gallons or part thereof above
1,000 gallons.
(C) Site Evaluation Report Review ........ $ 335;
(D) Fees for site evaluation applications made to an agreement
county shall be in accordance with that county's fee schedule;.
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On -Site Disposal
0145-1451;
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(E) Each fee paid for a site evaluation report entitles the applicant to
as many site inspections on a single parcel or lot as are
necessary to determine site suitability for a single system. The
applicant may request additional site inspections within ninety
(90) days of the initial site evaluation, at no extra cost;
(F) Separate fees shall be required if site inspections are to
determine site suitability for more than one (1) system on a
single parcel of land.
(b) Construction -Installation Permit:
(A) For First One Thousand (1,000) Gallons Projected Daily
Sewage Flow:
(i) Standard On -Site System ........ $ 565;
(ii) Alternative System:
(I)
Aerobic System .........
$
565;
(II)
Capping Fill ...........
$
860;
(III)
Cesspool .............
$
565;
(IV)
Disposal Trenches in
Saprolite .............
$
565;
(V)
Evapotranspiration -
Absorption ............
$
565;
(VI)
Gray Water Waste Disposal
Sump ................
$
240;
(VII)
Pressure Distribution. .....
$
860;
(VIII)
Redundant ............
$
565;
(IX)
Sand Filter . ...........
$ 1,100;
(X)
Seepage Pit . ...........
$
565;
(XI)
Seepage Trench. ........
$
565;
(XII)
Steep Slope ............
$
565;
(XIII)
Tile Dewatering .........
$
860;
(iii) At the discretion of the Agent, the permittee may be
assessed a reinspection fee, not to exceed $200, when a
precover inspection correction notice requires correction
of improper construction and, at a subsequent inspection,
the Agent finds system construction deficiencies have not
been corrected. The Agent may elect not to make further
precover inspections until the reinspection fee is paid;
SSRULEA (04-01-95) 1 71-28 On -Site Disposal
01451452
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(iv) With the exceptions of sand filter and pressure dis-
tribution systems, a $25 fee may be added to all permits
that specify the use of a pump or dosing siphon.
(B) For systems with projected daily sewage flows greater than one
thousand (1,000) gallons, the Construction -Installation permit
fee shall be equal to the fee required in paragraph (1)(b)(A) of
this rule plus $50 for each five hundred (500) gallons or part
thereof above one thousand (1,000) gallons;
NOTE: Fees for construction permits for systems with
projected daily sewage flows greater than two thousand five
hundred (2,500) gallons shall be in accordance with the fee
schedule for WPCF permits.
(C) Commercial Facility System, Plan Review:
(i) For a system with a projected daily sewage
flow of less than six hundred (600) gallons,
the cost of plan review is included in the
permit application fee;
i
(ii) For a system with a projected daily sewage
flow of six hundred (600) gallons, but not
more than one thousand (1,000) gallons
projected daily sewage flow ...... $ 200;
(iii) For a system with a projected sewage flow greater than
1,000 gallons, the plan review fee shall be $200, plus an
additional $25 for each five hundred (500) gallons or part
thereof above one thousand (1,000) gallons, to a maxi-
mum sewage flow limit of two thousand five hundred
(2,500) gallons per day;
(D) Permit Renewal:
(i) If Field Visit Required.......... $ 290;
(ii) No Field Visit Required ........ $ 85;
NOTE: Renewal of a permit may be granted to the
original permittee if an application for permit renewal is
filed prior to the original permit expiration date. Refer to
OAR 340-71-160(10).
(E) Alteration Permit . ................ $ 555;
SSRULEA (04-01-95) 1 71-29 On -Site Disposal
0145-1453
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
SSRULEA (04-01-95) 71-30 On -Site Disposal
(F) Repair Permit:
(i) Single Family Dwelling:
(I) Major . ................
$ 310;
(11) Minor .................
$ 150;
(ii) Commercial Facility:
(I) Major — The appropriate fees identified in
paragraphs (1)(b)(A), (B), and (C)
of this rule apply;
(II) Minor . ................
$ 280.
(G) Permit Denial Review ..............
$ 335.
(c)
Authorization Notice:
(A) If Field Visit Required ..............
$ 350;
(B) No Field Visit Required ..............
$ 90;
(C) Authorization Notice Denial Review ....
$ 335;
(d)
Annual Evaluation of Alternative System
(Where Required) ...................
$ 280;
(e)
Evaluation of Temporary or Hardship
Mobile Home ...................
$ 280;
(f)
Variance to On -Site System Rules ..........
$ 225;
NOTE: The variance application fee may be waived if the applicant
meets the requirements of OAR 340-71-415(5).
(g)
Rural Area Variance to Standard Subsurface Rules:
(A) Site Evaluation ..................
$ 380;
NOTE: In the event there is on file a site
evaluation report for that parcel that is less
than ninety (90) days old, the site evaluation
fee shall be waived.
SSRULEA (04-01-95) 71-30 On -Site Disposal
U145zl454
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Construction -Installation Permit — The appropriate fee
identified in subsection (1)(b) of this rule applies.
(h) Sewage Disposal Service:
(A) New Business License ............. $ 300;
(B) Renewal of Existing and Valid Business
License ....................... $ 200;
(C) Transfer of or Amendments
to License ..................... $ 150;
(D) Reinstatement of Suspended License ..... $ 175;
(E) Pumper Truck Inspection, First Vehicle:
(i) Each Inspection .............. $ 100;
(ii) Each Additional Vehicle, Each
Inspection ................. $ 50;
(i) Experimental Systems: Permit ............ $ 5,000;
(j) Existing System Evaluation Report ......... $ 350.
NOTE: The fee shall not be charged for an evaluation report
on any proposed repair, alteration or extension of an existing system.
(2) Contract County Fee Schedules. Pursuant to ORS 454.745(4), fee
schedules which exceed the maximum fees in ORS 454.745(1) and
section (1) of this rule shall be established by rule.
(3) Contract County Fee Schedules, General:
(a) Each county having an agreement with the Department under ORS
454.725 shall adopt a fee schedule for services rendered and permits
to be issued. The county fee schedule shall not include the
Department's surcharge fee identified in section 4 of this rule;
(b) A copy of the fee schedule and any subsequent amendments to the
schedule shall be forwarded to the Department;
(c) Fees shall not:
SSRULEA (04-01-95)
(A) Exceed actual costs for efficiently conducted services;
71-31
On -Site Disposal
0145-1455
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Exceed the maximum fee established in section (1) of this rule,
unless approved by the Commission pursuant to ORS
454.745(4).
(4) Surcharge. In order to offset a portion of the administrative and program
oversight costs of the statewide on-site sewage disposal program, a surcharge
of $35 for each site evaluated, for each construction installation permit and
all other activities for which an application is submitted, shall be levied by
the Department and by each Agreement County. Proceeds from surcharges
collected by the Department and Agreement Counties shall be accounted for
separately. Each Agreement County shall forward the proceeds to the De-
partment as negotiated in the memorandum of agreement (contract) between
the county and the Department.
(5) Refunds. The Agent may refund all or a portion of a fee accompanying an
application if the applicant withdraws the application before the Agent has
done any field work or other substantial review of the application.
(6) Fees for WPCF Permits. The following fee schedule shall apply to WPCF
Permits for on-site sewage disposal systems issued pursuant to OAR 340-71-
162:
(a) Application filing fee (all categories) ........ $ 50;
(b) Permit processing fees for sewage lagoons and
other on-site disposal systems over 1,200 gpd:
(A) New Applications ................ $ 2,000;
(B) Permit Renewals (including request for
effluent limit modifications) .......... $ 1,000;
(C) Permit Renewal (without request for
effluent limit modifications) .......... $ 500;
(D) Permit modification (involving increase in
effluent limits) .................. $ 1,000;
(E) Permit modification (not involving an increase
in effluent limits) ................ $ 500;
(c) Permit processing fees for on-site systems of
1,200 gpd or less:
(A) New Applications ................ $ 400;
SSRULEA (04-01-95) 71-32 On -Site Disposal
. 045-1456
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qadio Program
(B) Permit Renewals (involving request for effluent
limit modifications . ............... $ 200;
(C) Permit Renewals (without request for effluent
limit modifications) ............... $ 100;
(D) Permit Modifications (involving increase in
effluent limitations) ................ $ 150;
(E) Permit Modifications (not involving an increase
in effluent limits) ................. $ 100;
(d) Registration fee for General Permits ......... $ 150;
(e) Site Evaluation Fee:
(A) Facilities with design flow of 5,000 gpd or
less ........ same as section (1)(a) of this rule;
(B) Facilities with design flow greater than
5,000 gpd ................... $ 1,200;
(f) Site Evaluation Confirmation Fee .......... $ 350;
NOTE: A Site Evaluation Confirmation Fee is required if the site
evaluation is performed by a qualified consultant but, through the site
evaluation review process, a site visit is still required by the
Department or Agent.
(g) Plan Review Fee:
(A) Commercial Facilities with design flows less than 5,000
gpd ..... same as paragraph (1)(b)(C) of this rule;
(B) Commercial Facilities with design flows of
5,000 gpd or more . ............... $ 500;
(C) Non-commercial Facilities. .......... $ 100;
NOTE: A plan review fee is required when engineered
plans must be reviewed for a facility which requires
a WPCF permit.
(h) Annual Compliance Determination Fee:
SSRULEA (04-01-95)
(A) On-site sewage lagoon with no discharge .. $ 600;
71-33 On -Site Disposal
0145-145`7
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) On-site subsurface systems with individual
WPCF Permit or general permit:
(i) Standard or alternative subsurface
system not listed below, with design
' flow of 20,000 gpd or more ...... $ 500;
(ii) Standard or alternative subsurface
system not listed below with design
flow less than 20,000 gpd ....... $ 250;
(iii) Aerobic systems, 1,500 gpd
or more ................... $ 500;
(iv)
Aerobic systems, less than 1,500 ...
$
250;
(v)
Recirculating Gravel Filter, 1,500
gpd or more ................
$
500;
(vi)
Recirculating Gravel Filter, less than
1,500 gpd .................
$
250;
(vii)
Sand Filter, 1,500 gpd or more.
$
500;
(viii)
Sand Filter, less than 1,500 gpd. ...
$
250;
(ix)
Holding tanks ...............
$
200.
NOTE: The annual compliance determination fee
(ACDF) is due July of each year. For permits which are
issued between July 1 and September 31, the full fee is
due before the permit will be issued. For permits issued
after September 31, the ACDF will be prorated by
calendar quarter.
SSRULEA (04-01-95) 71-34 On -Site Disposal
0145-1458
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-150 SITE EVALUATION PROCEDURES.
(1) A site evaluation is the first step in the process of obtaining a construction
permit for an on-site system. Except as otherwise allowed in these rules,
any person who wishes to install a new on-site sewage system shall first
obtain a site evaluation report.
(2) Applications for site evaluations shall be made to the Agent, on forms
approved by the Department. Each application must be completed in full,
signed by the owner or legally authorized representative, and be
accompanied by all required exhibits and appropriate fee. Incomplete
applications shall be returned to the applicant to be completed. Unless other
procedures approved by the Department are provided within a contract
county, applicants shall provide at least two (2) test pits with dimensions
and configuration as directed by the Agent, which are located approximately
seventy-five (75) feet apart and within the area of the proposed system ,
including the repair/replacement area .
(3) Site Evaluation Report:
(a) The Agent shall evaluate the site of the proposed system, shall
consider all system options, and shall provide a report of such
evaluation;
(b) The site evaluation report shall be on a form approved by the
Department;
(c) The report shall contain, at a minimum, a site diagram and
observations of the following site characteristics, if present:
(A) Parcel size;
(B) Slope — in disposal field and replacement areas (percent and
direction);
(C) Surface streams — springs — other bodies of water;
(D) Existing and proposed wells;
(E) Escarpments;
(F) Cuts and fills;
(G) Unstable landforms;
(H) Soil profiles — determined from test pits provided by applicant;
SSRULEA_ (04-01-95) 71-35 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
(I) Water table levels;
0145-1459
Water Quality Program
(J) Useable area for initial and replacement disposal areas;
(K) Encumbrances (applicant list on application);
(L) Sewerage availability;
(M) Other observations as appropriate.
(d) Site evaluation reports for subdivisions or other land divisions shall be
based upon an evaluation of each lot;
(e) Specific conditions or limitations imposed on an approved site shall be
listed on the evaluation report;
(f) An Agent approved site evaluation report assures that the property
owner will receive a permit to construct a system on that property
provided procedures and conditions for permit issuance found in OAR
340-71-160 are met.
(4) Approval or Denial:
(a) In order to obtain a favorable site evaluation report the following
conditions shall be met:
(A) All criteria for approval of a specific type or types of system, as
outlined in OAR 340, Division 71 shall be met;
(B) Each lot or parcel must have sufficient usable area available to
accommodate an initial and replacement system. The usable
area may be located within the lot or parcel, or within the
bounds of another lot or parcel if secured pursuant to OAR
340-71-130(11). Sites may be approved where the initial and
replacement systems would be of different types, e.g., a stan-
dard subsurface system as the initial system and an alternative
system as the replacement system. The site evaluation report
shall indicate the type of the initial and type of replacement
system for which the site is approved.
EXCEPTION: A replacement area is not required in areas un-
der control of a legal entity such as a city, county, or sanitary
district, provided the legal entity gives a written commitment
that sewerage service will be provided within five (5) years.
SSRULEA (04-01-95) 71-36 On -Site Disposal
0145-1460
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(b) A site evaluation shall be denied where the conditions identified in
subsection (4)(a) of this rule are not met;
(c) Technical rule changes shall not invalidate a favorable site evaluation,
but may require use of a different kind of system.
(5) Site Evaluation Report Review. A site evaluation report issued by the
Agent shall be reviewed at the request of the applicant. The application for
review shall be submitted to the Department in writing, within thirty (30)
days of the site evaluation report issue date, and be accompanied by the
review fee. The review shall be conducted and a report prepared by the
Department.
340-71-155 EXISTING SYSTEM EVALUATION REPORT.
(1) Any person, upon application, may request an evaluation report on an
existing on-site sewage disposal system. The application shall be on a form
provided by the Agent and approved by the Department.
(2) The application is complete only when the form, on its face, is completed in
full, signed by the owner or the owner's legally authorized representative,
and is accompanied by all necessary exhibits including the fee. A fee shall
not be charged for an evaluation report on any proposed repair, alteration or
extension of an existing system for which a permit application has been
made pursuant to OAR 340-71-160 .
(3) The Agent shall:
(a) Examine the records, if available, on the existing system; and
(b) Conduct a field evaluation of the existing system; and
(c) Issue a report of findings to the applicant.
340-71-160 PERMIT APPLICATION PROCEDURES — GENERAL REQUIREMENTS.
(1) No person shall cause or allow construction, alteration, or repair of a
system, or any part thereof, without first applying for and obtaining a
permit.
EXCEPTION: Emergency repairs as set forth in OAR 340-71-215.
(2) Applications for permits shall be made on forms approved by the
Department.
SSRULEA (04-01-95)
71-37
On -Site Disposal
A 0145 -1451
F,
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(3) An application is complete only when the form, on its face, is completed in
full, is signed by the owner or the owner's legally authorized representative,
and is accompanied by all required exhibits and fee. Except as otherwise
allowed in this division, the exhibits shall include:
(a) Favorable Site Evaluation Report. At the Agent's discretion, the
requirement for an evaluation report may be waived when the
application is for a repair permit or an alteration permit;
(b) A land use compatibility statement from the appropriate land use
authority signifying that the proposed land use is compatible with the
Land Conservation and Development Commission acknowledged com-
prehensive plan or complies with the statewide planning goals;
(c) Plans and specifications for the on-site system proposed for installation
within the area identified by the Agent or in the favorable site
evaluation report. The Agent shall determine and request the
minimum level of detail necessary to insure proper system
construction;
(d) Any other information the Agent finds is necessary to complete the
permit application.
(4) The application form shall be received by the Agent only when the form is
complete, as detailed in section (3) of this rule.
(5) Upon receipt of a completed application the Agent shall deny the permit if:
(a) The application contains false information;
(b) The application was wrongfully received by the Agent;
(c) The proposed system would not comply with these rules;
(d) The proposed system, if constructed, would violate a Commission
moratorium as described in OAR 340-71-460;
(e) The proposed system location is encumbered as described in OAR
340-71-130(8);
(f) A sewerage system which can serve the proposed sewage flow is both
legally and physically available, as described in paragraphs (A) and
(B) of this subsection :
SSRULEA (04-01-95) 71-38 On -Site Disposal
0145-1462
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(A) Physical Availability. A sewerage system shall be deemed
physically available if its nearest connection point from the
property to be served is:
(i) For a single family dwelling, or other establishment with
a maximum projected daily sewage flow of not more than
four hundred fifty (450) gallons, within three hundred
(300) feet;
(ii) For a proposed subdivision or group of two (2) to five (5)
single family dwellings, or equivalent projected daily
sewage flow, not further than two hundred (200) feet
multiplied by the number of dwellings or dwelling
equivalents;
(iii) For proposed subdivisions or other developments with
more than five (5) single family dwellings, or equivalents,
the Agent shall make a case-by-case determination of
sewerage availability.
EXCEPTION: A sewerage system shall not be con-
sidered available if topographic or man-made features
make connection physically impractical.
(B) Legal Availability. A sewerage system shall be deemed legally
available if the system is not under a Department connection
permit moratorium, and the sewerage system owner is willing or
obligated to provide sewer service.
(6) A permit shall be issued only to a person licensed under ORS 454.695, or to
the owner or easement holder of the land on which the system is to be in-
stalled.
(7) No person shall construct, alter or repair a system, or any part thereof,
unless that person is licensed under ORS 454.695, or is the permittee.
(8) The Agent shall either issue or deny the permit within twenty (20) days after
receipt of the completed application.
EXCEPTION: If weather conditions or distance and unavail-
ability of transportation prevent the Agent from acting to either
issue or deny the permit within twenty (20) days, the applicant
shall be notified in writing. The notification shall state the reason
for delay. The Agent shall either issue or deny the permit within
sixty (60) days after the mailing date of such notification.
SSRULEA (04-01-95) 71-39 On -Site Disposal
0145-1463 -
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(9) A permit issued pursuant to these rules shall be effective for one (1) year
from the date of issuance for construction of the system. The construction -
installation permit is not transferable. Once a system is installed pursuant to
the permit, and a Certificate of Satisfactory Completion has been issued for
the installation, conditions imposed as requirements for permit issuance shall
continue in force as long as the system is in use.
(10) Renewal of a permit may be granted to the original permittee if an applica-
tion for permit renewal is filed prior to the original permit expiration date.
Application for permit renewal shall conform to the requirements of sections
(2) and (4) of this rule. The permit shall be issued or denied consistent with
sections (5), (6), (8), and (9) of this rule.
(11) If a permit has been issued pursuant to these rules but existing soil moisture
conditions preclude the construction of the soil absorption system, the septic
tank may be installed and used as a temporary holding tank upon approval of
the Agent. Before the Agent will approve such use, the permittee shall
demonstrate that the outlet of the tank has been sealed with a water tight seal
and that the permittee or owner has entered into a pumping contract for the
tank. The maximum length of time a septic tank can be used as a temporary
holding tank is 12 months.
340-71-162 PERMIT APPLICATION PROCEDURES -- WPCF PERMITS
(1) Any person wishing to obtain a new, modified, or renewal WPCF permit
shall submit a written application on forms provided by the Department.
Applications must be submitted at least 60 days before a permit is needed.
All application forms must be completed in full, signed by the applicant or
the applicant's legally authorized representative , and accompanied by the
specified number of copies of all required exhibits. The name of the
applicant must be the legal name of the owner of the facilities, the owner's
agent, or the lessee responsible for the operation and maintenance. Some of
the required exhibits, but not necessarily all of them, which must accompany
the application are:
(a) A land use compatibility statement from the local land use planning
agency indicating that the site is approved for the activity for which
the applicant is applying (if the activity is approved only upon
condition of a conditional use permit, a copy of the issued conditional
use permit shall be one of exhibits);
(b)
A copy of a favorable site evaluation report indicating that the site is
approved for the type and quantity of wastes to be disposed;.
SSRULEA (04-01-95) 71-40 On -Site Disposal
01 *1464
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(c) Evidence that the permit processing fees and the first year's annual
compliance determination fee have been paid to the Department or
Agent, as directed;
(d) A site diagram meeting the requirements of OAR 340-71-160(3)(c).
(2) Applications which are obviously incomplete, unsigned, or which do not
contain the required exhibits will not be accepted by the Department for
filing and may be returned for completion.
(3) Within 15 days after filing, the Department will preliminarily review the
application to determine the adequacy of the information submitted:
(a) If the Department determines that additional information is needed, it
will promptly request the needed information from the applicant. The
application will not be considered complete for processing until the
requested information is received. The application will be considered
withdrawn if the applicant fails to submit the requested information
within 90 days of the request;
(b) If, in the opinion of the Department, additional measures are necessary
to gather facts regarding the application, the Department will notify
the applicant that said measures will be instituted, and the timetable
and procedures to be followed. The application will not be considered
complete for processing until the necessary additional fact finding
measures are completed. When the Department determines the infor-
mation in the application is adequate, the applicant shall be notified in
writing that the application is complete for processing.
(4) Following determination that the application is complete for processing, each
application will be reviewed on its own merits. Recommendations will be
developed in accordance with the provisions of all applicable statutes and
rules of the Commission.
(5) Draft Permit Review. If the Department makes a preliminary determination
to issue a permit, a permit will be drafted and sent to the applicant for
review. The applicant will have up to 14 calendar days to comment on the
draft permit.
(6) Public Participation. For on-site disposal systems with a design flow of
5,000 gallons per day or greater, a public notice of the pending Department
action shall be distributed to the interested public. If in the public interest,
at the discretion of the Department, a public notice may be distributed re-
garding pending Department actions on other on-site disposal systems re-
quiring WPCF permits. If a public notice is distributed, it shall be for a
period of at least 30 days. If, during the public notice period, the De-
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0145•-1455
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
partment receives written requests from ten persons, or from an organization
representing at least 10 persons, for a public hearing to allow interested
persons to appear and submit oral or written comments on the proposed
provisions, the Department shall provide such a hearing before taking final
action on the application, at a reasonable place and time and on reasonable
notice.
(7) Final Department Action. Within 45 days after closing of the public
comment period, the Department shall take final action on the permit
application. In making its final determination, the Department shall consider
the comments received and any other information obtained which may be
pertinent to the application being considered.
(8) Applicant's Appeal Rights. If the applicant is dissatisfied with the
conditions or limitations of the permit, the applicant may request a hearing
before the Commission or its authorized representative. Such a request for
hearing shall be made in writing to the Director within 20 days of the date of
mailing of the notification of final permit action. Any hearing held shall be
conducted pursuant to OAR Chapter 340, Division 11.
(9) Permit Term. A permit issued pursuant to this rule shall be for a period not
to exceed 5 years. The expiration date shall be recorded on each permit
issued. At least 90 days prior to the expiration of the permit, a permit
renewal application, on forms provided by the Department, shall be filed
with the Department to obtain renewal of the permit.
(10) For systems which are proposed to be or which are operating under a WPCF
permit, no person shall construct, alter or repair the absorption facility, or
any part thereof, unless that person is licensed under ORS 454.695, or is the
permittee.
(11) No person shall connect to or use any system authorized by a WPCF permit,
unless the system has been inspected and certified as per OAR Chapter 340,
Division 52, and that certification has been received and accepted by the
Department.
(12) Renewal of a Permit. The procedures for issuance of a permit shall apply
to renewal of a permit. If a completed application for renewal of a permit is
filed with the Department in a timely manner prior to expiration date of the
permit, the permit shall not be deemed to expire until final action has been
taken on the renewal application to issue or deny a permit.
(13) Permit Modification. In the event it becomes necessary for the Department
to institute modification of a permit due to changing conditions or standards,
receipt of additional information or any other reason pursuant to applicable
statutes, the Department shall notify the permittee by registered or certified
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DEPARTMENT OF ENVIRONMENTAL QUALITY
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Water Quality Program
mail of its intent. Such notification shall include the proposed modification
and reasons for modification. The modification shall become effective 20
days from the date of mailing of such notice unless within that time the
permittee requests a hearing before the Commission or its authorized
representative. Such a request for hearing shall be made in writing to the
Director and shall state the grounds for the request. Any hearing held shall
be conducted pursuant to OAR Chapter 340, Division 11.
(14) Permit Suspension or Revocation. In the event it becomes necessary for
the Department to suspend or revoke a permit due to non-compliance,
unapproved changes in operation., false information submitted in the
application, failure to pay fees, or to maintain the required surety bond or
equivalent security, the Department will notify the permittee by registered
or certified mail of its intent. Such notification shall include the reasons for
the suspension or revocation. The suspension or revocation shall become
effective 20 days from the date of mailing of such notice unless within that
time the permittee requests a hearing before the Commission or its
authorized representative or resolves the issue which would cause the permit
to be suspended. Any request for a hearing shall be in writing to the
Director and shall state the grounds for the request. Any hearing held shall
be conducted pursuant to OAR Chapter 340, Division 11.
(15) Transfer of a WPCF Permit. No WPCF permit shall be transferred to a
third party without prior written approval from the Department. Such
approval may be granted by the Department where the transferee acquires a
property interest in the permitted activity and agrees in writing to fully
comply with all the terms and conditions of the WPCF permit and the rules
of the Commission.
(16) General Permits.
(a) The Department may issue general permits for certain categories of
on-site sewage disposal systems where an individual WPCF permit is
not necessary in order to adequately protect public health and the
environment. Prior to issuing the general permit, the Department
shall follow the same public notice procedures found in section (6) of
this rule. In order to be covered by a general permit issued by the
Department, a person shall:
SSRULEA (04-01-95)
(A) Submit a registration application on a form provided by the
Department or Agent, along with the necessary attachments,
including but not limited to favorable site evaluation and land
use compatibility statement;
(B) Demonstrate that the on-site disposal facility fits into the
category of sources covered by the general permit;
71-43
On -Site Disposal
w
DEPARTMENT OF ENVIRONMENTAL QUALITY
(C) Submit applicable fees.
0145-1467
Water Quality Program
(b)' Any person covered by a general permit may request to be covered by
an individual WPCF, in lieu of the general permit, upon submission of
the required application and fees;
(c) The Department may revoke a general permit as it applies to any
person's on-site sewage disposal system and require such person to
apply for and obtain an individual WPCF permit, if:
(A) The covered source or activity is a significant contributor of
pollution or creates other environmental problems;
(B) The permittee is not in compliance with the terms and
conditions of the general permit; or
(C) Conditions or standards have changed so that the source or
activity no longer qualifies for a general permit.
