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<br /> <br />event of wall failure and our default, it would be repair of an inclusion or similar defect that <br />would be relatively simple to repair. <br />We apologize for the error in our exhibit L. We did indeed inadvertently apply the volume of the <br />wall to the surface area cost. <br />With regard to the construction of the interior dike used to support the reconstructed Lupton Bottom <br />Ditch, we offer the following: <br />We agree to separate the two soil horizons where practicable and utilize the A-Horizon soils in <br />topsoiling for revegetation of the dike and the B-Horizon soils for backfill. The two soil types <br />will be segregated and temporarily revegetated with the listed temporary cover seed mix (Table <br />E-3). <br />The two types of material to be used for backfill (overburden and shale) to create the <br />reconstructed Lupton Bottom Ditch alignment will be alternately placed in one-foot lifts by <br />rubber-tired scrapers. The simple action of placing the material in this thickness and <br />compaction with the scrapers while placing the material will ensure mixing of the two material <br />types to achieve compaction and stability. Testing to ensure compaction with little settling of <br />the backfill is discussed below. <br />Maximum lift thickness of the two types of material used for backfill of the reconstructed Lupton <br />Bottom Ditch has been described above. The backfilled material will be tested upon <br />emplacement and compaction utilizing standard engineering practices to confirm that a <br />minimum of 95% standard Proctor dry density compaction rate is achieved. Moisture content <br />wilt be controlled to within 4% of optimum moisture. Additional compaction equipment will be <br />used if necessary. The onsite water truck used for dust suppression at the operation, will be <br />employed to wet the backfill to achieve the proper moisture content, if required. <br />The 24 in. reservoir "cross-drain" pipe will be placed within approximately 3 ft. of compacted <br />backfill that has been excavated back to the top of the shale at the south end of the <br />reconstructed ditch alignment. The pipe will not rest directly on top of the shale, but will rest on <br />and within standard pipe bedding gravel to support and cushion it per the manufacturer's <br />recommendations. Shale and overburden backfill will be placed directly on top of the piping for <br />the last third of the top of the pipe. The transfer pipe will simply be a conduit between the two <br />sides of the reconstructed ditch. A revised Figure B, contained with this response, is enclosed <br />showing the pipe location details. <br />A construction narrative detailing the installation of the reconstructed ditch alignment will be <br />provided with each annual report to the Division during the year(s) that the dike is under <br />construction. <br />We intend to thoroughly mix overburden and weathered shale in compacted lifts at optimum <br />moisture to build the dike. We will employ an independent testing lab to sample and test our <br />soil compaction and to ensure industry standard in-place densities. We will gladly share this <br />information with you, either in our annual report, or when we request partial bond release when <br />the ditch embankment is complete. We agree that the 3:1 slope for the perimeter of the pit and <br />ditch embankment is appropriate for the final use as a reservoir. See attached, Revised Figure <br />A, showing the 3:1 slopes. <br />LM/FL-aUgres2-0418J0 2 of 3 <br />