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.4 <br />4y" ? <br />r <br />41- <br />May 26, 2010 <br />Ms. Tania Watson <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division - Permits and Enforcement <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />TWENTYMILE COAL COMPANY <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />RE: PERMIT COG-073311, Fish Creek Construction Crossing, Twentymile Coal Company, April 2010 <br />Dear Ms. Watson: <br />Enclosed, please find the above referenced discharge monitoring reports for April 2010. Note that I have not received DMRs <br />for this permit and have created an electronic version to provide data in the interim. This is a construction permit to install a <br />pipeline under Fish Creek on the mine property. <br />In April there were two exceedances relating to total suspended solids (TSS), 30 day average and maximum. Four water <br />quality samples were collected in April with TSS sequential results of 43, 302, 190, and 59 mg/L. The elevated values are <br />likely attributable to natural high flow erosion impacts along Fish Creek, and not from the pipeline construction. Historical data <br />on Fish Creek immediately upstream of 001A indicates elevated TSS values during high flows on this creek. I am in <br />communication with Nicole Rolfe regarding this situation. <br />Please contact me directly at (970) 870-2750 with any questions. <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company <br />enclosures <br />cc: DBMS, CDPS Permit No. CO-0034142 file