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I` -. - <br />"- ~~ ~ • • III IIIIIIIIIIIIIIII <br />SNOWMASS COAL COMPANY <br />P.O. Box 1354 <br />Pelisad4 Coloredo 81528 <br />(303) 484-7951 <br /> <br />May 19, 1986 <br />MAY 2 2 1986 <br />Sandy Squire P. <br />Water Quality Control Division, CJ. of H. ~ '-• - • "' •• ' '• ~ • •• <br />4210 East 11th Avenue <br />Denver, CO 80220 <br />Re: Snowmass Coal Company, Permit #CO-0029599 - Notice of Noncompliance <br />Dear Ms. Squire: <br />In accordance with Part II.A.3 Noncompliance Notification, of our Permit <br />No. CO-0029599, this letter is to notify you in writing of an upset <br />condition discharge from outfall 001. This letter is to follow-up on a <br />phone call to Genny Torrey, May 16, 1986. <br />During an inspection of Snowmass Coal Company's Thompson Creek #1 Mine <br />May 6, measurable inflows were noted coming from old workings in the <br />B-seam. (These inflows caused noncompliant discharge in May, 1985, as <br />noted in a letter addressed to Genny Torrey May 20, 1985.) These <br />initial flows were calculated to be 3t fpm. The decision was made to <br />mix this water with other mine water to be discharged through outfall <br />001. It was hoped that the low flow compared to last year could be <br />diluted adequately for discharge compliance. The mix caused non- <br />compliance in discharge May ~ with a pH of 5.8 and a total iron of <br />13.9 mg/L. A sample May 12 showed a pH of 5.2 and a total iron of <br />195 mg/L. On May 14, the pH was 5.5. Since compliant discharge was <br />not possible, the B-seam inflows were diverted May 14 to an inactive <br />portion of the mine being allowed to flood. This inactive area is <br />estimated to be able to handle the B-seam flow for'tw~ (2) to four (4) <br />weeks. Once the inactive area is full, the flowJwill be diverted to <br />the lower'wash plant sediment pond. We anticipate the flow to quit <br />before filling this sediment pond and discharging through outfall 003. <br />Since diverting the B-seam water into the inactive area, the pH of <br />the 001 discharge increased to 6.9 May 15 and 6.6 May 16. Lab infor- <br />mation is not available yet on samples taken May 14 and 16 to determine <br />total iron. Compliance is expected within a week on total iron dis- <br />charge. <br /> <br />