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Page 14 <br /> 6.4.12 EXHIBIT L - Reclamation Costs <br /> Life of the Operation. Essentially, a 30-year Life of Operations assumes a rate of <br /> extraction of approximately 8.0± acres per year. <br /> The initial Area of Extraction is slightly over 16.0± acres of extraction — or approximately <br /> 2.0±years of operations. The initial length of slope needing graded along the near 800.0± <br /> foot South perimeter will not be required since the Settling Basin Area prevents extraction <br /> from reaching the extraction limits until the settling basin and pump are no longer needed. <br /> Still — an 800-foot segment is a good unit to consider incrementally increasing warranty <br /> along the perimeter 2H:1 V and 1.25:1 V slopes — which may not be encountered until the <br /> 16.0± acres of opening extraction is completed over the first two years of Operations. <br /> So, to better assure the need to backfill such slopes, an initial 800± unit of grading for the <br /> 1.25:1 V cut slope at the WCR 396 perimeter extraction limits is provided for. Additionally, <br /> two 800-foot Units of cut slopes along the South Platte levee (1,600±feet total), will cover <br /> the potential need for the initial 800±feet along the Southern line above the Settling Basin <br /> Area; and an additional 800±feet further east along the South Platte River levee, will also <br /> be included in the initial Warranty estimate to better allow for proactive accumulation of <br /> similar Units to the Warranty over time as extraction moves forward. <br /> To this end, an additional 16± acres—estimating 8.0± acres of additional extraction to the <br /> North and South of the Core may occur, will be included in the dewatering estimate. This <br /> should provide adequate time to adjust the Warranty as Operations advance over the <br /> years in subsequent 8.0± acre units, in either or both directions around or within the Core; <br /> and as Operations eventually open new Sections for extraction. <br /> DEWATERING: <br /> 100 hp. 4,500 gal./min. pump x (up to) 3 pumps @ 24 hours/day <br /> Volumes per Tract: <br /> Total Gallons — Central Field = 2,017,144,043.20± gallons - 168.94 surface water acres = <br /> 11,940,002.6 gal./acre x 8.0± acres = 95,520,021.0± gallons per 8.0± acres. <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 Average Cost per 8.0± acres of Discharge = $ 2,483.52 per 8.0± acres — Unit Cost. <br /> 16.0± acres initial + 16.0± acres subsequent = 32/8 = 4 Units. <br /> $ 2,483.52 per 8.0± acre Unit <br /> X 4 Units <br /> $ 9,934.08 Discharge Cost for 32± acres <br /> VARRA COMPANIES, INC. TWO RIVERS SAND GRAVEL AND RESERVOIR PROJECT NOVEMBER 2021 <br /> A REGULAR IMPACT[1121 CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION MIING&SAFETY <br /> OFFICE OF MINED LAND RECLAMATION <br />