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<br />M= N R E C, I N C. <br />743 liQ2IZ(Yd OOlA2T, SUITS 205 <br />(3tATID JUNLTIOId, CO 81506 <br />TELEPHONE (303? 245-4101 <br />BLUE RIBBON MINE <br />RECEIVED <br />APR 0 3 1991 <br />Mined Land <br />Reclamation Division <br />April 1, 1991 <br />J. J. Dudash <br />Mined Land Reclamation Division <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Re: Stipulation No. 6 <br />Permit No. C-81-047 <br />Dear Mr. Dudash: <br />Stipulation No.6 to the permit requires Minrec to submit <br />reworked pond sizing calculations, for sediment Pond 005, which <br />reflect the increased drainage area shown by Exhibit H-1. <br />Hnclosed are the calculations required by the stipulation. <br />Pond 005 does receive run-off from an area that is larger than <br />the area for which the pond designed. Fortunately, the reclaimed <br />areas have been established for over four years which allows for <br />the revision of certain run-off curve numbers. The revised curve <br />numbers almost negate the effect of the increase in the size of <br />the drainage area. <br />Please review the enclosed calculations and then give me a <br />call. I would like to discuss with you the necessity of revising <br />the pond for such a small shortage of design storage volume. <br />Please call me if you have any questions. <br />Sincerely, <br />Jim Sto`~E. <br />Chief Engineer <br />Enclosure <br />