Or. Admin. R. 340-041-0290 - Water Quality Standards and Policies for this Basin

Current through Register Vol. 60, No. 12, December 1, 2021

(1) pH (hydrogen ion concentration). pH values may not fall outside the following ranges:

(a) All Basin waters (except main stem Columbia River and Cascade lakes): pH values may not fall outside the range of 6.5 to 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 340-041-0286: All Basin Waters (other than the main stem Columbia river) -- 100.0 mg/l.

(3)

(a) Minimum Design Criteria for Treatment and Control of Sewage Wastes:

(b) All Basin waters (except main stem Columbia River):

(A) During periods of low stream flows (approximately June 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 May 31): A minimum of secondary treatment or equivalent control 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.

Notes

Or. Admin. R. 340-041-0290

DEQ 17-2003, f. & cert. ef. 12-9-03

Stat. Auth.: ORS 468.020, 468B.030, 468B.035 & 468B.048

Stats. Implemented: ORS 468B.030, 468B.035 & 468B.048