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Twentyrnile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970)879-3800 <br />August 24, 2015 <br />Ms. Christy Pickens <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 />Phone: (303) 692-3603 <br />RE: PERMIT CO -0027154; JULY 2015 DMR SUBMITTAL_ <br />Dear Ms. Pickens: <br />During the month of ,July 2015 the following Outfalls flowed: <br />Outfall 003A (Bond B) flowed each week of the month, <br />• Outfalls 005A/MON5 (all Pond D) flowed each week of the month. <br />• Outfall 006A (Pond E) flowed once in the middle of the month. <br />Only one exceedance was noted — it was for the 30 day average of total suspended solids (TSS) at site 006A. Only one <br />sample could be collected during the month as the site only flowed during one week of the month. The 30 day average for <br />TSS was 50 mg/l_ as opposed to the 30 day average limit of 35 mg/L. There was some precipitation about two days before <br />the sample was collected, which may account for the elevated TSS value (see attached weather data). The site has not <br />discharged from then, to date. <br />During the month the following Outfalls did not discharge. (DMRs with the "No Discharge" boxes checked off are attached). <br />• Outfall 002A (Pond T) <br />+ Outfall 004A (Pond C) <br />Outfall 007AIMON7 (all Pond F) <br />• Outfall 008A (Pond G) <br />Please call me directly: (970) 870-2750 with any questions. <br />Verytruly you , <br />. t h_ <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company <br />enclosures <br />cc: DRMS: CWPS Permit No. CO -0027154 file <br />