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<br /> <br />Blue Mountain Energy, Inc. WWTP Water Quality Assessment CO-0038024 <br />Hardness =Calcium concentration * 2.497 + Magnesium concentration * 4.116 <br />Using this approach, the mean hardness of 254 mg/1 was computed. This hardness value and the <br />formulas contained in the TVS were used to calculate the in-stream water quality standazds For <br />metals for stream segnent COLCWRI2 with the results shown in Table A-4. <br />Table A-4 <br />Site-Specific Metals Water Quality Standards For CO-0038024 <br />For Stream Segment COLCWRI2 <br />Based on the Table Value Standards Contained in the Colorado Department of Public Health <br />and Environment Water Quality Control Commission Re [anon 37 <br />Calculated Using the Following Value for Hazdness as CaC03: 254 m 1 <br />1 <br />ACUYe 12 ug/1 [1.13667-0.04184fi(hardness)][e(1'126(In(hardness)}3.6867)] <br />Cadmium, Dissolved <br />L_'hrOillC 4.5 Ug/l [LI0167-0.04184In(hardness)](e (0.7852(In(hardness)}2.715)] <br />Hexavalent Chromium, Acute 16 u 1 Numeric standards provided, formula not applicable <br />D18801Ved - (-'}rrOn1C <br />g/ <br />11 n 1 Numeric standards rovided, Formula not <br />p applicable <br /> <br />Di <br />l <br />d Acute 32 LL 1 e (0.9422Qn(hardness)}1.7408) <br />Copper, <br />sso <br />ve ChrOri1C 20 llg/1 e(0.8545(In(hardness)}1.7428) <br /> <br />l <br />d <br />d <br />i Acute 175 UgII [L46203-0.I457121n(hardness)][e (1.273 (In(hardness))-L46)] <br />sso <br />Lea <br />, D <br />ve d <br /> CIrrOffiC 6.$ ug/I ness)}4.705)] <br />[1.46203-0.7457121n(harlness)][e t1173(In(her <br /> <br />k <br />Di <br />d <br />i Acute 1030 ugJl e (0.846Qn(hardness)}F2.253) <br />el, <br />ssolve <br />N <br />c +0 <br />4 <br /> ChI'On1C 114 u 1 ,055 <br />) <br />e (0.846Qn(hazdness)) <br /> Acute 1$ LLg/1 Numeric standards provided, formula not applicable <br />Selenium, Dissolved <br /> Chronic 4.6 LLg/1 Numeric standards provided, formula not applicable <br /> <br />i <br />d ACllCe 10 llg/1 ~s e [I.72(In(hardness)}6.52) <br />ssolve <br />Silver, D h <br />9 <br /> Chrome 1.6 Ug/l e(I]2(In( <br />ardness)} <br />.06) <br /> <br />l Acnte 25$ Ug/1 e(0.8473(In(hardness))~0.861 B) <br />Zinc, Disso <br />ved <br /> Chronlc 260 ug/1 e(0.8473Qn(hardness))t0.8699) <br />Amendments to the Classifications and Numeric Standards for Lower Colorado River Basin that <br />become effective on February 20, 2002, will modify the TVS equations applicable to stream segment <br />COLC WR12. This WQA has been developed to reflect the water quality standazds based on the new <br />TVS equations, which are expected to be in effect at the time of issuance of the renewal permit. <br />a <br />P <br />L <br />• Appendix A Page 6 of IS <br />