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III IIIIIIIIIIIII III 999 The Pittsburg & Midway Coal Mining Co. A Chevron Company Edna Mine P.O. Box 176, Oak Creek, CO 80467 (970)736-8111 Colorado Department of Health WQCD-PE-B2 4300 Cherry Creek Drive South Denver, CO 80222-1530 Dear Sir/Madam: RFCFIVF_f? NOV 2 2 1995 Division of mine~ovem~0e0r4Y21, 1995 This letter will serve as follow up, and conclusion, to an incident of toxicity reported from site DMR 002 at the Edna Mine site. The site failure to the fathead minnow species was reported as a result of the third quarter WET testing process. This failure was reported to the Colorado Department of Health within the 21 day reporting threshold required. The site ceased discharging soon after the quarterly test cycle and with the consent of the CDH accelerated testing was delayed until the site began discharging again. This settling pond began discharging during the second week of October and so the regular third quarter WET tests, again with the consent of the CDH, were reported and considered to be the first of the accelerated tests at this site. The samples for this first accelerated test were collected on October 16, 18 and 20. Site 002 passed the test criteria for both species during this test cycle. The second accelerated test samples were collected on October 23, 25 and 27. The results for this test also passed the criteria set forth in the Edna Mine Permit (#CO-0032638). This test marks the second test in a row passing the test criteria, and thus this incident of toxicity is considered ended. A copy of the test results for this second accelerated test are attached. The first set of test results was forwarded to your office with the fourth quarter test results on November 8, 1995. Should you have any questions regarding this matter, please contact me at the Edna Mine site. Sincerely, David Beverlin Resident Engineer cc: U.S.E.P.A. CDMG Mine File