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~~ = TerraMatrix <br />~~ ' E ineerin & Environmental Services <br />n9 9 <br />165 S. Union Boulevard • Suite 400 <br />Lakewood, Colorado 80226 <br />303-763.5140•fax 303-763-8003 <br />March 29, 1995 <br />Ms. Janet Binns <br />Department of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />iii iiiiiiiiiiiuiii <br />sss <br />RECEIVED <br />MAR 31 1995 <br />Division of Minerals & Geology <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 documentalion for the items requested <br />by the Division of Minerals and Geology (DMG). The items requested were: <br />1) Manufacturer's specifications for the silt fence, and describe the installation <br />procedures for [he silt fence or straw bales. <br />2) A statement by a P.E. that, in his or her professional judgement, this sediment <br />control system will [real disturbed area runoff so tha[ [he 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 />Accompanying this letter is the manufatturer'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 has been revised to describe the installation procedures for <br />the straw bales. The use of sediment fences to control runoff from disturbed areas is a widely <br />excepted method by both the Stale Highway Department and the construction industry. <br />There is no practical calculation method for verifying [he efficiency of sediment 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 [he suspended solids. To verify the effectiveness of the sedimen[ fences <br />and/or straw bales, EFCI will sample runoff from both sites. Given, however, that the mine <br />site is inactive and [hat 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 cons[raints and may <br />not occur immediately. <br />If sampling indicates that the sediment control systems are not effectively treating the runoff, <br />EFCI will revise and upgrade the drainage control system. Both SAE demonstrations have been <br />revised to include EFCI's commitment to sampling runoff and upgrading the sediment control <br />system if effluent levels are no[ me[. <br />Steamboat Springs, CO • Denver, CO • Seattle, WA • Juneau, AK • Santiago, Chile SA <br />