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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 /> 9. Instream CWQCC mine (WF2). <br /> Numeric Regulations 31 Data over time from the upstream site indicate the Williams Fork <br /> Standards and 37 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 CWQCC Not reviewed <br /> Narrative <br /> Standard for regulation <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 Exhibit 29; MCM appears to be sampling the surface water NPDES discharge <br /> monitoring CDRMS mining sampling permit C-1981- <br /> monitoring sites in accordance with their permit. <br /> frequency. 044 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 Exhibit 29 All required parameters appeared to be sampled. <br /> required CDRMS mining <br /> parameters permit C-1981- <br /> sampled. 044 <br /> 13. Prevention of Surface water features in the permit area consist of the Williams <br /> impacts to Fork and Yampa Rivers. The postmining land uses of <br /> surface water CDRMS rangeland/wildlife,pastureland and cropland can be expected to use <br /> that adversely regulation water for watering of wildlife and livestock. Mining and <br /> impact the 4.05.1(2) reclamation operations at the Williams Fork Mines do not appear to <br /> postmining land have impaired surface water for these uses. <br /> use. <br /> 14. Pond Report CDRMS All filing dates do not appear to have been met. The Division <br /> filing frequency. regulation received only the Q3 Sediment Pond Inspection for 2019. <br /> 4.05.9(17) <br /> 15. Timely filing of CDRMS Inadequate, at a minimum a note to DRMS of no discharge is <br /> pond reports regulation 4.05. required. <br /> 9(17) <br /> 16. Pond report CDRMS The sediment ponds associated with Williams Fork Mine in 2019 <br /> content regulation 4.05. comprise 5P1, 5P2, 5P3 (outfall 007); 5P5, 596, 5P7 (outfall 003); <br /> 9(17) 9AP1 (018); 9AP2 (019); 9AP3 (020; 9AP4 (021); 9P1 (024), <br /> Page 2 <br />