2008-764-Resolution No. 2008-021 Recorded 7/28/2008PUNTY OFFICIAL
REVIEWED NANCYUBLANKENSHIP, COUNTY CLERKDS C 2448-764
COMMISSIONERS' JOURNAL
LEGAL COI SEL 47/28/2008 11:23:04 RM
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2008-764
BEFORE THE BOARD OF COUNTY COMMISSIONERS OF DESCHUTES COUNTY, OREGON
A Resolution Adopting the Nitrate Loading
Management Model to Establish Performance * RESOLUTION NO. 2008-021
Standards for Onsite Wastewater Treatment
Systems in South Deschutes County.
WHEREAS, on July 21, 2008, the Board of County Commissioners ("Board") adopted Ordinance 2008-
012 to add Deschutes County Code ("DCC") Chapter 13.14 to protect public waters in south Deschutes County
from pollution by onsite wastewater treatment systems, and
WHEREAS, DCC 13.14.050(E) provides that the Board must adopt by resolution the minimum nitrogen
reduction standards and the map depicting the locations where these standards apply; and
WHEREAS, beginning in 1999, the United States Geological Survey ("USGS") and the Oregon
Department of Environmental Quality ("DEQ") conducted significant groundwater investigations in the Upper
Deschutes River watershed, in general, and the La Pine sub -basin in particular, and
WHEREAS, the USGS and the DEQ developed the three-dimensional groundwater and nutrient fate
and transport model of the La Pine sub -basin of the Upper Deschutes River watershed, and
WHEREAS, on or about 2007, the USGS and the DEQ published documentation of the development
and findings of the groundwater study, the three-dimensional groundwater and nutrient transport model and the
Nitrate Loading Management Model, and
WHEREAS, the USGS developed the Nitrate Loading Management Model ("Model") as a groundwater
quality management tool for use in south Deschutes County;
WHEREAS, the Model can be used to identify performance standards for onsite systems that will
maintain no higher than 7 mg/L nitrate as N average concentrations in the shallow groundwater in accordance
with OAR 340-040, Groundwater Quality Protection, now, therefore,
BE IT RESOLVED BY THE BOARD OF COUNTY COMMISSIONERS OF DESCHUTES
COUNTY, OREGON, as follows:
Section 1. The Board adopts the Nitrate Loading Management Model published by the USGS in
December 2007 as the basis for approving the nitrogen reducing onsite wastewater treatment systems pursuant
to DCC Chapter 13.14.
Section 2. The minimum nitrogen reduction require pursuant to DCC Chapter 13.14.050(D) shall be
35% reduction of total nitrogen, which is approximately equal to a maximum of 30 mg/1 total nitrogen in
wastewater treatment system effluent from a typical residence at average flows of 225 gallons per day.
PAGE I OF 2 — RESOLUTION NO. 2008-021 (07/21/08)
Section 3. The maximum nitrogen reduction required pursuant to DCC Chapter 13.14.050(D) shall be
the nitrogen reduction achieved by a system approved by the DEQ and listed by Deschutes County as a
Maximum Nitrogen Reducing System pursuant to DCC 13.14.060.
Section 4. The locations, as produced by the Nitrate Loading Management Model, where the
performance standards for existing onsite systems must be achieved in the south Deschutes County region are
identified on the map attached as Exhibit "A," attached hereto and by this reference incorporated herein.
Section 5. The Deschutes County Community Development Department shall maintain the map
identifying the locations where the above performance standards must be achieved for existing systems in south
Deschutes Countyy..�
DATED this o ' day of 2008.
BOARD OF COUNTY COMMISSIONERS
OF DESCHUTES COUNTY, OREGON
DE IS R. LUKE, dair
TA ( EY) E TON, Vice Chair
ATTEST:
054�Recording Secretary
PAGE 2 of 2 — RESOLUTION NO. 2008-021 (07/21/08)