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The Williams Fork Mines are located on Segment 13b of the Lower <br />Yampa/Green River Sub -basin of the Lower Colorado River Basin. <br />CWQCC lists numeric standards for Segment 13b in its regulation <br />37. The permitee monitors water in the Williams Fork River at a <br />site upstream of the mine (WF1), and a site downstream from the <br />mine (WF2). <br />9. Instream <br />CWQCC <br />Numeric <br />Regulations 31 <br />Data over time from the upstream site indicate the Williams Fork <br />Standards <br />and 37 <br />River naturally exceeds the numeric standard for iron frequently, <br />and occasionally lead and manganese standards. <br />Comparisons of the upstream and downstream data indicate mining <br />and reclamation operations at the Williams Fork Mines do not cause <br />the exceedances. <br />10. Interim <br />CWQCC <br />Not reviewed <br />Narrative <br />regulation <br />Standard for <br />41.S.C.6 <br />Ground Water <br />MCM monitors the Williams Fork river upstream of the mine site at <br />monitoring station WF 1 and downstream of the mine site at WF2. <br />These sites were monitored in accordance with the approved <br />sampling plan. Additional monitored surface water sites comprise <br />mine discharge points (NPDES 9003 and #024) and spoil spring <br />1SP (NPDES 9022). <br />11. Surface water <br />Exhibit 29; <br />MCM appears to be sampling the surface water NPDES discharge <br />monitoring <br />CDRMS mining <br />monitoring sites in accordance with their permit. <br />sampling <br />permit C-1981- <br />frequency. <br />044 <br />Terminology throughout the AHR, and DMR's for sample sites is <br />confusing because of inconsistent use of various terms. Sometimes <br />NPDES outfall is used, other times station name is used. Please in <br />the future use consistent terminology between water quality permit, <br />DMRs, Williams Fork monitoring location map and Williams Fork <br />Permit. <br />12. Surface water <br />Exhibit 29 <br />All required parameters appeared to be sampled. <br />required <br />CDRMS mining <br />parameters <br />permit C-1981- <br />sampled. <br />044 <br />13. Prevention of <br />Surface water features in the permit area consist of the Williams <br />impacts to <br />Fork and Yampa Rivers. The postmining land uses of <br />surface water <br />CDRMS <br />rangeland/wildlife, pastureland and cropland can be expected to use <br />that adversely <br />regulation <br />water for watering of wildlife and livestock. Mining and <br />impact the <br />4.05.1(2) <br />reclamation operations at the Williams Fork Mines do not appear to <br />postmining land <br />have impaired surface water for these uses. <br />use. <br />14. Pond Report <br />CDRMS <br />All filing dates do not appear to have been met. The Division <br />filing frequency. <br />regulation <br />received only the Q3 Sediment Pond Inspection for 2019. <br />4.05.9(17) <br />15. Timely filing of <br />CDRMS <br />Inadequate, at a minimum a note to DRMS of no discharge is <br />pond reports <br />regulation 4.05. <br />required. <br />9(17) <br />16. Pond report <br />CDRMS <br />The sediment ponds associated with Williams Fork Mine in 2019 <br />content <br />regulation 4.05. <br />comprise 5P1, 5P2, 5P3 (outfall 007); 5P5, 596, 5P7 (outfall 003); <br />9(17) <br />9AP1 (018); 9AP2 (019); 9AP3 (020; 9AP4 (021); 9P1 (024), <br />Page 2 <br />