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L Lewicki 8r Associates <br /> ENGINEERING I GEOLOGY I ENVIRONMENTAL <br /> April 11, 2024 <br /> Eric Scott 'k 6 �'��� P��ON <br /> Colorado Division of Reclamation, Mining, and Safety �Q �Gx-N-til <br /> 1313 Sherman St, Rm. 215 N OF o SPF <br /> Denver, CO 80203 V�vM0- PN <br /> Delivered Via Email <br /> RE: Ewing Gravel Pit, DRMS File M2023-033 <br /> Technical Revision 01 —Baseline Groundwater Data <br /> Mr. Scott <br /> In accordance with the approval of M-2023-033, BURNCO Colorado is submitting the attached <br /> completed package of groundwater data describing the baseline conditions at the Ewing Gravel <br /> Mine. This data was gathered over five quarters. Proposed water quality limits are either state <br /> standards as described in Water Quality Regulation 41 or Numeric Protection Levels (NPL) <br /> based on the baseline groundwater quality data. <br /> The attached pages will replace the appropriate portions of Appendix G-2 with complete <br /> baseline data. <br /> Please contact my office with any questions you have. <br /> Regards, <br /> / <br /> /.. — f <br /> Ben Langenfeld, P.E. <br /> Lewicki &Associates, PLLC <br /> (720) 842-5321, ex. 1 <br /> benl(a lewicki.biz <br /> i <br /> i <br /> 0 <br /> Ewing Gravel Pit <br /> April 2024 1 ill Lewicki&Associates <br />