Current through Register Vol. 60, No. 12, December 1, 2021
(1) pH (hydrogen ion concentration). pH
values may not fall outside the range of 7.0 to 9.0. When greater than 25
percent of ambient measurements taken between June and September are greater
than pH 8.7, and as resources are available according to priorities set by the
Department, the Department will determine whether the values higher than 8.7
are anthropogenic or natural in origin.
(2) Temperature. State waters in the Malheur
Lake Basin supporting the Borax Lake chub may not be cooled more than 0.3
degrees Celsius (0.5 degrees Fahrenheit) below the natural condition.
(3) 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
(4) Minimum Design Criteria
for Treatment and Control of Sewage wastes: 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
Or. Admin. R.
DEQ 17-2003, f. & cert.
ef. 12-9-03; DEQ 1-2007, f. & cert. ef.
Stat. Auth.: ORS 468.020, 468B.030, 468B.035 &
Stats. Implemented: ORS 468B.030, 468B.035 &