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Page 15 <br /> 6.4.12 EXHIBIT L - Reclamation Costs <br /> Total Gallons — Central Field = 2,017,144,043.20± gallons 168.94 surface water acres <br /> = 11,940,002.6 gal./acre x 40.0± acres = 477,600,105± gallons for the initial 5-year <br /> excavation. <br /> Y_ = Avg. = 95,520,021.0 gal./8.0 acres x $ 0.000026/gal. discharge (refer to Kurtz est. <br /> utilizing similar pump and rates.) <br /> Total Cost for initial 40.0± acres of Discharge = 477,600,105± gallons x $ 0.000026/gal. <br /> discharge (refer to Kurtz est. utilizing similar pump and rates.) <br /> $ 12,417.60 Initial Discharge Cost for 40± acres <br /> It is assumed that ongoing dewatering will be required during reclamation of the pit and <br /> Raptor has allowed for 30 days once the pit has been dewatered. <br /> The estimated inflow rate to the fully excavated pits has been estimated at 14,700,000 <br /> gallons/day. The initial 40-acre excavation area represents approximately 17% of total pit <br /> volume. Total discharge to maintain dry conditions for reclamation then is: <br /> 14,700,000 gallons/day x 17.1% x 30 days = 75,365,291± gallons <br /> $ 1,959.50 30 days Dewatering Cost for 40± acres <br /> $ 14,377.10 Total Dewatering Cost for 40± acres <br /> Please Note: 2The basins will be lined or otherwise segregated from the area <br /> groundwater, in order to liberate the water otherwise retained to supplement loss from <br /> evaporation in the unlined state. <br /> GRADING: <br /> As stated above, Raptor conservatively estimates for Financial Warranty purposes an <br /> approximately 50:50 split of wall excavated at 2H:1V and 1.25:1V slopes along the <br /> extraction limits flanking WCR 396; and 2H:1V along the South Platte River levee, as <br /> shown on Exhibit D: Extraction Plan, and Exhibit L: Financial Warranty Map. <br /> Actual volume of fill required to grade at 3H:1V for a respective cut slope is determined <br /> in the graphics, below. Square Foot volume of backfill x 2,555 linear feet of slope divided <br /> by 27 will yield the required cubic yards needed for each section of highwall. A rate per <br /> Loose Cubic Yard of fill taken from the previously approved values determined by the <br /> OMLR, is used to better insure the integrity of the resulting values. <br /> 2 Adequacy Item 28 <br /> VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 <br /> A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MIING&SAFETY <br /> OFFICE OF MINED LAND RECLAMATION <br />