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4 <br />The mine site ceased active mining operations in 1995 and was subsequently placed in temporary cessation in <br />2001. The mine has been inactive from 1995 to date. Temporary cessation status ended in the second quarter of <br />2006, when the mine reactivated full water monitoring activities in anticipation of future reactivation of the mine <br />site, and because a bond release application was also being contemplated for the Utah Tract and Williams Fork <br />Strip Pit portions of the mine property. After the second quarter of 2013, the mine was again placed in temporary <br />cessation, as no near future mining activities were anticipated. No significant, unpredicted, or adverse <br />environmental impacts were noted during hydrologic monitoring for 2014. <br />The hydrologic balance is discussed in permit section 4.05.1. <br />Rule4.05.2 Water Quality Standards and Effluent Limitations <br />This is a review of Rule: 4.05.2(1); surface drainage from the disturbed area and of water discharged from <br />underground workings to surface waters. <br />Review of the 2014 AHR calls out Figure 2 as illustrating the location of underground discharge sediment ponds <br />and their relationship to AVF-5 an alluvial monitoring location. As per the 2014 AHR, CPDS Permit CO - <br />0034142 regulates discharge for the following three points: <br />a) Outfall 003 <br />b) Outfall 024 and <br />c) Outfall 022 <br />The AHR presents the data for these points in Table, a summary of hydrologic monitoring requirements for these <br />sites. Field parameters are outlined in Table 2. Water quality monitoring includes field parameters (Table 2), <br />surface water quality parameters (Table 3), and CDPS parameters (Table 4), which constitutes the monitoring <br />requirements page from CDPHE CDPS permit CO- 0042142. <br />A review of two years of Discharge Monitoring Reports submitted to the CDPHE indicate that samples were <br />taken and water quantity and quality were reported; no exceedances of the primary effluent limitations were noted <br />with the exception of one exceedance of iron in 2015 quarter three; and that reports were received quarterly and <br />filed with the Division within 90 days of sample collection. <br />The requirements of Rule 4.04.2(1) are adequately addressed. <br />Rule: 4.05.2(2) Sediment Pond Maintenance and Removal <br />This is a review of the rules relating to sediment ponds and other treatment facilities with respect to maintenance <br />and removal. <br />Section 2.05.4 of the permit describes the reclamation plan, and sediment pond maintenance and discusses the <br />points below. <br />Each of the ponds has a dewatering device located in its bottom. Once a pond is filled with settled solids, it will <br />be taken out of service and solids removed. The water that is drained from the pond will flow into a sump and <br />then be pumped from the sump into the first functioning pond of the system. This will prevent any discharge of <br />water containing elevated suspended solids, into the Williams Fork River. <br />Given the inactive status of the Mines, electrical power was shut -off in 2013, and active dewatering and <br />discharge ceased at that time. <br />According to Exhibit 18 of the permit, ponds 5A -P2 and 5A -P3 have been reclaimed at this time (2016). <br />Remaining sediment ponds and associated drainage structures will remain in place until final release, and will <br />then be removed. Soil materials salvaged from the pond areas will be used to reclaim the ponds. The ponds will <br />Williams Fork Mid Term Review Prepared by: R. Reilley <br />Date: February 2016 Document Location: M\\Coal\rar\MidTerm Reviews <br />