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Sedgwick County Road and Bridge Gravel Pit Page 3 <br /> 112(c) Operation Reclamation Permit Amendment August 10, 202 <br /> 4.3 Projected Extraction Rate <br /> 5,000 tons of gravel are expected to be removed each year for 20 years. About 100,000 tons and <br /> 62,000 cubic yards of material will be extracted. <br /> 4.4 Mining Area and Volumes <br /> Years of mining: 2024-2044 <br /> Permit Area: 41.7 acres <br /> Potential Mining Area/Area of disturbed land: 36.0 acres <br /> Volume Extracted: 62,000 cubic yards <br /> 4.5 Stockpile Handling <br /> Figure 3 shows the proposed locations of stockpiles. These locations are approximate in nature <br /> and the specifics of where and what dimensions the stockpiles will have shall be left at the <br /> discretion of the operator. <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 10%. 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 /> Z:IProjectslSedgwick County12023 Gravel Pit Permitting12025 Reclamation Permit Amendment12025 Amendment �� <br /> Exhibits-112c.docx <br />