OAR 340-041-0135: Basin-Specific Criteria (Deschutes): Water Quality Standards and Policies for this Basin

(1) pH (hydrogen ion concentration). pH values may not fall outside the following ranges: (a) All other Basin streams (except Cascade lakes): 6.5–8.5; (b) Cascade lakes above 3,000 feet altitude: pH values may not fall outside the range of 6.0 to 8.5. (2) Total Dissolved Solids. Guide concentrations listed below may not be exceeded unless otherwise specifically authorized by DEQ upon such conditions as it may deem necessary to carry out the general intent of this plan and to protect the beneficial uses set forth in OAR 340-041-0562: 500.0 mg/l. (3) La Pine Aquifer. (a) In order to protect the shallow aquifer located in the vicinity of the community of La Pine in Deschutes County for present and future use as a drinking water source, it is the policy of the Environmental Quality Commission to support the implementation of the La Pine Aquifer Management Plan adopted by the Deschutes County Board of Commissioners on September 28, 1982, by requiring the following: (b) The waste water generated outside the core area of the community of La Pine but within the study area described in the La Pine Aquifer Management Plan, will be subjected to regulation under the Department’s on-site waste disposal rules (OAR 340-071); (A) The core area of the community of La Pine is that area defined as follows: Located in a portion of Sections 10, 11, 14, and 15, Township 22 South, Range 10 East, Willamette Meridian, Deschutes County, Oregon, more particularly described as follows: Beginning at the northwest corner of the intersection of U.S. Highway 97 and First Street (aka Reed Road); thence in a northeasterly direction along the westerly right-of-way line of said U.S. Highway 97 a distance of 1,480 feet, more or less, to the intersection of said U.S. Highway 97 and the northerly line of the south one-half of the southwest one-quarter of said Section 11; thence in a westerly direction along the northerly line of the south one-half of the southwest one-quarter of said Section 11 a distance of 1,950 feet, more or less, to the south one-sixteenth corner between said Sections 10 and 11; thence in a northerly direction along the section line between Sections 10 and 11, 990 feet, more or less, to the northeast corner of the south one-half of the north one-half of the northeast one-quarter of the southeast one-quarter of said Section 10 being the northeast corner of the Bend-La Pine School District property; thence in a westerly direction along the north line of the said south one-half of the north one-half of the northeast one-quarter of the southeast one-quarter, being the north line of the said Bend-La Pine School District property, 1,320 feet, more or less, to the northwest corner of the south one-half of the north one-half of the southeast one-quarter of the southeast one-quarter of said Section 10, said point further being the northwest corner of the Bend-La Pine School District property; thence in a southerly direction along the westerly line of the east one-half of the southeast one-quarter of said Section 10, 2, 310 feet, more or less, to a point at the intersection of the westerly line of the southeast one-quarter of the southeast one-quarter of said Section 10 and the northerly right-of-way line of said First Street, said point further being the southwest corner of the Bend-La Pine School District property; thence in an easterly direction along the northerly right-of-way line of said First Street, 350 feet, more or less, to a point on the northerly right-of-way line of said First Street due north of the northwest corner of the alley in Block 16 of the Plat of La Pine Subdivision; thence in a southerly direction along the westerly side of said alley 550 feet, more or less, to a point along the southerly right-of-way of 2nd Street due south of the southwest corner of the alley in Block 16 of the Plat of La Pine Subdivision; thence in an easterly direction along the southerly right-of-way of 2nd Street, 390 feet, more or less, to the southwest corner of the intersection of Stillwell Street and 2nd Street; thence in a southerly direction along the westerly right-of-way line of said Stillwell Street, 950 feet, more or less, to the northwest corner of the intersection of said Stillwell Street and 4th Street; thence in a southerly direction along the west right-of-way line of Stillwell Street approximately 1,186 feet to the northwest corner of the intersection of Stillwell Street and Hill Street; thence in a southwesterly direction along the west right-of-way line of Hill Street approximately 340 feet to the intersection of the west line of Hill Street with the north line of 8th Street; thence westerly along the north line of 8th Street, 41 feet, more or less to the northeast corner of the intersection of 8th Street and Stearns Street; thence in a southerly direction along the east right-of-way line of Stearns Street approximately 387 feet to the northeast