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DOTY & ASSOCIATES, LLC <br />ENVIRONMENTAL, GROUNDWATER AND WASTE MANAGEMENT ENGINEERS <br />1440 BRICKYARD ROAD <br />SUITE 1 <br />http: / /www.dotyeng.com <br />GOLDEN, COLORADO 80403 -8054 <br />bpdoty@dotyeng.com <br />VOICE: (303) 279 -9181 <br />RECEIVED <br />FAX: (303) 279 -9186 <br />JUL 2 6 2013 <br />MWO OF TION <br />July 22, 2013 <br />302 -17 <br />Mr. Douglas M. Ikenberry, P.E. <br />Colorado Dept. of Public Health & Environment <br />Mail Code HMWMD- SWIM -B2 <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80246 -1530 <br />Subject: Implementation of Semi - Annual Groundwater Monitoring <br />Keenesburg Disposal Site <br />Dear Mr. Ikenberry: <br />This letter is a notification that the above referenced facility has begun monitoring <br />groundwater on a semi - annual basis. <br />We requested that the groundwater monitoring frequency be changed from quarterly to <br />semi - annually in Doty (2012). Approvals were issued by your Division (CDPHE, 2013), <br />Weld County (Weld, 2013) and the Division of Reclamation, Mining & Safety (DRMS, <br />2013). Having received these approvals, the facility has now implemented semi - annual <br />groundwater monitoring (samples will be collected in April and September). <br />I trust that this letter provides adequate documentation of the monitoring schedule <br />change. Please call if you have any questions or need additional information. <br />Sincerely, <br />DOTY & ASSOCIATES, LLC <br />//' "47 - <br />Benjamin P. Doty, P.E. <br />cc: Mr. Troy E. Swain, Weld County <br />Mr. Brock F. Bowles, DRMS <br />Mr. Benjamin Moline, P.E., Molson Coors Brewing Company <br />Mr. Danny Kipp, Coors Energy Company <br />