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iii iiiiiiiuiiiiiii <br />999 <br />STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Depanmenr of Natural Resources <br />1313 Sherman 51., Room 215 <br />Denver, Colorado 80203 <br />Phone: 1303) 866-3567 <br />FA%:13031 8328106 <br />August 15, 1995 <br />~~~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Romer <br />Governor <br />Ms. Kathleen Welt lames E~hhead <br />Mountain Coal Company Eeecueve D~recior <br />P . O . BOX 59 1 Michael B. long <br />Somerset, CO 81434 Divis ion Direc mr <br />RE: Silt Fence Installation information; West Elk Mine; Permit No. <br />C-80-007 <br />Dear Ms. Welt; <br />Pursuant to your request I have located from several publications <br />and manuals, diagrams and instructions regarding the appropriate <br />installation of silt fence. The method for installing the silt <br />fence is fairly standard in the different publications and manuals. <br />Information on installation is probably also available from the <br />manufacturer from which you purchase the silt fence. <br />The anchoring specification, as noted in the enclosed information, <br />is to dig a trench approximately 6 inches deep and place the fabric <br />in the trench and cover with rocks and compacted soil so water can <br />not wash out under the fabric. I am not sure what you are <br />indicating regarding a "pull test" or anchoring strength. The main <br />installation technique according to the manuals is to place the <br />fence in a trench so water can not wash out under the fabric. <br />During field inspections we (myself and Tony), may have pulled on <br />the fence to make sure that it was installed appropriately. We <br />were not measuring the anchoring strength. Pulling on the fence is <br />an alternative to crawling around on our hands and knees. <br />I hope the information I have enclosed will be helpful to you. <br />Please call if you have any questions. <br />Specialist <br />CEJ/007SFIN <br />