Section 437.13 - Effluent limitations attainable by the application of the best available technology economically achievable (BAT)(a) Except as provided in 40 CFR 125.30 through 125.32 or § 437.10(b) , any existing point source subject to this subpart must achieve the following effluent limitations representing the application of BAT: Limitations for antimony, arsenic, cadmium, chromium, cobalt, copper, lead, mercury, nickel, silver, tin, titanium, vanadium, and zinc are the same as the corresponding limitation specified in § 437.11(a) .(b) In-plant standards for cyanide are the same as the limitations specified in § 437.11(b) . 65 FR 81300 , Dec. 22, 2000, as amended at 68 FR 71023 , Dec. 22, 2003