2023-02-24_PERMIT FILE - M2022013 (7)

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Page 15 6.4.12 EXHIBIT L - Reclamation Costs Volumes: Total Central Field Volume at Static Water Level = 1,470,040,694± gallons Area of Central Field at Static Water Level = 151.38 surface water acres Central Field average storage = 9,710,931 gal./acre For the initial 5-year excavation: 9,710,931 gal./acre x 40.0± acres 388,437,229± gallons Total Cost for initial 40.0±acres of Discharge = 388,437,229± ±gallons x $ 0.000026/gal. discharge (refer to Kurtz est. utilizing similar pump and rates.) $ 10,099.37-Initial Discharge Cost for 40± acres It is assumed that ongoing dewatering will be required during reclamation of the pit and Raptor has allowed for 30 days once the pit has been dewatered. The estimated inflow rate to the fully excavated pits has been estimated at 15,190,000 gallons/day. The estimate is based on modeling of the groundwater by AWES in support of Exhibit G: Water Information. A memo summarizing the basis of the estimate is attached as a new addendum. The initial 40-acre excavation area represents approximately 19.6% of total extraction area (203.acres). Total discharge to maintain dry conditions for reclamation then is: 15,190,000 gallons/day x 19.6% x 30 days = 89,541681± gallons Cost for 30 working days of Discharge = 89,541,681±gallons x $ 0.000026/gal. discharge (refer to Kurtz est. utilizing similar pump and rates.) $ 2,328.08 30 days Dewatering Cost for 40± acres $ 12,352.35 Total Dewatering Cost for 40± acres Please Note: 2The basins will be lined or otherwise segregated from the area groundwater, in order to liberate the water otherwise retained to supplement loss from evaporation in the unlined state. 2 Adequacy Item 28 VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT MARCH 2O22 A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MINING&SAFETY OFFICE OF MINED LAND RECLAMATION