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June 27, 2012 <br />Ms. Kelly Morgan <br />Colorado Department of Public Health and Environment <br />Water Quality Control Division <br />4300 Cherry Creek Drive South <br />Denver, CO 80222 -1530 <br />Dear Ms. Morgan, <br />5731 State Highway 13 <br />COAL <br />COWMAN <br />r.. <br />�" - aF _ ._ <br />Meekez, Colojacio 81 < 970 -824 -1500 <br />RE: Elevated Levels of Total Suspended Solids ai OutfeII 010A, Colowyo Coal Company L.P. <br />(Colowyo) CDPS Permit No. CO- 0045161. <br />Per the phone message I left you on June 27, 2012, this letter is to inform you in writing of <br />elevated levels of Total Suspended Solids for the month ofJune 2012. Colowyo sampled Outfall <br />010A on June 4, 2012 and laboratory analysis was received on June 12, 2012. The results of the <br />analyses indicated that Outfall 010A exceeded the 35.0 mg /L 30 -Day Maximum Concentration <br />Average for Total Suspended Solids. The Results for Outfall 010A were 48 mg /L for Total <br />Suspended Solids. Settleable Solids limitations were not exceeded at this outfall during this <br />event. <br />The sample was retested to ensure that the first results were correct. The rerun showed results <br />that coincided with the original results. Colowyo sampled Outfall 010A for a second time on <br />June 12, 2012 and laboratory analysis was received on June 20, 2012. The laboratory analysis <br />for the second June sample indicated that Outfall 010A exceeded the 35.0 mg /L 30 -Day <br />Maximum Concentration Average for Total Suspended Solids with results of 46 mg /L. Colowyo <br />sampled Outfall 010A for a third time on June 21, 2012 and laboratory analysis was received on <br />June 26, 2012. The laboratory analysis for the third June sample indicated that Outfall 010A <br />exceeded the 35.0 mg /L 30 -Day Maximum Concentration Average for Total Suspended Solids <br />with results of 46 mg /L. Settleable Solids limitations were not exceeded at this outfall during <br />these events. <br />Colowyo does not believe the elevated levels of Total Suspended Solids are a result of sediment <br />flowing into the pond, but rather the development of algae in the pond due to regional <br />uncharacteristic weather patterns. Colowyo has experienced unseasonably high temperatures <br />during the months of May and June, 2012, while precipitation has also been unseasonably low. <br />East Taylor Pond does receive inflow from a small spring, however flow rates are minimal and <br />