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.~ ~ - ..-..r_~.~.. ~... . <br />-2 'r... ..~.~.~ <br /> <br />• <br />TRAPPER 1GINING INC. <br />October 30, 1995 <br />FAX DELIVERY. HARD COPY MAILED <br />Mr. Joe Dudash <br />Envirotmental Protection Specialist <br />Colorado Division of Minerals & Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Dear Mr. Dudash: <br />Re: Trapper Mine Permit No. C-81-010 <br />MR-141 Oak Pond No. 2 Outflow <br />F~ <br />~~~ED <br />t: <br />Nl. -I 1995 <br />pN~s,.... , . ~ ,~~, <br />• Noted as a possibility in approved revision TR-67, Trapper has decided to use a synthetic ero- <br />sion control fabric in the outflow for Oak Pond No. 2. We have worked with the manufac- <br />turer to determine a suitable product. <br />The manufacturer's selected product is LANDLOCK ECRM 450. Sheets detailing design <br />parameters and results are provided which are to be included in Appendix Q, Section XIX. <br />The design yields a safety factor slightly greater than one (1) from both a permissible velocity <br />and maximum allowable shear stress approach in both a vegetated and unvegetated condition. <br />Installation will be according to the manufacturer's recommended methods. <br />Please call me or Mark Wehmanen with any questions. <br />Sincerely, <br />/~ <br />/ "/ f <br />~: .. ~ ~ <br />Forrest V. Luke <br />Environmental Manager <br />MWW/jsb <br />t95-OCT30] <br />Encl <br />• c Revisions No~ebook <br />File 109.2.3.4 <br />/'~r 2- l y ~ <br />/jP!•kobcb lo~3r/°S <br />P.O. Box 187 Craiq. Colorado 81626 (3031 824-4401 <br />