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Savage and Savage Environmental <br />practical solutions for environmental issues <br />4610 Haystack Drive <br />Windsor, Colorado 80550 <br />970 674 8080 telephone <br />970 674 8088 facsimile <br />savageandsavage@earthlink.net <br />June 24, 2010 <br />Rob Zuber, Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining & Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Re: Phase II Bond Release (SL-05), Keenesburg Mine (CDRMS file C-1981-028) <br />Response to June 16, 2010 CDRMS correspondence <br />Dear Rob: <br />In response to your question regarding Table 3 from the vegetation report, 2009 <br />Vegetation Monitoring, Areas 23, 25, and 30, Coors Energy Coinpany Keenesburg Mine, <br />Keenesburg, Colorado submitted in support of the SL05 bond release application, the <br />table represents quantitative vegetation cover data collected in 2009 from Area 30 <br />(seeded in 2006). The original data and tables were reviewed to verify this. A revised <br />Table 3 is appended as requested. <br />With regard to the Sedimentology Evaluation, the native area A-A' transect was removed <br />from the analysis as requested. The LS (length slope factor) was recalculated for each of <br />the remaining native slopes employed in the analysis and the appended table revised to <br />reflect the calculated LS values. It should be noted that Table 3, Values of the <br />topographic factor, LS, for specific combinations of slope length and steepness from <br />Technical Release 51 does not provide LS factor values for slope lengths over 1,000 feet. <br />In our case, where the native slope lengths were 2,000 feet in length, the footnoted <br />equation from Table 3 (LS= (k/72.6)' (65.41 sine O +4.56 sin O +0.065) was employed <br />to calculate the LS factor. <br />The results of the revised calculations for sediment yield from the native areas revealed <br />that the reclamation areas generate less sediment than the native areas, satisfying this <br />requirement for Phase II bond release.