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Page 15 <br /> 6.4.12 EXHIBIT L - Reclamation Costs <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 19.6% of total <br /> pit volume. Total discharge to maintain dry conditions for reclamation then is: <br /> 14,700,000 gallons/day x 19.6% x 30 days = 86,653,240± gallons <br /> $ 2,252.98 30 days Dewatering Cost for 40± acres <br /> $ 12,352.35 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 4,020-foot wall excavated at 2H:1V and a 2,180-foot wall at 1.25:1V slopes <br /> along the extraction limits flanking WCR 396; and 2H:IV along the South Platte River <br /> levee, as shown on Exhibit D: Extraction Plan, and Exhibit L: Financial Warranty Map. <br /> Actual volume of fill required to grade at 3H:IV for a respective cut slope is determined <br /> in the graphics, below. Square Foot volume of backfill x linear feet of slope divided by <br /> 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 ensure 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 MINING&SAFETY <br /> OFFICE OF MINED LAND RECLAMATION <br />