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Mr. Douglas M. Ikenberry, P.E. <br />Page 2 <br />July 22, 2013 Doty & Associates, LLC <br />REFERENCES <br />CDPHE, 2013, Approval with Conditions of Request for Semi - Annual Groundwater <br />Monitoring Frequency (Doty & Associates, LLC letter dated October 27, 2012), <br />Keenesburg Ash Disposal Facility, letter to Mr. Donald MacDonald, Coors Energy <br />Company, from Mr. Douglas M. Ikenberry, Colorado Department of Public Health <br />& Environment, SW WLD /COO 4.3, January 15. <br />Doty, 2012, Request for Semi - Annual Groundwater Monitoring Frequency, Keenesburg <br />Disposal Site, letter to Mr. Douglas M. Ikenberry, P.E., Colorado Department of <br />Public Health & Environment, from B.P. Doty, Doty & Associates Project No. 302- <br />17, October 27. <br />DRMS, 2013, Keenesburg Strip Mine (Permit No. C- 1981 -028), Issuance - Technical <br />Revision No. 44 (TR -44), Revise Subsurface Water Monitoring Analysis from <br />Quarterly to Semi - annually, letter to Benjamin Moline, Coors Energy Company, <br />from Brock F. Bowles, Colorado Department of Natural Resources, Division of <br />Reclamation, Mining & Safety, June 4. <br />Weld, 2013, Coors Energy Services - Keenesburg Ash Monofill and Reclamation Site, <br />Approval of Groundwater Monitoring Reduced Sampling Frequency Request, letter <br />to Donald MacDonald, Coors Energy Company, from Mr. Troy E. Swain, Weld <br />County Department of Public Health & Environment, January 16. <br />