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ENERGY COMPANY <br />cninrM rnlnc ^nn -- <br />February 12, 2013 <br />Brock Bowles, Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />RE: Technical Revision No. 44 <br />Revision for Subsurface Water Monitoring Analysis schedule from quarterly to <br />semi - annually <br />Permit No. C- 1981 -028 [Keenesburg Mine] <br />Dear Mr. Bowles: <br />RECEIVED <br />F EB 1 '7 20 <br />Division of Reclamation, <br />Alta -hog & Safety <br />Coors Energy Company (CEC) is submitting a technical revision (TR -44) application to the <br />Keenesburg Mine permit to revise the Subsurface Water Monitoring Analysis schedule from <br />quarterly to semi - annually. <br />The contents of the TR -44 application include a letter request for Semi - Annual Groundwater <br />Monitoring Frequency from Doty & Associates, LLC dated October 27, 2012, a letter of approval <br />from the Colorado Department of Public Health and Environment dated January 15, 2013, a <br />letter of approval from Weld County Department of Public Health & Environment's <br />Environmental Services Division dated January 16, 2013, proposed Public Notice for TR -44 and <br />revised Page 56 (Permit text). <br />The notice will be placed in the local newspaper when CEC receives concurrence from DRMS as <br />to format and content. Copies of the Technical Revision 44 Application will be delivered to <br />Keenesburg Town Hall and to the Weld County Clerk and Recorder's office for public review <br />once approval is received, and concurrent with publication of the Public Notice. <br />CEC believes that the documentation herein submitted is complete and sufficient for the <br />processing of this Technical Revision No. 44. However, should there be questions, please <br />contact us at 303 944 -8166. <br />