(d) The Department's Agent may distribute and receive registration
applications for general permits for on-site sewage disposal systems
and may distribute general permits, if the procedure is established in
an agreement between the Department and the Agent.
(17) Rules Which Do Not Apply to WPCF Applicants or Permittees.
(a) Because the permit review, issuance, and appeal procedures for WPCF
permits are different from those of other on-site permits regulated by
these rules, the following portions within this division do not apply to
WPCF applicants or permittees: OAR 340-71-155; 340-71-160(6),
(8), (9), and (10); 340-71-165(1); 340-71-170; 340-71-175; 340-71-
185; 340-71-195; 340-71-200; 340-71-205; 340-71-210; 340-71-
215(1), (2), (3); 340-71-270; 340-71-275(4)(c)(A); 340-71-295(1);
340-71-305; 340-71-320; 340-71-325; 340-71-330; 340-71-345; 340-
71-360(2)(b)(B); 340-71-410; 340-71-415; 340-71-420; 340-71-425;
340-71-430; 340-71-435; 340-71-440; and 340-71-445;
(b) Permit applicants and permittees are not subject to any WPCF permit -
related fees other than those specifically contained within OAR 340-
71-140;
(c) The following portions of OAR Chapter 340, Division 73, do not
apply to WPCF applicants or permittees: OAR 340-73-030(1); 340-
73-065;340-73-070; and 340-73-075.
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DEPARTMENT OF ENVIRONMENTAL QUALITY
340-71-165 PERMIT DENIAL REVIEW.
0145-1468
Water Quality Program
(1) A permit denied by the Agent shall be reviewed at the request of the
applicant. The application for review shall be submitted to the Department
in writing, within thirty (30) days of the permit denial notice from the
Agent, and be accompanied by the denial review fee. The denial review
shall be conducted and a report prepared by the Department.
(2) Permit denials for systems proposed to serve a commercial facility, intended
to be used in a commercial activity, trade, occupation or profession, and all
systems covered by WPCF permit, may be appealed through the contested
case hearing procedure set forth in ORS 183 and OAR Chapter 340, Division
11.
(3) If the Agent intends to deny a permit for a parcel of ten (10) acres or larger
in size, the Agent shall:
(a) • Provide the applicant with a Notice of Intent to Deny;
(b) Specify reasons for the intended denial; and
(c) Offer a contested case hearing in accordance with ORS 183 and OAR
Chapter 340, Division 11.
340-71-170 PRE -COVER INSPECTIONS.
(1) When construction, alteration or repair of a system for which a permit has
been issued is complete, except for backfill (cover), or as required by
permit, the system installer shall notify the Agent. The Agent shall inspect
the installation to determine if it complies with the rules of the Commission,
unless the inspection is waived by the Agent in accordance with section (2)
of this rule or in accordance with the provisions of OAR 340-71-400(6).
(2) The Agent may, at the Agent's election, waive the pre -cover inspection
for a system proposed to serve a single family dwelling or for a system of
similar flow and waste strength, provided:
(a) The system was installed by a sewage disposal service licensed
pursuant to ORS 454.695; and
(b) The inspecting jurisdiction and the Department have developed an
impartial method of identifying those installers who have a history of
proper installations without excessive numbers of corrections; and
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DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1459
Water Quality Program
(c) Inspections waived are for installations made by installers identified as
having a good history of proper installation; and
(d) A representative number of each installer's systems has been
inspected, regardless of installation history; and
(e) The Agent may require the installer to submit to the Agent
photographs of those portions of the construction where the inspection
is waived.
(3) The system installer shall submit the following information to the Agent at
the time construction of the system is complete:
(a) A detailed and accurate as -built plan of the constructed system; and
(b) A list of all materials used in the construction of the system; and
(c) A written certification (on a form acceptable to the Department) that
the construction was in accordance with the permit and rules of the
Commission.
340-71-175 CERTIFICATE OF SATISFACTORY COMPLETION.
(1) The Agent shall issue a Certificate of Satisfactory Completion if, upon
inspection of installation, the system complies with the rules of the
Commission and the conditions of the permit.
(2) If inspected installation does not comply with the rules of the Commission
and the conditions of the permit, the permittee shall be notified in writing or
a Correction Notice shall be posted on the site. System deficiencies shall be
explained and satisfactory completion required. Follow-up inspections may
be waived by the Agent. After satisfactory completion a Certificate shall be
issued.
(3) If the inspection is not made within seven (7) days after notification of
completion, or if the inspection is waived in accordance with OAR 340-71-
170(2) or OAR 340-71-400(6), a Certificate of Satisfactory Completion shall
be deemed to have been issued by operation of law. In such cases, a
modified Certificate shall be issued to the owner.
(4) A system, once installed, shall be backfilled (covered) only when:
(a) The permittee is notified by the Agent that inspection has been
waived; or
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(b) The inspection has been conducted by the Agent and a Certificate of
Satisfactory Completion has been issued; or
(c) A Certificate of Satisfactory Completion has been issued by operation
of law where the inspection has not been conducted within seven (7)
days of notification of completed installation.
(5) Failure to meet requirements for satisfactory completion within thirty (30)
days after written notification or posting of a Correction Notice on the site,
constitutes a violation of ORS 454.605 to 454.745 and this division .
(6) No person shall connect to or use any system, completed on or after January
1, 1974, unless a Certificate of Satisfactory Completion has been issued for
the installation, or deemed issued by operation of law as provided in ORS
454.665(2).
(7) Unless otherwise required by the Agent the system installer shall backfill
(cover) a system within ten (10) days after issuance of a Certificate of
Satisfactory Completion for that system.
(8) A Certificate of Satisfactory Completion shall be valid for a period of five
(5) years , for connection of the system to the facility for which it was
constructed. After the five (5) year period, rules for Authorization Notices
or Alteration Permits apply, as outlined in OAR 340-71-205 and 340-71-210.
(9) Denial of a Certificate of Satisfactory Completion may be appealed in
accordance with ORS 183.310 and OAR Chapter 340, Division 11.
OAR 340-71-185 DECOMMISSIONING OF SYSTEMS.
(1) The owner shall decommission a system when:
(a) A sewerage system becomes available and the building sewer has been
connected thereto; or
(b) The source of sewage has been permanently eliminated; or
(c) The system has been operated in violation of OAR 340-71-130(13),
unless and until a repair permit and Certificate of Satisfactory
Completion are subsequently issued therefor; or
(d) The system has been constructed, installed, altered, or repaired
without a required permit authorizing same, unless and until a permit
is subsequently issued therefor; or
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DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1471:
Water Quality Program
(e) The system has been operated or used without a required Certificate of
Satisfactory Completion or Authorization Notice authorizing same, un-
less and until a Certificate of Satisfactory Completion or Authorization
Notice is subsequently issued therefor.
(2) Procedures for Decommissioning:
(a) The tank(s), cesspool or seepage pit shall be pumped by a licensed
sewage disposal service to remove all septage;
(b) The tank(s), cesspool or seepage pit shall be filled with reject sand,
bar run gravel, or other material approved by the Agent, or the
container shall. be removed and properly disposed;
(3) If, in the judgment of the Agent, it is not reasonably possible or necessary to
comply with subsections (2)(a) and (2)(b) of this rule, the Agent may waive
either or both of these requirements provided such action does not constitute
a menace to public health, welfare or safety.
340-71-195 UPGRADING DISPOSAL SYSTEMS.
When upgrading systems which approximate a pit privy and gray water discharge to the surface
or to a pit, system repair rules (340-71-215) shall apply, provided:
(1) The system serves an occupied dwelling; and
(2) The system and dwelling were constructed prior to January 1, 1974.
340-71-200 PRIOR CONSTRUCTION PERMITS OR APPROVALS.
(1) All construction permits and written approvals issued prior to January 1,
1974, expired by rule of the Commission on July 1, 1976, unless they met all
requirements of OAR 340-71-015(8) and were converted to Department
construction permits prior to that date.
(2) Converted permits required system construction prior to July 1, 1980. Any
prior approvals or prior permits failing to meet the two (2) deadline dates
above are void.
(3) All sites now proposed for on-site systems must meet appropriate require-
ments of these rules.
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DEPARTMENT OF ENVIRONMENTAL QUALITY
340-71-205 AUTHORIZATION TO USE EXISTING SYSTEMS.
0145-1472 ow.
Water Quality Program
(1) Authorization Notice Required. Except as otherwise allowed in this division
no person shall place into service, change the use of, or increase the
projected daily sewage flow into an existing on-site sewage disposal system
without first obtaining an Authorization Notice, Construction -Installation
Permit or Alteration Permit as appropriate.
EXCEPTIONS:
-1- An Authorization Notice is not required when a mobile home is
replaced with similar mobile home in a mobile home park, or a
recreation vehicle is replaced by another recreation vehicle in a lawful
recreation vehicle park, provided the sanitary wastewater system has
adequate capacity for safe treatment and disposal of sewage generated
within the park;
-2- An Authorization Notice is not required for placing into service a
previously unused system for which a Certificate of Satisfactory
Completion has been issued within five (5) years of the date such
system is placed into service, providing the projected daily sewage
flow does not exceed the design flow, and there is no other violation
of these rules.
(2) An application for the Authorization Notice shall be submitted on a form
approved by the Department. The application is complete only when the
form, on its face, is completed in full, is signed by the owner or the owner's
legally authorized representative, and is accompanied by all required exhibits
and fee. The exhibits shall include:
(a) A land use compatibility statement from the appropriate land use
authority signifying that the proposed land use is compatible with the
Land Conservation and Development Commission acknowledged com-
prehensive plan or complies with the statewide planning goals;
(b) An accurate property development plan;
(c) A sewage treatment and disposal system description;
(d) Tax lot map or equivalent plat map for the property;
(e) Documentation of hardship if such is being claimed;
(f) All other information the Agent finds is necessary to complete the
application.
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0145=24'73
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(3) For placing into service or for changes in the use of an existing on-site
sewage disposal system where no increase in sewage flow is projected, or
where the design flow is not exceeded; an Authorization Notice valid for a
period not to exceed one (1) year may be issued if:
(a) The existing system is not failing; and
(b) All set -backs between the existing system and the structure can be
maintained; and
(c) In the opinion of the Agent the proposed use would not create a public
health hazard on the ground surface or in surface public waters.
(4) For placing into service, or for changing the use of a system where
projected daily sewage flow would be increased by not more than three
hundred (300) gallons beyond the design capacity or by not more than fifty
(50) percent of the design capacity for the system, whichever is less; an
Authorization Notice valid for a period not to exceed one (1) year may be
issued if:
(a) The existing system is shown not to be failing; and
(b) All set -backs between the existing system and the structure can be
maintained; and
(c) Sufficient area exists so that a complete replacement area meeting all
requirements of these rules (except those portions relating to soil
conditions and groundwater) is available; and
(d) In the opinion of the Agent the proposed increase would not create a
public health hazard or water pollution.
(5) Only one (1) Authorization Notice for an increase of up to three hundred
(300) gallons beyond the design capacity, or increase of not more than fifty
(50) percent of the design capacity, whichever is less, will be allowed per
system.
(6) For placing into service, or for changing the use of a system where projected
daily sewage flows would be increased by more than three hundred 300)
gallons beyond the design capacity, or increased by more than fifty (50)
percent of the design capacity of the system, whichever is less, a Construc-
tion -Installation Permit shall be obtained. The permit application procedure
described in OAR 340-71-160 shall be followed.
(7) Personal Hardship:
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DEPARTMENT OF ENVIRONMENTAL QUALITY
0145--1474
Water Quality Prngram
(a) The Agent may allow a mobile home to use an existing system serving
another dwelling, in order to provide housing for a person suffering
hardship, or for an individual providing care for such a person, by
issuing an Authorization Notice, if:
(A) The Agent receives satisfactory evidence which indicates that a
person is suffering physical or mental impairment, infirmity, or
is otherwise disabled (a hardship approval issued under local
planning ordinances shall be accepted as satisfactory evidence);
and
(B) The system is not failing; and
(C) The application is for a mobile home; and
(D) Evidence is provided that a hardship mobile home placement is
allowed on the subject property by the governmental agency that
regulates zoning, land use planning, and/or building.
(b) The Authorization Notice shall remain in effect for a specified period
not to exceed 5 years, but shall not exceed cessation of the hardship.
The Authorization Notice may be extended for additional periods by
submitting an application in accordance with the requirements in sec-
tion (2) of this rule. The Agent shall impose conditions in the
Authorization Notice which are necessary to assure protection of
public health.
(8) Temporary Placement:
(a) The Agent may allow a mobile home to use an existing system serving
another dwelling in order to provide temporary housing for a family
member in need, and may issue an Authorization Notice provided:
(A) The Agent receives evidence that the family member is in need
of temporary housing; and
(B) The system is not failing; and
(C) A full system replacement area is available; and
(D) Evidence is provided that a temporary mobile home placement is
allowed on the subject property by the governmental agency that
regulates zoning, land use planning, and/or building.
(b) The Authorization Notice shall authorize use for no more than two (2)
years and is not renewable. The Agent shall impose conditions in the
SSRULEA (04-01-95) 71-51 On -Site Disposal
f,
0145-14'75
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
Authorization Notice necessary to assure protection of public health.
If the system fails during the temporary placement` and additional
replacement area is no longer available, the mobile home shall be
removed from the property.
(9) If the conditions of sections (3), (4), (6), (7) and (8) of this rule cannot be
met, the Agent shall either deny the Authorization Notice or shall not issue it
until such time as necessary alterations and/or repairs to the system are
made. The fee submitted as part of the Authorization Notice application
shall be credited towards the fee for the appropriate permit. If the ap-
propriate permit fee is higher than the fee already paid, the owner shall pay
the difference. The Agent may require submittal of the exhibits described in
OAR 340-71-160(3) to complete the application, and shall issue or deny the
appropriate permit consistent with sections (5), (6), (8), and (9) of that rule.
(10) An Authorization Notice denied by the Agent shall be reviewed by the De-
partment at the request of the applicant. The application for review shall be
submitted to the Department in writing within forty-five (45) days of the
authorization notice denial, and be accompanied by the denial review fee
and other information the Department finds is necessary to complete the
application . The denial review shall be conducted and a report prepared by
the Department.
340-71-210 ALTERATION OF EXISTING ON-SITE SEWAGE DISPOSAL SYSTEMS.
(1) Permit Required. No person shall alter or increase the design capacity of an
existing on-site sewage disposal system without first obtaining an Alteration
Permit or Construction -Installation Permit, as appropriate. The permit
application procedure is described in OAR 340-71-160.
(2) An application for an Alteration Permit shall be submitted to the Agent for
proposed alterations to an existing system. The permit may be issued if the
provisions of either subsections (a) or (b) of this section are met:
(a)
Alterations that do not increase the system's design capacity beyond
the original design flow:
(A) The existing system is not failing; and
(B) The site setbacks in Table 1 can be met except; If the setbacks
in Table 1 for septic tanks, treatment units, effluent sewer and
distribution units cannot be met, the Agent may allow a
reasonable installation; and
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Oi 45 ol476
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(C) In the opinion of the Agent, use of the on-site system would not
create a public health hazard or water pollution.
(b) Alterations that do not exceed the existing system's design capacity by
more than three hundred (300) gallons per day or fifty (50) percent,
whichever is less:
(A) The existing system is not failing; and
(B) The setbacks in Table 1 can be met; and
(C) In the opinion of the Agent, use of the on-site system would not
create a public health hazard or water pollution.
(3) An application for a Construction -Installation Permit shall be submitted to
the Agent when the existing system's design capacity is proposed to be
exceeded by greater than three hundred (300) gallons per day or greater than
fifty (50) percent, whichever is less. The permit application procedure
described in OAR 340-71-160 shall be followed.
(4) Certificate of Satisfactory Completion Required. Upon completion of
installation of that part of a system for which a permit has been issued, the
system installer shall comply with the requirements for pre -cover inspec-
tions, as described in OAR 340-71-170. The Agent shall issue or deny the
Certificate of Satisfactory Completion for the completed construction
pursuant to OAR 340-71-175. An increase in the projected daily sewage
flow into the system is prohibited until the Certificate is issued.
340-71-215 REPAIR OF EXISTING SYSTEMS.
(1) A failing system shall be immediately repaired.
EXCEPTION: If in the opinion of the Agent adverse soil con-
ditions exist due to climatic conditions that would likely preclude
a successful repair, the Agent may allow a delay in commencing
repairs until the soil conditions improve. If this exception is
exercised, a compliance date shall be specified in a Notice of
Violation to the system owner.
(2) No person shall repair a failing system without first obtaining a Repair
Permit. The permit application procedure is described in OAR 340-71-160.
EXCEPTION: Emergency repairs may be made without first ob-
taining a permit provided that a repair permit application is sub-
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
mitted to the Agent within three (3) working days after the emer-
gency repairs are begun.
(3) Certificate of Satisfactory Completion. Upon completion of installation of
that part of a system for which a repair permit has been issued, the system
installer shall comply with the requirements for pre -cover inspections, as
described in OAR 340-71-170. The Agent shall issue or deny the
Certificate of Satisfactory Completion pursuant to OAR 340-71-175.
(4) Criteria for Permit Issuance:
(a) If the site characteristics and standards described in OAR 340-71-220
can be met, then the repair installation shall conform with them;
(b) If the site characteristics or standards described in OAR 340-71-220
cannot be met, the Agent may allow a reasonable repair installation in
order to eliminate a public health hazard. Reasonable repairs may
require the installation of an alternative system in order to eliminate a
public health hazard.
(5) Failing systems which cannot be repaired shall be decommissioned in ac-
cordance with OAR 340-71-185.
340-71-220 STANDARD SUBSURFACE SYSTEMS.
(1) Criteria For Standard Subsurface System Approval. In order to be
approved for a standard subsurface system each site must meet all the
following conditions:
(a) Effective soil depth shall extend thirty (30) inches or more from the
ground surface as shown in Table 3. A minimum six (6) inch
separation shall be maintained between the layer that limits effective
soil depth and the bottom of the absorption facility.
(b) Water table levels shall be predicted using Standards in OAR 340-71-
130(24) .
(A) A permanent water table shall be four (4) feet or more from the
bottom of the absorption facility.
EXCEPTION: In defined geographic areas where the De-
partment has determined through a groundwater study that
degradation of groundwater would not be caused nor
public health hazards created. In the event this exception
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31
0145-1478
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
is allowed, the rule pertaining to a temporary water table
shall apply.
(B) A temporary water table shall be twenty-four (24) inches or
more below the ground surface. An absorption facility shall not
be installed deeper than the level of the temporary water table;
(C) Groundwater Interceptors. A groundwater interceptor may be
used to intercept and/or drain temporary water from a disposal
area; however, it may be required to demonstrate that the site
can be de -watered prior to issuing a Construction -Installation
permit. Groundwater interceptors may be used only on sites
with adequate slope to permit proper drainage. Unless
otherwise authorized by the Agent, each outlet shall be
protected by a short section of Schedule 40 PVC or ABS plastic
pipe and a grill to exclude rodents. Where required, ground-
water interceptors are an integral part of the system, but do not
need to meet setback requirements to property lines, wells,
streams, lakes, ponds or other surface waterbodies which are
required of the sewage disposal area.
(c) Soil with rapid or very rapid permeability shall be thirty six (36)
inches or more below the ground surface. A minimum eighteen (18)
inch separation shall be maintained between soil with rapid or very
rapid permeability and the bottom of disposal trenches.
SSRULEA (04-01-95)
EXCEPTION: Sites may be approved with no separation
between the bottom of disposal trenches and soil as defined
in OAR 340-71-100 (139) (a) and (b), with rapid or very
rapid permeability, and disposal trenches may be placed
into soil as defined in OAR 340-71-100 (139) (a) and (b),
with rapid or very rapid permeability if any of the
following conditions occur:
-1- A confining layer occurs between the bottom of disposal
trenches and the groundwater table. A minimum six (6) inch
separation shall be maintained between the bottom of disposal
trenches and the top of the confining layer; or
-2- A layer of non -gravelly (less than 15% gravel) soil with sandy
loam texture or finer at least eighteen (18) inches thick occurs
between the bottom of the disposal trenches and the groundwater
table; or
-3- The projected daily sewage flow does not exceed a loading rate
of four hundred fifty (450) gallons per acre per day.
71-55
On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-14'79
Water Quality Program
(d) Slopes shall not exceed thirty (30) percent and the slope/depth
relationship set forth in Table 3;
(e) The site has not been filled or the soil has not been modified in a way
that would, in the opinion of the Agent, adversely affect functioning of
the system;
(f) The site shall not be on an unstable land form, where operation of the
system may be adversely affected;
(g) The site of the initial and replacement absorption facility shall not be
covered by asphalt or concrete, or subject to vehicular traffic,
livestock, or other activity which would adversely affect the soil;
(h) The site of the initial and replacement absorption facility will not be
subjected to excessive saturation due to, but not limited to, artificial
drainage of ground surfaces, driveways, roads, and roof drains;
(i) Setbacks in Table 1 can be met:
(A) Surface Waters Setbacks. Setback from streams or other
surface waters shall be measured from bank drop-off or mean
yearly highwater mark, whichever provides the greatest
separation distance;
(B) Lots Created Prior to May 1, 1973. For lots or parcels legally
created prior to May 1, 1973, the Agent may approve installa-
tion of a standard or alternative system with a setback from
surface public waters of less than one hundred (100) feet but not
less than fifty (50) feet, provided all other provisions of these
rules can be met;
(C) . Water Lines and Sewer Lines Cross. Where water lines and
building or effluent sewer lines cross, separation distances shall
be as required in the State Plumbing Code;
(D) Septic Tank Setbacks. The Agent shall encourage the placement
of septic tanks and other treatment units as close as feasible to
the minimum separation from the building foundation in order to
minimize clogging of the building sewer.
(2) Criteria For System Sizing: Disposal Fields. Disposal fields shall be
designed and sized on the basis of:
(a) Table 2, Quantities of Sewage Flows; or other information
determined by the Agent to be reliable.
SSRULEA (04-01-95) 71-56 On -Site Disposal
0145--1480
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qualify Nov=
EXCEPTIONS: Systems shall be sized on the basis of
three hundred (300) gallons sewage flow per day, plus
seventy-five (75) gallons per day for the third bedroom
when:
-1- Systems are proposed to serve single family dwellings on lots
of record that were created prior to March 1, 1978, which are
inadequate in size to accommodate a system sized for a daily
sewage flow of four hundred fifty (450) gallons.
-2- Systems for specifically planned developments, with living units
of three (3) or fewer bedrooms, where deed restrictions prohibit
an increase in the number of bedrooms.
(b) Table 4, Minimum Length of Disposal Trench Required, Soil Texture
Versus Effective Soil Depth;
(c) Table 5, Minimum Length of Disposal Trench Required, Soil
Texture Versus Depth to Temporary Water;
(d) Strength of the Wastewater. Where the strength of the wastewater
exceeds the maximum limits for "Residential Strength Wastewater",
as defined in OAR 340-71-100, and/or the contents of the wastewater
are atypical of the same or are foreseen as a threat to groundwater,
public health, or the environment, the wastewater shall first receive
pre-treatment to reduce the factor(s) to acceptable levels, before it can
be discharged into a standard or alternative treatment and disposal
system. Any system which requires pre-treatment requires a WPCF
permit for construction and operation.
(3) Septic Tanks:
(a) Liquid Capacity:
(A) Septic tanks for commercial facilities shall have a liquid
capacity of at least two (2) times the projected daily sewage
flow, unless otherwise authorized by the Agent or Department;
but in no case shall capacity be less than 1,000 gallons;
(B) Additional volume may be required by the Agent for special or
unique waste characteristics, including but not limited to flow
patterns, volumes, waste strength, or facility operation;
(C) The quantity of daily sewage flow shall be estimated from Table
2. For structures not listed in Table 2, the Agent shall deter-
mine the projected daily sewage flow;
SSRULEA (04-01-95) 71-57 On -Site Disposal
F U145-141
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(D) Single Family. Dwelling. A septic tank to serve a single family
dwelling shall be sized on the number of bedrooms in the
dwelling. For a dwelling with 4 or fewer bedrooms, the tank
capacity shall be at least 1,000 gallons. A 1,500 gallon (or
larger) septic tank shall be required when the dwelling has more
than 4 bedrooms.
(b) Installation Requirements:
(A) Septic tanks shall be installed on a level, stable base that will
not settle;
(B) Septic tanks located in high groundwater areas shall be weighted
or provided with an antibuoyancy device to prevent flotation;
(C) All septic tanks shall be installed with a watertight manhole
riser extending to the ground surface or above. The riser shall
have a minimum nominal diameter of 20 inches. A cover shall
be provided and securely fastened or weighted to prevent easy
removal. Septic tanks with a soil cover depth of more than 36
inches or having a capacity bf more than 3,000 gallons shall
have at least one manhole riser which is 30 inches in diameter
or more;
(D) Septic tanks shall be installed in a location that provides access
for servicing and pumping;
(E) Where practicable, the sewage flow from any establishment
shall be consolidated into one septic tank.
(F) At the discretion of the Agent, a removable plug may be placed
in the top of the septic tank's inlet sanitary tee if the septic tank
discharges directly into a gravity -fed absorption facility;
(G) All tanks shall be tested for water tightness in accordance with
OAR 340-73-025.
(H) The outlet of all septic tanks serving commercial facilities shall
be equipped with an effluent filter meeting the requirements of
Rule 73-056, complete with a service riser for the filter which
meets all the requirements of OAR 340-71-220(3)(b)(C).
(c) Construction. Septic tank construction shall comply with minimum
standards set forth in OAR Chapter 340, Division 73, unless otherwise
authorized in writing by the Department.
SSRULEA (04-01-95) 71-58 On -Site Disposal
nFPARTMENT OF ENVIRONMENTAL QUALITY
0145-1482
Water Quality Program
(D) Single Family Dwelling. A septic tank to serve a single family
dwelling shall be sized on the number of bedrooms in the
dwelling. For a dwelling with 4 or fewer bedrooms, the tank
capacity shall be at least 1,000 gallons. A 1,500 gallon (or
larger) septic tank shall be required when the dwelling has more
than 4 bedrooms.
