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iii iiiiiiiiiiiuiii <br />999 <br />DIVISION OF MINERALS AND GEOLOGY <br />Depunmenl o(NUmml Resources <br />I I I } Sherman 51., Room 21 i <br />Den. er, Colorado 80201 <br />Vhone. 1 ;0 it N66-JSfii <br />F:\X: 17071 K f!-81 U6 <br />October 21, 1993 <br />Mr. Kazl C. Koehler <br />Senior Environmental Engineer <br />Trapper Mining Inc. <br />P.O. Box 137 <br />Craig, Colorado 31626 <br />Re: Trapper Mining Inc., Permit No. C-81-010 <br />SL-Ol, Phase II Bond Release <br />Deaz Mr. Koehler: <br />I~~ <br />DEPART[viENT OF <br />NATURAL <br />RESOURCES <br />Rov Romer <br />Governor <br />dames 5. Lochhead <br />Eyeculive Director <br />michael 8. I onl; <br />Drvumn Direuor <br />The Division has the following comments regazding Trapper's above-referenced bond release <br />submittal. <br />"Contour" treatment/practice. In selecting a CN from Figure S-4, Trapper considered all <br />of its reclaimed blocks to have been "contoured", which is a tillage practice. Page 4-256 of <br />the permit document explains that Trapper had planned in its reclamation work to possibly <br />use contour furrows, small depressions, etc. for erosion control, but there has been no <br />subsequent documentation that those practices actually occurred. What is Trapper's basis for <br />considering all of its bond released blocks as contoured ? <br />Coyote Pond sediment survey. In order to compaze pre-mining and post-mining TSS <br />yields, the Division is using sediment survey data for calculating the historical sedimentation <br />rate in Trapper's ponds which receive runoff from the bond release parcels. We have <br />adequate data for all ponds except Coyote Pond. Please provide us a copy of the data from <br />your most recent sediment survey of Coyote Pond. <br />If you have any questions, please call me. <br />Sincerely, <br />~uva~ ~.~ <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />STATE OF COLORADO <br />cc: David Berry. CDMG <br />