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<br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />RECEIVED `970'6'9-38°° <br />OCT 312005 <br />ONIe1D11 of Mmerah and Geology <br />October 27, 2005 <br />Mr. Jeff Coombe <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 />RE: PERMIT CO-0042161; 3rd QUARTER 2005 DMR SUBMITTAL <br />Dear Mr. Coombe: <br />C ~q ~Z-OS~ <br />Please find enclosed the above referenced discharge monitoring reports for the period from July 1, <br />2005 through September 30, 2005, for Outtalls 001A (site 115), 002A (300E), and 3001. Outfall 001A <br />did not discharge during the period. Attached are blank DMRs for this Outtall with the No Discharge <br />box checked. <br />Outfalls 002A did not flow during the month of July, flowed during the last week of August, and flowed <br />during the first, second, and fourth weeks of September, therefore sample sets for 002A and 3001 could <br />only be collected for the months of August and September. <br />Note one permit exceedance for % BOD removal under 002A. Renewed flow during the last two days <br />in August indicated an 82.8 % removal, while the minimum permit limitation is 85%. The reason for this <br />is that influent flow to the waste water treatment system enters in peaks (due to shift changes and <br />showering). Due to this greywater flow dilution, influent BOD and TSS are often relatively low to start <br />with, thus, it can be difficult to meet the minimum BOD % removal limitation. However, despite not <br />meeting the % removal in August, the post treatment BOD, TSS, and fecal numbers were still very low. <br />I have attached copies of the laboratory reports for your review. <br />Other items to consider are that: <br />Flow at 200A only started during the last two days in August, and was of short duration. <br />During the following month of September, we had a 99.1 % BOD removal. <br />Treated water is not discharged to any surface streams, but is discharged back underground <br />into abandoned mine workings, where it is further diluted by underground water. <br />