Wasteload allocations for the implementation of numerical criteria for toxic

substances to protect the Fish and Wildlife Propagation beneficial use [REVOKED] If a pollutant exhibits reasonable potential, a water quality-based permit limit is required for that pollutant. Background levels used in calculating WLAA and WLAC are described in OAC 252:690-3-11 through 14. If a pollutant's background level alone exceeds a criterion, the WLA is set equal to that criterion. (1) Streams. The following applies to streams: (A) WLAA. Where Qe is expressed in cfs, Equation F-1 is used to determine WLAA. Where Qe is expressed in mgd, Equation F-2 is used. (B) WLAC. Depending on the value of Q*, Equation F-3, F-4 or F-5 is used to determine WLAC. (2) Lakes. Depending on whether the discharge conveyance is a pipe or canal, Equation F-6 or F-7 is used to determine WLAC, or WLAA, if an acute criterion applies, in the absence of a chronic criterion. 28