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Sedgwick County Road and Bridge Gravel Pit Page 4 <br /> 112(c) Operation Reclamation Permit February 25, 2024 <br /> Phase 3: <br /> Description: Removal of the top of dune south of first 2 dunes dune that progresses <br /> downward and outward to contour outlined in red in Figure 5. <br /> Area: 1.78 acres <br /> Location: <br /> Top of Dune: Lat: 40.948458° Long: -102.238900° <br /> Volume Extracted: 35,636 cubic yards <br /> Depth of Extraction from top of dune: 26 feet <br /> 4.5 Stockpile Handling <br /> Figure 3 shows the proposed locations of stockpiles. <br /> Topsoil <br /> Each mining phase will consist of the following, 6-12 inches of topsoil removed and stockpiled <br /> for reclamation use. Woody vegetation will be removed from topsoil prior to stockpiling. <br /> Stockpiles of topsoil will be located away from mining areas so that they are not disturbed prior to <br /> reclamation activities as shown on Figure 3. Stockpiles of topsoil shall not be more than 2 feet in <br /> height to allow enough air exposure to maintain soil quality. Stockpiles of topsoil shall not be <br /> compacted. Individual stockpiles of topsoil will be stabilized against erosion.Erosion stabilization <br /> of topsoil stockpiles shall be done using temporary seeding, the seed and seeding rate to be used <br /> depending on time of year is shown in Table 1 below. <br /> Overburden <br /> The 1993 Geotechnical report from empire laboratories indicates that there is a clay stratum that <br /> is approximately 3 feet thick. This clay will be stockpiled as overburden material and backfilled <br /> after mining operations have ceased. The amount of overburden material to be removed is <br /> estimated to be 15%. Overburden stockpiles will be located away from mining areas as indicated <br /> in Figure 3. Stockpiles of overburden shall be approximately 10 feet in height and the approximate <br /> lateral dimensions are shown in Figure 3. Erosion stabilization of overburden stockpiles shall be <br /> done using temporary seeding, the seed and seeding rate to be used depending on time of year is <br /> shown in Table 1 below. <br /> Z:I P%/eclslSedgwrck County12023 Gravel Pa Permatingl Permit AEC <br />