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Deschutes County Board of Commissioners
1300 NW Wall St., Suite 200, Bend, OR 97701-1960
(541) 388-6570 - Fax (541) 385-3202 - www.deschutes.org
AGENDA REQUEST & STAFF REPORT
For Board Business Meeting of July 23, 2008
Please see directions for completing this document on the next page.
DATE: July 9, 2008
FROM: Barbara Rich CDD x4713
TITLE OF AGENDA ITEM:
Consideration of Board Signature of Resolution 2008-021, Adopting the Nitrate Loading Management
Model to Establish Performance Standards for Onsite Wastewater Treatment Systems in South
Deschutes County.
PUBLIC HEARING ON THIS DATE? No.
BACKGROUND AND POLICY IMPLICATIONS:
This resolution establishes the performance standards for onsite systems located in areas subject to
Deschutes County Code Chapter 13.14, South County Onsite Wastewater Treatment
FISCAL IMPLICATIONS:
There are no fiscal implications to this resolution for Deschutes County apart from incidental GIS work
required to create electronic access to the performance standards.
RECOMMENDATION & ACTION REQUESTED:
Signature of Resolution 2008-021.
ATTENDANCE: Barbara Rich, CDD
DISTRIBUTION OF DOCUMENTS:
Barbara Rich, CDD
REVIEWED
LEGAL COUNSEL
For Recording Stamp Only
BEFORE THE BOARD OF COUNTY COMMISSIONERS OF DESCHUTES COUNTY, OREGON
A Resolution Adopting the Nitrate Loading
Management Model to Establish Performance
Standards for Onsite Wastewater Treatment
Systems in South Deschutes County.
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RESOLUTION NO. 2008-021
WHEREAS, on July 21, 2008, the Board of County Commissioners ("Board") adopted Ordinance 20(8-
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 DESCHL TES
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 1 OF 2 — RESOLUTION NO. 2008-02 ] (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 County.
DATED this day of , 2008.
ATTEST:
BOARD OF COUNTY COMMISSIONERS
OF DESCHUTES COUNTY, OREGON
DENNIS R. LUKE, Chair
TAMMY (BANEY) MELTON, Vice Chair
Recording Secretary MICHAEL M. DALY, Commissioner
PAGE 2 OF 2 — RESOLUTION NO. 2008-021 (07/21/08)