2001-12-11_PERMIT FILE - C1981044A (3)

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• COLORADO DEPARTMENT OF HEALTH Water Quality Control Division 4210 East 1Lth Avenue Denver, Colorado 80220 RATIONALE AMENDMENT NO.: 1 EMPIRE ENERGY CORPORATION EAGLE MINE COMPLEX PERMIT NUMBER CO-0034142 ROUTT COUNTY By letter of May 23, 1986, the permittee has requested authorization to discharge Erom the No. 6 Mine. In the same letter, the permittee stated chat mining activities have ceased at No. 9 (outfall 002) and no Future discharge will occur. Mining at the No. 9 Mine actually ceased in March, 1985. The portal will be sealed by September, 1986. The No. 6 Mine is a new portal in the E-seam which will be opened soon. • Initially, no wastewater is expected to be encountered. Within six months, a flow of around 7 gpm is anticipated, and by the fifth year a maximum of 128 gpm should be discharged. By year Z0, the effluent flow is expected to be 787 gpm. The No. 6 Mine will utilize existing treatment and discharge through existing outfall 003, the same outfall used by No. 5 Mine. As stated above, outfall 002 will no longer exist. The permittee plans to recontour after the portal is sealed, and eventually discharge from a surface runoff pond at the same physical point as outfall 002. The new outfall will be assigned a new outfall number to avoid confusion. EFFLUENT LIMITATIONS DETERMINATION: 'fhe existing limitations Eor outfalls 002, 003, and 022 were determined through a mass balance using the total combined maximum flow for the three nucEaLls. Outfall 002 no Longer discharges and will be eliminated by this permit amendment. No. 6 Mine will begin discharging through outfall 003. New limitations are being calculated in the same manner using the new combined maximum flows (No. 5 Mine = 2000 gpm, No. 6 Mine = L28 gpm, outfall 022 = 112 gpm, total = 2240 gpm). The same ambient data utilized in prior calculations is being used to determine new limitations. Those limitations are shown in Table 1. See Appendix A Eor specific calculations.