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RECEIVED <br /> AGGREGATE NOV 12 2019 <br /> INDUSTRIES <br /> DIVISION OF RECLAMATION <br /> MINING&SAFETY <br /> November 8, 2019 <br /> Jared Ebert <br /> Environmental Protection Specialist III <br /> Colorado Division of Reclamation, Mining and Safety <br /> 1313 Sherman Street, Room 215 <br /> Denver, CO 80203Civic Center <br /> REE: Tucson South Resource, M-2004-044, Amendment Number 1 (AM01) Adequacy Review <br /> No. 3 <br /> Dear Jared, <br /> Our response to your Adequacy Review No. 3, September 24, 2019 is outlined below and <br /> follows the format and comments in the letter. <br /> Rule 6.4.7, Exhibit G, Water Information <br /> 15. Similar to the adequacy item for the mining plan section about wet-mining the South Area <br /> and dewatering operations. Please clarify if any dewatering will occur at the South Area? If <br /> dewatering is planned for this Phase, an evaluation of the impacts of this activity and possible <br /> mitigation measures will need to be addressed in this Exhibit. <br /> c. DRMS Response 2: The groundwater model conducted in 2004 does not reflect the plan to <br /> dewater the South Mine Area and Al notes there are four wells that could be impacted by the <br /> proposed dewatering operation (revised page G-2). Also, revised page G-5 indicates dewatering <br /> of the South Mine Area will likely impact wells west of the South Mine Area. Al's plan provides <br /> mitigation measures should the wells be negatively impacted. Given the proximity of these wells <br /> to the mining/dewatering operation and the shallow nature of the alluvial aquifer, it seems given <br /> that the adjacent wells will be negatively affected. Please assess and/or model the impact the <br /> dewatering operation will have on these wells and devise a plan to preemptively mitigate <br /> possible impacts to the use of these wells and/or provide a thorough demonstration the wells <br /> will not be impacted. <br /> d. Al Response: Al acknowledges that the wells near the South Mine Area will likely be <br /> impacted by the dewatering operations. The preemptive plan to address the potential impact will <br /> include the installation of cisterns on each of the nearby wells. Figure G-1 presents the <br /> preliminary design developed by Tetra Tech and a local driller familiar with the wells in the area. <br /> Aggregate Industries—WCR,Inc <br /> 1687 Cole Blvd Suite 300 <br /> Golden,CO 80401 <br />