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C/q$o 007 <br />Kaldenbach, Tom <br />From: Kaldenbach, Tom <br />Sent: Monday, March 08, 2010 1:02 PM <br />To: 'savageandsavage@earthlink.net' <br />Subject: West Elk Mine methane drainage well Phase II bond release sedimentology demonstration <br />Mike, <br />one approach to making the Phase II sedimentology demonstration may be as follows. <br />Compare the USLE calculation for a group of MDWs and associated disturbances, to the USLE calculation for a reference <br />area, using the same values in the two USLE calculations for all factors except the Cover-Management Factor (C) factor. <br />Use the reference area that has a vegetation community that is most similar to the group of reclaimed sites, and use <br />reference area data collected in a year having moisture conditions similar to those in the year the reclaimed site data are <br />collected. <br />If an individual site within a bond release group does not appear erosionally stable as indicated by rills, gullies, sediment <br />fans, etc., or if an individual site appears to lack sufficient cover to control erosion, then it would be limited to no more <br />than 60% bond release limit as required by Section 3.03.1(3)(b). <br />Tom Kaldenbach <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Phone (303) 866-3567, ext. 8128