(b) Installation Requirements:
(A) Septic tanks shall be installed on a level, stable base that will
not settle;
(B) Septic tanks located in high groundwater areas shall be weighted
or provided with an antibuoyancy device to prevent flotation;
(C) All septic tanks shall be installed with a watertight manhole
riser extending to the ground surface or above. The riser shall
have a minimum nominal diameter of 20 inches. A cover shall
be provided and securely fastened or weighted to prevent easy
removal. Septic tanks with a soil cover depth of more than 36
inches or having a capacity of more than 3,000 gallons shall
have at least one manhole riser which is 30 inches in diameter
or more;
(D) Septic tanks shall be installed in a location that provides access
for servicing and pumping;
(E) Where practicable, the sewage flow from any establishment
shall be consolidated into one septic tank.
(F) At the discretion of the Agent, a removable plug may be placed
in the top of the septic tank's inlet sanitary tee if the septic tank
discharges directly into a gravity -fed absorption facility;
(G) All tanks shall be tested for water tightness in accordance with
OAR 340-73-025.
(H) The outlet of all septic tanks serving commercial facilities shall
be equipped with an effluent filter meeting the requirements of
Rule 73-056, complete with a service riser for the filter which
meets all the requirements of OAR 340-71-220(3)(b)(C).
(c) Construction. Septic tank construction shall comply with minimum
standards set forth in OAR Chapter 340, Division 73, unless otherwise
authorized in writing by the Department.
SSRULEA (04-01-95) 71-58 On -Site Disposa[
t
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1483
Water Quality Program
EXCEPTIONS: Systems shall be sized on the basis of
three hundred (300) gallons sewage flow per day, plus
seventy-five (75) gallons per day for the third bedroom
when:
-1- Systems are proposed to serve single family dwellings on lots
of record that were created prior to March 1, 1978, which are
inadequate in size to accommodate a system sized for a daily
sewage flow of four hundred fifty (450) gallons.
-2- Systems for specifically planned developments, with living units
of three (3) or fewer bedrooms, where deed restrictions prohibit
an increase in the number of bedrooms.
(b) Table 4, Minimum Length of Disposal Trench Required, Soil Texture
Versus Effective Soil Depth;
(c) Table 5, Minimum Length of Disposal Trench Required, Soil
Texture Versus Depth to Temporary Water;
(d) Strength of the Wastewater. Where the strength of the wastewater
exceeds the maximum limits for "Residential Strength Wastewater",
'as defined in OAR 340-71-100, and/or the contents of the wastewater.
are atypical of the same or are foreseen as a threat to groundwater,
public health, or the environment, the wastewater shall first receive
pre-treatment to reduce the factor(s) to acceptable levels, before it can
be discharged into a standard or alternative treatment and disposal
system. Any system which requires pre-treatment requires a WPCF
permit for construction and operation.
(3) Septic Tanks:
(a) Liquid Capacity:
(A) Septic tanks for commercial facilities shall have a liquid
capacity of at least two (2) times the projected daily sewage
flow, unless otherwise authorized by the Agent or Department;
but in no case shall capacity be less than 1,000 gallons;
(B) Additional volume may be required by the Agent for special or
unique waste characteristics, including but not limited to flow
patterns, volumes, waste strength, or facility operation;
(C) The quantity of daily sewage flow shall be estimated from Table
2. For structures not listed in Table 2, the Agent shall deter-
mine the projected daily sewage flow;
SSRULEA (04-01-95) 71-57 On -Site Disposal
0145-1484
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(d) Double Compartment. Where a septic tank is preceded by a sewage
ejector pump, the tank shall be constructed as a two (2) com-
partmentalized tank. The first compartment shall be not less than two
thirds the required tank capacity. All other requirements of these
rules apply. An effluent filter shall be installed on the outlet of the
tank.
(4) Distribution Techniques. Disposal trenches shall be constructed according to
one of the following methods:
(a) Gravity Fed Equal Distribution (including Loop) .
(A) Equal distribution shall be used on generally level ground. All
trenches and piping shall be level within a tolerance of plus or
minus one (1) inch. All lateral piping shall be at the same
elevation;
(B) A pressure operated hydrosplitter may be used to achieve equal
distribution;
(C) To determine the total useable area of a looped soil absorption
facility, the Agent shall take the sum of the lengths of the
parallel disposal trenches plus the lengths of a maximum of two
(2) disposal trenches intersecting the parallel trenches.
(b) Serial Distribution. Serial distribution is generally used on sloping
ground. Each trench shall be level within a tolerance of plus or minus
one (1) inch. Serial distribution may be a combination of equal
distribution and serial distribution;
(c) Pressurized Distribution Systems. Refer to OAR 340-71-275, for
pressurized distribution requirements.
(5) Distribution Boxes and Drop Boxes:
(a) Construction. Construction of distribution boxes and drop boxes shall
comply with minimum standards in OAR 340-73-035 and 340-73-040.
(b) Foundation. All distribution boxes and drop boxes shall be bedded on
a stable, level base;
(c) In all gravity distribution techniques, the connection of the effluent
piping to the distribution piping shall include at least one distribution
or drop box or other device acceptable to the Agent as a means for
locating and monitoring the disposal field.
SSRULEA (04-01-95) 71-59 On -Site Disposal
0145-1485
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(6) Dosing Tanks:
(a) Construction of dosing tanks shall comply with the minimum
standards in OAR 340-73-025 and 340-73-050, unless otherwise
authorized in writing by the Department on a case-by-case basis;
(b) Each dosing tank shall be installed on a stable, level base;
(c) Each dosing tank shall be provided with at least one watertight riser
and manhole cover, extending to the ground surface or above.
Provision shall be made for securely fastening the manhole cover,
unless the manhole cover weighs at least 50 pounds;
(d) Dosing tanks located in high groundwater areas shall be weighted or
provided with an antibuoyancy device to prevent flotation.
(7) Disposal Trenches:
(a) Disposal trenches shall be constructed in accordance with the standards
contained in the following table, unless otherwise allowed or required
within a specific rule of this division:
(A) Minimum bottom width of trench ...... 24 inches;
(B) Minimum depth of trench, using:
(i) Equal or loop distribution ....... 18 inches;
(ii) Serial distribution ............ 24 inches;
(iii) Pressure distribution .......... 18 inches;
(C) Maximum depth of trench ........... 36 inches;
(D) Minimum distance of undisturbed earth between disposal
trenches ................... 8 feet.
(b) The bottom of the disposal trench shall be level within a tolerance of
plus or minus one (1) inch; .
(c) When the sidewall within the disposal trench has been smeared or
compacted, sidewalls shall be raked to insure permeability.
(d) Trenches shall not be constructed in a manner that would allow septic
tank effluent to flow backwards from the distribution pipe to under-
SSRULEA (04-01-95) 71-60 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1486
Water Quality Program
mine the distribution box, the septic tank, or any portion of the
distribution unit.
(e) Drain media shall extend the full width and length of the disposal
trench to a depth of not less than twelve (12) inches. There shall be at
least six (6) inches of drain media under the distribution pipe and at
least two (2) inches over the distribution pipe;
(f) Prior to backfilling the trench, the drain media shall be covered with
filter fabric, untreated building paper, or other material approved by
the Agent;
(g) Where trenches are installed in sand y loam or coarser soils, filter
fabric or other non -degradable material approved by the Agent shall be
used to cover the drain media.
(8) Trench Backfill:
(a) The installer shall assume responsibility for backfilling the system.
Backfill shall be carefully placed to prevent damage to the system;
(b) A minimum of six (6) inches of backfill is required, except in serial
systems where twelve (12) inches is required.
(c) Backfill shall be free of large stones, frozen clumps of earth, masonry,
stumps, or waste construction materials, or other materials that could
damage the system.
(9) Header Pipe(OAR 340-73-060): Header pipe shall be watertight, have a
minimum diameter of three (3) inches, and be bedded on undisturbed earth.
Where distribution boxes or drop boxes are used, header pipe shall be at
least four (4) feet in length.
(10) Distribution Pipe (OAR 340-73-060):
(a) Distribution pipes shall have a minimum diameter of three (3)
inches;
(b) Each disposal trench shall have distribution piping that is centered in
the trench and laid level within a tolerance of plus or minus one (1)
inch;
(c) Distribution piping, which complies with standards in OAR
340-73-060, may consist of perforated bituminized fiber,
perforated plastic, clay tile or concrete tile;
SSRULEA (04-01-95) 71-61 On -Site Disposal
0145-148'7
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(d) All perforated pipe shall be installed with centerline markings up;
(e) Concrete tile and clay tile shall be laid with grade boards and with
one-quarter (1/4) inch open joints. The top one-half (1/2) of the joints
shall be covered with strips of treated building paper, tar paper, tile
connectors, spacers, collars or clips, or other materials approved by
the Agent.
(11) Effluent Sewer (OAR 340-73-060): The effluent sewer shall extend at least
five (5) feet beyond the septic tank before connecting to the distribution unit.
It shall be installed with a minimum fall of four (4) inches per one hundred
(100) feet, but in no instance shall there be less than two (2) inches of fall
from one end of the pipe to the other. In addition, there must be a
minimum difference of 8 inches between the invert of the septic tank outlet
and the invert of the header to the distribution pipe of the highest lateral in a
serial distribution disposal field or the invert of the header pipe to the distri-
bution pipes of an equal distribution disposal field.
(12) Large Systems. Systems with a projected daily sewage flow greater than two
thousand five hundred (2,500) gallons shall be designed in accordance with
requirements set forth in OAR 340-71-520.
340-71-260 ALTERNATIVE SYSTEMS, GENERAL.
(1) Unless otherwise noted, all rules pertaining to the siting, construction, and
maintenance of standard subsurface systems shall apply to alternative
systems.
(2) General Requirements:
(a) Periodic Inspection of Installed Systems. Where required by rule of
the Commission, periodic inspections of installed alternative systems
shall be performed by the Agent. An inspection fee may be charged;
(b) A report of each inspection shall be prepared by the Agent. The
report shall list system deficiencies and correction requirements and
timetables for correction. A copy of the report shall be provided
promptly to the system owner. Necessary follow-up inspections shall
be scheduled.
SSRULEA (04-01-95) 71-62 On -Site Disposal
0145-1488
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-265 CAPPING FILLS.
(1) Criteria for Approval. In order to be approved for a capping fill system,
each site must meet all the following conditions:
(a) Slope does not exceed twelve (12) percent;
(b) Temporary water table is not closer than eighteen (18) inches to the
ground surface at anytime during the year. A six (6) inch minimum
separation must be maintained between the bottom of the disposal
trench and the temporary water table;
(c) Where a permanent water table is present, a minimum four (4) feet
separation shall be maintained between the bottom of the disposal
trench and the water table;
(d) Where material with rapid or very rapid permeability is present, a
minimum eighteen (18) inches separation shall be maintained between
the bottom of the disposal trench and soil with rapid or very rapid
permeability;
(e) Effective soil depth is eighteen (18) inches or more below the natural
soil surface;
(f) Soil texture from the ground surface to the layer that limits effective
soil depth is no finer than silty clay loam;
(g) A minimum six (6) inch separation shall be maintained between the
bottom of the disposal trench and the layer that limits effective soil
depth;
(h) The system can be sized according to effective soil depth in Table 4.
(2) Installation Requirements. The cap shall be constructed pursuant to permit
requirements. Unless otherwise required by the Agent, construction
sequence shall be as follows:
(a) The soil shall be examined and approved by the Agent prior to
placement. The texture of the soil used for the cap shall be of the
same textural class, or of one textural class finer, as the natural
topsoil;
(b) Construction of capping fills shall occur between June 1 and October 1
unless otherwise allowed by the Agent. The upper eighteen (18)
inches of natural soil must not be saturated or at a moisture content
which causes loss of soil structure and porosity when worked;
SSRULEA (04-01-95) 71-63 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1489
Water Qualify Program
(c) The disposal area and the borrow site shall be scarified to destroy the
vegetative mat.
(d) The system shall be installed as specified in the construction permit.
There shall be a minimum ten (10) feet of separation between the
edge of the fill and the absorption facility;
(e) Filter fabric shall be used between the drain media and the soil cap,
unless otherwise authorized by the Agent on a case-by-case basis;
(f) Fill shall be applied to the fill site and worked in so that the two (2)
contact layers (native soil and fill) are mixed. Fill material shall be
evenly graded to a final depth of ten (10) inches over the drain media
for an equal system, or sixteen (16) inches over the drain media for a
serial system . This is to allow for appropriate settled depths. Both
initial cap and repair cap may be constructed at the same time;
(g) The site shall be landscaped according to permit conditions and be
protected from livestock, automotive traffic or other activity that could
damage the system.
(3) Required Inspections. Unless waived by the Agent, the following minimum
inspections shall be performed for each capping fill installed:
(a) Both the disposal area and borrow material must be inspected for
scarification, soil texture, and moisture content, prior to cap
construction;
(b) Pre -cover inspection of the installed absorption facility;
(c) After cap is placed, to determine that there is good contact between
fill material and native soil (no obvious contact zone visible), adequate
depth of material, and uniform distribution of fill material;
(d) Final inspection, after landscaping or other erosion control measures
are established. A Certificate of Satisfactory Completion may be
issued at this point.
SSRULEA (04-01-95) 71-64 On -Site Disposal
0145-1490
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-270 EVAPOTRANSPIRATION -ABSORPTION (ETA) SYSTEMS.
(1) Criteria for Approval. ETA systems will only be approved for waste flows
which do not exceed 600 gallons per day and which meet criteria for
residential strength. Installation permits may be issued for ETA systems on
sites that meet all of the following conditions:
(a) The soil has moist matrix values and chromas greater than 2 within the
first twelve (12) inches of the soil profile;
(b) Mean annual precipitation does not exceed twenty-five (25) inches;
(c) There exists a minimum of thirty (30) inches of moderately -well to
well drained soil. The subsoil at a depth of twelve (12) inches and
below shall be fine textured;
(d) Slope shall not be less than six (6) percent nor more than fifteen (15)
percent. Exposure may be taken into consideration.
(2) Criteria for System Design. ETA beds shall be designed under the
following criteria:
(a) Beds shall be sized using a minimum eight hundred fifty (850) square
feet of bottom surface area per one hundred fifty (150) gallons of
projected daily sewage flow in areas where annual precipitation is
fifteen (15) to twenty-five (25) inches, or six hundred (600) square
feet of bottom surface area per one hundred fifty (150) gallons of
projected daily sewage flow in areas where annual precipitation is less
than fifteen (15) inches;
(b) Beds shall be installed not less than twelve (12) inches nor deeper than
twenty-four (24) inches into natural fine textured soil on the downhill
side and not more than thirty-six (36) inches deep on the uphill side;
(c) A minimum of one (1) distribution pipe shall be placed in each bed;
(d) The surface shall be seeded according to permit conditions;
(e) The bottom of the system shall be a minimum of six (6) inches above
the layer that limits effective soil depth;
(f) Laterals in the system shall not be further than ten (10) feet apart and
shall not be further than five (5) feet from the side of the excavated
bed or trench;
(g) The bed or trench shall be within two (2) inches of level;
SSRULEA (04-01-95) 71-65 On -Site Disposal
0145-1491
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(h) A minimum of twelve (12) inches of drain media is to be installed in
the trench;
(i) Filter fabric or material approved by the Agent shall cover the drain
media before the system is covered with soil;
(j) The system is to be covered with soil approved by the Agent. The soil
cover depth is to be a minimum of twelve (12) inches.
340-71-275 PRESSURIZED DISTRIBUTION SYSTEMS.
(1) Pressurized distribution systems receiving residential strength wastewater
may be permitted on any site meeting the requirements for installation of a
standard subsurface sewage disposal systems, or other sites where this
method of effluent distribution is preferable and all the following minimum
site conditions can be met.
(2) Except as provided in OAR 340-71-220(1)(c), pressurized distribution
systems shall be used where depth to soil as defined in OAR 340-71-100
(139)(a) and (b) is less than thirty-six (36) inches and the minimum
separation distance between the bottom of the disposal trench and soil as
defined in OAR 340-71-100 (139)(a) and (b) is less than eighteen (18)
inches.
(3) Pressurized distribution systems installed in soil as defined in OAR
340-71-100(139)(a) and (b) in areas with permanent water tables shall not
discharge more than four hundred fifty (450) gallons of effluent per one-half
(1/2) acre per day except where:
(a) Groundwater is degraded and designated as a non -developable resource
by the State Department of Water Resources; or
(b) A detailed hydrogeological study discloses loading rates exceeding
four hundred fifty (450) gallons per one-half (1/2) acre per day would
not increase the nitrate -nitrogen concentration in the groundwater
beneath the site, or at any down gradient location, above five (5)
milligrams per liter.
(4) Materials and Construction:
(a) General:
(A) All materials used in pressurized systems shall be structurally
sound, durable, and capable of withstanding normal stresses
incidental to installation and operation;
SSRULEA (04-01-95) 71-66 On -Site Disposal
0145-1492
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Nothing in these rules shall be construed to set aside applicable
building, electrical, or other codes. An electrical permit and
inspection from the Department of Commerce or the munici-
pality with jurisdiction (as defined in ORS 456.750(5)) is
required for pump wiring installation.
(b) Pressurized Distribution Piping. Piping, valves and fittings for
pressurized systems shall meet the following minimum requirements:
(A) All pressure transport, manifold, lateral piping, and fittings
shall meet or exceed the requirements for PVC 1120 pressure
pipe as identified in ASTM Specification D2241 . For pipe
diameters of one inch or less, the minimum pressure rating shall
be 200 pounds per square inch (psi); for diameters greater that
one inch, the minimum pressure rating shall be 160 psi;
(B) Pressure transport piping shall be uniformly supported along the
trench bottom, and at the discretion of the Agent, it shall be
bedded in sand or other material approved by the Agent. A
minimum eighteen (18) gauge green jacketed tracer wire or
green color coded metallic locate tape, shall be placed above
piping when crossing property lines or entering public property
or right of way;
(C) Orifices shall be located on top of the pipe, except as noted in
paragraph 4(b)(I) of this section;
(D) The ends of lateral piping shall be constructed with long sweep
elbows or equal method to bring the end of the pipe to ground
level. The ends of the pipe shall be provided with threaded
plugs or caps;
(E) All joints in the manifold, lateral piping, and fittings shall be
solvent welded, using the appropriate joint compound for the
pipe material. Pressure transport piping may be solvent welded
or rubber ring jointed;
(F) An 'isolation valve shall be placed on the pressure transport
pipe, in or near the dosing tank, when appropriate.
(G) A check valve shall be placed between the pump and the gate
valve, when appropriate
(H) All orifices shall be covered by a protective, durable, non-
corrosive orifice shield designed to keep orifices from being
SSRULEA (04-01-95) 71-67 On -Site Disposal
r 0145-1493
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
blocked by drain media or other system components. The
shields shall be removable for access to the orifices;
(I) Where conditions include but are not limited to, extended
freezing temperatures, temporary or seasonal use, or effluent
characteristics, the Agent may specify alternate orifice
orientation, and/or valve arrangements;
(J) Where the operation of a pump could result in siphonage of
effluent to below the normal off level of the pump, an anti -
siphon measure, in the form of a non -discharging valve,
designed for the specific purpose, shall be used. The anti -
siphon valve shall be installed and operated in accordance with
manufacturer's specifications.
(c) Disposal Trench Sizing and Construction:
(A) A system using disposal trenches shall be designed and sized in
accordance with the requirements of OAR 340-71-220(2);
(B) Disposal trenches shall be constructed using the specifications
for the standard disposal trench unless otherwise allowed by the
Department on a case-by-case basis;
(C) Pressure lateral piping shall have not less than six (6) inches of
drain media below, nor less than four (4) inches of drain media
above the piping;
(D) The top of the drain media shall be covered with filter fabric, or
other nondegradable material permeable to fluids that will not
allow passage of soil particles coarser than very fine sand. In
unstable soils, lining the sidewall may be required.
(d) Seepage Bed Construction:
(A) Seepage beds may only be used in soil as defined in OAR 340-
71-100 (139) (b) as an alternative to the use of disposal
trenches, for flows less than or equal to 600 gallons per day ;
(B) The effective seepage area shall be based on the bottom area of
the seepage bed. The minimum area shall be determined on the
basis of 200 square feet minimum per 150 gallons per day waste
flow;
(C) Beds shall be installed not less than eighteen (18) inches (twelve
(12) inches with a capping fill) nor deeper than thirty-six (36)
SSRULEA (04-01-95) 71-68 On -Site Disposal
0145-1494
DEPARTMENT OF ENVIRONMENTAL QUALITY Water .Quality Program
inches into the natural soil. The seepage bed bottom shall be
level;
(D) The top of the drain media shall be covered with filter fabric, or
other nondegradable material that is permeable to fluids but will
not allow passage of soil particles coarser than very fine sand;
(E) Pressurized distribution piping shall have not less than six (6)
inches of drain media below, nor less than four (4) inches of
drain media above the piping;
(F) Pressurized distribution piping shall be horizontally spaced not
more than four (4) feet apart, and not more than two (2) feet
away from the seepage bed sidewall. At least two (2) parallel
pressurized distribution pipes shall be placed in the seepage bed;
(G) A minimum of ten (10) feet of undisturbed earth shall be
maintained between seepage beds.
(e) Notwithstanding other requirements of this rule, when the projected
daily sewage flow is greater than two thousand five hundred (2500)
gallons the Department may approve other design criteria it deems
appropriate.
(5) Hydraulic Design Criteria. Pressurized distribution systems shall be
designed for appropriate head and capacity:
(a) Head calculations shall include maximum static lift, pipe friction and
orifice head requirements:
(A) Static lift where pumps are used shall be measured from the
minimum dosing tank level to the level of the perforated
distribution piping;
(B) Pipe friction shall be based upon a Hazen Williams coefficient
of smoothness of 150. All pressure lateral piping and fittings
shall have a minimum diameter of two (2) inches unless sub-
mitted plans and specifications show a smaller diameter pipe is
adequate;
(C) There shall be a minimum head of five (5) feet at the remotest
orifice and no more than a ten (10) percent flow variation
between nearest and remotest orifice in an individual unit.
(b) The capacity of a pressurized distribution system refers to the rate of
flow given in gallons per minute (gpm):
SSRULEA (04-01-95) 71-69 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(A) Lateral piping shall have discharge orifices drilled a minimum
diameter of one-eighth (1/8) inch, and evenly spaced at a
distance not greater than twenty-four (24) inches in coarse
textured soils or greater than four (4) feet in finer textured soils;
(B) The system shall be dosed at a rate not to exceed twenty (20)
percent of the projected daily sewage flow;
(C) The effect of back drainage of the total volume of effluent
within the pressure distribution system shall be evaluated for its
impact upon the dosing tank and system operation.
340-71-280 SEEPAGE TRENCH SYSTEM.
(1) Criteria for Approval. Construction permits may be issued by the Agent for
seepage trench systems on lots created prior to January 1, 1974, for sites
that meet all the following conditions:
(a) Groundwater degradation would not result;
(b) Lot or parcel is inadequate in size to accommodate a standard
subsurface disposal system with a projected flow of four hundred fifty
(450) gallons per day;
(c) All other requirements for standard subsurface systems can be met.
(2) Design Criteria:
(a) The seepage trench may have a maximum depth of forty-two (42)
inches;
(b) The seepage trench system shall be sized according to the following
formula: Length of seepage trench = (4) x (length of standard
disposal trench) divided by (3 + 2D), where D = depth of drain
media below distribution pipe in feet. Maximum depth of drain
media (D) shall be two (2) feet;
(c) The projected daily sewage flow shall be limited to a maximum of four
hundred fifty (450) gallons.
SSRULEA (04-01-95) 71-70 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-285 REDUNDANT SYSTEMS.
(1) Criteria for Approval. Construction installation permits may be issued by
the Agent for redundant disposal field systems to serve single family
dwellings on sites that meet all the following conditions:
(a) The lot or parcel was created prior to January 1, 1974; and
(b) There is insufficient area to accommodate a standard system.
(2) Design Criteria:
(a) Each redundant disposal system shall contain two (2) complete
disposal fields;
(b) Each disposal field shall be adequate in size to accommodate the
projected daily sewage flow from the dwelling;
(c) A minimum separation of ten (10) feet (twelve (12) feet on centers)
shall be maintained between disposal trenches designed to operate
simultaneously, and a minimum separation of four (4) feet (six (6) feet
on centers) shall be maintained between adjacent disposal trenches;
(d) The system shall be designed to alternate between the disposal fields
with the use of a diversion valve or other method approved by the
Agent.
340-71-290 CONVENTIONAL SAND FILTER SYSTEMS.
(1) Criteria for Approval. A conventional sand filter, which meets the require-
ments of this rule may be approved for a construction -installation permit,
provided that wastewater strength does not exceed that of residential strength
wastewater and the system is to serve a single family dwelling. All others
shall be constructed pursuant to a WPCF Permit.
(2) Inspection and Maintenance Requirements.
(a) Each sand filter system installed under this rule, and those filters
installed under OAR 340-71-038, may be inspected by the Agent
periodically. The Agent may charge an inspection fee each year the
sand filter is inspected;
(b) Any permit issued by the Agent shall include requirements for periodic
inspection and maintenance. Reports of this maintenance may be
required to be submitted to the Agent.
SSRULEA (04-01-95) 71-71 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(3) Sites Approved for Sand Filter Systems. Sand filters may be permitted on
any site meeting requirements for standard subsurface sewage disposal
systems contained under OAR 340-71-220, or where standard or pressurized
disposal trenches would be used, or where selected by the Agent, and all the
following minimum site conditions can be met:
NOTE: Groundwater levels shall be predicted using
Standards in OAR 340-71-130(24).
(a) The highest level attained by temporary water would be:
(A) Twelve (12) inches or more below ground surface where
gravity equal distribution trenches are used. Pressurized
distribution trenches may be used to achieve equal distribution
on slopes up to twelve (12) percent; or
(B) Twelve (12) inches or more below ground surface on sites re-
quiring serial distribution where disposal trenches are covered
by a capping fill, provided: trenches are excavated twelve (12)
inches into the original soil profile, slopes are twelve (12) per-
cent or less, and the capping fill is constructed according to
provisions under OAR 340-71-265(2) and 340-71-265(3)(a)
through (c); or
(C) Eighteen (18) inches or more below ground surface on sites
requiring serial distribution where standard serial distribution
trenches are used.
