2021-03-02_REVISION - C1981044 - Laserfiche WebLink

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