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Lining of basins involves the placement of low permeability- compactable fill, from <br /> on-site or other suitably sourced geologic materials, into the keyway; the same <br /> keyway used to facilitate discharge to keep the basins dry and free of <br /> groundwaters at the time of extraction. The balance of the basin floors and <br /> slopes are also covered and compacted ulth the same materials until it meets the <br /> standards established under the August 1999 State Engineer Guidelines for Lining <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 WING&SAFETY <br /> OFFICE OF MINED LAND RECLAMATION <br /> Page 15 <br /> 6.4.5 EXHIBIT E - Reclamation Plan <br /> Criteria. Typical to obtaining approval for the constructed liner, the lined basin <br /> must pass a 90-day leak test. Correspondence from the OSE approving the <br /> construction of the lined basin will be submitted to the OMLR on receipt; or as <br /> part of any request for release of the permit, in part or whole. <br /> Essentially, the pushed parent rock material will form the minimum 3h:1x- slopes <br /> of the basin and be compacted to a permeability of 10-6; forming a lined basin that <br /> complies with Colorado Water Law and Guidelines mentioned, abo-ve. In this <br /> manner, the lined basins i ill maintain a required separation and accounting of <br /> stored water from the underlying ground waters. E\idence of compliance with <br /> the rules and regulations of the Colorado DiNision of Water Resources will be <br /> prodded to the 0MLR on completion of the lined basins. <br /> Division Second Adequacy Comment <br /> RAJ must update Exhibit E to remove ambiguity in the plan in general, and in <br /> particular in comparison to the application form. <br /> Raptor Materials Second Adequacy Response <br /> The application has been revised as requested with wording revised or removed <br /> completely in various revised Exhibits to remove ambiguity and provide clarity that <br /> the reclamation plan and proposed post mining land use is lined water storage. <br /> 361Page <br /> Correspondence to the Colorado Office of Mined Land Reclamation—Reply to Rob Zuber,EPS—Adequacy Letters of 24 Tune and 5 <br /> August 2022; in the matter of the Two Rivers Sand,Gravel and Reservoir Project—M2022-013. <br />