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Thy f~oCr~it Group <br />An Environmental Services Company <br />August 7, 1998 <br />Mr. Dennis Jones <br />Peabody Coal -Seneca Mine <br />Drawer D <br />Hayden, Colorado 81639 <br />Dear Dennis: <br />I am pleased to enclose the report for the Partial Toxicity Investigation (PTI) performed with the <br />Gas Research Institute Freshwater Salinity Toxicity Relationships model. The model shows that <br />the Ceriodaphnia would be affected by the levels of dissolved solids found in the 005 discharge. <br />The model also shows that the Daphnia magna would not be as affected by these levels of TDS. <br />Since the CDPHE suggested using the STR model for TDS determination, there should be no <br />problem with the state approving the substitution of Daphnia magna for the Ceriodaphnia in the <br />acute WET testing for your 005 discharge. <br />Please feel free to call me if you have any questions. <br />Sincerely, <br />~-\~ <br />Kelt r A. Can- <br />Laboratory Manager <br />enclosures: Report, Invoice <br />325 Interlocken Parkway, Suite 205 Broomfield. Colorado 80021 • (303) 438-0970 • Fax: (303) 438-0971 <br />