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OOI,012AD0 DEPARTMEtlf OF HEALTH, water Quality Control Division <br />Rationale - Page 3. Permit No. CO-0029599 <br />Appendix A <br />Water quality standard (WQS) based effluent limitations are calculated using <br />the follocring mess balance formula: <br />EL = WQS (~_lp + Qom) - (Q;_10 ~ CAhID) <br />QEF' <br />Where: <br />EL = Calculated effluent limitation (+og/1) <br />~ = Applicable cater quality standard (mg/1) <br />Q7-10 = Receiving cater 7-day, 10-year loc floc (0.2 cfs) <br />Q~ = Maximum effluent flout c 0.144 MGD or 0.223 cfs (001) <br />= 0.115 MGD or 0.178 cfs (007) <br />CAS =Ambient instream concentration (mg/1): not available <br />Below is the calculation for both metal parameters. <br />EL = 1.0 (0.2 + 0.223 + 0.178) = 1.5 mg/1 (for 001 and 007) <br />0.223 + 0.178 for Total Recoverable Iron <br />EL = 0.001 (0.2 + 0.223 + 0.178) = 0.0015 mg/1 (for 001 and 007) <br />0.223 + 0.178 for Total Recoverable Cadmium <br />The xater quality of the seep T,ater prior to treatment is as follocs, as <br />collected from two samples on May 3, 1988: <br />Parameter <br />Floc, gpm <br />aH, s. u. <br />TSS, mg/1 <br />T.R. Iron, mg/1 <br />T.R. Caomium, mg/1 <br />Oil & Grease, mg/1 <br />TDS, mg/1 <br />Concentration <br />8.3/16,1 <br />6.86/6.83 <br />2205/1905 <br />135.2/130.4 <br />0.00081/0.00078 <br />k5.0/k5.0 <br />3615/3700 <br />