2008-08-11_PERMIT FILE - C1992080

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Carbon Junction Mine Date: Prepared by: Task 024 Puchase filter rock and rock riprap for Carbon Junction channel Filter rock: $13.47 Subtotal X 584 No. of cyds needed for Carbon Junction Channel (page 5 -10 of reclamation plan $7,866 Total cost for filter rock Rock riprap: Purchase price per ton for large riprap in $11.00 Durango area, before hauling and volume discount (from http://candjgravel.com/productpage.htm) X 1.5 Tons per cyd (conversion factor) $16.50 Subtotal + $6.25 Delivery cost per cyd (6.7 cyds per 10 -ton truck, assume $50 per truck -load) $22.75 Subtotal — $5.69 25% volume discount (assumed) $17.06 Subtotal X 4,221 No. of cyds needed for Carbon Junction Channel (page 5 -10 of reclamation plan) $72,016 Total cost for rock riprap 5/22/2008 TK $79,882 GRAND TOTAL COST (ROCK FILTER + ROCK RIPRAP) Purchase price per ton for 3/4" D50 in Durango area, before hauling and volume $7.00 discount (from hftp://candjgravel.com/productpage.htm) X 1.5 Tons per cyd (conversion factor) $10.50 Subtotal Delivery cost per cyd (6.7 cyds per 10 -ton + $7.46 truck. assume $50 per truck -load) $17.96 Subtotal — $4.49 25% volume discount (assumed) $13.47 Subtotal X 584 No. of cyds needed for Carbon Junction Channel (page 5 -10 of reclamation plan $7,866 Total cost for filter rock Rock riprap: Purchase price per ton for large riprap in $11.00 Durango area, before hauling and volume discount (from http://candjgravel.com/productpage.htm) X 1.5 Tons per cyd (conversion factor) $16.50 Subtotal + $6.25 Delivery cost per cyd (6.7 cyds per 10 -ton truck, assume $50 per truck -load) $22.75 Subtotal — $5.69 25% volume discount (assumed) $17.06 Subtotal X 4,221 No. of cyds needed for Carbon Junction Channel (page 5 -10 of reclamation plan) $72,016 Total cost for rock riprap 5/22/2008 TK $79,882 GRAND TOTAL COST (ROCK FILTER + ROCK RIPRAP)