(b) The highest level attained by a permanent water table would be equal
to or more than distances specified as follows:
*Minimum Separation
Distance from Bottom
Soil Groups Effective Seepage Area
(A) Gravel, sand, loamy sand,
sandy loam ................... 24 inches;
(B) Loam, silt loam, sandy clay
loam, clay loam ................ 18 inches;
(C) Silty clay loam, silty clay,
clay, sandy clay ................ 12 inches.
*NOTE: Shallow disposal trenches (placed not less than twelve
(12) inches into the original soil profile) may be used with a
SSRULEA (04-01-95) 71-72 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
capping fill to achieve separation distances from permanent
groundwater. The fill shall be placed in accordance to the
provisions of OAR 340-71-265(2) and 340-71-265(3)(x) through
(c).
(c) Sand filters installed in soils as defined in OAR 340-71-100 (139), in
areas with permanent water tables shall not discharge more than four
hundred fifty (450) gallons of effluent per one-half (1/2) acre per day
except where:
(A) Groundwater is degraded and designated as a non -developable
resource by the State Department of Water Resources; or
(B) A detailed hydrogeological study discloses loading rates
exceeding four hundred fifty (450) gallons per one-half (1/2)
acre per day would not increase nitrate -nitrogen concentration in
the groundwater beneath the site, or any down gradient location,
above five (5) milligrams per liter.
(d) Soils, fractured bedrock or saprolite diggable with a backhoe occur
such that a standard twenty-four (24) inch deep trench can be installed
and, in the judgment of the Agent, the soils, fractured bedrock, or
saprolite is permeable to the extent that effluent will absorb adequately
so as not to hinder the performance of the filter or disposal field. The
Agent may require that an absorption test be conducted to determine
the permeability of the bedrock or saprolite. Test methods must be
acceptable to the Department;
(e) Where slope is thirty (30) percent or less, except as specified in
subsection (f) of this section;
(f) A sand filter may be installed on land slopes up to 45 percent where:
(A) the installation is for a single family dwelling and is sized in
accordance with sand filter disposal area criteria;
(B) the soil is diggable with a backhoe to a depth of at least 36"
(12" below the bottom of the trench); and
(C) the temporary water table is at least 30" below the ground
surface (6" below the bottom of the trench).
(g) Setbacks in Table 1 can be met, except the minimum separation
distance between the sewage disposal area and surface public waters
shall be no less than fifty (50) feet.
SSRULEA (04-01-95) 71-73 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(4) , The minimum length of standard disposal trench per one hundred fifty (150)
gallons projected daily sewage flow required for a sand filter absorption
facility is indicated in the following table:
Soil Groups Linear Feet
(a) Gravel, sand, loamy sand,
sandy loam ........................... 35;
(b) Loam, silt loam, sandy clay loam,
clay loam ............................ 45
(c) Silty clay loam, silty clay,
sandy clay, clay ....................... 50;
(d) Permeable saprolite or fractured bedrock ....... 50;
(e) High shrink -swell clays (Vertisols) ........... 75.
NOTES
-1- Disposal trenches in Vertisols shall contain twenty-four (24)
inches of drain media and twenty-four (24) inches of soil
backfill.
-2- On lots created prior to January 1, 1974, that have insufficient
suitable area within which to install an absorption facility sized
in accordance with this table, seepage trenches may be used at
the Agent's discretion, providing: the design criteria and
limitations contained in OAR 340-71-280 (2) are met; the soil is
not a high shrink -swell clay; and all other provisions of this rule
are met except that a temporary water table shall be thirty (30)
inches or more below the ground surface.
-3- Seepage trenches in Vertisols are limited to areas with an annual
rainfall of 25 inches or less, with minimum slopes of 5 percent,
and a temporary water table which is at least 48 inches below
the ground surface.
(5) Sand Filter Without a Bottom. Sites with saprolite, fractured bedrock,
gravel or soil textures of sand, loamy sand, or sandy loam in a continuous
section at least two (2) feet thick in contact with and below the bottom of the
sand filter, that meet all other requirements of section 340-71-290(3) may,
utilize either a conventional sand filter without a bottom or a sand filter in a
trench that discharges biologically treated effluent directly into those
materials. The application rate shall be based on the design sewage flow in
OAR 340-71-295(1) and the basal area of the sand in either type of sand
SSRULEA (04-01-95) 71-74 On -Site Disposal
0145-1500
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
filter. A minimum twenty-four (24) inch separation shall be maintained
between a water table and the bottom of the sand filter. The water table
shall be no less than 24 inches below the ground surface at any time of the
year. In the judgment of the Agent, the saprolite, fractured bedrock, gravel
or soil, shall be permeable over the basal area to the extent that effluent will
absorb adequately so as not to hinder the performance of the filter. The
Agent may require that an absorption test be conducted to determine the
permeability of the basal area. Test methods must be acceptable to the
Department.
(6) Materials and Construction:
(a) All materials used in sand filter system construction shall be
structurally sound, durable and capable of withstanding normal
installation and operation stresses. Component parts subject to
malfunction or excessive wear shall be readily accessible for repair
and replacement;
(b) All filter containers shall be placed over a stable level base;
(c) In a gravity operated distribution system, a vertical separation be-
tween the invert of the underdrain piping outlet and the top of the
drain media in the uppermost disposal trench shall be maintained that
will not allow effluent to back up into the sand filter base before
surfacing over the uppermost disposal trench;
(d) Piping and fittings for the sand filter distribution system shall be as
required under pressure distribution systems, OAR 340-71-275;
(e) The specific requirements for septic tanks, dosing tanks, etc. are
found in OAR 340-71-220;
(f) The requirements in OAR 340-71-295 shall be met;
(g) A bottomless sand filter unit does not require a minimum 10 foot
separation between the original and replacement unit.
(7) "Graveless Absorption Method"
(a) Following a sand filter, disposal trenches may be constructed without
the use of drain media, to the following minimum criteria:
(A) Twelve (12) inches wide by ten (10) inches deep incorporating
pressurized distribution and a chamber constructed of half
sections of twelve (12) inch diameter plastic irrigation pipes
(PIP);
SSRULEA (04-01-95) 71-75 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Trenches shall be level end to end and across their width;
(C) At the discretion of the Agent, trenches may be installed on
minimum three (3) foot centers maintaining at least two (2) feet
of undisturbed earth between parallel trench sidewalls;
(D) Piping shall be minimum one inch diameter PVC meeting all the
requirements of these rules;
(E) Distribution piping shall be perforated with one-eighth inch
diameter orifices on maximum two foot centers at the twelve
o'clock position. The hydraulic design shall provide at least
two feet residual head at the distal orifice; and
(F) The chambers shall have an adequate footing to support the soil
cover and all normal activity, and at a minimum shall be
constructed of twelve inch PIP rated at 43 pounds per square
inch meeting the appendix standards of ASTM D-2241. Each
line shall be equipped with a minimum six inch diameter
inspection port.
(b) Except as noted in subsection (a) of this section, all other construction
and siting criteria including but not limited to the disposal field sizing
for sand filter systems in OAR 340-71-290(4), and area to
accommodate the installation of an initial and replacement absorption
facility meeting standard trench separations in OAR 340-71-
220(7)(a)(D), shall apply. Plans verifying that a system could be
installed on the parcel that will meet the requirements in OAR 340-71-
290(4) and 340-71-220(7)(a)(D) and all other applicable rules, are
required before approval of this method.
(c) This disposal field option may be used wherever a standard or
alternative type disposal trench is authorized by current rules for sand
filter systems, except for Vertisols.
SSRULEA (04-01-95) 71-76 On -Site Disposal
0145-1502
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quay Progy=
340-71-295 CONVENTIONAL SAND FILTER DESIGN AND CONSTRUCTION.
(1) Sewage Flows:
(a) Design sewage flows for a system proposed to serve a commercial
facility shall be limited to twenty-five hundred (2,500) gallons or less,
with a wastewater strength not to exceed that defined for residential
waste strength, unless otherwise authorized in writing by the De-
partment;
(b) Design sewage flows for a system proposed to serve a single family
dwelling shall be in accordance with the provisions of OAR
340-71-220(2)(a).
(2) Minimum Filter Area.
(a) A sand filter proposed to serve a single family dwelling shall have an
effective medium sand surface area of not less than three hundred
sixty (360) square feet. If the design sewage flow exceeds four -
hundred fifty (450) gallons per day, the medium sand surface area
shall be determined with the following equation:
Area = (projected daily sewage flow) divided by (1.25) gallons per
square foot;
(b) A sand filter proposed to serve a commercial facility shall be sized on
the basis of projected peak daily sewage flow. If the waste strength is
projected to be greater than residential strength wastewater, as defined
in this division, a pre-treatment device shall be required which will
reduce the BODS, TSS, and oil and grease to no more than 300, 150,
and 25 mg/l, respectively, and to eliminate any other contaminates
prior to treatment in the sand filter system.
(3) Design Criteria:
(a) The interior base of the filter container shall be level or constructed at
a grade of one (1) percent or less to the underdrain piping elevation;
(b) Except for sand filters without a bottom, underdrain piping shall be
installed in the interior of the filter container at the lowest elevation.
The piping shall be level or on a grade of one (1) percent or less to
the point of passage through the filter container;
(c) The underdrain piping and bottom of the filter container shall be
covered with a minimum of six (6) inches of drain media or
underdrain media. Where underdrain media is used, the underdrain
SSRULEA (04-01-95) 71-77 On -Site Disposat
0145-1503
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
piping shall be enveloped in an amount and depth of drain media to
prevent migration of the underdrain media to the pipe perforations;
(d) Where drain media is used at the base of the filter, it shall be covered
by a layer of filter fabric meeting the specifications found in OAR
340-73-041. Where underdrain media is used, filter fabric is not
required or prescribed;
(e) A minimum of twenty-four (24) inches of approved sand filter media
shall be installed over the filter fabric or underdrain media. Where
medium sand is used, the sand shall be damp at the time of installa-
tion. The top surface of the media shall be level. Unless waived by
the Agent, the sand filter media proposed for each sand filter, shall be
sieve tested to determine conformance with the criteria outlined in
these rules. The sieve analysis shall be done in accordance with ASTM
C-136, Standard Methods for Sieve Analysis of Fine and Coarse.
Aggregate, and in conjunction and accordance with ASTM C-117,
Standard Test Method for Materials Finer than No. 200 Sieve in
Mineral Aggregates by Washing. A sieve analysis by a qualified party
shall be conducted and report issued prior to each sand filter in-
stallation;
(f) There shall be a minimum of three (3) inches of clean drain media
below the distribution laterals, and sufficient media above the laterals
equal to or covering the orifice shields to provide a smooth even
cover. Underdrain media may be used in lieu of drain media;
(g) Within the zone described in subsection (f) of this section, a
pressurized distribution system, meeting the requirements of OAR
340-71-275(4) and (5), shall be constructed, with the following
requirements:
(A) Distribution laterals shall be spaced on maximum thirty (30)
inch centers. Orifices shall be placed such that there is one
orifice for each six (6) square feet of sand surface area;
(B) The distribution laterals shall have not less than three (3) inches
of drain or underdrain media below the piping;
(C) The ends of the distribution laterals shall be designed and
constructed with a means to perform flushing of the piping,
collectively or individually, through the operation of a non-
corrosive and accessible valve. The flushed effluent may be
discharged to the septic tank or into the sand filter;
SSRULEA (04-01-95) 71-78 On -Site Disposal
r
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1504
Water Quality Program
(D) The diameters of the distribution manifold and laterals shall not
be less than one half (1/2) inch diameter.
(E) A sand filter shall be dosed at a rate not to exceed ten (10)
percent of the projected daily sewage flow.
(h) The top of the media in which the pressure distribution system is in-
stalled shall be covered with filter fabric meeting the specifications
found in OAR 340-73-041;
(i) The top of the sand filter area shall be backfilled with a soil cover,
free of rock, vegetation, wood waste, etc. The soil cover shall have a
textural class no finer than loam, unless otherwise authorized by the
Agent. The soil cover shall have a minimum depth of six (6) inches
and a maximum depth of twelve (12) inches;
(j) The passage of all piping through the sand filter container shall be
done in a watertight manner.
(4) Container Design and Construction:
(a) A reinforced concrete container consisting of watertight walls and
floors shall be used where water tightness is necessary to prevent
groundwater from infiltrating into the filter or to prevent the effluent
from exfiltrating from the filter, except as provided in these rules.
The container structure may require a building permit for construc-
tion;
(b) Container may be constructed of materials other than concrete where
equivalent function, workmanship, watertightness and at least a twenty
(20) year service life can be documented:
(A) Flexible membrane liner (FML) materials must have properties
which are at least equivalent to thirty (30) mil un -reinforced
polyvinyl chloride (PVC) described in OAR 340-73-085. To be
approved for installation, FML materials must:
(i) Have field repair instructions and materials which are
provided to the purchaser with the liner; and
(ii) Have factory fabricated "boots" suitable for field
bonding onto the liner to facilitate the passage of piping
through the liner in a waterproof manner.
(B) Where accepted for use, flexible sheet membrane liners shall be
installed as required in OAR 340-73-085.
SSRULEA (04-01-95) 71-79 On -Site Disposal
0145-1505
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(5) Internal Pump Option: Where the effluent from a sand filter is to be dis-
charged by means of a pump to another treatment unit, a distribution unit, or
to an absorption facility, the design and construction of the filter may
include provisions for an internal pump station, providing the following
conditions are met:
(a) The location, design, and construction of the pump station does not
conflict with rules for design, construction and operation of a sand
filter system;
(b) The design and construction of the pump, discharge plumbing,
controls, and alarm shall meet the requirements of OAR 340-73-055,
except OAR 340-73-055(4)(d) and (4)(h);
(c) The pump and related apparatus shall be housed in a corrosion re-
sistant vault designed to withstand the stresses places upon it and not
allow the migration of drain media, sand, or underdrain media to its
interior. The vault shall have a durable, affixed floor. The vault shall
provide watertight access to finished grade with a diameter equal to
that of the vault and designed to receive treated effluent from an
elevation equal to that of a gravity discharging sand filter;
(d) The depth of underdrain media and the operating level of the pump
cycle and alarm shall not allow effluent to come within two inches of
the bottom of the sand filter media. The pump off level shall be no
lower than the invert of the perforations of the underdrain piping;
(e) The internal sand filter pump shall be electrically linked to the sand
filter dosing apparatus in such a manner as to prevent effluent from
entering the sand filter in event the internal sand filter pump fails.
340-71-300 OTHER SAND FILTER DESIGNS.
(1) Other sand filters which vary in design from the conventional sand filter may
be authorized by the Department if they can be demonstrated to produce
comparable effluent quality.
(2) Sand filters authorized under this Section, which serve a single family
dwelling with residential strength wastewater, may be approved for a
construction/installation permit. All other sand filters shall be constructed
and operated under a renewable WPCF permit issued pursuant to OAR 340-
71-162.
(3) Pre -Application Submittal. Prior to applying for a construction permit for a
variation to the conventional sand filter the Department must approve the
JSRULEA (04-0I-95) 7I-80 On -Site Disposal
0145-1506
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
design. To receive approval the applicant shall submit. the following
required information to the Department:
(a) Effluent quality data. Filter effluent quality samples shall be collected
and analyzed by a testing agency acceptable to the Department using
procedures identified in the latest edition of "Standard Methods for
the Examination of Wastewater," published by the American Public
Health Association, Inc. The duration of filter effluent testing shall be
sufficient to ensure results are reliable and applicable to anticipated
field operating conditions. The length of the evaluation period and
number of data points shall be specified in the test report. The
following parameters shall be addressed:
(A) BODS;
(B) TSS;
(C) Fecal coliform;
(D) Nitrogen (Ammonia, Nitrate and Total Kjeldahl Nitrogen).
(b) A description of unique technical features and process advantages;
(c) Design criteria, loading rates, etc;
(d) Filter media characteristics;
(e) A description of operation and maintenance details and
requirements;
(f) Any additional information specifically requested by the Department.
(4) Construction Procedure. Following pre -application approval, a permit
application shall be submitted in the usual manner. Applications shall
include applicable drawings, details and written specifications to fully
describe proposed construction and allow system construction by contractors.
Included must be the specific site details peculiar to that application,
including soils data, groundwater type and depth, slope, setbacks, existing
structures, wells, roads, streams, etc. Applications shall include a manual
for homeowner operation and maintenance of the system.
SSRULEA (04-01-95) 71-81 On -Site Disposal
r 0145-1507
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-302 RECIRCULATING GRAVEL FILTER (RGF).
(1) WPCF Permit Required. A WPCF wastewater disposal permit is required
for all recirculating gravel filters. The permit will establish the effluent
limitations to be achieved. No construction shall take place until the permit
has been issued and final construction plans have been approved by the
Department. Conceptual (preliminary) plans shall accompany all
applications.
(2) Plan Approval Required. Facility construction plans shall be submitted to
the Department for review. Review of plans shall follow OAR Chapter 340,
Division 52 procedures.
(3) Technical Requirements and Guidelines. The following sections describe
minimum technical requirements and guidelines for design. Use of "shall"
denotes a requirement. Use of "should" implies a guideline to be followed
unless sufficient justification is provided to the contrary as determined by the
plan approver. The Department will consider variations in design
established in this section on a case-by-case basis. Plans which vary in
design shall include evidence that the proposed system will meet the
limitations established in the permit, and that the facility can be reliably
operated and maintained.
(a) Filter Design and Dosing:
(A) Filter area shall be sized based on a maximum organic load.
The area shall mean basal or bottom area. For residential
strength wastewater which has been pre-treated through a septic
tank, the maximum hydraulic load shall be 5 gal/ft2/day;
(B) For BODS waste strengths stronger than residential strength
wastewater but not exceeding 400 mg/l (milligrams per liter),
the filter size shall be increased proportionately.
(C) Higher strength wastewaters shall be pre-treated or will require
special consideration. The concentration of greases and oil
applied shall in no case exceed 30 mg/l.
(b) Filter Media:
(A) Where carbonaceous BODS removal must be at least 85 percent,
based upon the raw sewage concentration applied to the septic
tank, and nitrification of wastewater is necessary, a filter media
of the following fine gravel shall be required: 3 feet of very
fine washed gravel, 100 percent passing a 3/8" sieve with an
Effective Size between 3 and 5 millimeters, and an Uniformity
SSRULEA (04-01-95) 71-82 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
Coefficient of 2 or less. Washed shall mean that negligible
fines (less than 1.0%) pass the No. 10 sieve;
(B) Where additional removal of BODS and denitrification is
intended or required, a treatment media of the following coarse
sand may be approved: 2 feet of very coarse washed sand, 100
percent passing a 3/8" sieve with an Effective Size between 1.5
and 2.5 millimeters, and an Uniformity Coefficient of 2 or less.
Washed shall mean that negligible fines (less than 4.0%) pass
the No. 100 sieve;
(C) Sieves used in gradation analysis shall include 3/8 inch, 1/4
inch, and Nos. 4, 6, 8, 10, 50 and 100;
(D) For each project, and prior to shipment of any media to the
project site, the permittee shall take fresh samples of the
intended media. The permittee shall have a laboratory gradation
analysis performed, and the gradation data plotted on semi -log
paper as a gradation curve. Lab data, gradation curve, and a 5
pound sample of the media shall be submitted to the Department
for approval. Only Department approved media shall be used;
(E) A quality assurance plan shall be proposed by the designer to
guarantee only approved media is placed. This plan shall be
included in the project specifications;
(F) The Department may approve minor deviations in media
gradations on a project -by -project basis.
(c) Filter media shall be overlain by a three (3) inch bed of 1/2" to 3/4"
washed gravel. It shall be only lightly covering the distribution
piping. Unless otherwise authorized, each orifice is covered by an
orifice shield. Orifice shields shall prevent aerial spray drift;
(d) Filter dosing shall be with a low pressure distribution piping system
operating under adequate head to pressurize the system. This should
usually be 5 feet. Each lateral pipe end shall terminate with a screwed
plug or cap, accessible for removal and flushing. Wherever practical
a valved backflush system shall be installed to flush groups of laterals
back to a septic tank or elsewhere;
(e) Pressure distribution piping should be spaced 2 feet on center in a
parallel grid. Orifice spacing should be each 2 feet on laterals.
Piping grid edges should be within one foot of the filter basal edge;
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(f) Filter media shall be underlain by an 6 inch bed of a 3/8 to 3/4 inch
washed gravel underdrain media. There shall be no filter fabric over
the underdrain media;
(g) Perforated collection pipes shall be bedded in the underdrain media.
Pipes shall be 4 inch minimum diameter with no filter fabric wrap.
There should be at least 15 lineal feet of collection pipe for each 225
square feet of filter basal area;
(h) The filter container shall be watertight to suit the design conditions.
Underflow shall be contained. Groundwater shall be excluded. A
concrete container may be used. Other materials may be used where
equivalent function, workmanship, watertightness and at least a twenty
(20) year service life can be expected.
(4) Recirculation/Dilution Tank:
(a) A recirculatipn tank receives septic tank effluent and underflow from
the filter. A pumping system at this tank delivers flow to the filter
dose piping network according to a project design. The recirculation
tank volume (measured from tank floor to soffit) shall be numerically
equal to the projected daily sewage flow volume;
(b) The recirculation ratio at design flow shall be not less than four (4).
Recirculation ratio is the daily volume of recycle divided by design
daily volume of the wastewater. A fabricated "T" or "Splitter T"
float valve located in the recirculation tank should be used whenever
possible. Minimum recirculation tank liquid volume should be no less
than 80 percent of the gross tank volume when a float valve is used.
Alternatively, a splitter basin using orifice or weir control may be
used where required and reasonable to divide underflow 20 percent to
disposal and 80 percent to recycle on a daily basis. Orifice control
should be used wherever possible. Minimum recirculation tank liquid
volume should be no less than 50 percent of the gross tank volume
when a splitter basin is used;
(c) An evaluation and design for overflow and surge control at the
recirculation tank shall be included in each design;
(d) A high water alarm shall be included in the recirculation tank
immediately below the overflow level. A latching electrical relay shall
retain the alarm — audible and/or visual — until acknowledged by a
site attendant;
(e) Parallel pump start/stop electric controls (usually floats) should be
installed to correct any unforeseen high liquid level event and keep
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qualify Program
sewage contained. This pump start function merely precludes overflow and
shall operate in parallel with the start/stop function of a timer. It shall not
interfere with or depend upon a timer position;
(f) All areas of the filter should be wetted 48 times a day, or each 30
minutes, to achieve the recirculation ratio of at least four (4);
(g) The recirculation tank shall be demonstrated as watertight. Testing
should be witnessed by the designer. Test protocol shall be included in
the plans;
(h) Access onto the filter shall be restricted. This should be a fence. Surface
water entry onto the filter shall be positively prevented by design and
construction;
(i) Access openings to the recirculation tank shall be provided at each end.
Larger tanks should have additional openings. The least dimension of
any access opening shall be 18 inches. Larger openings shall be provided
if partially obstructed with piping, etc. Provision shall be made to
remove dregs (settleable solids). Pumps shall be readily removable and
replaceable without demolition of piping, etc.
(5) Operation and Maintenance (O&M) Manual. The permittee shall submit a draft
Operation and Maintenance manual before the facility commences operation.
The facility designer should do actual preparation. This manual shall
incorporate as -constructed details, and be completed in final form for the
owner's use following final inspection of the completed facility. It shall include
a statement of Inspection and Certification of Proper Construction. The
designer shall affirm that the facility is operating as intended based upon actual
field inspection at end of construction and start of operations. If there are any
negative findings, these shall be reported and correction proposed by the per-
mittee.
340-71-305 SAND FILTER SYSTEM OPERATION AND MAINTENANCE.
(1) Sand filters serving a single family dwelling with wastewater not exceeding
"Residential Waste Strength" shall be subject to the following provisions:
(a) Sand filter operation and maintenance tasks and requirements shall be as
specified on the Certificate of Satisfactory Completion. Where a
conventional sand filter system or other sand filter system with
comparable operation and maintenance requirements is used, the system
owner shall be responsible for the continuous operation and maintenance
of the system;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(b) The owner of a sand filter system shall inspect the septic tank and other
components of the system at least every three years for sludge accumu-
lation, pump calibration and cleaning of the laterals. The septic tank
shall be pumped when there is an accumulation of floating scum less than
three (3) inches above the bottom of the outlet tee or an accumulation of
sludge less than six (6) inches below the bottom of the outlet tee. A
dosing septic tank shall be pumped according to manufacturers specifi-
cations. The owner shall provide the Agent certification of tank pumping
within two (2) months of the date required for pumping. Pump calibra-
tion, cleaning of the laterals and other maintenance shall be completed as
necessary;
(c) No permit shall be issued for the installation of any other sand filter
which in the judgment of the Department would require operation and
maintenance significantly greater than the conventional sand filter unless
arrangements for system operation and maintenance meeting the approval
of the Director have been made which will ensure adequate operation and
maintenance for the life of the system. Each permitted installation may
be inspected by the Agent at least every twelve (12) months and checked
for necessary corrective maintenance. The Agent may waive the annual
system evaluation fee during years when the field evaluation work is not
performed; ,
(2) Operation and maintenance requirements for sand filters serving Commercial
facilities shall be specified in a WPCF permit issued pursuant to OAR 340-71-
162 of this Division.
(3) Operation and Maintenance Standards for all sand filters. The owner/purchaser
of a sand filter system shall assume the continuous responsibility to preserve the
installation as near as practical in its "as built" state. This responsibility
includes the control or erosion of any "mound," the control and removal of
large perennial plants, the fencing out of livestock and the control of burrowing
animals.
340-71-310 STEEP SLOPE SYSTEMS.
(1) General conditions for approval. An on-site system construction permit may
be issued by the Agent for a steep slope system to serve a single-family dwelling
on slopes in excess of thirty (30) percent provided all the following requirements
can be met:
(a) Slope does not exceed forty-five (45) percent.
(b) The soil is well drained with no evidence of saturation.
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DEPARTMENT OF ENWRONMF,NTAL QUALITY Water Quality Program
(c) The soil has a minimum effective soil depth of sixty (60) inches.
(2) Construction Requirements:
(a) Seepage trenches shall be installed at a minimum depth of thirty (30)
inches and at a maximum depth of thirty-six (36) inches below the natural
soil surface on the downhill side of the trench, and contain a minimum of
eighteen (18) inches of filter material and twelve (12) inches of native soil
backfill.
(b) The system shall be sized at a minimum of seventy-five (75) linear feet
per one hundred fifty (150) gallons projected daily sewage flow.
340-71-315 TILE DEWATERING SYSTEM.
