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Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 1V2:D <br />October 28, 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 />Phone: (303) 692-3603 <br />N0'%V C 312 fl 10 <br />Division Of h0u.;';;0'9V0n, <br />1L4'inm9 and :e.,ty <br />RE: PERMIT CO-0027154; SEPTEMBER/THIRD QUARTER 2010 DMR SUBMITTAL <br />Dear Ms. Watson: <br />During the month of September 2010, the following outfalls flowed: 003A (Pond B), 005A/MON5/005W (all same site - Pond <br />D), 006A (Pond E), and 008A (Pond G). Outfalls 003A and 005A/MON5/005W flowed the third week in September. Outfall <br />008A flowed the second and last week in September. No exceedances were noted. <br />Quarterly Whole Effluent Toxicity (WET) tests were collected for analysis for Outfall 005W during the period. 007W did not <br />flow during the quarter. The test indicated that the effluent was not acutely toxic to Daphnia magna survival (see attached <br />laboratory report). <br />The following certification is provided to verify that that the following the outfalls, did not discharge in June 2010. These <br />included Outfalls 002A (Pond T), 004A (Pond C), 006A (Pond E), and 007A/007W/MON7 (all Pond F) <br />CERTIFICATION <br />I certify under penalty of law that I have personally examined and am familiar with the information submitted herein; and <br />based on my inquiry of those individuals responsible for obtaining the information, I believe the submitted information is <br />true, accurate, and complete. I am aware that there are significant penalties for submitting false information, including the <br />possibility of fine and imprisonment. See 18 U.S.C. § 1001 and 33 U.S.C. § 1319. (Penalties under these statutes may <br />include fines up to $10,000 and/or maximum imprisonment of between 6 months and 5 years.) <br />Brian A. Watterson, Geologist Date <br />Please call me directly: (970) 870-2750 with any questions. <br />Very truly yours, <br />?vt <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company <br />enclosures <br />cc: DBMS; CWPS Permit No. CO-0027154 file