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COLORADO <br /> a Division of Reclamation, <br /> Mining and Safety <br /> Department of Natural Resources <br /> General Assumptions: <br /> • Inflationary updates only accounted for on Surface Reclamation-worst case scenario of <br /> approved mine plan <br /> • Whirlwind Bulkhead cost from original estimate $111,450 <br /> • No Packrat contingency bulkhead since only surface was affected to date <br /> • Subsurface updates will occur after safety rehab work BUT prior to additional <br /> developments. <br /> o Will require 3 bids from independent contractors for the scope of work outlined <br /> under the Division's Memo: Cost Estimate for Water Impounding Concrete <br /> Bulkheads dates Nov. 14, 2007 <br /> Miscellaneous: <br /> • Reveg applications between sites are inconsistent. If a tractor is being mobilized to disk a <br /> site then the ground should also be drill seeded and mulched powermulched/crimped. <br /> Similarly if site can be prowemulched,it should also be drill seeded and mulch crimped into <br /> place. I.e. reveg applications should be all hand or all tractor not a blend of the two. Consider <br /> changing on future estimates <br /> • Several user provided estimates used due to system limitations and cost being unavailable <br /> (obsolete). Need realistic updated cost that accounts for inflation in the future. <br /> Below is a table which summarizes the input changes made from the Initial Reclamation Liability <br /> Estimate Feb 6, 2008. This table does not account for inflation or unit cost changes. Corresponding <br /> changes are also highlighted on the bond calculation. <br /> Task Form Used Description <br /> BH1 N/A No Change-Used original figure,no inflationary increase <br /> 01P Demo Load Out Bins- No cost for demo/haul to dump/disposal. Manually <br /> put in each item <br /> 02P Mineseal No changes <br /> 03P Dozer Originally 16.5% changed to closest 15% <br /> 04P Excavate No Changes <br /> 05P Excavate No Changes <br /> op co <br /> mow, <br /> Physical: 1313 Sherman Street, Room 215, Denver, CO 80203 P 303.866.3567 F 303.832.8106 I �¢ <br /> Mailing: DRMS Room 215, 1001 E 62nd Ave, Denver, CO 80216 https://drms.co[orado.gov <br /> Jared S. Polis, Governor I Dan Gibbs, Executive Director I Virginia Brannon, Director <br /> *1-76 4L <br />