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Peabody <br />Twentyrnile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />970.879.3800 <br />August 26, 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 />RE: PERMIT CO -0042161: COMPLIANCE ADVISORY RESPONSE SECOND QUARTER 2015 <br />DMR SUBMITTAL <br />Dear Ms. Pickens <br />There was an exceedance for pH during the second quarter of 2015 for Outfall 002A. A value of <br />8.55 was recorded, with the limit being 8.5. This was most likely the result of algae build up in our <br />lower lagoon. Algae growth is known to increase pH in ponds. In reviewing my field notes I see <br />that after this high pH value, all subsequent readings were below the 8.5 threshold through July. <br />There has been no discharge yet during the month of August. Duckweed also builds up during <br />warmer weather, and covered most of the tops of our lagoons. This stops sunlight from <br />penetrating into the lagoon, and algae growth is reduced, thereby resulting in a drop of pH values. <br />I've recently heard of a biodegradable product called Biocide that has been used to control algae <br />growth at golf site ponds, and other public park ponds. We may check into this product and use it <br />in the future. <br />If you have any questions, please contact me directly at (970) 870-2750. <br />Best Regards, <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group, <br />Twentymile Coal Company <br />Enclosures <br />cc: DRMS CWPS Permit No. CO -0042161 file <br />