2023-05-25_PERMIT FILE - M2022048 (9)

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ENVIRONMENT, INC. PAGE 9 L.G. EVERIST, INC.-WEST FARM RESERVOIR ADEQUACY RESPONSE 01 MAY 23, 2023 The important area for mitigation lies along the eastern section of the south permit boundary line - the area along the Abbett Farms land. Exhibit G - Water has been revised and updated to include a mitigation plan based on the data collected to date and the Groundwater Model prepared by Schnabel. 24) Please provide proposed locations for installation of additional groundwater monitoring wells outside of the proposed slurry wall along the south side of Phase 1 to monitor for excessive mounding on the south side of Phase 1. Map Exhibit G-1- Water wells within 200 ft. map shows the locations of the 7 new monitoring wells to be installed outside the slurry walls for water quality testing and groundwater level collection. Wells 1, 2, 5 and 7 will also be sampled. The Molen report suggests collecting 5 quarters of water quality data from the 11 wells, which will be used to determine what chemical compounds need to be tested for, and as background for future comparisons. Once mining begins, the 11 wells will be tested yearly for the compounds determined to be relevant for this mine. 25) Please remove the statement on P28 that "There are no ditches that cross the property." Page 28 has been revised by removing this text. A copy of the revised page is enclosed. 26) Please remove the reference to the Ragsdale site in the first sentence of P32. Page 32 has been revised by replacing Ragsdale with West Farms. Thank you for noting this. A copy of the revised page is enclosed. 27) Please provide trend-line water level data charts for the existing 7 wells over the period of monitoring based on either. depth to groundwater from ground surface, or groundwater elevation based on surveyed well elevation data. Attached are the 7 graphs for the monitoring wells showing the surveyed ground elevation for each well, the data collected from 2019 to present and the average elevation line based on the last date a well was measured. The 2 foot plus or minus mitigation lines are also shown. A copy of the revised Exhibit G - Water is attached with the changes noted above. EXHIBIT H -Wildlife Information (Rule 6.4.8): 28) Please fully review and address the recommendations provided by Colorado Parks and Wildlife in their comment letter dated December 28, 2022.