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t <br /> A <br /> E N ENVIRONMENTAL S R V I C E S C 0 M,P A N Y <br /> June 28, 2019 <br /> Ms. Aalbers <br /> Colowyo Coal Company <br /> 5731 State Hwy 13 <br /> Meeker, Colorado 81641 <br /> Dear Ms. Aalbers: <br /> Enclosed are the results from chronic biomonitoring tests perfortned for the Colowyo Coal <br /> Company L.P. on effluent from the Colowyo 010A outfall discharge. There were significant <br /> lethal and sublethal toxicity effects to the Cer for aphnia du is test species. The effluent fails <br /> 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 /> L UU�A" <br /> Tessa flunt-Woodland <br /> Laboratory Manager <br /> Enclosure - Invoice <br /> Report <br /> 500 S.Arthur Avenue, Unit 450 * Louisville, CO 80027 303-661,9324 303.661.9325 fax www-seacrestgroup.corn <br />