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0 T031 Q I To fid <br />maw <br />3607 County Rd. 65 <br />Rangely, CO 81648 <br />(970)675-4300 <br />fax(970)675-4399 <br />July 25, 2016 <br />Water Quality Protection Section — Industrial Compliance Program <br />Water Quality Control Division <br />Colorado Department of Public Health and Environment <br />WQCD-WQP-B2 <br />4300 Cherry Creek Drive South <br />Denver, CO 80246-1530 <br />RE: Blue Mountain Energy, Inc. — Permit No. CO -0038024 <br />WET testing failure (Daphnia magna and Fathead minnow) <br />Outfall #026 (2nd Quarter) <br />Dear Sir/Madam: <br />As previously reported, WET testing for outfall #026 continued to show toxicity outside of the <br />allowable limit during the quarter. Additional test work was performed by TRI to better define the <br />PTI previously submitted. The main conclusions were that chloride was likely the source of <br />toxicity to P. promelas and D. magna, However, there appears to be some other factor which is <br />decreasing the toxicity for D. magna. Additional test work will be conducted as recommended by <br />TRE to better define the factors influencing the toxicity. The results of the Preliminary Toxicity <br />Investigation (PTI) are enclosed. <br />If you have any questions, please call me at 970-675-4322. <br />Sincerely, <br />Scott Wanstedt <br />Environmental Engineer <br />enc: <br />