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<br /> <br />COLORADO DEPART?IE,iT Or' HEALTH, '.:a[er Gua-:['~ Con[ro'_ 7ivision <br />Rationale - Page 3. Permit Yo. CO-0035021 <br />APPE:iDl't .~ <br />Water quality standard (WOS) based effluent lim_tations are calculated using <br />the following mass balance formula: <br />EL = WQS CQy_10 + QEFF) - (Q7-10 't C9.vB) <br />QEFF <br />Where: <br />EL = Calculated effluent limitation (mg/1) <br />WQS = Applicable water quality standard (mg/1) <br />Q7-10 = Beceiviao water 7-d3j, lO-7e3r lOW f10W (140 cis) <br />QEFF = Maximum effluent flow (0.123 cfs) <br />Cp~g =Ambient instream concentration Cmg/1)* <br />Following are some specific calculations: <br />Total Recoverable Iron: <br />EL = 2.3 (140 + 0.123) = 2,620 mg/1 <br />0.123 <br />Total Recoverable Manganese: <br />~L = 1.0 (140 + 0.123) = 1,139 mg!1 <br />0.123 <br />Total Recoverable Silver: <br />Fy = 0.0001 (140 + 0.123) = 0,114 mg/1 <br />0.123 <br />* For these calculations, ambient data is disregarded. <br />