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RAG Empire Corporation, Eagle Mine Water Quality Assessment CO-0034142 <br /> <br />Table A-4 <br />Site-Specific Water Quality Standards For !be Eagle Mine CO -0034142 <br />Based on Future TVS Equations <br />Based on the Table Value Standazds Contained in the Colorado Department of Public Health <br />and Environment Water Quali Control Commission Re lotion 37 <br />Calculated Using the Following Value for Hardness as CaCO3: X24 in"g/I <br />n,~=~ t ~°n,~iz-e m'~ ,curie s "- .w <br />'" <br />aramele ~ ~l <br />5,~~~r - -~ °' <br />, ~~Q..pa7r. s:.`ll+n a_rii '> ~ " ~- a{~~ 'Farmiiia~,.;._ " <br /> <br />d .Acute lO Ugll . [].]3667-0.041841n(hardnoss)][e(1.128(In(liirdnt;s)}3.6867)]'- <br />Cadtitium, Dissolve 78sz <br />h <br />li <br />o <br />a <br />z <br />7 <br /> <br />Ch701r1C <br />4.1 Ug/1 ( <br />,( <br />ar <br />( <br />. <br />. <br />ncas)} <br />7s)] <br />[1.70167-0.041841n(tiardness)][e <br />Hexavalent Chromium, Acute 16 Ug/1 Numeric standardsprovidcd, formula not applicable <br />Dissolved Chronic 11 Ugll Numeric standards provided, formula not applicable <br /> Acute 29 ugn e(os4zz(m(naraneaa)}ta4oa) <br />d <br />Copper, Dissolve ChrOnrC ]$ Ugil e(0.8545(In(hardness)}1.7428) <br /> <br />d Acute 1$4 Ug/1 [1.46203-0.145712fi(hardncss)1[e(t•273(In(hardness)}1.46)1 <br />Lead, Dissolve ta7 <br />n <br /> <br />CIIrOniC <br />6.O Ugh] ( <br />s(m( <br />aranesa)}a.:7os)l <br />[I;a6203-0.1457121n(hardncss)](e <br /> ACUte 926 ug/1 e(0.846(In(hardncss)}t2.253) <br />d <br />Nickel, Dissolve Chronic 103 u <br />i~ e (o.saepn(naran~s>)+o.ossa) <br /> Acute 8.1 Ugll ~? C (1.72(in(hardness)}6.52) <br />d <br />i <br />i <br />lver, D <br />ssolve <br />S Chronic 1.3 ug/1 e(1.72(ln(hardness)}9.06) <br />~~ Acute 232 u ero.8473(tn(hardncaa)}W.867a> <br />i <br />l <br />d <br />sso <br />ve <br />Zinc, D Chr071iC 234 U ~ B (0.8473(In(hardriess))+0.8699) <br />To address the lack of specific data points, an estimate of the 1501, 500' and 850' percentile values was . <br />made, assuming a normal distribution and the following relationship as described in EPAs Technical. <br />Support Document for Water Quality Based Toxics Control: <br />~. = Bso-a3o s. <br />where: <br /> <br />C = Estimated concentration represented by the 1501, 500' or 850' percentile distribution <br />-~ z = Normal distribution values for the 1501, 500' or 850' percentile of-1.0364, 0 or•1.0364, <br />respectively <br />v2 = Variance, or the standard deviation divided by the mean. ` _- <br />Based on these manipulations of the aggregate data, a determination of the upstream ambient water <br />quality of the Williams Fork River was made and is presented in Tables A-5. <br />Appendix A Page 6 of 13 <br />