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~~ ~• <br />COLORADO DEPARTMENT OF H TH, Water Quality Control Division <br />Rationale - Page 7. Permit No. GO-0024562. <br />B. Compliance with Terms and Conditions of Previos Permit (continued) <br />In early 1488, the permittee had a series of silver violations. An <br />analysis of the lab acid found nitric acid used for total silver <br />sample analysis to be contaminated. Once the problem was confirmed <br />and a change in acid made, the significant silver violations ceased. <br />Sporadic silver violations unrelated to this incident are limited to <br />silver values close to the detection limit of 0.0002 mg/1 and did not <br />exceed the widely accepted quantification level of 0.0005 mg/1. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />A. Effluent Limitations <br />In developing suitable effluent limitations, the Division must review <br />all applicable standards and regulations and apply that which is more <br />stringent. This review includes, but is not limited to, the water <br />quality standard based effluent limitations, federal guidelines and <br />standards (40 CFR Subchapter N) and State Effluent Regulations <br />(10.1.0). Such a review has been done for this facility. The <br />following limits will apply for discharge points 001 and 002 and are <br />discussed below. <br />Table VI-1 -- Effluent Limits for discharge flows less than 2.58 MGD - no <br />active mining or exploration. <br />Parameter Limit Rationale <br />Flow, MGD 2.58 Design <br />TSS, mg/1 30/45 b/ State Effluent Regulations <br />pH, s.u. 6.5-9.0 d/ Water Quality Standards <br />Oil and Grease, mg/1 10 c/ State Effluent Regulations <br />Potentially Dissolved <br />Silver, mg/1 0.0008/0.0212 e/ Water Quality Standards <br />Potentially Dissolved <br />Zinc, mg/1 0.13011.00 e/ Water Quality Standards <br />Potentially Dissolved <br />Lead, mg/1 0.030/0.920 e/ Water Quality Standards <br />Potentially Dissolved <br />Copper, mg/1 0.059/0.098 e/ Water Quality Standards <br />Whole Effluent Toxicity, Acute <br />through March 31, 1995 Report c1 State Permit Regulations <br />beginning April 1, 1995 50%/IWC--37.0% c/ State Pec~it Regulations <br />Whole Effluent Toxicity, Chronic <br />through June 30, 1 995 Report c/ State Permit Regulations <br />a/ 30-Day Average <br />J 30-Day Average/7-Day Average <br />~/ Daily Maximum <br />Minimum-Maximum <br />e/ 30-Day Average/Daily Maximum <br />