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Cotter Corporation Water Quality Assessment CO-0036251 <br />Table A-4 <br />~, Site-Speci£c Metals Water Quality Standards For CO-0036251 <br />Based on the Table Value Standazds Contained in the Colorado Department ofPublic Health <br />and Environment Water Quality Control Commission Re lation 35 <br />Calculated Using the Following Value for Hazdness as CaCO3: 223 me/1 <br /> <br />Di <br />l <br />d <br />i <br />d <br />C Acute 24 ug/I etl.IL8tminamneSSff-L9VJf <br />sso <br />ve <br />a <br />m <br />um, Chronic 2.1 ug/1 e (o.7aszpn(narane55>}3.a9o> <br />Trivalent Chromium, Acute 3349 ug/1 e(0.819(ln(hardness)}t3.688) <br />Dissolved ChrOri1C NA ng/1 No applicable standards <br />Hexavalent Chromium, Acute 16 Ug/1 Numeric standards provided, formula not applicable <br />D15SO1Ved ChTOn1C 1 ] Ug/1 Numeric standards provided, formula not applicable <br /> <br />Di <br />d <br />l Acute 38 llg/1 e (0.9422(In(hardness)}1.4634) <br />sso <br />ve <br />Copper, Chronic 23 u~/1 2 (0.8545Qn(hardness)}L465) <br />l <br />d <br />Di <br />d ~ --~-- - - _ ~ ~" <br />sso <br />ve <br />Lea <br />, ChronlC 12 U 1 2 (1.417Qn(hardness)}5.167) <br /> <br />k <br />l <br />Di <br />d <br />Ni <br />l Acnte 1702 llg/1 2 (0.76(In(hazdness)}F3.33) <br />c <br />, <br />sso <br />ve <br />e Chronic 176 ug/1 C (0.76(ln(hardness)}+1.06) <br /> <br />i ACUte 20 llgJl Numeric standards provided, formula not a <br />Selenium, D <br />ssolved <br />ChTOIDC <br />5.~ u 1 <br />Numeric standards provided, formula not a <br /> <br />l <br />d <br />il <br />Di Acute 8.1 u 1 e (1.72(In(hardness)}721) <br />ver, <br />sso <br />ve <br />S Chronic 1.3 ug/1 e (1.7z(ln(hardness)}9.o6) <br /> Acute 231 ug/1 e(o.Ra73(ln(hardness))+0.8604) <br />Zinc, Dissolved <br />Chromc <br />209 Ue/1 <br />B (0.8473(ln(hardness)}W.7614) <br />The ambient water quality was not assessed for the unnamed tributaries to East Paradox Creek and <br />Bull Canyon, and East Paradox Creek and Bull Canyon themselves because the background in- <br />stream low flow condition is zero, and because no ambient water quality data are available for these <br />receiving waters upstream of the Cotter Corporation outfalls. However, because downstream <br />standards applicable to the Dolores are evaluated as part of this WQA, the Dolores River ambient <br />water quality was evaluated. <br />Appendix A Page 6 of 13 Final <br />