2011-03-03_REVISION - C1981028 (3)

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inspections have revealed concerns with protection of the hydrologic balance, protection measures have been implemented and maintained. Notice to Parties Identified in Rule 3.03.2(1): Please see attached copies of letters and certified receipts sent to specified parties. A copy of the letter to the Weld County Clerk and Recorder and the Town of Keenesburg, requesting retention of a public copy of the bond release application are enclosed in this section. Newspaper Advertisement: A copy of the newspaper advertisement to be published in the Fort Lupton Press is attached. A copy of the proof of publication will be forwarded for inclusion when received. Achievement of Revegetation Success The reports, 2009 Quantitative Vegetation Study, Areas 2, 5, 6, 7, 9, 10, 15, 16, and 19, Coors Energy Company Keenesburg Mine, KeenesburColorado, and 2010 Quantitative Vegetation Studv. Areas 2. 5. 6. 7. 9. 10. 15. 16, and 19. Coors Energv Comnanv Keenesburg Mine, Keenesburg, Colorado that document achievement of the applicable final revegetation bond release criteria are appended to this application. A summary of the applicable revegetation success criteria and sampled values for 2009 and 2010 for the Keenesburg Mine follows. . Vegetation Cover The revegetation success criterion for vegetation cover for the Keenesburg Mine is a predictive equation based on cumulative precipitation amounts during the period from September-July. The predictive equation for total vegetation cover is y=0.0173x3- 0.8592x2+14.562x-47.015, where x is the cumulative amount of precipitation and y is the total percentage of live vegetation cover. The vegetation cover success criterion value for 2009 was calculated to be 35.69% total vegetation cover (based on 13.71" precipitation value). Total Vegetation Cover (2009) 1998/1999/2000 Rec. Areas Xbar 60.96% S 7.41 N 46 Nmin 3 Coors Energy Company Keenesburg Mine Page 3 Phase III Bond Release: Areas 2, 5, 6, 7, 9, 10, 15, 16, 19