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DiNatale <br /> WATER CONSULTANTS <br /> MEMORANDUM <br /> TO: Steve Kelton (Brannan Sand and Gravel Company) <br /> FROM: Chris Newton (DiNatale Water Consultants) <br /> SUBJECT: Nix Site Groundwater Contamination Potential <br /> DATE: March 31, 2023 <br /> The Nix Sand and Gravel Mine (Nix Site),permit M2001-046, is operated by Ready Mixed <br /> Concrete Company, LLC (RMCC). RMCC submitted Technical Revision 2 (TR2) to the <br /> Division of Reclamation, Mining and Safety (DRMS) on March 2, 2023. DRMS provided a <br /> letter,Adequacy Review 1, dated March 10, 2022, listing their concerns with the TR2 <br /> submittal. This memorandum provides an analysis of the hydrogeologic conditions present <br /> at the Nix Site and details the lack of significant impacts that the Nix Site is likely to have on <br /> groundwater quality in the area with respect to existing rules, regulations, and the <br /> permitting requirements at other nearby sites. <br /> 1. SITE DESCRIPTION AND GEOLOGY <br /> The Nix Site will contain unlined ponds,the freshwater and overflow ponds, in Cell 1 and <br /> the remaining cells will be effectively separated from the groundwater system by the <br /> installation of slurry walls prior to mining operations (Figure 1). The Nix Site is adjacent to <br /> several other sand and gravel mining operations that demonstrate the resource potential of <br /> the area and the lack of any significant known impacts or concerns regarding water quality <br /> in the area. <br /> 01'�00 <br /> 303 709 7044 dinatalewater.com <br /> 5777 CENTRAL AVENUE SUITE 228 BOULDER CO 8030) <br />