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Oa~JO/98 FRI 15:39 F.+~L 301 7820390 CDPREi6pCD ((!1003 <br />COLORADO DEPARTMENT OF PUBLIC HFi1LTH AND ENV/RONM£NT, Water Quality Control Division <br />Ammdmmt No. 3-Rationale. Page 3, Permit No. CO-0000132 <br />Table <br />Limitaliotts and Attalytieal Results (temporary outfall Oll) <br />(ad dis unless Aardneas Standard Conc. Flow Flow Limitation Restdts <br />otherl¢!ae noted) M3 MI QI Q2 M2 <br />Metal CriAeria mgR ug/1 ug/l efs cfs ug/1 ug/I <br />Arsenic As-A (TR) 69 360 / 41 0.45 33068.89 < 1000 T <br />As-C (TR) 69 150 1 4I 0.45 13725.56 <l000 T <br />Cadmium Cd-A (trout 69 2.58 0 41 0.45 23771 <SO <br />Cd-C 69 0.85 0 41 0.45 78.07 <SO <br />Cr Ill Cell/-A 69 1281.43 41 0.45 118034.10 G SO T <br />Crlll-C 69 152.74 41 0.45 Is069.00 <SO T <br />C~ V! CrV/-A 69 16 4l 0.45 1473.78 <50 T <br />CrVI-C 69 Il 4I 0.45 1073.22 <50 T <br />Copper Cu-A 69 11.50 0 41 0.45 1151.67 no result <br />Cu-C 69 8.61 0 47 0.45 793.17 no result <br />Iron Fe-C ('112) 69 1000 220 41 0.45 71066.67 1200 <br />Lead Pb-A 69 52.65 0 41 0.45 4849.50 < 700 <br />Pb-C 69 2.30 0 41 0.45 2!1.82 < 700 <br />Manganese Mn-C (IR) 69 1000 34 41 0.45 89013.33 < 100 T <br />Mercury Hg-C(IR) 69 0.01 0.1 41 0.45 0.01^ 0.4 T!• <br />Nickel K-A 69 697.79 0 41 0.45 64274.39 no result <br />Ni-C 69 72.09 0 41 0.45 6640.33 no result <br />Selenium Se-A (!R) 69 20 0 41 0.45 1841.21 < 1000 T <br />Se-C (IR) 69 5 0 4J 0.45 460.56 < 1000 T <br />Silver Ag A 69 1.08 0 41 0:45 99.05 <50 <br />Ag-C(trout 69 0.04 0 41 0.45 3.65 <50 <br />Zino Tit A 69 85.45 4 41 0.45 7506.66 <100 <br />7s-C 69 77.40 4 4l 0.45 6764.75 <100 <br />T menus an analysis for the rota! meta) was performed and reported <br />TR means the Total Rernverable fraction of the parameter <br />• The calcu/ored result was negative. In such cases, the limitation i.s set equal ro the .standard. <br />'• The reportable concentration for this parameter is 0.2 ug/l. It is likely that this reported valor of 0.4 ug/l u a false <br />positive'. The Division will require a second sample for eonjermarion. <br />In order (o calculate water qualiry• standard based limits for this discharge, a mass balance analysis vvas performed by <br />the Division. The mass balance equation is used to determine the ejJiuent concentrations that would nor vioklle the <br />allowable in-stream concentrations defined by the WQ standards (arcept in the case of pH, where the limits art set <br />directly from stream standanls or efflueN regulations without ruing a mass balance approach). The mas s balance <br />equation is: <br />M, = MaQr - M~Q, <br />Q: <br />