(1) General conditions for approval. On-site system construction permits may be
issued by the Agent for tile dewatering systems provided the following
requirements can be met:
(a) The site has a natural outlet that will allow a field tile installed on a
proper grade around the proposed absorption facility to daylight above
annual high water;
(b) Soils must be silty clay loam or coarser textured and be drainable, with a
minimum effective soil depth of at least thirty (30) inches in soils with
temporary groundwater, and at least seventy-two (72) inches in soils with
permanent groundwater;
(c) Slope does not exceed three (3) percent;
(d) All other requirements for the system, except depth to groundwater, can
be met. However, after the field collection drainage tile is installed, the
groundwater levels shall conform to the requirements of OAR 340-71-220
(1) or 340-71-290(3).
(2) Construction Requirements:
(a) Field collection drainage tile shall be installed on a uniform grade of
two-tenths to four -tenths (0.2-0.4) feet of fall per one hundred (100) feet,
and either:
(A) A minimum of thirty-six (36) inches deep in soils with temporary
groundwater; or
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Water Quality Program
(B) A minimum of sixty-six (66) inches deep in soils with permanent
groundwater.
(b) Maximum drainage tile spacing shall be seventy (70) feet center to center;
(c) Minimum horizontal separation distance between the drainage tile and
absorption facility shall be twenty (20) feet;
(d) Field collection drainage tile shall be rigid smooth wall perforated pipe ,
or other approved pipe material accepted by the Agent, with a minimum
diameter of four (4) inches;
(e) Field collection drainage tile shall be enveloped in clean filter material to
within thirty (30) inches of the soil surface in soils with permanent
groundwater, or to within twelve (12) inches of the soil surface in soils
with temporary groundwater. Drain media shall be covered with filter
fabric, treated building paper or other nondegradable material approved
by the Agent;
(f) Outlet tile shall be rigid smooth wall solid PVC pipe , meeting or
exceeding ASTM Standard D-3034, with a minimum diameter of four (4)
inches. A flap gate or rodent guard may be required by the Agent;
(g) A silt trap with a twelve (12) inch minimum diameter shall be installed
between the field collection drainage tile and the outlet pipe unless
otherwise authorized by the Department. The bottom of the silt trap shall
be a minimum twelve (12) inches below the invert of the drainage pipe
outlet;
(h) The discharge pipe and tile drainage system are integral parts of the
system, but do not need to meet setback requirements to property lines,
wells, streams, lakes, ponds or other surface waterbodies ;
(i) The Agent has the discretion of requiring demonstration that a proposed
tile dewatering site can be drained prior to issuing a Construction -
Installation permit;
0) The absorption facility shall use equal or pressurized distribution.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-320 SPLIT WASTE METHOD.
Criteria for Approval. In a split waste method, wastes may be disposed of as follows:
(1) Black wastes may be disposed of by the use of State Building Codes Division
approved nonwater-carried plumbing units such as recirculating oil flush toilets
or compost toilets.
(2) Gray water may be disposed of by discharge to:
(a) An existing on-site system which is not failing; or
(b) A new on-site system with a soil absorption facility two-thirds (2/3)
normal size. A full size initial disposal area and replacement disposal
area of equal size are required; or
(c) A public sewerage system.
340-71-325 GRAY WATER WASTE DISPOSAL SUMPS.
(1) Criteria for Approval:
(a) Hand -carried gray water may be disposed of in gray water waste disposal
sumps which serve facilities including but not limited to recreation parks,
camp sites, or construction sites where the projected daily gray water
flow does not exceed ten (10) gallons per unit. Gray water or other
sewage shall not be piped to the gray water waste disposal sump. Where
projected daily sewage flow exceeds ten (10) gallons per unit, gray water
shall be disposed of in facilities meeting requirements of OAR 340-
71-320(2);
(b) Gray water sumps may be used only where soil conditions are approved
for such use by the Agent;
(c) Up to four (4) gray water waste disposal sumps may be constructed on
the same property and at the same time for each construction -installation
permit issued.
(2) In campgrounds or other public use areas, gray water waste disposal sumps shall
be identified as "sink waste disposal" by placard or sign in letters not less than
three (3) inches in height and in a color contrasting with the background.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-330 NONWATER-CARRIED FACILITIES.
(1) No person shall cause or allow the installation or use of a nonwater-carried
waste disposal facility without prior written approval from the Agent.
EXCEPTIONS:
-1- Temporary use pit privies used on farms for farm labor shall be exempt
from approval requirements.
-2- A Sewage Disposal Service business licensed pursuant to OAR 340-71-
600 may install portable toilets without written approval of the Agent,
providing all other requirements of this rule except Table 8 setbacks are
met.
(2) Non -water carried waste disposal facilities may be approved for temporary or
limited use areas, including but not limited to recreation parks, camp sites,
farm labor camps, or construction sites, provided all liquid wastes can be
handled in a manner to prevent a public health hazard and to protect public
waters, provided further that the separation distances in Table 8 can be met.
EXCEPTION: The use of portable toilets shall not be allowed for seasonal
dwellings:
(3) Construction. Nonwater-carried waste disposal facilities shall be constructed in
accordance with requirements contained in OAR 340-73-065 through 340-73-
075.
(4) Maintenance. Nonwater-carried waste disposal facilities shall be maintained to
prevent health hazards and pollution of public waters.
(5) General. No water -carried sewage shall be placed in nonwater-carried waste
disposal facilities. Contents of nonwater-carried waste disposal facilities shall
not be discharged into storm sewers, on the surface of the ground or into public
waters.
(6) Pit Privy:
(a) Unsealed earth pit type privies may be approved where the highest level
attained by groundwater shall not be closer than four (4) feet to the
bottom of the privy pit;
(b) The privy shall be constructed to prevent surface water from running into
the pit;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Progrm
(c) When the pit becomes filled to within sixteen (16) inches of the ground
surface, a new pit shall be excavated and the old pit shall be backfilled
with at least two (2) feet of earth.
(7) No person shall cause or allow the installation or use of a portable toilet unless
the pumping or cleaning of the portable toilet is covered by a valid and effective
contract with a person licensed pursuant to ORS 454.695. Each portable toilet
shall display the business name of the sewage disposal service that is responsible
for servicing it.
340-71-335 CESSPOOLS AND SEEPAGE PITS.
(1) Except as provided in OAR 340-71401, construction of new cesspool sewage
disposal systems in Oregon is prohibited.
(2) Seepage pit sewage disposal systems may be used only to serve existing sewage
loads and replace existing failing seepage pit and cesspool systems on lots that
are inadequate in size to accommodate a standard system or other alternative
on-site sewage systems. A construction -installation permit allowing replacement
of the failing system shall not be issued if a sewerage system is both legally and
physically available, as described in OAR 340-71-160(5)(f).
(3) Construction Requirements:
(a) Each seepage pit shall be installed in a location to facilitate future
connection to a sewerage system when such facilities become available;
(b) Maximum depth of seepage pits shall be thirty-five (35) feet below
ground surface;
(c) The seepage pit depth shall terminate at least four (4) feet above the water
table.
(4) Notwithstanding the permit duration specified in OAR 340-71-160(9), a permit
issued pursuant to this rule may be effective for a period of less than one (1)
year from the date of issue if specified by the Agent.
340-71-340 HOLDING TANKS.
(1) Criteria for Approval. A holding tank requires a WPCF Permit. A WPCF
permit for a holding tank may be authorized by the Agent for holding tanks on
sites that meet all the following conditions:
(a) Permanent Use:
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(A) The site cannot be approved for installation of a standard
subsurface system; and
(B) No community or area -wide sewerage system is available or
expected to be available within five (5) years; and
(C) The tank is intended to serve a small industrial or commercial
building, or an occasional use facility such as a county fair or a
rodeo; and
(D) Unless otherwise allowed by the Department, the projected daily
sewage flow is not more than two hundred (200) gallons; and
(E) Setbacks as required for septic tanks can be met.
(b) Temporary Use:
(A) In an area under the control of a city or other legal entity
authorized to construct, operate, and maintain a community or
area -wide sewerage system, a holding tank may be installed
provided the application for permit includes a copy of a legal
commitment from the legal entity that within five (5) years from
the date of the application the legal entity will extend to the
property covered by the application a community or area -wide
sewerage system meeting the requirements of the Commission,
and provided further that the proposed holding tank will
otherwise comply with the requirements of these rules; or
(B) The tank is to serve a temporary construction site.
(2) General:
(a) No building may be served by more than one (1) holding tank;
(b) A single tax lot may be served by no more than one (1) holding tank
unless the holding tanks are under control of a municipality as defined in
Oregon Revised Statutes;
(3) Design and Construction Requirements:
(a)
(b)
Plans and specifications for each holding tank proposed to be installed
shall be submitted to the Agent for review and approval;
Each tank shall have a minimum liquid capacity of fifteen hundred
(1,500) gallons;
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DEPARTMENT OF ENVIRONMENTAL QUALITY
(c) Each tank shall:
0145-1518
Water Quality Program
(A) Comply with standards for septic tanks contained in OAR
340-73-025;
(B) Be located and designed to facilitate removal of contents by
pumping;
(C) Be equipped with both an audible and visual alarm, placed in a
location acceptable to the Agent, to indicate when the tank is
seventy-five (75) percent full. The audible alarm only may be
user cancelable;
(D) Have no overflow vent at an elevation lower than the overflow
level of the lowest fixture served;
(E) Be designed for antibuoyancy if test hole examination or other
observations indicate seasonally high groundwater may float the
tank when empty.
(4) Special Requirements. The application for permit shall contain:
(a) A copy of a contract with a licensed sewage disposal service company
which shows the tank will be pumped periodically, at regular intervals or
as needed, and the contents disposed of in a manner and at a facility
approved by the Department;
(b) Evidence that the owner or operator of the proposed disposal facility will
accept the pumpings for treatment and disposal.
(5) Inspection Requirements. Each holding tank may be inspected annually. An
annual compliance determination fee in accordance with the fee schedule in
OAR 340-71-140 shall be charged.
340-71-345 AEROBIC SYSTEMS.
(1) Criteria for Approval. Aerobic sewage treatment facilities may be approved for
a construction -installation permit provided all the following criteria are met:
(a) The facility to be served is a single family dwelling;
(b) Wastewater strength does not exceed the maximum limits for residential
strength wastewater;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(c) The aerobic sewage treatment facility (plant) is part of an approved
on-site sewage disposal system;
(d) The plant has been tested pursuant to the current version of the National
Sanitation Foundation (NSF) Standard No. 40, relating to Individual
Aerobic Wastewater Treatment Plants, and been found to conform with
Class I or Class II and other requirements of the standard. In lieu of NSF
testing, the Department may accept testing by another agency which it
considers to be equivalent;
(e) The property owner records in the county land title records, in a form
approved by the Department, an easement and a covenant in favor of the
State of Oregon:
(A) Allowing its officers, agents, employees and representatives to
enter and inspect, including by excavation, the aerobic sewage
treatment facility; and
(B) Acknowledging that proper operation and maintenance of the
plant is essential to prevent failure of the entire on-site sewage
disposal system; and
(C) Agreeing for himself and his heirs, successors and assigns, to
hold harmless, indemnify and defend the State of Oregon, its
officers, representatives, employees and agents for any and all
loss and damage caused by installation or operation of the
system; and
(D) Agreeing not to put the land to any conflicting use.
(2) The plant shall:
(a) Have a visual and audible alarm, placed at a location acceptable to the
Agent, which are activated upon an electrical or mechanical malfunction;
(b) Have a minimum rated hydraulic capacity equal to the daily sewage flow
or five hundred (500) gallons per day, whichever is greater;
(c) Have aeration and settling compartments constructed of durable material
not subject to excessive corrosion or decay;
(d) Have raw sewage screening or its equivalent;
(e) Have provisions to prevent surging of flow through the aeration and
settling compartments;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(f) Have access to each compartment for inspection and maintenance;
(g) Have provisions for convenient removal of solids;
(h) Be designed to prevent:
(A) Short circuiting of flow;
(B) Deposition of sludge in the aeration compartment;
(C) Excessive accumulation of scum in the settling compartment;
(D) The passage of untreated sewage into the disposal field if the
plant malfunctions.
(3) Disposal Field Sizing. Disposal fields serving systems employing aerobic
sewage treatment facilities shall be sized according to Tables 4 and 5 of these
rules. Where a NSF Class I plant is installed, the linear footage of disposal
trench installed may be reduced by twenty (20) percent, provided a full sized
standard system replacement area is available.
(4) Operation and Maintenance:
(a) The supply of parts must by locally available for the expected life of the
unit;
(b) The supplier of the plant shall be responsible for providing operation
training to the owner;
(c) The supplier of the plant shall provide the owner with an operation and
maintenance (O & M) manual for the specific plant installed;
(d) The owner shall remove excess solids from the plant at least once per
year, or more frequently if recommended by the O & M manual.
(5) Inspection Requirements. Each aerobic sewage treatment facility installed under
this rule shall be inspected by the Agent at least once per year (See OAR
340-71-260 (2)).
(6) Aerobic systems which serve commercial facilities, or which do not meet the
above requirements shall be permitted only by WPCF Permit. Operation and
maintenance requirements shall be established in the permit.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-360 DISPOSAL TRENCHES IN SAPROLITE.
(1) General Conditions for Approval. An on-site system construction -installation
permit may be issued for a system to serve a single family dwelling on a site
with soil shallow to saprolite provided requirements in either subsection (a) or
(b) of this section can be met.
(a) Slope does not exceed thirty (30) percent:
(A) The saprolite is sufficiently weathered so that it can be textured,
crushed, or broken with hand pressure to a depth of twenty-four
(24) inches and can be dug from a test pit wall with a spade or
other hand tool to a depth of forty-eight (48) inches; and
(B) Clay films or iron coatings with moist values of five (5) or less
and moist chromas of four (4) or more and/or organic coatings
with moist values of three (3) or less and moist chromas of two
(2) or more occur on fracture surfaces of the saprolite to a depth
of forty-eight (48) inches.
(b) Slope is in excess of thirty (30) percent but does not exceed forty-five
(45) percent:
(A) The saprolite is sufficiently weathered so that it can be textured,
crushed, or broken with hand pressure to a depth of twenty-four
(24) inches and can be dug from a test pit wall with a spade or
other hand tool to a depth of sixty (60) inches; and
(B) Clay films or iron coatings with moist values of five (5) or less
and moist chromas of four (4) or more and/or organic coatings
with moist values of three (3) or less and moist chromas of two
(2) or more occur on fracture surfaces of the saprolite to a depth
of sixty (60) inches.
(2) Construction Requirements.
(a)
Standard disposal trenches shall be installed where slope does not exceed
thirty (30) percent:
(A) Standard disposal trenches shall be installed at a minimum depth
of twenty-four (24) inches and a maximum depth of thirty (30)
inches below the natural soil surface and contain twelve (12)
inches of filter material and a minimum of twelve (12) inches of
native soil backfill.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Standard disposal trenches shall be sized at a minimum of one
hundred (100) linear feet per one hundred fifty (150) gallons
projected daily sewage flow.
(b) Seepage trenches shall be installed where slope is in excess of thirty (30)
percent but does not exceed forty-five (45) percent:
(A) Seepage trenches shall be installed at a minimum depth of thirty (30) inches and
at a maximum depth of thirty-six (36) inches below the natural soil surface and
contain a minimum of eighteen (18) inches of filter material and twelve (12)
inches of native soil backfill.
(B) Seepage trenches shall be sized at a minimum of seventy-five (75) linear feet per
one hundred fifty (150) gallons of projected daily sewage flow.
340-71400 GEOGRAPHIC AREA SPECIAL CONSIDERATIONS.
(1) River Road — Santa Clara Area, Lane County:
(a) Within the areas set forth in subsection (b) of this section the Agent may
issue either construction permits for new subsurface sewage disposal
systems or favorable reports of evaluation of site suitability to construct
systems under the following circumstances:
(A) The system complies with all rules in effect at the time the permit
is issued; and
(B) The system will not in itself contribute, or in combination with
other new sources after April 18, 1980, contribute more than
sixteen and seven -tenths (16.7) pounds nitrate -nitrogen per acre
per year to the local groundwater. The applicant shall assure
compliance with this condition by showing his ownership or
control of adequate land through easements or equivalent.
(b) Subsection (a) of this section shall apply to all of the following area
generally known as River Road — Santa Clara, and defined by the
boundary submitted by the Board of County Commissioners for Lane
County, which is bounded on the south by the City of Eugene, on the
west by the Southern Pacific Railroad, on the north by Beacon Drive, and
on the east by the Willamette River, and containing all or portions of
T16S, R4W, Sections 33, 34, 35, 36; T17S, R4W, Sections 1, 2, 3, 4,
10, 11, 12, 13, 14, 15, 22, 23, 24, 25; and T17S, R1E, Sections 6, 7,
18, Willamette Meridian;
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Water Quality Program
(c) This rule is subject to modification or repeal by the Commission on an
area -by -area basis upon petition by the appropriate local agency or
agencies. Such petition either shall provide reasonable evidence that
development using subsurface sewage disposal systems will not cause
unacceptable degradation of groundwater quality or surface water quality
or shall provide equally adequate evidence that degradation of ground-
water or surface water quality will not occur as a result of such
modification or repeal;
(d) Subsections (a) and (b) of this section shall not apply to any construction
permit application based on a favorable report of evaluation of site
suitability issued by the Agent pursuant to ORS 454.755(1)(b), where
such report was issued prior to the effective date of this rule.
(2) General North Florence Aquifer, North Florence Dunal Aquifer Area, Lane
County:
(a) Within the area set forth in subsection (2)(b) of this rule, the agent may
issue construction permits for new on-site sewage disposal systems or
favorable reports of evaluation of site suitability to construct individual or
community on-site sewage disposal systems under the following circum-
stances:
(A) The lot and proposed system shall comply with all rules in effect
at the time the permit or favorable report of site suitability is
issued; or
(B) The lot and proposed system complies with paragraph 2(a)(A) of
this rule, except for the projected daily sewage loading rates, and
the system in combination with all other previously approved
systems owned or legally controlled by the applicant shall be
projected by the Department to contribute to the local
groundwater not more than fifty-eight (58) pounds nitrate -
nitrogen NO3-N per year per acre owned or controlled by the
applicant.
(b) Subsection (2)(a) of this rule shall apply to all of the following area
hereby known as the General North Florence Aquifer of the North
Florence Dunal Area and is defined by the hydrologic boundaries
identified in the June 1982, 208 North Florence Dunal Aquifer Study,
which is the area bounded on the west by the Pacific Ocean; on the
southwest and south by the Siuslaw River; on the east by the North Fork
of the Siuslaw River and the ridge line at the approximate elevation of
four hundred (400) feet above mean sea level directly east of Munsel
Lake, Clear Lake and Collard Lake; and on the north by Mercer Lake,
Mercer Creek, Sutton Lake and Sutton Creek; and containing all or
SSRULEA (04-01-95) 71-98 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
portions of T17S, R12W, Sections 27, 28, 33, 34, 35, 36, and T18S,
T12W, sections 1, 2, 3, 4, 9, 10, 11, 12, 13, 14, 15, 16, 22, 23, 24, 25,
26, 27; W.M., Lane County, except that portion defined as the Clear
Lake Watershed more particularly described by OAR 340-71-460(6)(f).
(3) Lands Overlaying the Alsea Dunal Aquifer:
(a) Within the area set forth in subsection (3)(c) of this rule, the Agent may
issue a construction permit for a new on-site sewage disposal system or a
favorable report of evaluation of site suitability to construct a single
on-site system on lots that were lots of record prior to January 1, 1981;
or on lots in partitions or subdivisions that have received preliminary
planning, zoning, and on-site sewage disposal approval prior to January
1, 1981, providing one of the following can be met:
(A) At the time the permit or favorable report of site suitability is
issued the lot complies with OAR 340-71-100 through 340-71-
360 and OAR 340-71-410 through 340-71-520; or
(B) The lot is found through site evaluation not to comply with OAR
340-71-100 through 340-71- 360 and OAR 340-71-410 through
340-71-520, but does meet all of the following conditions when a
pressurized seepage bed is utilized:
(i) Groundwater levels shall not be closer than four (4) feet
from the ground surface or closer than three (3) feet from
the bottom of the seepage bed;
(ii) The seepage bed shall be constructed in accordance with
OAR 340-71-275(4) and (5);
(iii) The seepage bed shall be sized on the basis of two
hundred (200) square feet of bottom area per one hundred
fifty (150) gallons projected daily sewage flow;
(iv) Projected daily sewage flows shall be limited to not
more than three hundred seventy-five (375) gallons per
lot, except those lots which have a certificate of favorable
site evaluation which provides for a larger flow;
(v) All setbacks identified in Table 1 can be met, except that
lots of record prior to May 1, 1973, shall maintain a
minimum fifty (50) feet separation to surface public
waters;
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DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1525
Water Quality Program
(vi) Sufficient area exists on the lot to install a seepage bed
and a replacement seepage bed. The area reserved for
replacement may be waived pursuant to the exception in
OAR 340-71-150(4)(a)(B).
(C) The lot is found through site evaluation not to comply with OAR
340-71-100 through 340-71- 360 and OAR 340-71-410 through
340-71-520, but does meet all of the following conditions when a
conventional sand filter without a bottom is utilized:
(i) Groundwater levels shall not be closer than one (1) foot
from the ground surface and not closer than one (1) foot
from the bottom of the sand filter;
Sewage flows shall be limited to not more than three
hundred seventy-five (375) gallons per day per lot,
except those lots which have a certificate of favorable site
evaluation which provides for a larger flow;
(iii) The sand filter shall be sized at one (1) square foot of
bottom area for each gallon of projected daily sewage
flow;
(iv) The conventional sand filter without a bottom shall be
constructed in accordance with OAR 340-71-295(3);
(v) All setbacks identified in Table 1 can be met, except that
lots of record prior to May 1, 1973, shall maintain a
minimum fifty (50) feet separation to surface public
waters;
(vi) Sufficient area exists on the lot to install a bottomless
conventional sand filter and a replacement bottomless
conventional sand filter. The area for replacement may
be waived pursuant to the exception contained in OAR
340-71-150(4)(a)(B).
(b) Within the area set forth in subsection (3)(c) of this rule, for lots created
on or after January 1, 1981, and/or when the on-site system will serve a
commercial facility, the Agent may issue a construction permit for a new
on-site sewage disposal system or a favorable report of evaluation of site
suitability if it is determined that all rules of the Commission can be met;
(c) The Alsea Dunal Aquifer is defined as all the land bounded on the East
by Highway 101, the Pacific Ocean on the West, and from Driftwood
Beach Wayside South to the southern tip of the Alsea Bay Spit;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(d) If the results of groundwater monitoring in the Alsea Dunal Aquifer
indicate unacceptable levels of degradation or if it appears necessary or
desirable to pursue development of the aquifer as a source of drinking
water, sewage collection and off-site treatment and disposal facilities shall
be installed unless further study demonstrates that such facilities are not
necessary or effective to protect the beneficial use.
(4) Christmas Valley Townsite, Lake County:
(a) Within the area set forth in subsection (4)(b) of this rule, the agent may
consider the shallow groundwater table, if present, in the same manner as
a temporary water table when preparing and/or issuing site evaluation
reports and construction -installation permits;
(b) The Christmas Valley Townsite is defined as all land within the
Christmas Valley Townsite plat located within Sections 9, 10, 11, 14, 15
and 16 of Township 27 South, Range 17 East, Willamette Meridian, in
Lake County.
(5) Clatsop Plains Aquifer, Clatsop County:
The Clatsop Plains Groundwater Protection Plan, prepared by R.W. Beck and
Associates and adopted by Clatsop County, provides a basis for continued use of
on-site sewage disposal systems while protecting the quality of groundwater for
future water supplies. For the plan to be successful, the following components
must be accomplished:
(a) By not later than January 1, 1983, Clatsop County shall identify and set
aside aquifer reserve areas for future water supply development con-
taining a minimum of two and one half (2-1/2) square miles. The reserve
areas shall be controlled so that the potential for groundwater con-
tamination from nitrogen and other possible pollutants is kept to a
minimum;
(b) The Agent may issue construction installation permits for new on-site
sewage disposal systems or favorable reports of site evaluation to
construct on-site systems, within the area generally known as the Clatsop
Plains, which is bounded by the Columbia River to the North; the Pacific
Ocean to the west; the Necanicum River, Neawanna Creek, and County
Road 157 on the south; and the Carnahan Ditch-Skipanon River and the
foothills of the Coast Range to the east, providing:
(A) The lot or parcel was created in compliance with the appropriate
comprehensive plan for Gearhart (adopted by County Ordinance
80-3), Seaside (adopted by County Ordinance 80-10), Warrenton
SSRULEA (04-01-95) 71-101 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(adopted by County Ordinance 82-15), or the Clatsop County
plan adopted through Ordinance No. 79-10; and either
(B) The lot or parcel does not violate any rule of this Division; or
(C) Lot or parcel does not violate the Department's Water Quality
Management Plan or any rule of this Division, except the
projected maximum sewage loading rate would exceed the ratio
of four hundred fifty (450) gallons per one-half (1/2) acre per
day. The on-site system shall be either a sand filter system or a
pressurized distribution system with a design sewage flow not to
exceed four hundred fifty (450) gallons per day; or
(D) The Department may approve the use of standard on-site systems
to serve single family dwellings within planned developments or
clustered -lot subdivisions providing:
(i) The planned development or clustered -lot subdivision is
not located within Gearhart, Seaside, Warrenton, or their
urban growth boundaries; and
(ii) The lots do not violate any rule of this Division, except
the projected maximum sewage loading rate may exceed
the ratio of four hundred fifty (450) gallons per acre per
day; and
(iii) The Department is provided satisfactory evidence through
a detailed groundwater study that the use of standard
systems will not constitute a greater threat to groundwater
quality than would occur with the use of sand filter
systems or pressurized distribution systems.
(6) Within areas east of the Cascade Range where the annual precipitation does not
exceed twenty (20) inches, and after evaluating the site, the Agent may issue a
construction -installation permit authorizing installation of a standard system to
serve a single family dwelling, provided the requirements in subsections (6)(a)
and (b) of this rule are met:
(a) Minimum Site Criteria:
(A) The property is ten (10) acres or larger in size. The minimum
parcel size considered under this rule is designated by the
County, but in no event shall it be less than ten (10) acres;
(B) The slope gradient does not exceed thirty (30) percent;
SSRULEA (04-01-95) 71-102 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(C) The soils are diggable with a backhoe to a depth of at least
twenty-four (24) inches;
(D) The site is found to comply with the provisions of OAR 340-71-
220(1)(b,e,f,g,h, and i).
