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G-198256 <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />July 28, 2010 <br />Ms. Tania Watson ?j <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division - Permits and Enforcement Q1?'A'ii0r4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 ot?°' ?d5 <br />Phone: (303) 692-3603 <br />ap;?r <br />RE: PERMIT CO-0027154: JUNE/SECOND QUARTER 2010 DMR SUBMITTAL <br />Dear Ms. Watson: <br />During the month of June 2010, the following outfalls flowed: Outfalls 002A (Pond T), 003A (Pond B), 005A/MON5/005W (all <br />same site - Pond D), and 008A (Pond G). Outfall 002A only flowed the first week of June. Outfall 003A flowed the last three <br />weeks of June. Outfall 005A/MON5/005W flowed each week of the period. Outfall 008A flowed the last week in June. <br />One exceedance was noted for 003A, which was the 7 day max for total suspended solids (TSS) (79 mg/L vs the permit limit <br />of 70 mg/L). This may be the result of sediment disturbance while attempting to gather a sampling. Note that the preceding <br />weekly sample result was 9 mg/L, and subsequent weekly samples results were 22, 29, 20, and 29 mg/L. <br />Although some sites did not flow in June, they did flow during portions of the second quarter of 2010. As these sites have <br />some quarterly reporting parameters, DMRs are enclosed for these outfalls listing the quarterly results, without <br />monthly/weekly entries for June because they did not flow in June. These include Outfalls 006A and 007A/MON7/007W. <br />Quarterly Whole Effluent Toxicity (WET) tests were collected for analysis for Outfalls 005W and 007W during the period. The <br />tests indicated that the effluent were not acutely toxic to Daphnia magna survival (see attached 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 004A (Pond C), 006A (Pond E),and 007A/007W/MON7 (all Pond F) <br />CERTIFICATION <br />l 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 />07 LZ? <br />Brian A. Watterson, Geologist Dat <br />Please call me directly: (970) 870-2750 with any questions. <br />Very truly yours <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