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V •,,` dJ <br />aL V G <br />April 28, 2011 <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />Ms. Kelly Morgan <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; MARCH 2011 and FIRST QUARTER 2011 DMRS <br />Dear Kelly: <br />As discussed in our telephone conversation of April 6, 2011, new quarter specific DMRs will be utilized instead of the <br />combined monthly and quarterly DMRs we had been using. I appreciate your help on that. This should eliminate some of the <br />past confusion when Outfalls do not flow in the reporting month, but have flowed within the quarter. I will be creating electronic <br />versions of your PDFs as soon as I get a chance. <br />In reviewing the new DMRs you emailed me I noted the following: <br />The Frequency of analysis and sample type for flows at all sites should be Weekly, and Instantaneous. When the <br />permit was originally renewed I spoke to Andrew Neuhart about continuous recorders being impractical to maintain in <br />the mountains, so he issued an Amendment allowing us to continue flow measurements as with the earlier permit. <br />MON-5 still has one quarterly parameter, so I'll eliminate that in future electronic DMRs, and create a MON-5Q. <br />During the month of March 2011: Outfall 005A/MON5/005W (all same site - Pond D), E) flowed the last three weeks of March. <br />Outfalls 003A and 008A flowed the last two weeks of March. No other Outfalls flowed in March 2011. During the first quarter <br />of 2011, No other Outfalls other than those listed above flowed. Exceedances were noted with Outfall 005A for the maximum <br />and 30 day average for TSS. During the first week of renewed flow TSS spiked at 124 mg/L, and subsequently dropped to 17 <br />mg/L and then 9 mg/L in the flowing two weeks, respectively. The spike may be related to erosion from a heavy flow of spring <br />melt. In addition, during the same first week of flow there was an unusually high total recoverable concentration (3210 ug/L), <br />which resulted in an exceedance for the 30 day average for the month. This may also be related to an snow melt erosion <br />event. Historically this site has not had problems with iron. No other exceedances were noted. <br />Quarterly Whole Effluent Toxicity (WET) tests were collected for analysis for Outfall 005W during the quarter. 007W did not <br />flow during the quarter. The test indicated that the effluent was not acutely toxic to Daphnia magna survival.