(b) Minimum Construction Requirements:
(A) The system shall contain not less than two hundred twenty-five
(225) linear feet of disposal trench for projected sewage flows not
exceeding four hundred fifty (450) gallons per day. Larger
sewage flows shall be sized on the basis of seventy-five (75)
linear feet per each one hundred fifty (150) gallons of projected
flow;
(B) The system shall be constructed and backfilled in compliance
with OAR 340-71-220: sections (3), (4), (5), (7), (8), (9), (10),
and (11) of this rule.
(c) At the discretion and request of the owner or the owner's authorized
representative, a single application may be submitted to the Agent for
both a site evaluation report and a construction -installation permit. The
application would include the sum of the fees for both activities, pursuant
to OAR 340-71-140(1)(a)(A) and OAR 340-71-140(1)(b)(A)(i), as well as
the following:
(A) Favorable land use compatibility statement from the appropriate
land use authority signifying that the proposed land use is
compatible with the Land Conservation and Development Com-
mission acknowledged comprehensive plan or complies with the
statewide planning goals;
(B) Property development plan acceptable to the Agent showing the
location of existing and proposed improvements, including the
locations of the dwelling and sewage disposal system;
(C) All other exhibits the Agent finds are necessary to complete the
application.
(d) The Agent may waive the pre -cover inspection for a system installed
pursuant to this section, provided the system installer submits the
following information to the Agent at the time construction of the system
is complete:
(A) A detailed and accurate as -built plan of the constructed system;
and
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0145-1529
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qualify Program
(B) A list of all material used in the construction of the system; and
(C) A written certification (on a form acceptable to the Department)
that the construction was in accordance with the permit and rules
of the Commission.
(7) Within areas east of the Cascade Range where the annual precipitation does not
exceed twenty (20) inches, the Agent may issue a construction -installation
permit authorizing installation of a standard system to serve a single family
dwelling, provided the requirements in subsections (7)(a) and (b) of this rule are
met. The Agent may waive the site evaluation for a single family dwelling
.provided:
(a) Minimum Site Criteria:
(A) The property is eighty (80) acres or larger in size. The minimum
parcel size considered under this rule is designated by the
County, but in no event shall it be less than eighty (80) acres;
(B) The separation distance between the proposed on-site system and
the nearest dwelling, other than that being served by the proposed
system, is at least one-quarter mile;
(C) The nearest property line to the proposed system is at least 100
feet, the nearest domestic water source is at least 200 feet, and
the nearest surface public water is at least 200 feet; and
(D) In the opinion of the Agent, sufficient topographical and soils
information, including but not limited to slope, terrain, landform,
and rock outcrops, is submitted with the application to determine
the property can be approved for on-site sewage disposal in
conformance with the purpose of these rules as stated in OAR
340-71-110.
(b) Minimum Construction Requirements:
(A) Sizing requirements of Tables 4 and 5 shall be followed as
closely as possible. In any case, the system shall contain not less
than two hundred twenty-five (225) linear feet of disposal trench
for projected sewage flows not exceeding four hundred fifty (450)
gallons per day. Larger sewage flows shall be sized on the basis
of seventy-five (75) linear feet per each one hundred fifty (150)
gallons of projected flow;
(B) The system shall be constructed and backfilled as closely as
possible to the requirements contained in OAR 340-71-220.
SSRULEA (04-01-95) 71-104 On -Site Disposal
0145-1530
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality - Program
(c) At the request of the owner or the owner's authorized representative, a
single application may be submitted to the Agent for both a site evalua-
tion report and a construction -installation permit. The application would
include the fee for a site evaluation, pursuant to OAR 340-71-140, as
well as the following:
(A) Favorable land use compatibility statement from the appropriate
land use authority signifying that the proposed land use is
compatible with the Land Conservation and Development Com-
mission acknowledged comprehensive plan or complies with the
statewide planning goals;
(B) Property development plan acceptable to the Agent showing the
location of existing and proposed improvements, including the
locations of the dwelling and sewage disposal system;
(C) All other exhibits the Agent finds are necessary to complete the
application;
(D) If the decision is made to waive the site evaluation, the fee will
be transferred to the permit.
(d) The Agent may waive the pre -cover inspection for a system installed pur-
suant to this section, provided the system installer submits the following
information to the Agent at the time construction of the system is
complete:
(A) A detailed and accurate as -built plan of the constructed system;
and
(B) A list of all material used in the construction of the system; and
(C) A written certification (on a form acceptable to the Department)
that the construction was in accordance with the permit and rules
of the Commission.
(e) The conditions for OAR 340-71-400(7) shall be set forth in an addendum
to the memorandum of agreement (contract) between the County and the
Department.
SSRULEA (04-01-95) 71-105 On -Site Disposal
0145-1531,
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-401 MID-MULTNOMAH COUNTY, CESSPOOL AND SEEPAGE PIT USE.
(1) This rule shall be applicable only within the area defined in Appendix B of the
document entitled Evaluation of Hearing Record for Proposal to Declare a
Threat to Drinldng Water in a Specifically Defined Area of Mid -Multnomah
County pursuant to ORS 454.275 et seq., February 6, 1986.
(2) Favorable site evaluation reports and new construction -installation permits for
cesspool and seepage pit sewage disposal systems may be issued within the area
defined in section (1) of this rule, provided all of the following conditions are
met:
(a) Construction of sewers and connection thereto is on schedule as defined
in the Mid -Multnomah County Sewer Implementation Plan, September
1985;
(b) The total waste load discharged into cesspool and seepage pit sewage
disposal systems within the affected area at any time does not exceed that
indicated by the EQC Benchmark Removal Rate line in Figure 4-1, of
Mid -Multnomah County Sewer Implementation Plan, September 1985,
based on the assumption that fifty-six thousand (56,000) single family
dwelling unit equivalent cesspool and seepage pit systems existed in the
affected area at the beginning of 1985;
(c) Sewers are not available to serve the proposed development. Connection
to sewers shall be made whenever practicable. Connection will be
deemed practicable if sewers are physically available as defined in OAR
340-71-160(5)(fl unless otherwise allowed by the Agent;
(d) Any land division or subdivision development that involves construction
of streets shall construct dry sewers at the time of development to
minimize costs and disruption when connection to a sewer becomes
possible. If in the judgment of the Agent construction of dry sewers is
not practicable, the land division or subdivision may be approved for
cesspools and seepage pits if funds in the amount of the cost of the
needed dry sewer construction is placed in an interest bearing escrow
account to be applied to construction of the sewers when appropriate
under the schedule for sewer construction by the local governments;
(e) Cesspool or seepage pit systems shall not be authorized on any lot that is
large enough to install a standard or other alternative on-site system;
(f) Site Criteria:
(A) The permanent water table is sixteen (16) feet or greater from the
surface;
SSRULEA (04-01-95) 71-106 On -Site Disposal
0145-1532
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Gravelly sand, gravelly loamy sand, or other equally porous
material occurs in a continuous five (5) foot deep stratum within
twelve (12) feet of the ground surface;
(C) A layer that limits effective soil depth does not overlay the gravel
stratum;
(D) The site is found to comply with the provisions of OAR
340-71-220(1)(e, f, and i).
(3) Construction Requirements:
(a) Each cesspool and seepage pit shall be installed in a location to facilitate
future connection to a sewerage system when such facilities become avail-
able;
(b) Maximum depth of cesspools and seepage pits shall be thirty-five (35)
feet below ground surface;
(c) The cesspool or seepage pit depth shall terminate at least four (4) feet
above the water table;
(d) Cesspool and seepage pit structures shall be of a design to assure that
collapse or cave-in will not occur.
(e) The provisions of OAR 340-71-220(1)(i) are met.
(4) Permits to repair or replace failing cesspool or seepage pit systems may be
issued if sewers are not available. Connection to sewers shall be made
whenever practicable. Connection will be deemed practicable if sewers are
physically available as defined in OAR 340-71-160(5)(fl unless otherwise
allowed by the Agent. The Agent may exercise judgment in determining
whether strict compliance with the requirements identified in section (3) of this
rule are reasonable.
(5) Notwithstanding the permit duration specified in OAR 340-71-160(9), a permit
issued pursuant to this rule may be effective for a period of less than one (1)
year from the date of issue if specified by the Agent.
(6) The Agent shall report to the Department of Environmental Quality at the end of
each calendar year on the number of cesspools and seepage pits removed, the
number of repair and replacement systems authorized, and the number of new
interim cesspool and seepage pit systems approved through on-site system and
WPCF permit issuance. The calculated number of single family dwelling unit
equivalent cesspools remaining in service shall at all times be less than or equal
to the number derived for that point in time based on fifty-six thousand (56,000)
SSRULEA (04-01-95) 71-107 On -Site Disposal
0145-1533
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
units in existence at the beginning of 1985, and the target percent removed
based on the benchmark removal rate as shown in Figure 4-1 of "Mid -
Multnomah County Sewer Implementation Plan", September 1985.
(7) For proposed new sewage loads in excess of five thousand (5000) gallons per
day, applications for site evaluation reports and construction permits must be
submitted to the Department of Environmental Quality. The permits shall be
issued pursuant to OAR 340, Divisions 14 and 45 only after the Agent and the
Department concur the provisions of subsection (2)(b) of this rule not are
violated.
340-71410 RURAL AREA CONSIDERATION
(1) Departure from any standard contained in subsections 340-71-220(1)(a) through
(h) may be granted by the Agent in certain rural zones provided:
(a) The County designates specific rural zoning classifications for purposes of
this rule;
(b) The minimum parcel size considered under this rule is designated by the
County, but in no event shall it be less than ten (10) acres;
(c) The parcel is an existing parcel that does not have an accessible area
approvable for a standard on-site system;
(d) The permit is for an on-site system designed to serve a single family
dwelling, or for a commercial facility with an equivalent or less sewage
flow permitted by the zone;
(e) The on-site sewage disposal system will function in a satisfactory manner
so as not to create a public health hazard, or cause pollution of public
waters;
(f) Requiring strict compliance with the standards contained in subsections
340-71-220 (1) (a) through (h), would in the judgment of the Agent, be
unreasonable, burdensome, or impractical due to special physical
conditions or cause.
(2) The Agent has the discretion to approve design and construction for either a
standard or alternative system.
SSRULEA (04-01-95) 71-108 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
340-71415 FORMAL VARIANCES.
0145-1534
Water Quality Program
(1) Variances from any rule or standard for on-site sewage systems, contained in
these rules, may be granted to applicants for permits by the Commission after a
hearing before a special variance officer. The variance officer shall make a
recommendation to the Commission for or against the variance.
(2) Variances from any rule contained in OAR 340, Division 71 may be granted to
applicants for permits by special variance officers appointed by the Director.
(3) No variance may be granted unless the Commission or a special variance officer
finds that:
(a) Strict compliance with the rule or standard is inappropriate for cause; or
(b) Special physical conditions render strict compliance unreasonable,
burdensome, or impractical.
(4) Applications.
(a) Applications shall be made to the Department or Agreement County as
appropriate. A separate application must be filed for each site considered
for a variance.
(b) Each application shall by accompanied by:
(A) A site evaluation report, unless waived by the variance officer; and
(B) Plans and specifications for the proposed system; and
(C) The appropriate fee; and
(D) Other information necessary for rendering a proper decision; and
(E) The application shall be signed by the property owner.
(5) An applicant for a variance under this rule is not required to pay the application
fee, if at the time of filing, the applicant:
(a) Is sixty-five (65) years of age or older; and
(b) Is a resident of the State of Oregon; and
(c) Has an annual household income, as defined in ORS 310.030, of $15,000
or less; and
(d) Has not previously applied under the provisions of this section.
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0145®1535
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71420 HARDSHIP VARIANCES.
(1) The Commissiori may grant variances from rules or standards pertaining to
on-site sewage disposal systems in cases of extreme and unusual hardship.
(2) The Commission may consider the following factors in reviewing an application
for a variance based on hardship:
(a) Advanced age or bad health of applicant.
(b) Need of applicant to care for aged, incapacitated or disabled relatives.
(c) Relative insignificance of the environmental impact of granting a
variance.
(3) Hardship variances granted by the Commission may contain conditions such as:
(a) . Permits for the life of the applicant.
(b) Limiting the number of permanent residents using the system.
(c) Use of experimental systems for specified periods of time.
(4) Before an application is considered for a hardship variance it must be denied for
a standard variance on the basis of technical rule considerations. At the time of
application, the applicant must designate on the application whether it is to be
considered for a hardship variance.
(5) Documentation of hardship must be provided before the application is referred
to the Commission for action.
(6) Department personnel shall strive to aid and accommodate the needs of
applicants for variances due to hardship.
340-71-425 VARIANCE OFFICERS.
(1) To qualify for appointment as a special variance officer after the effective date
of these rules an individual must:
(a) Have three (3) years full time experience in subsurface sewage disposal
methods since January 1, 1974; one (1) year of which shall have been in
Oregon; and
(b) Have attended one (1) or more seminars, workshops, or short courses
pertaining soils and their relationship to subsurface sewage disposal.
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014.5-1536
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(2) Agreement (contract) counties may request that a county staff member, meeting
the above qualifications, be appointed special variance officer. That staff
member, if appointed, would perform the Department's variance duties within
that county.
340-71430 VARIANCE HEARINGS.
(1) The variance officer shall hold a public information type hearing on each
variance application.
(2) The hearing shall be held in the county where the property described in the
application is located.
(3) Each variance shall be heard within thirty (30) days after receipt of a completed
application.
(4) A decision to grant or deny the variance shall be made in writing within thirty
(30) days after completion of the hearing. If the variance is granted, the
variance officer shall set forth in writing the specifications, conditions and
location of the system.
(5) The burden of presenting the supportive facts shall be the responsibility of the
applicant.
(6) The variance officer shall visit the site of the proposed system prior to
conducting the hearing.
(7) Except for hardship variances, granted variances shall run with the land.
340-71435 VARIANCE PERMIT ISSUANCE, INSPECTIONS, CERTIFICATE OF
SATISFACTORY COMPLETION.
(1) After a variance is granted the appropriate Agent shall be notified in writing.
(2) In nonagreement counties the Department shall issue system construction -installation
permits, perform necessary inspections and issue Certificates of Satisfactory Completion.
(3) In agreement counties, the county shall issue system construction installation permits,
perform necessary inspections and issue Certificates of Satisfactory Completion.
SSRULEA (04-01-95)
On -Site Disposal
0145-1.5 ri
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71440 VARIANCE APPEALS.
Decisions of variance officers to grant or deny a variance may be appealed to the Commission.
340-71-445 VARIANCE ADMINISTRATIVE REVIEW.
The Department may review all records and files of variance officers to determine compliance or
noncompliance with these rules.
340-71-450 EXPERIMENTAL SYSTEMS.
(1) Policy: Alternative technologies to standard on-site sewage systems are needed
in areas planned for rural or low density development. It is the policy of the
Commission to allow the Department to pursue a program of experimentation
for the purpose of obtaining sufficient data for the development of alternative
sewage disposal systems, which may benefit significant numbers of people
within Oregon.
(2) Permit Required: Without first obtaining a permit from the Department, no
person shall construct an experimental on-site sewage treatment and disposal
system.
(3) Application Procedures:
(a) Application for experimental systems shall be made on Department forms;
(b) The application shall be complete, signed by the owner and be
accompanied by the required fee;
(c) The application shall include detailed system design specifications and
plans and any additional information the Department considers necessary;
(d) The owner shall agree, in writing, to hold the State of Oregon, its
officers, employees, and agents harmless of any and all loss and damage
caused by defective installation or operation of the proposed system.
(4) Criteria For Approval: Sites may be considered for experimental system
permits where:
(a)
(b)
Soils, climate, groundwater, or topographical conditions are common
enough to benefit large numbers of people;
A specific acceptable backup alternative is available in the event of
system failure;
SSRULEA (04-01-95) 71-112 Ort -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(c) For absorption systems, soils in both original and system replacement
areas are similar;
(d) Installation of a particular system is necessary to provide sufficient data
sampling base;
(e) Zoning, planning, and building requirements allow system installation;
(f) A single family dwelling will be served;
(g) The system will be used on a continuous basis during the life of the test
project;
(h) Resources for monitoring, sample collection, and laboratory testing are
available;
(i) Legal and physical access by easement for construction inspections and
monitoring are available;
(j) The property owner records a Department approved affidavit which
notifies prospective property purchasers of the existence of an
experimental system;
(k) The parcel size is at least one (1) acre.
(5) Permit Conditions: The system installation permit shall:
(a) Specify method and manner of system installation, operation, and
maintenance;
(b) Specify method, manner, and duration of system testing and monitoring;
(c) Identify when and where system is to be inspected;
(d) Require that permit not be transferable;
(e) Require system construction and use within one (1) year of permit
issuance.
(6) Denial Appeal: The decision of staff to either issue or deny a permit may be
reviewed by the Director. The Director may affirm or reverse the decision.
(7) Inspection of Installed System:
(a) Upon completing construction for each inspection phase required under
the permit, the permit holder shall notify the Department;
SSRULEA (04-01-95)
71-113
On -Site Disposal
0143--1539
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(b) The Department may inspect construction to determine whether it
complies with permit conditions and requirements;
(c) After system installation is complete and complies with permit conditions,
a Certificate of Satisfactory Completion shall be issued.
(8) Repair or Replacement of System: If the Department finds the operation of the
system is unsatisfactory, the owner upon written notification, shall promptly
repair or modify the system, replace it with another acceptable system, or as a
last resort, abandon the system.
(9) System Monitoring: The system shall be monitored by the permittee in
accordance with a schedule contained in the permit. The Department may also
monitor the operation of the system, including collection of samples for
analysis.
340-71-460 MORATORIUM AREAS
(1) Whenever the Commission finds that construction of subsurface or alternative
sewage disposal systems should be limited or prohibited in an area, it shall issue
an order limiting or prohibiting such construction.
(2) The order shall be issued only after public hearing for which more than thirty
(30) days' notice is given.
(3) The order shall be a rule of this division which contains a general description of
the moratorium area. A more detailed description of the area, if needed, shall
be an appendix to these rules.
(4) No permit or site evaluation report shall be issued for construction of a new or
expanded system which would violate any order of the Commission issued pur-
suant to ORS 454.685.
(5) Criteria For Establishing Moratoriums: In issuing an order under this section
the Commission shall consider the factors contained in ORS 454.685(2).
(6) Specific Moratorium Areas: Pursuant to ORS 454.685, the Agent shall not issue
sewage system construction -installation permits or approved site evaluation
reports within the boundaries of the following areas of the state:
Lane County - Clear Lake Watershed of the North Florence Dunal Aquifer
Area, as follows: The area hereby known as the Clear Lake Watershed of the
North Florence Dunal Aquifer Area defined by the hydrologic boundaries
identified in the June 1982, 208 North Florence Dunal Aquifer Study which is
the area beginning at a point known as Tank One, located in Section One,
SSRULEA (04-01-95) 71-114 On -Site Disposal
0145-1540
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
Township 18 South, Range 12 West, of the Willamette Meridian, Lane County,
Oregon:
Run thence S. 67° 50' 51.5" E. 97.80 ft. to the True Point of Beginning;
Run thence S. 05° 40' 43.0" W.
1960.62 ft. to a point;
Run thence S. 04° 58' 45.4" W.
1301.91 ft. to a point;
Run thence S. 520 44' 01.0" W.
231.21 ft. to a point;
Run thence S. 15° 20' 45.4" W.
774.62 ft. to a point;
Run thence S. 31° 44' 14.0" W.
520.89 ft. to a point;
Run thence S. 00° 24' 43.9" W.
834.02 ft. to a point;
Run thence S. 07° 49' 01.8" W.
1191.07 ft. to a point;
Run thence S. 500 26' 06.3" W.
731.61 ft. to a point;
Run thence S. 02° 51' 10.5" W.
301.37 ft. to a point;
Run thence S. 360 37' 58.2" W.
918.41 ft. to a point;
Run thence S. 47° 12' 26.3" W.
1321.86 ft. to a point;
Run thence S. 72° 58' 54.2" W.
498.84 ft. to a point;
Run thence S. 85° 44' 21.3" W.
955.64 ft. to a point;
Which is N. 11 ° 39' 16.9" W. 5434.90 ft. from a point known as Green Two
(located in Section 13 in said Township and Range);
Run thence N. 58° 09' 44.1" W.
1630.28 ft. to a point;
Run thence N. 25° 23' 10.1" W.
1978.00 ft. to a point;
Run thence N. 16° 34' 21.0" W.
1731.95 ft. to a point;
Run thence N. 06° 13' 18.0" W.
747.40 ft. to a point;
Run thence N. 03° 50' 32.8" E.
671.51 ft. to a point;
Run thence N. 59° 33' 18.9" E.
1117.02 ft. to a point;
Run thence N. 590 50' 06.0" E.
2894.56 ft. to a point;
Run thence N. 480 28' 40.0" E.
897.56 ft. to a point;
Run thence N. 31' 29' 50.7" E.
920.64 ft. to a point;
Run thence N. 19° 46' 39.6" E.
1524.95 ft. to a point;
Run thence S. 76° 05' 37.1" E.
748.95 ft. to a point;
Run thence S. 570 33' 30.2" E.
445.53 ft. to a point;
Run thence S. 78° 27' 44.9" E.
394.98 ft. to a point;
Run thence S. 61° 55' 39.0" E.
323.00 ft. to a point;
Run thence N. 89° 04' 46.8" E.
249.03 ft. to a point;
Run thence S. 67° 43' 17.4" E.
245.31 ft. to a point;
Run thence S. 790 55' 09.8" E.
45.71 ft. to a point;
Run thence S. 830 59' 27.6" E.
95.52 ft. to a point;
Run thence N. 420 02' 57.2" E.
68.68 ft. to a point;
Run thence S. 800 41' 24.2" E.
61.81 ft. to a point;
Run thence S. 10047' 03.5" E.
128.27 ft. to the True Point of Beginning; and
containing all or portions of T17S, R12W, Sections 35 and 36; and T18S,
R12W, Sections 1, 2, 11 and 12; W.M., Lane County.
SSRULEA (04-01-95) 71-115 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
340-71-500 COMMUNITY SYSTEMS.
0145-1541
Water Quality Program
(1) Without first applying for and obtaining a construction -installation permit, no
person shall install a community on-site system.
(2) Proposed community systems with projected sewage flows greater than two
thousand five hundred (2,500) gallons per day shall have a WPCF permit prior
to construction and shall have plans reviewed and approved by the Department
prior to construction , unless that responsibility is specifically delegated to the
Agent.
(3) Plans for all community systems shall include operation and maintenance details
including details for financing system operation and maintenance.
(4) The site criteria for approval of community systems shall be the same as
required for standard subsurface systems contained in OAR 340-71-220 (1) , or
in the case of community alternative systems, the specific site conditions for that
system contained in rules: OAR 340-71-260 through 340-71-275; OAR 340-71-
290 through 340-71-305; OAR 340-71-315; and 340-71-345.
(5) Operation Responsibility:
(a) Responsibility for operation and maintenance of community systems shall
be vested in a municipality, a Homeowners Association, or an Associa-
tion of Unit Owners as defined in Oregon Revised Statutes;
(b) Unless otherwise required by permit, community systems shall be
inspected at least annually by the responsible entity.
340-71-520 LARGE SYSTEMS.
(1) Large systems require a WPCF permit. The Agent may authorize construction
of a large system provided the following design criteria are met.
(2) Special Design Requirements: Unless otherwise authorized by the Department,
large systems shall comply with the following requirements:
(a) Large system absorption facilities shall be designed with distribution to
the cells by means of pump(s) or siphon(s) ;
(b) The disposal area shall be divided into relatively equal units. Each unit
shall receive no more than thirteen hundred (1300) gallons of effluent per
day;
SSRULEA (04-01-95) 71-116 On -Site Disposal
0145-1542
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(c) The replacement (repair) disposal area shall be divided into relatively
equal units, with a replacement disposal area unit located adjacent to an
initial disposal area unit;
(d) Effluent distribution shall alternate between the disposal area units;
(e) Each system shall have at least two (2) pumps or siphons;
(f) The applicant shall provide a written assessment of the impact of the
proposed system upon the quality of public waters and public health.
(3) Plans and specifications for large systems shall be prepared by any competent
professional with education or experience in the specific technical field involved.
The professional may accept an assignment requiring education or experience
outside of his/her own field of competence provided he/she retains competent
and legally qualified services to perform that part of the assignment outside
his/her own field of competence, his/her client or employer approves this
procedure, and he/she retains responsibility to his/her client or employer for the
competent performance of the whole assignment.
(4) Construction Requirements:
(a) Construction shall be in substantial conformance with approved plans and
specifications and any terms of the permit issued by the Agent;
(b) After completion of the system the professional shall certify that the
system was installed in accordance with approved plans and specifi-
cations.
SSRULEA (04-01-95) 71-117 On -Site Disposal
0145--1543
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-71-600 SEWAGE DISPOSAL SERVICE
(1) No person shall perform sewage disposal services or advertise or represent
himself/herself as being in the business of performing such services without first
obtaining a license from the Department. Unless suspended or revoked at an
earlier date, a Sewage Disposal Service license issued pursuant to this rule
expires on July 1 next following the date of issuance. Beginning July 1 1996,
in order to be licensed, the applicant must pass a written examination to
demonstrate familiarization with the on-site rules found in OAR Chapter 340,
Divisions 71 and 73, or attend a Department approved training session. All
persons employed by the licensee who are involved in the construction or
installation of systems shall also pass the written test or attend the training
session and shall carry evidence of that on their person. The Department will
provide all persons, who pass the test or attend the training session, with a
wallet size card for this purpose. Retesting will be required every 5 years.
(2) Those persons making application for a sewage disposal service license shall:
(a) Submit a complete license application form to the Department for each
business; and
(b) File and maintain with the Department original evidence of surety bond,
or other approved equivalent security, in the penal sum of two thousand
five hundred dollars ($2,500) for each business; and
(c) Shall have pumping equipment inspected by the Agent annually if
intending to pump out or clean systems and shall complete the "Sewage
Pumping Equipment Description/Inspection" form supplied by the
Department. An inspection performed after January 1st shall be accepted
for licensing the following July 1st; and
(d) Submit the appropriate fee as set forth in subsection 340-71-140(1)(h) for
each business; and
(e) Pass the written examination or have attended a Department approved
training session; and
(f) If operating a septage pumping service, submit a copy of the past 12
months pumping records required by subsection (12)(d) of this rule.
