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Page IS <br /> 6.4.5 EXHIBIT E - Reclamation Plan <br /> Engineer Guidelines for Lining Criteria. Typical to obtaining approval for the <br /> constructed liner, the lined basin must pass a 90-day leak test. Correspondence <br /> from the OSE approving the construction of the lined basin will be submitted to <br /> the OMLR on receipt; or as part of any request for release of the permit, in part or <br /> whole. <br /> Essentially, the pushed parent rock material will form the minimum 3h:1y slopes <br /> of the basin and be compacted to a permeability of 10-1; forming a lined basin that <br /> complies with Colorado Water Law and Guidelines mentioned, above. In this <br /> manner, the lined basins will maintain a required separation and accounting of <br /> stored water from the underlying ground waters. Evidence of compliance with <br /> the rules and regulations of the Colorado Division of Water Resources will be <br /> provided to the OMLR on completion of the lined basins. <br /> Raptor has extensive experience successfully constructing lined storage reservoirs <br /> with several prior projects completed, tested and approved by the OSE. The <br /> deposit contains extensive materials suitable for use in constructing the liner <br /> including claystone, sandstone-claystone-siltstone and sandstone-siltstone <br /> bedrock, clay lenses in the sand and gravel deposit, and overburden often <br /> comprised of low plasticity sandy silty clay to silty sand. The liner will be <br /> progressively constructed once the pit is developed sufficiently to allow regrading <br /> and any problems with the efficacy of the liner can usually be detected prior to <br /> leak testing through evidence of seeps in the constructed liner which can have <br /> remedial action taken. Similarly, although not common, seeps are sometimes <br /> observed in the bedrock floor. While these have generally in Raptor's extensive <br /> experience proved to be self-healing, where needed remedial action and spot <br /> lining and compaction would be undertaken. <br /> ZA Backfill Notice is included with this application as an Addendum at the back of <br /> Exhibit E - Reclamation Plan, to facilitate the fill of portions of the extracted lands <br /> for final end-use potentials beyond water storage, which may include residential, <br /> commercial or industrial structures or uses otherwise approved, now or in the <br /> future, by Weld County, Colorado; or a Colorado municipality, as applicable. The <br /> extent and nature of the water storage basin represents the maximum build-out <br /> respective of optimal extraction of commercial product and resulting final slopes. <br /> As part of reclamation, lands situated above the anticipated final water level of <br /> the completed basins, and within 10.0± feet below the anticipated final water <br /> level of the basins, will be graded to 3H:1V, or flatter. Lands below 10.0± feet <br /> from the anticipated final water level of the basins will also be graded to 3H:1V, <br /> or flatter, unless 2H:1V slopes are otherwise approved by subsequent permit <br /> revision. Naturally occurring or previously established slopes may exceed 2H:1V <br /> where not otherwise affected by extraction activities and may not be altered as <br /> Z Adequacy Item 28: Paragraph removed as proposed post mining land use is lined water storage. <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 />