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6 <br />Seneca Coal <br />Water Quality Assessment <br />CO-0000221 <br />Table A-6 <br />TVS-Based Metals Water Quality Standards For All Outfalls <br />Based on the Table Value Standards Contained in the Colorado Department of Public Health <br />and Environment Water Quality Control Commission Regulation 33 <br />Calculated Using the Following Value for Hardness as CaC03: 400 mg/l <br /> <br />Parameter In-Stream If"ater <br /> <br />Quali(v Standard <br />Formula Used <br />Di <br />l <br />C <br />d <br />i <br />d Acute 17 ug/1 [1.13667-0.041841n(hardness)][e(1.128(in(hardness))-3.828)] <br />a <br />m <br />um, <br />sso <br />ve Chronic 6.2 ug/1 [1.10167-0.041841n(hardness)][e(0.7852(ln(hardness))-2.715)] <br />Trivalent Chromium, Acute 1773 ug/1 a (0.819(ln(hardness))+2.5736) <br />Dissolved Chronic 231 ug/1 a (0.819(ln(hardness))+0.5340) <br /> <br />i <br />l <br />d Acute 50 ug/1 a (0.9422(ln(hardness))-1.7408) <br />Copper, D <br />sso <br />ve Chronic 29 ug/1 a (0.8545(ln(hardness))-1.7428) <br />Di <br />l <br />d <br />d Acute 281 ug/1 [1.46203-0.1457121n(hardness)][e(1.273(ln(hardness))-1.46)] <br />Lea <br />sso <br />ve <br />, Chronic 11 ug/1 [1.46203-0.1457121n(hardness)][e(1.273(ln(hardness))4.705)] <br /> <br />Di <br />l <br />d Acute 4738 ug/1 e (0.333 1 (ln(hardness))+6.4676) <br />ve <br />Manganese, <br />sso Chronic 2618 ug/1 a (0.3331(ln(hardness))+5.8743) <br />Ni <br />k <br />l <br />Di <br />l <br />d Acute 1513 ug/1 e (0.846(ln(hardness))+2.253) <br />c <br />e <br />, <br />sso <br />ve Chronic 168 ug/1 a (0.846(ln(hardness))+0.0554) <br />S <br />l <br />i <br />Di <br />l <br />d Acute 18 ug/1 Numeric standards provided, formula not applicable <br />e <br />en <br />um, <br />sso <br />ve Chronic 4.6 ug/1 Numeric standards provided, formula not applicable <br /> <br />Sil <br />Di <br />l <br />d Acute 22 ug/1 the (1.72(ln(hardness))-6.52) <br />ver, <br />ve <br />sso Chronic 3.5 ug/l e (1.72(ln(hardness))-9.06) <br /> <br />Zi <br />Di <br />l <br />d Acute 379 ug/1 a (0.8473(ln(hardness))+0.8618) <br />nc, <br />sso <br />ve Chronic 382 ug/1 a (0.8473(ln(hardness))+0.8699) <br />Table A-7a <br />Low Flows for Grassy Creek and Sage Creek, as well as Various Tributaries to Dry <br />Creek, Sa a Creek, Fish Creek and Grass Creek at the Seneca Coal Com an <br />Low Flew <br /> Annual Jun Feb filar 4pr aluy Jtni Jul 111 <br />- Sep Oct i1'ov Dee <br />(efs? 1 <br />lE3 <br /> 0 0 0 0 0 0 0 0 0 0 0 0 0 <br />Acute <br />30E3 <br /> 0 0 0 0 0 0 0 0 0 0 0 0 0 <br />Chronic <br />Appendix A Page 9 of 19 Last Revised 8/30/06 AN