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.COLORADO DEPARTMENT OF PUBLIC HEALTH AND ENVIRONMENT, Water Quality Control Division <br />Amendment No. 3-Rationale. Page 3, Permit Na. CO-0000132 <br />Table V-1--Standards, Limitations and Analytical ResuUs (temporary outfall 011) <br />--ML~IA.LJ'-- WQ Upstream Upstream I;jfluent Effluent Analytical <br />(aft dis unless Hardness Standard Conc. Flow Flow Limitation ResuUs <br />otherwise noted) M3 MI QI Q2 M2 <br />Meta[ Criteria mg/l ug/1 ug/! cjs ejs ug/l u8/l <br />Arsenic As-A (TR) 69 360 1 41 0.45 33068.89 <1000 T <br /> As-C (TR) 69 150 1 41 0.45 /3725.56 < 1000 T <br />Cadmium Cd-A (trout 69 2.58 0 41 0.45 237.71 <50 <br /> Cd-C 69 0.85 0 41 0.45 78.07 <50 <br />Cr I// CrI1!-A 69 1281.43 4I 0.45 118034.10 <50 T <br /> Crlll-C 69 152.74 41 0.45 14069.00 <50 T <br />Cr VI CrV/-A 69 16 41 0.45 1973.78 <50 T <br /> CrVI-C 69 11 41 0.45 1013.22 <50 T <br />Copper Cu-A 69 12.50 0 41 0.45 1151.67 no result <br /> Cu-C 69 8.61 0 41 0.45 793.17 no result <br />/ton Fe-C (TR) 69 1000 220 41 0.45 72066.67 1200 <br />Lead Pb-A 69 52.65 0 41 0.45 4849. SO < 700 <br /> Pb-C 69 2.30 0 41 0.45 211.82 < 700 <br />Manganese Mrt-C (TR) 69 ]000 34 4l 0.45 89013.33 <!00 T <br />Mercury Hg-C (IR) 69 0.01 0.1 4] D.45 0.01 * 0.4 T** <br />Nickel Ni-A 69 69779 0 41 0.45 64274.39 no restelt <br /> Ni-C 69 72.09 0 4] 0.45 6640.33 na result <br />Selenium Se-A (TR) 69 20 0 41 0.45 1842.22 <l000 T <br /> Se-C (772) 69 5 0 41 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 4l 0.45 3.65 <50 <br />Zinc Zn-A 69 85.45 4 41 0.45 7506.66 < 100 <br /> Zn-C 69 77.40 4 41 0.45 6764.75 <100 <br />T means an analysis for the total meta! was performed and reported <br />TR means the Total Recoverable fraction of the parameter <br />* Tl:e calculated result was negative. In such cases, the [imitation is set equal to the standard. <br />** The reportable concentration for this parameter is 0.2 ug/l. It is likely that this reported value of 0.4 ug/l is a 'false <br />positive ". The Division wit[ require a second sample for cahrmation. <br />/n order ra calculate water quality standard based limits for this Aiscl:arge, a mass balance anatvsis was performed by <br />Ute Division. T/te mass balance equation is used to determine the effluent concentrations that world not violate the <br />allowable in-stretrrn concentrations deftned by the WQ standards (except in the case of pH, inhere the limits nre set <br />directly from stream stnrtdar~fs or efjluertt regulaliorts without using a mass balance erpproach). The mass balance <br />equation is: <br />M, = M.rQ~ - IVI,Qr <br />Qz <br />