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B4sbop-Brogden <br />ASSOGPal2S, <br />Inc. <br />Water Consu(tan(s <br />acec <br />333 West Hampden Avenue Ste. 1050 Englewood, CO 80110 (303) 806-8952 Fax (303) 806-8953 bba@bbawater.com <br />May 31, 2002 <br />Mr. Mark Heffner <br />37 East Colorado Ave. <br />Denver, CO 80210 <br />RE: Transit Mix of Pueblo -Pueblo East Pit, Permit Number M-1986-015 <br />Dear Mark: <br />This letter presents our response to ground water issues raised in the May 6, 20021etter from the <br />Division of Minerals and Geology regarding Permit Number M-1986-015, and summarizes our <br />analysis and review of potential ground water impacts at the Transit Mix of Pueblo, Pueblo East Pit. <br />Our review and analysis focused on possible water level changes that may occur as a result of gravel <br />mining within Phase 1 of the proposed mining plan, and the possible impacts that those water level <br />changes may have on production wells within 600 feet of the Phase 1 mine boundary. To complete <br />this effort, we inventoried wells within 600 feet of the mine boundary, implemented a water level <br />and water quality monitoring program, and completed a modeling analysis to estimate water level <br />impacts resulting from mining. In addition, we completed a review of the status of each well <br />identified within 600 feet of the mine boundary. <br />The May 6, 2002 DMG letter states that the applicant must minimize disturbance to the prevailing <br />hydrologic balance of the affected land and the surrounding area, and that applicant shall minimize <br />impacts to neazby water wells. Transit Mix of Pueblo is planning to mine the Phase 1 area using <br />dewatering trenches, which will result in water level drawdowns in the alluvial aquifer near the pit. <br />Based on computer ground water modeling results, there is potential for some of these water level <br />drawdowns to reach existing wells completed in the alluvial aquifer. As summarized below, there <br />is one well that will be directly affected by mining, but Transit Mix of Pueblo is planning to replace <br />that well. Water level impacts can be mitigated to ensure that well users' water supplies are not <br />interrupted. The water level monitoring program will provide an early warning system if impacts <br />are greater than expected. <br />Michael A. Sayler Robert E. Brogden <br />Charles E. Stanzione Harold E Bishop <br />G. Ross Bethel <br />Christopher J. Sanchez <br />