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- -. _ <br />~ ., <br />~ ~'EI~I!9 CZ' C0~~3 L•-8 ! GSL <br />- <br />~` <br />J. F. SATO AND ASSOCIATES ~ seas so. iuvr aT. <br />CONSULTING fNG~NEERS ~ ~ LfTTLETON. COLORADO e0u0 <br />lROJECT MANAGERS i ryANNERi ~ f703) TaT•1200 <br />6 September, 1983 <br />81240 <br />Colorado Department of Health <br />Water Quality Control Division <br />4210 East 11th Avenue <br />Denver, Colorado 80220 <br />Attn: Bob Shukle <br />r <br />Re: MODIFICATION TO NPDES PERMIT N0. CO-0039616 <br />PRYOR MINE. <br />Dear Mr. Shukle, <br />Pryor Mine, located in Huerfano County. was issued NPDES <br />permit no, CO-0039616 for their surface coal mine operation in <br />August 6, 1983. Since that date a further discharge point has <br />needed to be added to the permit. The point is from an existing <br />pond, pond "Z", that had not been identified on the original <br />submittal. <br />The location of the pond with respect to the other points <br />indicated in the permit is shown on the attached drawing. <br />The pond has a volume of 0.30 acre feet and will collect <br />runoff from a previously disturbed area of about 2.1 acres. <br />Runoff will be detained for 24 - 36 hours for storms up to the <br />10-year 24-hr. event. The discharge, less than 0.1 cfs, will be <br />through a 12-inch diameter CMP which will enter the Pryor Canyon <br />Creek. <br />A modification to the original permit is requested. Should <br />you need any further information please contact either myself, <br />~ Steve Lowry at (303) 797-1200 or the Mine Manager, Bill Wilson at <br />(303) 941-4152. <br />I understand that your review will be completed within 180 <br />days, As mining is expected to begin as soon as an exploratory <br />program is completed, your assistance in approving the requested <br />modification is appreciated. <br />Sincerely. <br />Steve Lowry .. <br />cc: Bill Wilson <br />American Fuels <br />