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Mr. Douglas M. Ikenberry, P.E. <br />Page 5 <br />October 27, 2012 <br />* <br />I trust that foregoing is complete enough for your review and approval. Please call if you <br />have any questions or need additional information. Your prompt attention to this matter <br />is much appreciated. <br />cc: Mr. Roger Doak, CDPHE <br />Mr. Trevor Jiricek, Weld County <br />Mr. Troy Swain, Weld County <br />Mr. Brock Bowles, DRMS <br />Mr. Donald W. MacDonald, Coors Energy Company <br />REFERENCES <br />Sincerely, <br />DOTY & ASSOCIATES, LLC <br />f � <br />Doty & Associates, LLC <br />Benjamin P. Doty, P.E. <br />Doty, 1998, Ground -Water Monitoring Plan, Keenesburg Ash Disposal Site, Revision 2.0, <br />prepared for Coors Energy Company, Doty & Associates Project No. 302 -15, <br />October 1. <br />Doty, 2001, Alternative Source Demonstration, Statistically Significant Increase Over <br />Background, Iron in AMW -1 and SMW -2 Samples, Keenesburg Disposal Site, <br />letter to Mr. Douglas M. Ikenberry, P.E., Colorado Department of Public Health & <br />Environment, from B.P. Doty, Doty & Associates Project No. 302 -17, June 14. <br />Doty, 2005, Alternate Source Demonstration, Statistically Significant Increase over <br />Background, Manganese in SMW -2, Fourth Quarter 2004, Keenesburg Disposal <br />Facility, Coors Energy Company, letter to Mr. Douglas M. Ikenberry, P.E., <br />Colorado Department of Public Health & Environment, from B.P. Doty, Doty & <br />Associates Project No. 302 -17, April 8. <br />Doty, 2008, Request for Revised Ground -Water 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, June 3. <br />