corner of the intersection of Stearns Street and 9th Street; thence in an easterly direction along the north right-of-way line of 9th Street and the easterly extension of the north line of said 9th Street, 1,093 feet to its intersection with the east right-of-way line of Pengra Huntington Road; thence in a northerly direction along the east right-of-way line of Pengra Huntington Road approximately 1,166 feet to the southwest corner of Lot 31, Government Homesite Tracts; thence in an easterly direction along the south boundary of said Lot 31 approximately 263 feet to the southeast corner of said Lot 31; thence in a northerly direction along the east boundary of said Lot 31 approximately 200 feet to the south right-of-way line of Finley Butte Road; thence in an easterly direction along the south right-of-way line of Finley Butte Road approximately 675 feet to the southeast corner of the intersection of Finley Butte Road and Bonnie Road; thence in a northerly direction along the east right-of-way line of Bonnie Road approximately 1,075 feet to the southeast corner of the intersection of Bonnie Road and William Foss Road; thence in an easterly direction along the southerly right-of-way line of said William Foss Road, 1,640 feet, more or less, to the north-south center section line of said Section 14 thence in a northerly direction along the north-south center line of said Section 14, 1,635 feet, more or less, to the north right-of-way line of said First Street (aka Reed Road); thence in a westerly direction along the north right-of-way line of said First Street, 1,432 feet, more or less, to the point of beginning; (B) All dwellings and buildings that contain plumbing fixtures inside this core area boundary must eliminate the discharge of inadequately treated sewage, abandon existing on-site sewage disposal systems and connect to the regional sewerage facility. This must be done within 90 days following notification by the approved regional sewerage agency that sewer service is available. (c) Waste disposal systems for new developments within the La Pine Aquifer Management Plan Boundary where development density exceeds two single family equivalent dwelling units per acre or which have an aggregate waste flow in excess of 5,000 gallons per day may only be approved if a study is conducted by the applicant which convinces the department that the aquifer will not be unreasonably degraded. (4) In addition to the requirements set forth in section (3) of this rule, the following actions are encouraged: (a) Since the aquifer is presently degraded to the point where it does not meet Federal Drinking Water Standards, and the installation of sewer facilities will not immediately restore the quality to safe levels, Deschutes County should notify the citizens of the La Pine core area of the need to develop a safe drinking water supply for the community as soon as possible; (b) Residents of the La Pine area are encouraged to test their drinking water frequently; (c) Owners of underground liquid storage tanks are encouraged to periodically test the storage tanks to assure prompt detection and repair of leaks; (d) Data on the quality of the shallow aquifer in and around La Pine should be obtained on a periodic basis to assess the effect of the above waste water management decisions on the quality of the groundwater. (5) Minimum Design Criteria for Treatment and Control of Sewage Wastes: (a) Metolius River Subbasin and Deschutes River Basin above Bend Diversion Dam (river mile 165): Treatment resulting in monthly average effluent concentrations not to exceed 5 mg/l of BOD and 5 mg/l of SS or equivalent control; (b) Deschutes River from the Bend Diversion Dam (river mile 165) downstream to the Pelton Reregulating Dam (river mile 100) and for the Crooked River Subbasin: (A) During periods of low stream flows (approximately April 1 to October 31): Treatment resulting in monthly average effluent concentrations not to exceed 10 mg/l of BOD and 10 mg/l of SS or equivalent control; (B) During the period of high stream flows (approximately November 1 to March 31): A minimum of secondary treatment or equivalent and unless otherwise specifically authorized by the Department, operation of all waste treatment and control facilities at maximum practicable efficiency and effectiveness so as to minimize waste discharges to public waters. (c) Deschutes from the Pelton Reregulating Dam (river mile 100) downstream to the mouth: (A) During periods of low stream flows (approximately April 1 to October 31): Treatment resulting in monthly average effluent concentrations not to exceed 20 mg/l of BOD and 20 mg/l of SS or equivalent control; (B) During the period of high stream flows (approximately November 1 to March 31): A minimum of secondary treatment or equivalent and unless otherwise specifically authorized by the Department, operation of all waste treatment and control facilities at maximum practicable efficiency and effectiveness so as to minimize waste discharges to public waters.