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iiiiiiiiiiiniiiiu r, <br />~~/~ RECEIVED <br />JUl 2 0 Bil <br />s~ of P~ Seneca Coal Company <br />98 <br />Industrial Permits and Enforcement Program <br />Colorado Department of Health <br />WQCD-PE-B2 <br />4300 Cherry Creek Drive South <br />Denver, CO 80222-1530 <br />Attn. Carla Lenkey <br />RE: WET Test Failure at Discharge Poiat 005, Permit No. CO-0000221 <br />Dear Ms. Lenkey, <br />Per our conversation on July 14, this letter serves to notify the <br />CDOH of the above referenced WET test failure. The attached report <br />for the Ceriodaphnia dubia shows a LC50 of 95.5% (9 out of 20 <br />survivors with 100% effluent). Due to the high conductivity <br />observed during sampling (4500 umho/cm), a second test using <br />Daphnia magna was also performed. That test had a LC50 of >100% <br />(19 out of 20 survivors with 100% effluent). <br />The cause of the failure is likely due to the fact that this <br />sediment pond has been partially filled with mine spoils during <br />this year's spring runoff. This pond is scheduled to cleaned out <br />this summer. In the meantime, Seneca will undergo accelerated <br />testing (using both species) at this discharge point. A second <br />sample was collected on July 14. Please call me at 970-276-5109 if <br />you have any questions. <br />Sincerely, <br />-~1 <br />Dennis Jo es <br />Hydrologist I <br />cc: Mike Boulay (CDMG) <br />Seneca Coal Company ' P.O. Drawer D 'Hayden, Colorado 81639 <br />Telephone (970) 276-3707 FAX (970) 276-3014 <br />