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3 <br />COLORADO DEPARTMENT .OF HEALTH, Water Quality Control Division <br />Rationale - Page 7. Permit No. CO-0000132. <br />VI. TERMS AND CONDITIONS OF PERMIT <br />2. Applicable Federal Effluent Guidelines and Standards: The federal <br />guidelines which apply to this type of facility are found under 40 <br />CFR 434, the Coal Mining Point Source Category. The limitations <br />which apply are: <br />Table VI-3 - Federal Standards <br />Avg, of Daily Values <br />Parameter for 30 Consecutive Days Daily Maximum <br />T. Suspended Solids, mg/1 (BPJ, NSPS) 35 70 <br />Total Iron, mg/1 (NSPS) 3.0 6.0 <br />Total Iron, mg/1 (BAT) 3.5 7.0 <br />Settleable Solids, ml/1 (Precip. Events) NA 0.5 <br />The above federal limits are from Subpart D of 40 CFR 434, Alkaline <br />Mine Drainage, Best Available Technology (BAT) (434.43) and New <br />Source Performance Standards (NSPS) (434.45) and Subpart F, <br />Miscellaneous Provisions, Effluent Limitations for Precipitation <br />Events (434.63). <br />Discharge points 003, 004, 005, 006, 007, 009 and 010 are existing <br />sources, and the discharge consists only of surface runoff. <br />Therefore, the BAT and BPJ limits apply, as well as the Effluent <br />Limitations for Precipitation Events. <br />Discharge point 011 is a new discharge and thus falls under the new <br />source standards, and will .discharge mine water only. Therefore, <br />the NSPS limits apply. <br />a) Active Mining - discharge points 003, 004, 005, 006, 007, 009 <br />and 010: Limitations for pH and oil and grease apply to all <br />d~isc~i iges, regardless of precipitation conditions. <br />Additionally, TSS and total iron samples should always be <br />taken. If the results of the analyses exceed the permit limit, <br />the permittee may submit documentation proving that the <br />discharge was precipitation induced. The proof of the size of <br />the precipitation event consists of: <br />(1) rain gauge data or the volume of water contained in the <br />snow, based upon calculations from actual snow samples; <br />(ii) the sample results for TSS, iron, pH, settleable solids and <br />oil and grease; and <br />(iii) influent/effluent flow. <br />