(3) A Sewage Disposal Service license may be transferred or amended during the
license period to reflect changes in business name, ownership, or entity (i.e.,
individual, partnership, or corporation), providing:
SSRULEA (04-01-95) 71-118 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
(4)
0145-J544
Water Quality gra
(a) A complete application to transfer or amend the license is submitted to
the Department with the appropriate fee as set forth in OAR 340-71-
140(1)(h); and
(b) The Department is provided with a rider to the surety, or a new form of
security as required in subsection (2)(b) of this rule; and
(c) A valid Sewage Disposal Service license (not suspended, revoked, or
expired) is returned to the Department; and
(d) If there is a change in the business name, a new "Sewage Pumping
Equipment Description/Inspection" form for each vehicle is submitted to
the Department and
(e) No person who takes over a Sewage Disposal Service shall operate the
business until they have passed the written examination or attended the
Department approved training session.
The type of security to be furnished pursuant to OAR 340-71-600(2)(b) may be:
(a) Surety bond executed in favor of the State of Oregon on a form approved
by the Attorney General and provided by the Department. The bond
shall be issued by a surety company licensed by the Insurance Com-
missioner of Oregon. Any surety bond shall be so conditioned that it
may be cancelled only after forty-five (45) days notice to the Department,
and to otherwise remain in effect for not less than two (2) years following
termination of the sewage disposal service license, except as provided in
subsection (e) of this section; or
(b) Insured savings account irrevocably assigned to the Department, with
interest earned by such account made payable to the depositor; or
(c) Negotiable securities of a character approved by the State Treasurer,
irrevocably assigned to the Department, with interest earned on deposited
securities made payable to the depositor;
(d) Any deposit of cash or negotiable securities under ORS 454.705 shall
remain in effect for not less than two (2) years following termination of
the sewage disposal service license except as provided in subsection (e) of
this section. A claim against such security deposits must be submitted in
writing to the Department, together with an authenticated copy of:
(A) The court judgment or order requiring payment of the claim; or
(B) Written authority by the depositor for the Department to pay the
claim.
SSRULEA (04-01-95) 71-119 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
0145-1545
Water Quality Program
(e) When proceedings under ORS 454.705 have been commenced while the
security required is in effect, such security shall be held until final
disposition of the proceedings is made. At that time claims will be
referred for consideration of payment from the security so held.
(5) Each licensee shall:
(a) Be responsible for any violation of any statute, rule, or order of the
Commission or Department pertaining to his licensed business;
(b) Be responsible for any act or omission of any servant, agent, employee,
or representative of such licensee in violation of any statute, rule, or
order pertaining to his license privileges;
(c) Deliver to each person for whom he performs services requiring such
license, prior to completion of services, a written notice which contains:
(A) A list of rights of the recipient of such services which are
contained in ORS 454.705(2); and
(B) Name and address of the surety company which has executed the
bond required by ORS 454.705(1); or
(C) A statement that the licensee has deposited cash or negotiable
securities for the benefit of the Department in compensating any
person injured by failure of the licensee to comply with ORS
454.605 to 454.745 and with rules of the Environmental Quality
Commission.
(d) Keep the Department informed on company changes that affect the
license, such as business name change, change from individual to part-
nership, change from partnership to corporation, change in ownership,
etc.
(6) Misuse of License:
(a) No licensee shall permit anyone to operate under his license, except a
person who is working under supervision of the licensee;
(b) No person shall:
(A) Display or cause or permit to be displayed, or have in his
possession any license, knowing it to be fictitious, revoked,
suspended or fraudulently altered;
SSRULEA (04-01-95) 71-120 On -Site Disposal
0145-1546
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(B) Fail or refuse to surrender to the Department any license which
has been suspended or revoked;
(C) Give false or fictitious information or knowingly conceal a
material fact or otherwise commit a fraud in any license
application.
(7) Pumping and Cleaning Responsibilities:
(a) Persons performing the service of pumping or cleaning of sewage
disposal facilities shall avoid spilling of sewage while pumping or while
in transport for disposal.
(b) Any spillage of sewage shall be immediately cleaned up by the operator
and the spill area shall be disinfected.
(8) License Suspension or Revocation:
(a) The Department may suspend, revoke, or refuse to grant, or refuse to
renew, any sewage disposal service license if it finds:
(A) A material misrepresentation or false statement in connection with
a license application; or
(B) Failure to comply with any provisions of ORS 454.605 through
454.785, the rules of the Environmental Quality Commission or
an order of the Commission or Department; or
(C) Failure to maintain in effect at all times the required bond or
other approved equivalent security, in the full amount specified in
ORS 454.705; or
(D) Nonpayment by drawee of any instrument tendered by applicant
as payment of license fee.
(b) Whenever a license is suspended, revoked or expires, the licensee shall
remove the license from display and remove all Department identifying
labels from equipment. The licensee shall surrender the suspended or
revoked license, and certify in writing to the Department within fourteen
(14) days after suspension or revocation that all Department identification
labels have been removed from all equipment;
(c) A sewage disposal service may not be considered for re -licensure for a
period of at least one (1) year after revocation of its license;
(d) A suspended license may be reinstated, providing:
SSRULEA (04-01-95) 71-121 On -Site Disposal
01145-15117
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(A) A complete application for reinstatement of license is submitted
to the Department, accompanied by the appropriate fee as set
forth in OAR 340-71-140(1)(h); and
(B) The grounds for suspension have been corrected; and
(C) The original license would not have otherwise expired.
(9) Equipment Minimum Specifications:
(a) Tanks for pumping out of sewage disposal facilities shall comply with the
following:
(A) Have a liquid capacity of at least five hundred fifty (550) gallons.
EXCEPTION: Tanks for equipment used exclusively
for pumping chemical toilets not exceeding fifty (50)
gallons capacity, shall have a liquid capacity of at
least one hundred fifty (150) gallons.
(B) Be of watertight metal construction;
(C) Be fully enclosed;
(D) Have suitable covers to prevent spillage.
(b) The vehicle shall be equipped with either a vacuum or other type pump
which will not allow seepage from the diaphragm or other packing glands
and which is self priming;
(c) The sewage hose on vehicles shall be drained, capped, and stored in a
manner that will not create a public health hazard or nuisance;
(d) The discharge nozzle shall be:
(A) Provided with either a camlock quick coupling or threaded screw
cap;
(B) Sealed by threaded cap or quick coupling when not in use;
(C) Located so that there is no flow or drip onto any portion of the
vehicle;
(D) Protected from accidental damage or breakage.
(e) No pumping equipment shall have spreader gates;
SSRULEA (04-01-95) 71-122 On -Site Disposal
0145-1548
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(f) Each vehicle shall at all times be supplied with a pressurized wash water
tank, disinfectant, and implements for cleanup;
(g) Pumping equipment shall be used for pumping sewage disposal facilities
exclusively unless otherwise authorized in writing by the Agent;
(h) Chemical toilet cleaning equipment shall not be used for any other
purpose.
(10) Equipment Operation and Maintenance:
(a) When in use, pumping equipment shall be operated in a manner so as not
to create public health hazards or nuisances;
(b) Equipment shall be maintained in a reasonably clean condition at all
times.
(11) Vehicles shall be identified as follows:
(a) Display the name or assumed business name on each vehicle cab and on
each side of a tank trailer:
(A) In letters at least three (3) inches in height; and
(B) In a color contrasting with the background.
(b) Tank capacity shall be printed on both sides of the tank:
(A) In letters at least three (3) inches in height; and
(B) In a color contrasting with the background.
(c) Labels issued by the Department for each current license period shall be
displayed at all times at the front, rear, and on each side of the "motor
vehicle" as defined by United States Department of Transportation
Regulations, Title 49 U.S.C.
(12) Disposal of Septage. Each licensee shall:
(a) Discharge no septage upon the surface of the ground unless approved by
the Department in writing;
(b) Dispose of septage only in disposal facilities approved by the Department;
(c) Possess at all times during pumping, transport or disposal of septage,
origin -destination records for sewage disposal services rendered;
SSRULEA (04-01-95)
71-123
On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY
01,15-15�9
Water Qualify Progrann
(d) Maintain on file complete origin -destination records for sewage disposal
services rendered. Origin -Destination records shall include:
(A) Source of septage on each occurrence, including name and
address;
(B) Specific type of material pumped on each occurrence;
(C) Quantity of material pumped on each occurrence;
(D) Name and location of authorized disposal site, where septage
was deposited on each occurrence;
(E) Quantity of material deposited on each occurrence.
(e) Transport septage in a manner that will not create a public health hazard
or nuisance;
(f) Possess a current septage management plan, approved by the Department.
The plan shall be kept current, with any revisions approved by the
Department before implementation;
(g) Comply with the approved septage management plan, and the septage
management plan approval letter issued by the Department.
340-71-605 IMPLEMENTATION DATE OF RULE MODIFICATIONS.
OAR 340-71-115 and 340-71-130(2) become effective immediately upon filing with the Secretary of
State. OAR 340-71-140(6) takes effect on October 7, 1994. Unless otherwise specified in the
individual rule, all other rule modifications become effective April 1, 1995. Until these rule
modifications become effective, the existing rules remain in effect.
SSRULEA (04-01-95) 71-124 On -Site Disposal
0145-1550
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qualify Program
TABLE 1
Minimum Separation Distances
SSRULEA (04-01-95) 71-125 On -Site Disposal
From
Firm Septic Tank and
Sewage Disposal
Other Treatment Unita,
Items Requiring Setback
Area Including
Effluent Sewer and
Replacement Area
Diatn"bution Unita
1. Groundwater Supplies.
100'
50'
2. Temporarily Abandoned Wells.
100'
50'
3. Springs:
• Upgradient.
50'
50'
• Downgradient.
100'
50'
"4. Surface Public Waters:
• Year round.
100'
50'
• Seasonal.
50'
50'
5. Intermittent Streams:
• Piped (watertight not less than 25' from
any part of the on-site system).
20'
20'
• Unpiped.
50'
50'
6. Groundwater Interceptors:
• On a slope of 3% or less.
20'
10'
• On a slope greater than 3%:
• Upgradient.
10'
5'
• Downgradient.
50'
10'
7. Irrigation Canals:
• Lined (watertight canal).
25'
25'
• Unlined:
• Upgradient.
25'
25'
• Downgradient.
50'
50'
8. Cuts Manmade in Excess of 30 Inches (top of
downslop cut):
• Which Intersect Layers that Limit Effective
Soil Depth Within 48 Inches of Surface.
• Which Do Not Intersect Layers that Limit
50'
25'
Effective Soil Depth.
25'
10'
9. Escarpments:
• Which Intersect Layers that Limit Effective
Soil Depth.
50'
10'
• Which Do Not Intersect Layers that Limit
Effective Soil Depth.
25'
10'
10. Property Lines.
10'
5'
11. Water Lines.
10'
10'
12. Foundation Lines of any Building, Including
Garages and Out Buildings.
10'
5'
13. Underground Utilities.
10'
—
This does not prevent stream crossings of pressure effluent
sewers.
SSRULEA (04-01-95) 71-125 On -Site Disposal
0145-1551
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
TABLE 2
Quantities of Sewage Flows
Type of Establishment
Column 1
Gallons Per Day
Column 2
Minimum Gallons
Per Establishment
Per Day
Airports
5
(per passenger)
150
Bathhouses and s imming pools
10
(per person)
300
Camps: (4
persons per
campsite, where
applicable)
Campground with central comfort stations
35
(per person)
700
With flush toilets, no showers 25 (per person)
500
Construction camps — semi-permanent 50 (per person)
1000
Day camps — no meals served 15 (per person)
300
Resort camps (night and day) with limited plumbing 50 (per person)
1000
Luxury camps 100 (per person)
2000
Churches
5
(per seat)
150
Country clubs
100
(per resident member)
2000
Country clubs
25
(per non-resident member present)
—
Dwellings:
Boarding houses
150
(per bedroom)
600
Boarding houses — additional for non-residental 10 (per person)
boarders
—
Rooming houses 80 (per person)
500
Condominiums, Multiple family dwellings — including 300 (per unit)
apartments
900
Single family dwellings 300 (not exceeding 2 bedrooms)
450'
Single family dwellings — with more than 2 bedrooms 75 (for third & each succeeding bed-
room)
450
Factories (exclusive of industrial wastes — with shower facilities)
35
(per per per shift)
300
Factories (exclusive of industrial wastes — without shower facilities)
15
(per person per shift)
150
Hospitals
250
(per bed space)
2500
Hotels with private baths
120
(per room)
600
Hotels without private baths
100
(per room)
500
Institutions other than hospitals
125
(per bed space)
1250
Laundries — self-service
500
(per machine)
2500
Mobile home parks
250
(per space)
750
Motels — with bath, toilet, and kitchen wastes
100
(per bedroom)
500
Motels — without kitchens
80
(per bedroom)
400
Picnic Parks — toilet wastes only
5
(per picnicker)
150
Picnic Parks — with bathhouses, showers, and flush toilets
10
(per picnicker)
300
Restaurants
40
(per seat)
800
Restaurants — single -service
2
(per customer)
300
Restaurants — with bars and/or lounges
50
(per seat)
1000
Schools:
100
(per person)
3000
rBoarding
hout gyms, cafeterias, or showers 15 (per person)
450
h yms, cafeterias and showers 25 (per person)
750
h cafeteria, but without gyms or showers 20 (per person)
600
Service Stations
10
(per vehicle served)
500
Swimming pools and bathhouses
10
(per person)
300
Theaters:
Movie
5
(per seat)
300
Drive -In 20 (per car space)
1000
Travel trailer parks — without individual water and sewer hookups
50
(per space)
300
Travel trailer parks — with individual water and sewer hookups
100
(per space)
500
Workers:
Construction — as semi-permanent camps 1
50
(perperson)
1000
Day — at schools and offices 15 (per shift)
150
' Except as otherwise provided in these rules.
SSRULEA (04-01-95) 71-126 On -Site Disposal
0145-15'52
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
ASL
70
M
50
40
30
20
10
TABLE 3
Slope, Effective Soil Depth Relationship
0 5 10 15 20 25 30' 35
Percent Slope
" When slope exceeds 30 percent, rules on steep slope systems apply. (Refer to OAR 340-71-310.)
SSRULEA (04-01-95) 71-127 On -Site Disposal
0145-°1553
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
TABLE 4
Slope, Effective Soil Depth Relationship
Minimum length of disposal trench (linear feet) required per one hundred fifty (150) gallons
projected daily sewage flow determined from soil texture versus effective soil depth.
Effective Soil Depth
Soil Group
A
B
C
18" to Less than 24"
125
150
175
24" to Less than 36"
100
125
150
36" to Less than 48
75
100
125
48" or more
50
75
125
" Soil Group A — Sand, Loamy Sand, Sandy Loam.
Soil Group B — Sandy Clay Loam, Loam, Silt Loam, Silt, Clay Loam.
Soil Group C — Silty Clay Loam, Sandy Clay, Silty Clay, Clay.
TABLE 5
Slope, Effective Soil Depth Relationship
Minimum length of disposal trench (linear feet) required per one hundred fifty (150) gallons
projected daily sewage flow determined from soil texture versus depth to temporary
groundwater.
Soil Group
Depth to Temporary Groundwater
A
B
C
24" to Less than 48"
100
125
150
48" or More
50
75
125
" Soil Group A — Sand, Loamy Sand, Sandy Loam.
Soil Group B — Sandy Clay Loam, Loam, Silt Loam, Silt, Clay Loam.
Soil Group C — Silty Clay Loam, Sandy Clay, Silty Clay, Clay.
SSRULEA (04-01-95) 71-128 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
TABLE 7
USDA Soil Classification Sizes of Soil Separates
Sieve Sizes I Millimeters
Clay
.882
Silt
2H .058
Very Fine Sand
200
Fine Sand
Medium Sand
Coarse Sand
Very Coarse Sand
Fine Gravel
075
4 4.75
318" 9.5
Coarse Gravel
Cobbles
SSRULEA (04-01-95) 71-130 On -Site Disposal
0145-1556
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
TABLE 8
Minimum Separation Distances for
Nonwater-Carried Waste Disposal Facilities
SSRULEA (04-01-95) 71-131 On -Site Disposal
Self -Contained
Unsealed Earth Type Privies,
Nonwater-Carried
Gray Water Waste Disposal
Waste Disposal
Sump and Seepage Chambers
Groundwater supplies includ-
50'
100'
ing springs and cisterns
Surface public waters, exclud-
50'
100'
ing intermittent streams
Intermittent streams
50'
50'
Property line
25'
25'
SSRULEA (04-01-95) 71-131 On -Site Disposal
0145-155`
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
SSRULEA (04-01-95)' 71-132 On -Site Disposal
0145-1.K58.
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-73-025 TANK CONSTRUCTION.
The following construction requirements shall apply to all holding, dosing, septic, and dosing
septic tanks manufactured for use in Oregon unless specifically exempted by other portions of
these rules:
(1) Compartments: Tanks may have single or multiple compartments. Multiple
compartment tanks shall comply with the following:
(a) The first compartment shall have a minimum liquid capacity of not
less than two-thirds (2/3) of the total required liquid capacity, as
measured from the invert of the outlet fitting;
(b) Each compartment shall have access provided by a manhole having not
less than eighteen (18) inches across its shortest dimension unless
otherwise approved by the Department. The manhole cover shall not
weigh more than seventy-five (75) pounds. All tanks shall be con-
structed to accommodate watertight risers per OAR 340-71-220(3)
(b)(C). Tank lids shall be constructed with or provided with a
durable, non -degradable, resilient gasket, the purpose of which is to
restrict access to vectors and vermin and to control odors and retard
infiltration;
(c) No compartment shall have an inside horizontal dimension of less
than twenty-four (24) inches;
(2) Liquid Depth: The liquid depth of any compartment shall be at least thirty
(30) inches. Liquid depths greater than seventy-two (72) inches shall not be
considered in determining the working liquid capacity, except for tanks
greater than 3,000 gallons capacity.
(3) Watertightness: After installation, all tanks shall be watertight. Each tank
shall be water tested by filling to a point at least two (2) inches above the
point of riser connection to the top of the tank. During the test there shall
be no more than a one (1) gallon leakage over a 24 hour period.
(4) In the case where the tank manufacturer does not install and/or seal the tank
at the job site, the manufacturer shall provide bonding and sealing agents and
instruction manual with the tank.
(5) Structural: All tanks shall be capable of supporting an earth load of at
least three hundred (300) pounds per square foot when the maximum cover-
age does not exceed three (3) feet. Tanks installed with more than three (3)
feet of cover shall be reinforced to support the additional load. Lateral load
shall be 62.4 pcf of equivalent fluid pressure (EFP.) Tanks shall be capable
of withstanding long-term external hydrostatic loads in addition to soil loads.
Internal hydrostatic pressures shall be omitted to allow for septage pumping
SSRULEB (04-0I-95) 73-I On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
during critical groundwater conditions. A 2,500 pound wheel load concen-
trated over the critical elements of the tank shall also be considered.
(6) The inlet and outlet fittings shall be of Schedule 40 P.V.C. plastic, Schedule
40 ABS plastic, or other materials approved by the Department, with a mini-
mum diameter of four (4) inches:
(a) The distance between the inlet and outlet fittings shall be equal to, or
greater than, the liquid depth of the tank;
(b) The inlet and outlet fittings, where applicable, shall be located at
opposite ends of the tank. The inlet must be readily accessible by
way of the service access or other means approved by the Department
in the design of the tank. They shall be attached in a watertight
manner approved by the Department;
(c) The inlet fitting shall be a "sanitary tee" extending at least six (6)
inches above and at least twelve (12) inches below the normal high
and low liquid levels.
(d) The outlet fitting, holes or ports provided in a vault or outlet filtering
device shall be positioned to withdraw effluent horizontally from the
clear zone, at an elevation measured from the inside bottom of the
tank 65 to 75 percent of the lowest operating liquid depth. The net
area of the ports shall be not less than 6 square inches. The outlet
fitting shall extend at least six (6) inches above the highest normal
liquid depth in order to provide scum storage. When the tank is used
as a holding or dosing tank, the outlet fitting shall be provided with a
watertight plug, or omitted;
(e) Ventilation shall be provided through the fittings by means of a two
(2) inch minimum space between the underside of the top of the tank
and the top of the inlet "tee" fitting;
(f) The invert of the inlet fitting shall be not less than one (1) inch and
preferably three (3) inches above the invert of the outlet fitting, or the
highest normal liquid level;
(g) A convenient means of monitoring sludge and scum accumulation shall
be provided, with access extending to ground level;
(h) The tank manufacturer shall provide with each fitting a rubber or
neoprene rubber gasket meeting ASTM Specification C-564, or an ap-
propriate coupler which the Department determines will provide a
watertight connection between the fittings and the building and effluent
sewer pipes;
SSRULEB (04-01-95) 73-2 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Qadiv Program
(i) Manufacturer shall provide a method to attach a specified type of riser
to the tank in a watertight manner.
(7) At least ten (10) percent of the inside volume of the tank shall be above
liquid level to provide scum storage and reserve .
(8) In tanks with more than one (1) compartment, a four (4) inch diameter (min-
imum) "tee" fitting shall be placed in each common compartment wall, us-
ing the same specifications as required for the outlet fitting. The invert of
this "tee" fitting shall be at the same elevation as the outlet "tee". Access
ports and risers shall be provided for inspection and maintenance.
(9) Except as provided in 73-026, tanks shall be constructed of concrete, fiber-
glass, or other noncorrosive materials approved by the Department.
(a) Precast concrete tanks shall have a minimum wall, compartment, and
bottom thickness of two and one-half (2-1/2) inches, and shall be
adequately reinforced. The top shall be at least four (4) inches thick;
(b) Cast -in-place tanks shall be designed by a civil/structural engineer to
the requirements of these rules and the tank construction shall be
certified by the designer or qualified representative. A structural
permit from the Building Codes Division or the municipality with
jurisdiction (as defined in ORS 456.750(5)) is required when cast -in-
place concrete tanks are used;
(c) Tanks made of other noncorrosive materials shall be constructed to
provide structural integrity to meet the requirements of sections (3),
(4) and (5) of this rule;
(10) All prefabricated tanks shall be marked on the uppermost tank surface over
the outlet with the liquid capacity of the tank, the burial depth limit, date of
manufacture, and either the manufacturer's full business name or the number
assigned by the Department.
(11) Each commercial manufacturer of prefabricated tanks shall provide two (2)
complete sets of plans and specifications, prepared by a registered pro-
fessional engineer licensed to practice in Oregon, to the Department for
review and approval. Plans submittal shall include the structural analysis,
calculation of total gallons, operating gallons, gallons per inch, and
buoyancy, including predetermined countermeasures.
(12) Each commercial manufacturer of prefabricated tanks shall provide the
Department with written certification that tanks for use in on-site sewage
disposal systems in the State of Oregon will comply with all requirements of
this rule.
SSRULEB (04-01-95) 73-3 On -Site Disposal
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(13) An installation manual, on waterproof paper, shall be provided by the manu-
facturer with each tank distributed. It shall describe proper installation of
the tank, riser(s) and lid, pipe connections, testing procedures, backfill, and
any special precautions or limitations.
340-73-026 SEPTIC TANKS.
(1) Septic tanks shall be constructed of concrete, fiberglass, steel, or other non-
corrosive materials approved by the Department. Steel septic tanks shall be not
less than twelve (12) gauge or thicker steel. They shall be coated inside and out
with asphalt or other protective coatings, meeting the most current American
National Standards Institute UL 70 standard, Sections 25 through 43, or other
coatings of equal or better performance approved by the Department.
(2) The outlet of a septic tank serving a commercial facility shall be equipped with
an effluent filter or treatment device meeting the requirements of OAR 340-73-
056, complete with a service riser that meets all the requirements of these rules.
340-73-030 DOSING SEPTIC TANK.
(1) A dosing septic tank may discharge effluent with a pump or dosing siphon
from the clear zone at the outlet end of the tank. These may be considered
by the Department for equipment approval for installations where the design
flow does not exceed 600 gallons per day.
(2) Special Configuration:
(a) The minimum total primary volume of the tank shall be 1,100 gallons
for flows <_ 450 gallons per day and 1,500 gallons for flows up to 600
gallons per day;
(b) The minimum submerged volume at the lowest operating liquid level
shall ensure optimum surge capacity, reserve storage capacity, sludge
and scum capacity, and hydraulic retention time ;
(c) Unless otherwise authorized by the Department, liquid levels shall be
controlled so that no more than twenty (20) percent of the projected
daily sewage flow is discharged each cycle; except that for sand filters
the discharge shall be no more than ten (10) percent per cycle;
(d) All apparatus shall be constructed and installed to facilitate ease of
service without having to alter any other component;
SSRULEB (04-01-95) 73-4 On -Site Disposal
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(e) Besides the requirements in 340-73-025(13), the installation manual
shall describe the installation of pump or siphon, piping, valves,
controls, and wiring to manufacturer's specifications and these rules;
340-73-035 DISTRIBUTION BOXES.
(1) Distribution Boxes shall be constructed of concrete, fiberglass, or other
materials acceptable to the Department.
(2) Distribution boxes shall be constructed of durable, watertight materials,
resistant to deterioration, and be designed to accommodate watertight con-
nections for the effluent sewer and/or header pipes. The top, walls, and
bottom of concrete distribution boxes shall be at least one and one-half (1-
1/2) inches thick.
(3) The invert elevation of all outlets shall be the same, and shall be at least two
(2) inches below the inlet invert.
(4) Each distribution box shall be provided with a sump extending at least two
(2) inches below the invert of the outlets.
(5) Distribution box covers shall be marked with the manufacturer's full
business name, or number assigned by the Department.
(6) Each manufacturer shall provide the Department with complete, detailed
plans and specifications of the distribution box, and shall certify, in writing,
that distribution boxes manufactured for use in on-site sewage systems in
Oregon will comply with all requirements of this rule.
340-73-040 DROP BOXES.
(1) Drop boxes shall be constructed of concrete, fiberglass, or other materials
acceptable to the Department.
(2) Drop boxes shall be constructed of durable, watertight materials, resistant to
deterioration, and be designed to accommodate watertight connections for
the effluent sewer and/or header pipes. The top, walls, and bottom of
concrete drop boxes shall be at least one and one-half (1-1/2) inches thick.
(3) The inverts of the inlet and overflow port shall be at the same elevation.
The invert of the header pipe port(s) leading to the disposal trench(es) shall
be six (6) inches below the inlet invert.
