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COLORADO DEPARTMENT OF HEALTH, Water Qunliry Conrro! Division <br />Rationale - Pnge 10, Pernrit No. CO-0032638 <br />As part ojthis determitration, the Division shall evaluate whether the pernrittee could have controlled the <br />disci+nrge in such a manner tha[ primary limitations could hove been met. All manual dewarering of the ponds <br />shall meet TSS and total iron limitations. <br />cJ Pollumrus Limited by WNer OunliN Standards: Since Ourfalls 001 and 005 only contain surface runoff; no <br />pollutants are limited by water quality starufnrds, with the erceptiort of pH. <br />Ourfn!!s 002, 003, 004 and 006 contain mine drainage oral/or spoils spring water (outjall consists exclusively of <br />spoils spring water). This may result in discharge nt any time. Therefore, water quality-based effluent <br />lirrritatioru must 6e considered. The calculated water quality-based effluent limitations are presented in Table <br />VI-5. For those parameters shown in Tables V/-2 and VI-3 that are limited 6y Water Quality Standards, the <br />rtrnss balance equation shown in 17.A.2. was used to calculate the allowable ejjluent limitations that would not <br />cause the water quality standards to be violated for the discharges. These fintitations are shown as the values <br />for M1 in Table Vl-S. The values for Qt, Qt and QJ for chronic acrd acute limitations, taken from section <br />111.8.2. of this rationale, and used in the calculntiorrs for water quality limited parameters are.• <br />Florv Acule and Chronic <br />Aug = Feb Afnr -July <br />Q, 6.0 cfs 6.0 cfs <br />Qt 1.3 cfs* 8.7 cfs** <br />Q3 Z 3 cfs 14.7 cfs <br />• This value is fie Coto( of the nmrinuun combined reposed flow fir ourfafls (X73 and (b6 (Q91 acrd (X14 bare not repw'rrd ffow druing <br />this period). <br />'• This vafue is the rota! of the marimrnn combined reported Jlow fu afl four ou fnlLs during this period. <br />7Fre value for Mt has been set nt Zero (see section IL B. 1.) and the values for Ms vary depending mr the <br />applicable x•nrer quality standards MtJ. These values for Mt m~e shown in Table VI-5 along with d+e cnfculnred <br />effluent limitations (M1J far ourlnlls 002, 003, 004 and 006. <br />TnGle VI-5 -- Summary o(Mass Balance Calculations <br />Pnrmneler Stremn Standard, (Af3), <br />Acute/Chronic E1lluent Concentration, (M2), Acute/Chronic <br />Aug -Feb Afar -July <br />Arsenic (IRJ, ug/P 50/NA 280/NA 84.5/NA <br />Cndnrium (PDJ, ug/f 4.82/1.3/ 27/7 8/2 <br />Copper (PDJ, ug/P 21.06/13.82 118/78 35.6/23.4 <br />b~ulr (TRJ, ug/P NA/l000 N,A/5615 NA/1690 <br />lrnn (PDJ, ug/P NA!300 NA/1684 NA/507 <br />Lend (PDJ, ug/P 128.67/5.04 723123 217/8.5 <br />Mnugmrese (TRJ, ug/P NA/1000 NA(5615 NA/1690 <br />,1lnngnnese (PDJ, us/P NA/50 NA/281 NA/84.5 <br />Afercnrv (TR), us/P NA/0.01 NA/0.06 NA/0.02 <br />A~i ckel (PDJ, erg/P 1062.6/109.78 5967/6/6 1795/185 <br />Sifter (PDI, us/P 2.79/0.10 15.6/0.6 4.7/0.2 <br />Zinc (PDJ, trg/P /36.57/123.7 767/695 231/209 <br />,Sulfate, mg/P 250 NA(1404 NA/422 <br />(PDJ: Paeuunlly Dissolved Fracnnn <br />rTR): Tnrul Rrcurcroblr FrorTan <br />