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Page 13 <br /> 6.4.12 EXHIBIT L — Reclamation Costs <br /> Dewatering Estimate (refer to Two Rivers estimate utilizing similar pump and rates): <br /> Initial pit dewatering: <br /> 518,901,425 gal x $ 0.000131/gal. discharge cost = $67,976.09 <br /> Construction dewatering (one month): <br /> 131,760,000 gal x $ 0.0001/gal. discharge cost = $13,176.00 <br /> NOTE: Sufficient water resources exist to supplement basin losses in its unlined <br /> state during operations. However, concurrent reclamation, which includes the <br /> progressive lining of basin walls once extraction is complete, is ongoing, and the <br /> final planned use of the pit is a developed water resource in the form of a lined <br /> reservoir. <br /> GRADING: <br /> As stated in Exhibit D - Extraction Plan: <br /> Extraction, which occurs within the basin at a 1.25H:1V slope, is expected <br /> to be complete within 5 to 7 years. Following extraction, slopes will be <br /> regraded at a 3H:1 V slope. Currently, the entirety of the western wall, or <br /> 1760± linear feet, has been extracted and regraded. When fully <br /> extracted, there would be an estimated 9,357± linear feet remaining <br /> of wall perimeter that would need to be reclaimed in a worst-case <br /> scenario. An estimate of the remaining volume to be regraded is provided <br /> by subtracting the volume of the finished, regraded basin (3,951,674± CY) <br /> from the current basin configuration (4,098,487± CY)for a total volume to <br /> be regraded of 146,813± CY. <br /> Average push distance is 50± feet using equipment and assumptions leading to per unit <br /> cost previously determined by OMLR (refer to Two Rivers estimates at back of this <br /> exhibit) = $1.406 per LCY. <br /> 146,813± LCY <br /> x $ 1 .406 per LCY. <br /> $ 206.419.12+ to grade remaining ungraded slopes <br /> Liner Installation: <br /> RAPTOR MATERIALS, LLC. PARCEL 122- RESOURCE DEVELOPMENT PROJECT APRIL 2024 <br /> A REGULAR IMPACT[112]CONSTRUCTION PERMIT APPLICATION-COLORADO DIVISION OF RECLAMATION, MINING&SAFETY <br /> TECHNICAL REVISION 03 <br />