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2021-03-02_REVISION - C1981044
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2021-03-02_REVISION - C1981044
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Entry Properties
Last modified
3/3/2021 7:50:50 AM
Creation date
3/2/2021 4:23:04 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981044
IBM Index Class Name
Revision
Doc Date
3/2/2021
Doc Name Note
Findings & Cost Estimate
Doc Name
Proposed Decision and Findings of Compliance
From
DRMS
To
Moffat County Mining, LLC
Type & Sequence
MT8
Email Name
RAR
JLE
Media Type
D
Archive
No
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Rule 4.05.2(1-4),(8): Water Quality and Effluent Limitations <br /> Information regarding sediment ponds and other treatment facilities comprise permit sections 4.05 and <br /> numerous exhibits as follows: <br /> o Exhibit 18 <br /> o Exhibit 29 <br /> o Exhibit 37 <br /> o Map 11 <br /> DRMS notes that two ponds in the Strip Pit were granted permanent stock pond status as per Exhibit 1813, <br /> by the Division of Water Resources through permitting action TR38 in 2021. <br /> No adequacy issues noted. <br /> Rule 4.05.80)-(3):Acid and Toxic-Forming Materials <br /> The information required by these rules is discussed on page 4.01-5, Sections 2.05.4, 2.04.6 and 2.04.7 <br /> and Exhibit 22. <br /> No adequacy issues noted. <br /> Rule 4.05.110)-(2):Groundwater Protection <br /> No adequacy issues noted,with the exception of those presented in Rule 4.05.13(1),below. <br /> Rule 4.05.13(l):Ground Water Monitoring <br /> DRMS's review of the 2019 Annual Hydrology Report(AHR), and the permit document identified <br /> several issues regarding ground water monitoring frequency. <br /> DRMS finds that page 2.04-5 of the permit states that the current summary of hydrologic monitoring sites <br /> are identified in Tables 3A parts 1 through 3. Table 3A part 2 indicates that the shallow alluvial wells <br /> AVF-3, 5, and 6 are to be sampled quarterly for water quality. In Exhibit 29 Table 1 the same wells are <br /> indicated to be sampled annually for water quality. Table 1B appears identical to Table 3A Part 2 in the <br /> list of tables that was revised in 1988. The 2019 AHR indicates that AVF6 was not monitored or sampled <br /> during the first quarter. In Table 17 the AHR states this well was damaged but no further explanation was <br /> provided. <br /> 16. Please provide the missing data for well AVF-6,as outlined in the permit monitoring <br /> requirements. Also,assure going forward that the monitoring information is provided in future <br /> AHRs. <br /> 17. The sampling frequency discrepancy of alluvial wells AVF-3, 5 and 6 should be researched and <br /> corrected as needed. Please resolve these discrepancies with revised pages updating the <br /> necessary text and associated tables. <br /> DRMS finds that page 2.04-22 of the permit states that YAW wells and proposed YAW wells will be <br /> monitored. The sampling frequency of these wells is depicted on Table 3 part 2. Table 3 was replaced <br /> with Table 3A parts 1 through 3 and those tables do not reflect a sampling frequency for the YAW wells. <br /> However,Exhibit 29 Table 3A indicates the YAW wells are to be monitored and sampled annually. <br /> Exhibit 29,Table 3A(Ex29-8A),of the permit indicates that YAW 1,2, 5 and 6 are alluvial wells that <br /> requiring sampling. These wells were not sampled during 2019 and are missing from the Table 1B in the <br /> AHR. Review of the 2019 AHR indicates that wells 1,2, 5 and 6 are missing from Table 1B of the AHR. <br /> 18. MCM needs to determine if the YAW alluvial wells need to be sampled or not. Please resolve <br /> this discrepancy in these tables with revised pages. <br /> 19. Please correct the AHR Table 1B for future submissions. <br /> 20. Please provide the missing data as outlined in the permit monitoring requirements or a <br /> discussion of why these wells were not sampled. <br /> Williams Fork Mines C1981044 -9- 2 March 2021 <br /> Mid Term Review 8 <br />
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