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RAG Empire Corporation, Eagle Mine Water Quality Assessment CO-0034142 <br />This segment is composed of the "Mainstem of the Williams Fork River from the highway 13/789 <br />bridge at Hamilton to the confluence with the Yampa River. Mainstem Morapos Creek from source <br />to confluence with the Williams Fork River." Stream segment COLCLY 13b is classified for Warm <br />Water Aquatic Life Class 2, Class ] a Existing Primary Contact Recreation, Agriculture, and Water <br />Supply. <br />Numeric standards aze developed on abasin-specific basis and are adopted for pazticulaz stream <br />segments by the Water Quality Control Commission. To simplify the listing of the segment-specific <br />standards, many ofthe aquatic life standards aze contained in a table at thebeginning of each chapter <br />of the regulations. The standazds in Table A-2 have been assigned to stream segment.COLCLY13b <br />in accordance with the Classification and Numeric Standards for Lower Colorado River Basin. <br />Table A-2 <br />In-stream Standards for Stream Se meat COLCLY13b <br />`~~•~~-. ~~'..~k'>. °Prh.J_ncp`~z1+.nazBio`lo'aca'r?. .~~~.'~"'~~?-, <br />Dissolved Ox en tD0 = 5 m m;ni,m,.n <br />H=6.5-9su <br />Fecal Coliform = 2000 colonies/100 ml <br />Un-ionized ammonia acute = TVS <br />Un=ionized ammonia chronic = 0.] m <br />Chlorine acute = 0.019 <br />Chlorine chronic = 0.011 <br />Free Cyanide acute = 0.005 <br />Sulfide chronic = 0.002 m <br />Sulfate chronic = 250 tri <br />Boi6n chronic =""' 0.75 <br />-Nitrite = 0.05 <br />"Nitrate = 10 m <br />Chloride chronic = 250 m <br />Total Recoverable Arsenic acute = 50 u <br />Dissolved Cadmium acute and chronic =TVS <br />Total Recoverable Trivalent Chromium acute = 50 <br />Dissolved Hexavalent Chromium acute and chronic = TVS <br />Dissolved Co er acute and chronic = TVS <br />Dissolved Iron chronic = 300 u <br />Total Recoverable Iron chronic = 1000 u <br />Dissolved-Lead acute and chronic = TVS <br />Pissolved Man a>rese chronic = 50 u <br />Total Recoverable Meicury chronic = 0.01 u <br />Dissolved Nickel acute and chronic = TVS <br />Total Recoverab]e~elenium chronic = 10 <br />Dissolved Silver acute and chronic = TVS <br />Dissolved Zinc acute and chronic = TVS <br />Appendix A Page 3 of 13 <br />•~ <br />••. <br />~~ <br />