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rsg & Exrvnottrr~,w se-viees 999 <br />165 S. Union Boulevard • Suite 400 <br />Lakewood, Colorado 80228 <br />303-763.5140 • fax 303-763-6003 <br />~FCEIVED <br />Marrh 29, 1995 APR 0 6 1995 <br />Ms. Janet Binns <br />Division of Minerals & Geology <br />Depanment of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Energy Fuels Mining Company (EFMC) Raton Creek Mine (Permit No. C-82-055), <br />TR-16 Responses <br />Dear Ms. Binns: <br />Accompanying this letter are responses and supporting documentation for the items requested <br />by the Division of Minerals and Geology (DMG). The items requested were: <br />1) Manuhtturer's specifications for the silt fence, and describe the installation <br />procedures for the silt fence or straw bales. <br />2) A statement by a P.E. that, in his or her professional judgement, this sediment <br />control rystem will treat disturbed area runoff so that the effluent is in <br />compliance. <br />3) Energy Fuels commitment to sample the runoff, if possible, from the SAE and <br />test for compliance with sediment limitations. <br />Accompanyingthisletter isthe manufacturer's specification and suggested installation procedures <br />for the silt fence. In addition, the small area exemption (SAE) demonstration for the Clean <br />Water Diversion 1 disturbance area hu been revised to describe the insnllation procedures for <br />the stew bales. The use of sediment fences to control runoff from disturbed areas is a widely <br />excepted method by both the State Highway Department and the construction industry. <br />There is no pnttical calculation method for verifying the effidenry of udiment fences and/or <br />straw bales. Given, however, the small size of the SAES, the sediment fences should effectively <br />trap and retain most of the suspended solids. To verify the effectiveness of the sediment fences <br />and/or straw bales, EFCI will sample runoff from both sites. Given, however, that the mine <br />site is inattive and that there is no mine personnel on site, and sampling must occur during or <br />immediately following a storm event, sampling will be limited by practical constraints and may <br />not otter immediately. <br />If sampling indicates that the sediment control rystems aze not effectively creating the runoff, <br />EFCI will revise and upgrade the drainage control rystem. Both SAE demonstrations have been <br />revised to include EFCPs commitment to sampling runoff and upgrading the sediment control <br />system if effluent levels are not mac. <br />Steamboat Springs. CO • Denver. CO • Seattle. WA • Juneau. AK • Santiago. Chile SA <br />