(4) Drop box covers shall be marked with the manufacturer's full business
name, or number assigned by the Department.
SSRULEB (04-01-95) 73-5 On -Site Disposal
0115'--IU63
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(5) Each manufacturer shall provide the Department with complete, detailed
plans and specifications of the drop box, and shall certify, in writing, that
drop boxes manufactured for use in on-site sewage disposal systems in
Oregon will comply will all requirements of this rule.
340-73-041 FILTER FABRIC.
Filter Fabric
340-73-041 Except as otherwise allowed by the Department on a case-by-case basis, filter fabric
used within on-site systems in Oregon shall meet the following specifications:
(1) Material synthetic fabric, either spunbonded or woven.
(2) Burst Strength, psi — not less than 25 psi.
(3) Air Permeability, cfm per sq. ft. — not less than 500.
(4) Water Flow Rate — not less than 500 gpm per sq. ft. at 3 inches of head.
(5) Surface Reaction to Water — Hydrophilic.
(6) Equivalent Opening Size — 70 to 100 sieve.
(7) Chemical Properties:
(a) Non -biodegradable.
(b) Resistant to acids and alkalies within a pH range of 4 to 10.
(c) Resistant to common solvents.
340-73-045 DIVERSION VALVES.
(1) Diversion valves shall be constructed of durable material, corrosion -
resistant, watertight, and designed to accommodate the inlet and outlet pipes,
in a secure and watertight manner.
(2) Diversion valves shall be constructed with access to finished grade, adequate
in size to provide for ease of operation and service of valve.
(3) Each manufacturer shall provide the Department with complete, detailed
plans and specifications of the diversion valve, including an instruction
manual, and shall certify, in writing, that diversion valves manufactured for
SSRULEB (04-01-95) 73-6 On -Site Disposal
0145-1564
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
use in on-site sewage disposal systems in Oregon will comply with all re-
quirements of this rule.
340-73-050 DOSING TANKS.
(1) Each dosing tank employing one (1) or more pumps shall have a minimum
liquid capacity equal to the projected daily sewage flow for flows up to
twelve hundred (1200) gallons per day. The Department may use its
discretion in sizing dosing tanks when the projected daily sewage flow is
greater than twelve hundred (1200) gallons per day. The liquid capacity
shall be as measured from the invert elevation of the inlet fitting.
(2) Each dosing tank shall be provided with an access manhole and a manhole
cover, both having a minimum horizontal measurement of eighteen (18) inches.
(3) Each dosing tank proposed to serve a commercial facility containing more
than one (1) pump or siphon shall be provided with one or more manhole
access es that provide adequate area to construct, install, service, and
operate the equipment in accordance with provision of these rules.
(4) Besides meeting the requirements in OAR 340-73-025(13), the installation
manual shall describe the installation of pump or siphon, piping, valves,
controls, and wiring to manufacturer's specifications.
(5) Dosing tanks with siphons shall be designed and sized for each specific
project. The tank manufacturer shall specify the type or model of siphon,
screen, and related apparatus to be used with that tank.
(6) The inlet fitting shall extend below the lowest operating level of the pump or
siphon.
340-73-055 DOSING ASSEMBLIES: EFFLUENT PUMPS, CONTROLS AND ALARMS,
AND DOSING SIPHONS.
(1) Design and equipment shall emphasize ease of maintenance and longevity
and reliability of components, and shall be proven suitable by operational
experience, test, or analysis suitable to the Department.
(2) An easy means of electrical and plumbing disconnect shall be provided. All
apparatus shall be constructed and installed to facilitate ease of service
without having to alter any other component.
(3) Component materials shall be durable and corrosion resistant such as Type
316 stainless steel, suitable plastics, or 85-5-5-5 bronze.
SSRULEB (04-0I-95) 73-7 On -Site Disposal
0145-1565
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(4) Pumps, Siphons, Controls, and Alarms: All pumps, siphons, controls and
related apparatus shall be field tested under working conditions and found to
operate and perform satisfactorily in order to be considered in compliance
with these rules. Electrical components used in on-site sewage disposal
systems shall comply with State of Oregon Electrical Code, and the
following provisions:
(a) Motors shall be continuous -duty, with overload protection;
(b) Pumps shall have durable impellers of bronze, cast iron, or other
materials approved by the Department;
(c) Submersible pumps shall be provided with an easy, readily accessible
means of electrical and plumbing disconnect, and a noncorrosive
lifting device as a means of removal for servicing;
(d) Except where specifically authorized in writing by the Agent, the
pump or siphon shall be placed within a corrosion -resistant screen that
extends above the maximum effluent level within the pump chamber.
The screen shall have at least twelve (12) square feet of surface area,
with one-eighth (1/8) inch openings. The use of a screen is not required
if the dosing assembly is preceded by a tank with an effluent filter;
(e) Pumps shall be automatically controlled by float switches with a
minimum rating of twelve (12) amps at one hundred fifteen (115) volts
A.C. or by a Department approved equivalently reliable switching
mechanism. The switches shall be installed so that no more than
twenty (20) percent of the projected daily sewage flow is discharged
each cycle, unless otherwise authorized by the Agent. The pump
"off" level shall be set to maintain the liquid level above the top of
the pump or to the pump manufacturer's specifications;
(f) An audible and visual high water level alarm with manual silence
switch shall be located in or near the building served by the pump.
The audible alarm only may be user cancelable. The switching mecha-
nism controlling the high water level alarm shall be located so that at
time of activation the tank has one-third (1/3) of its capacity remaining
for effluent storage. Commercial applications shall provide at least 6
hours of reserve storage capacity based on projected daily flows;
(g) When a system has more than one (1) pump, the Department may re-
quire they be wired into the electrical control panel to function
alternately after each pumping cycle. If either pump should fail the
other pump will continue to function, while an audible (user can-
celable) and visual alarm (not user cancelable) indicating pump mal-
function will activate. A cycle counter shall be installed in the
electrical control panel for each pump;
SSRULEB (04-01-95) 73-8 On -Site Disposal
Y
014 5-1 U66
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(h) All pump installations shall be designed with adequate sludge storage
area below the effluent intake level of the pump;
(i) All commercial systems with a design flow greater than 600 gallons
shall be constructed in duplex (two or more alternating pumps) unless
otherwise authorized in writing by the Department. Controls shall be
provided such that an alarm shall signal when one (1) of the pumps
malfunctions;
(j) All pumps serving commercial systems shall be operated through a
pre -manufactured electrical control panel. Means of monitoring pump
performance through the use of elapsed time meters and cycle counters
are required;
(k) Where multiple pumps are operated in series, an electrical control
panel shall be installed which will prevent the operation of a pump or
pumps preceding a station which experiences a high level alarm event.
(5) Dosing Siphons. Dosing siphons used in on-site sewage disposal systems
shall comply with all of the following minimum requirements:
(a) The siphon shall be constructed of corrosion -resistant materials;
(b) The siphon shall be installed in accordance with the manufacturer's
recommendations;
(c) The manufacturer's installation and maintenance instructions shall be
kept on site;
(d) The installation shall include an electrically operated device which
tracks the operation of the siphon by measuring cycle events and
records them by means of an event counter mounted within the
dwelling or structure served.
340-73-056 EFFLUENT FILTERS.
Effluent filters used in on-site sewage disposal systems shall meet the following criteria:
(1) Filters shall be of durable, resilient, corrosion resistant, non -degradable
materials resistant to deformation under normal operating conditions.
(2) Filters shall be designed to prevent the escape of sludge or scum during
normal operation and in the event of a malfunction, including filter clogging.
(3) The filter shall retain all particles greater than one-eighth (1/8) inch in size.
SSRULEB (04-01-95) 73-9 On -Site Disposal
0145-150'
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Prograrn
(4) The filter assembly shall baffle the sludge and scum layers to prevent the
escape of gross solids during sludge bulking or gas ebullition.
(5) Filters shall be designed and positioned to allow for easy, trouble-free
removal from and reinstallation to the screen apparatus from the assembly.
(6) The assembly shall be capable of withstanding stresses placed upon it by
installation, operation and service.
(7) The assembly shall perform as a conventional tank outlet, meeting the
requirements of OAR 340-73-025(6), when the filter is removed.
(8) The assembly shall be vented with nominal one-half inch diameter opening to
an elevation above the top of the tank.
(9) The filter must be designed to handle the flow of the system it is to serve
and not result in excessive maintenance. For a single family dwelling,
maintenance is considered "excessive" when the filter requires service or
cleaning more than one (1) time per year. Service shall be performed each time
the tank.is pumped, and in accordance with the manufacturer's specifications.
(10) To obtain Department approval, the manufacturer of an effluent filter shall
provide the Department with the necessary technical data to show that the
design and materials comply with these rules. Each manufacturer shall
provide an operation and maintenance manual with each unit distributed.
340-73-060 PIPE MATERIALS AND CONSTRUCTION.
(1) Effluent Sewer Pipe:
The effluent sewer shall be constructed with materials in conformance to
building sewer standards, as identified in the Oregon State Plumbing Laws
and Administrative Rules. The effluent sewer pipe shall have a minimum
diameter of three (3) inches. When the septic tank is fitted with an effluent
filter, the minimum nominal diameter of piping may be reduced to one and
one-quarter (1.25) inches.
(2) Distribution and Header Pipe and Fittings:
(a) Plastic Pipe and Fittings:
(A) Styrene -rubber plastic distribution and header pipe and fittings
shall meet the most current ASTM (American Society for
Testing and Materials) Specification D 2852 and Sections 5.5
and 7.8 of Commercial Standard 228, published by the U.S.
Department of Commerce. Pipe and fittings shall also pass a
SSRULEB (04-01-95) 73-10 On -Site Disposal
0145-15H8
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
deflection test withstanding three hundred -fifty (350)
pounds/foot without cracking by using the method found in
ASTM 2412. In addition to the markings required by ASTM
2852, each manufacturer of styrene -rubber plastic pipe shall
certify, in writing to the Department, that the pipe to be
distributed for use in absorption facilities within the State of
Oregon will comply with all requirements of this section;
(B) Polyethylene distribution pipe in ten (10) foot lengths and
header pipe in lengths of ten (10) feet or greater of which pipe
and fitting shall meet the current ASTM Specification F405.
Pipe and fittings shall also pass a deflection test withstanding
three hundred -fifty (350) pounds per foot without cracking or
collapsing by using the method found in ASTM 2412. Pipe
used in absorption facilities shall be heavy duty. In addition to
the markings required by ASTM F405, each manufacturer of
polyethylene pipe shall certify, in writing to the Department that
the pipe to be distributed for use in absorption facilities within
the State of Oregon will comply with all requirements of this
section;
(C) Polyvinyl chloride (PVC) distribution and header pipe and
fittings shall meet the most current ASTM Specification D-2729.
Pipe and fittings shall pass a deflection test withstanding three
hundred -fifty (350) pounds per foot without cracking or
collapsing by using the method found in ASTM 2412. Markings
shall meet requirements established in ASTM Specification
D-2729, subsections 9.1.1., 9.1.2 and 9.1.4. Each manu-
facturer of polyvinyl chloride pipe shall certify, in writing to the
Department, that pipe and fittings to be distributed for use in
absorption facilities within the State of Oregon will comply with
all requirements of this section;
(D) Polyethylene smooth wall distribution and header pipe (ten (10)
foot lengths) and fittings shall meet the most current ASTM
specification F 810. Pipe and fittings shall also pass a
deflection test of three hundred fifty (350) pounds per foot
without cracking or collapsing by using the method found in
ASTM 2412. Markings shall meet the requirements established
in ASTM specification F 810, Section 9. Each manufacturer of
polyethylene smooth wall pipe shall certify, in writing to the
Department that the pipe to be distributed for use in absorption
facilities within the State of Oregon will comply with all
requirements of this rule;
(E) The four types of plastic pipe described above shall have two
(2) rows of holes spaced one hundred -twenty (120) degrees
SSRULEB (04-01-95) 73-11 On -Site Disposal
0145-1569
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
apart and sixty (60) degrees on either side of a center line. For
distribution pipe, a line of contrasting color shall be provided on
the outside of the pipe along the line furthest away and parallel
to the two (2) rows of perforations. Markings, consisting of
durable ink, shall cover at least fifty (50) percent of the pipe.
Markings may consist of a solid line, letters, or a combination
of the two. Intervals between markings shall not exceed twelve
(12) inches. The holes of each row shall be not more than five
(5) inches on center and shall have a minimum diameter of
one-half (1/2) inch.
(b) Concrete tile in twelve (12) inch lengths shall meet the current ASTM
Specification C 412. Each manufacturer of concrete tile shall certify,
in writing to the Department, that the pipe to be distributed for use in
absorption facilities within the State of Oregon will comply with all of
the requirements of this section;
(c) Clay drain the in twelve (12) inch lengths shall meet the current
ASTM Specification C 4. Tile used as part of an absorption facility
shall bear the ASTM number above and some identification as to
which quality standard it meets (Standard, Extra -Quality, Heavy -
Duty). In addition to the markings required above, each manufacturer
of clay tile shall certify, in writing to the Department, that the pipe to
be distributed for use in absorption facilities within the State of
Oregon shall comply with all of the requirements of this section;
(d) Bituminized fiber solid pipe and fittings shall meet the current ASTM
Specification D 1861. Perforated bituminized fiber pipe shall meet the
current ASTM Specification D 2312. Each length of pipe and each
fitting shall be marked with the nominal size, the manufacturer's name
or trademark, or other symbol which clearly identifies the manu-
facturer and the appropriate ASTM specification number above.
Markings on pipe shall be spaced at intervals not greater than two (2)
feet. In addition to the markings required above, each manufacturer
of bituminized pipe shall certify, in writing to the Department, that the
pipe to be distributed for use in absorption facilities within the State of
Oregon shall comply with all requirements of this section. In addi-
tion, all bituminized pipe that is to be installed as part of an absorption
facility shall comply with the following requirements. The pipe shall
have two rows of holes spaced one hundred -twenty (120) degrees apart
and sixty (60) degrees on either side of a center line. For distribution
pipe, a line of contrasting color shall be provided on the outside of the
pipe along the line furthest away and parallel to the two (2) rows of
perforations. Markings, consisting of durable ink, • shall cover at least
fifty (50) percent of the pipe. Markings may consist of a solid line,
letters, or a combination of the two. Intervals between markings shall
not exceed twelve (12) inches. The holes of each row shall not be
SSRULEB (04-01-95) 73-12 On -Site Disposal
0145-" "O
DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
more than five (5) inches on center and shall have a minimum
diameter of one-half (1/2) inch;
(e) Polyvinyl chloride (PVC) pressure transport pipe, pressure manifolds,
and pressure lateral pipe and fittings shall meet the current re-
quirements for Class 160 PVC 1120 pressure pipe as identified in
ASTM Specification D-2241. The pipe and fittings shall marked be as
required by ASTM Specification D-2241.
NONWATER-CARRIED WASTE DISPOSAL FACILITIES, MATERIALS,
AND CONSTRUCTION.
340-73-065 PRIVIES AND PORTABLE TOILET SHELTERS.
(1) Privies and portable toilet shelters shall comply with the following general
requirements:
(a) Structures shall be free of hostile surface features, such as exposed
nail points, sharp edges, and rough or broken boards, and shall
provide privacy and protection from the elements;
(b) Building ventilation shall be equally divided between the bottom and
top halves of the room. All vents shall be screened with sixteen (16)
mesh screen of durable material;
(c) Buildings shall be of fly -tight construction and shall have self-closing
doors with an inside latch;
(d) Pits, tanks or vaults shall be vented to the outside atmosphere by a flue
or vent stack having a minimum inside diameter of four (4) inches.
Vents shall extend not less than twelve (12) inches above the roof,
(e) Interior floors, walls, ceilings, partitions, and doors shall be finished
with readily cleanable impervious materials resistant to wastes, clean-
sers and chemicals. Floors and risers shall be constructed of im-
pervious material and in a manner which will prevent entry of vermin;
(f) Seat tops shall be not less than twelve (12) inches nor more than
sixteen (16) inches above the floor. The seat openings shall be
covered with attached, open -front toilet seats with lids, both of which
can be raised to allow use as a urinal;
(g) The distance between the front of the riser and the building wall shall
not be less than twenty-one (21) inches;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(2) Privies. In addition to complying with the requirements specified in section
1 of this rule, privies shall be provided with:
(a) Adequate ventilation shall be provided to allow for the free escape of
gases and odors;
(b) A minimum clear space of twenty-four (24) inches between seats in
multiple -unit installations and a clear space of twelve (12) inches from
the seat opening to the building wall in both single and multiple units.
(3) Portable Toilet Shelters. Portable toilet shelters may be prefabricated, skid
mounted, or mobile. In addition to complying with the requirements
specified in Section 1 of this Rule, portable toilet shelters shall:
(a) Provide screened ventilation to the outside atmosphere having a
minimum area of one (1) square foot per seat;
(b) Provide a minimum floor space outside of the riser of nine (9) square
feet per seat;
(c) Be furnished with a toilet tissue holder for each seat;
(d) Be located in areas readily accessible to users and to pumping/cleaning
services;
(e) Provide separate compartments with doors and partitions or walls of
sufficient height to insure privacy in multiple -unit shelters except that
separate compartments are not required for urinals.
340-73-070 UNSEALED EARTH PITS FOR PRIVIES.
(1) The pit shall be constructed of such material and in such a manner as to
prevent rapid deterioration, provide adequate capacity, and facilitate
maintenance in a satisfactory manner under ordinary conditions of usage.
(2) The pit shall provide a capacity of fifty (50) cubic feet for each seat installed
in the privy building and shall be at least five (5) feet deep. The area within
sixteen (16) inches of the surface grade shall not be counted as part of the
fifty (50) cubic -foot capacity.
(3) Pit cribbing shall fit firmly and be in uniform contact with the earth walls on
all sides, and shall rise at least six (6) inches above the original ground line
and descend to the full depth of the pit. However, pit cribbing below the
soil line may be omitted in rock formations.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-73-075 SELF-CONTAINED NONWATER-CARRIED TOILET FACILITIES.
(1) General Standards. All self-contained nonwater-carried toilet facilities shall
comply with the following requirements:
(a) They shall have water -tight chambers constructed of reinforced con-
crete, plastic, fiberglass, metal, or of other material of acceptable
durability and corrosion resistance, approved by the Department, and
designed to facilitate the removal of the wastes.
(b) Black wastes shall be stored in an appropriate chamber until removal
for final disposal elsewhere. Wastes shall be removed from the
chamber whenever necessary to prevent overflow.
(c) Chemicals containing heavy metals, including but not limited to
copper, cadmium and zinc, shall not be used in self-contained toilet
facilities.
(d) All surfaces subject to soiling shall be impervious, easily cleanable,
and readily accessible.
(2) Vault Toilet Facilities:
(a) The minimum capacity of vaults shall be three hundred -fifty (350)
gallons or, in places of employment, one hundred (100) gallons per
seat.
(b) Caustic shall be added routinely to vault chambers to control odors.
(3) Chemical Toilet Facilities:
(a) Toilet bowls shall be constructed of stainless steel, plastic, fiberglass,
ceramic or of other material approved by the Department.
(b) Waste passages shall have smooth surfaces and be free of obstructions,
recesses or cross braces which would restrict or interfere with flow of
black wastes.
(c) Biocides and oxidants shall be added to waste detention chambers at
rates and intervals recommended by the chemical manufacturer and
approved by the Department.
(d) Chambers and receptacles shall provide a minimum storage capacity of
fifty (50) gallons per seat.
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DEPARTMENT OF ENVIRONMENTAL QUALITY
Water Quality Program
(e) Portable shelters housing chemical toilets shall display the business
name of the licensed sewage disposal service that is responsible for
servicing them.
340-73-080 CONSTRUCTION OF GRAY WATER WASTE DISPOSAL SUMPS.
A gray water waste disposal sump shall consist of a receiving chamber, settling chamber, and
either a seepage chamber or disposal trench.
340-73-085 FLEXIBLE MEMBRANE LINERS FOR SAND FILTERS TREATING SEPTIC
TANK EFFLUENT.
(1) Unsupported polyvinyl chloride (PVC) shall have the following properties:
Property
Test Method
(a) Thickness
ASTM D1593
30 mil,
Para 9.1.3
minimum
(b) Specific Gravity (Minimum)
ASTM D792
Method A
(c) Minimum Tensile Properties
ASTM D882
(each direction)
(A) Breaking Factor
Method A or B
69
(pounds/inch width)
(1 inch wide)
(B) Elongation at Break
Method A or B
300
(percent)
(C) Modulus (force) at 100%
Method A or B
27
Elongation (pounds/inch
width)
(d) Tear Resistance (pounds,
ASTM D1004
8
minimum)
Die C
(e) Low Temperature
ASTM D1790
-20°F
(f) Dimensional Stability (each di-
ASTM D1204
t5
rection, percent change maxi-
212°F, 15 min.
mum)
(g) Water Extraction
ASTM D1239
-0.35% max.
(h) Volatile Loss
ASTM D1203
0.7% max.
Method A
(i) Resistance to Soil Burial (per-
ASTM D3083
cent change maximum in origi-
nal value)
(A) Breaking Factor
-5
(B) Elongation at Break
-20
(C) Modulus at 100%
±10
Elongation
(j) Bonded Seam Strength (factory
ASTM D3083
55.2
seam, breaking factor, ppi width)
(k) Hydrostatic Resistance
ASTM D751
82
Method A
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(2) Installation Standards:
(a) Patches, repairs and seams shall have the same physical properties as
the parent material;
(b) Site considerations and preparation:
(A) The supporting surface slopes and foundation to accept the liner
shall be stable and structurally sound including appropriate
compaction. Particular attention shall be paid to the potential of
sink hole development and differential settlement;
(B) Soil stabilizers such as cementations or chemical binding agents
shall not adversely affect the membrane; cementations and
chemical binding agents may be potentially abrasive agents.
(c) Only fully buried membrane liner installation shall be considered to
avoid weathering;
(d) Unreinforced liners have high elongation and can conform to irregular
surfaces and follow settlements within limits. Unreasonable strain
reduces effective thickness and may reduce life expectancy by
lessening the chemical resistance of the thinner (stretched) material.
Every effort shall be made to minimize the strain (or elongation)
anywhere in the flexible membrane liner;
(e) Construction and installation:
(A) Surface condition:
(i) Preparation of earth subgrade. The prepared subgrade
shall be of soil types no larger than Unified Soil
Classification System (USCS) sand (SP) to a minimum
of four (4) inches below the surface and free from
loose earth, rock, fractured stone, debris, cobbles,
rubbish and roots. The surface of the completed
subgrade shall be properly compacted, smooth,
uniform and free from sudden changes in grade.
Importing suitable soil may be required;
(ii) Maintenance of subgrade. The earth subgrade shall be
maintained in a smooth, uniform and compacted condi-
tion during installation of the lining.
(B) Climatic conditions:
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(i) Temperature. The desirable temperature range for
membrane installation is 42°F to 78°F. Lower or
higher temperatures may have an adverse effect on
transportation, storage, field handling and placement,
seaming and backfilling and attaching boots and
patches may be difficult. Placing liner outside the
desirable temperature range shall be avoided;
(ii) Wind. Wind may have an adverse effect on liner in-
stallation such as interfering with liner placement.
Mechanical damage may result. Cleanliness of areas
for boot connection and patching may not be possible.
Alignment of seams and cleanliness may not be
possible. Placing the liner in high wind shall be
avoided;
(iii) Precipitation. When field seaming is adversely
affected by moisture, portable protective structures
and/or other methods shall be used to maintain a dry
sealing surface. Proper surface preparation for
bonding boots and patches may not be possible.
Seaming, patching and attaching 'boots' shall be done
under dry conditions.
(C) Structures. Where penetrations are necessary, liners shall be
attached to pipes with a mechanical type seal supplemented by a
chemically compatible caulking or adhesives to effect a
liquid -tight seal. The highest order of compaction shall be
provided in the area adjacent to pipes to compensate for any
settlement;
(D) Liner Placement:
(i) Size. The final cut size of the liner shall be carefully
determined and ordered to generously fit the container
geometry without field seaming or excess straining of
the liner material;
(ii) Transportation, handling and storage. Trans-portation,
handling and storage procedures shall be planned to
prevent material damage. Material shall be stored in a
secured area and protected from adverse weather;
(iii) Site inspection. A site inspection shall be carried out
by the Agent and the installer prior to liner installation
to verify surface conditions, etc;
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
(iv) Deployment. Panels shall be positioned to minimize
handling. Seaming should not be necessary. Bridging
or stressed conditions shall be avoided with proper
slack allowances for shrinkage. The liner shall be
secured to prevent movement and promptly backfilled;
(v) Anchoring trenches. The liner edges should be
secured frequently in a backfilled trench;
(vi) Field seaming. Field seaming, if absolutely necessary,
shall only be attempted when weather conditions are
favorable. The contact surfaces of the materials should
be clean of dirt, dust, moisture, or other foreign
materials. The contact surfaces shall be aligned with
sufficient overlap and bonded in accordance with the
suppliers recommended procedures. Wrinkles shall be
smoothed out and seams should be inspected by non-
destructive testing techniques to verify their integrity.
As seaming occurs during installation, the field seams
shall be inspected continuously and any faulty area
repaired immediately;
(vii) Field repairs. It is important that traffic on the lined
area be minimized. Any necessary repairs to the liner
shall be patched using the same lining material and
following the recommended procedure of the supplier;
(viii) Final inspection and acceptance. Completed liner in-
stallations shall be visually checked for punctures,
rips, tears and seam discontinuities before placement of
any backfill. At this time the installer shall also
manually check all factory and field seams with an
appropriate tool. In lieu of or in addition to manual
checking of seams by the installer, either of the
following tests may be performed:
(I) Wet Test: The lined basin shall be flooded to the
one (1) foot level with water after inlets and
outlets have been plugged. There shall not be any
loss of water in a 24 hour test period;
(II) Air Lance Test: Check all bonded seams using a
minimum 50 PSI (gauge) air supply directed
through a 3/16 inch (typical) nozzle, held not more
than 2 inches from the seam edge and directed at
the seam edge. Riffles indicate unbonded areas
within the seam, or other undesirable seam construction.
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DEPARTMENT OF ENVIRONMENTAL QUALITY Water Quality Program
340-73-090 IMPLEMENTATION DATE.
These rules become effective April 1, 1995. Until these rules become effective, existing rules
remain in effect. Nothing in this Section is intended to prevent the Department from taking any
action necessary to prepare for implementing the new rules.
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