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DocuSign Envelope ID:6FE5F752-9229-4969-B8B6-9154B88CD3C4 <br /> c% Cr rtGroup <br /> lirri <br /> AN ENVIRONMENTAL SERVICES COMPANY <br /> October 27, 2020 <br /> Angela Aalbers <br /> Colowyo Coal Company <br /> 5731 State Highway 13 <br /> Meeker, CO 81641 <br /> Dear Angela: <br /> Enclosed is the report for chronic biomonitoring tests performed for Colowyo Coal Company on <br /> effluent from the 010A outfall. There was statistically significant toxicity to both test species. <br /> The effluent fails WET (Whole Effluent Toxicity) testing requirements for this sampling period. <br /> If you have any questions or concerns, please do not hesitate to contact me at (303) 661-9324. <br /> Best regards, <br /> Taylor ouillard-Rodak <br /> WET Laboratory Manager <br /> Enclosure(s): Invoice <br /> Report <br /> 500 S. Arthur Avenue, Unit 450 • Louisville, CO 80027 • 303,661.9324 • 303.661.9325 fax • www.seacrestgroup.com <br />