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2021-05-06_REPORT - C1981044
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2021-05-06_REPORT - C1981044
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Last modified
5/6/2021 2:37:44 PM
Creation date
5/6/2021 2:26:52 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Report
Doc Date
5/6/2021
Doc Name
Annual Hydrology Report Adequacy Review
From
DRMS
To
Twenty Mile Coal, LLC
Annual Report Year
2019
Permit Index Doc Type
Hydrology Report
Email Name
RAR
JLE
Media Type
D
Archive
No
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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 />
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