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Sedgwick County Road and Bridge Gravel Pit Page 2 <br /> 112(c) Operation Reclamation Permit Amendment August 10, 202 <br /> 4.0 EXHIBIT D -Mining Plan <br /> 4.1 Process Description <br /> Mining shall be conducted over 20 years. Mining will be accomplished by first removing 6-12 <br /> inches of topsoil over time that will be stockpiled for reclamation use after excavation has been <br /> completed. Gravel will then be removed with the use of a front-end loader. The expected amount <br /> of material to be mined is 5,000 tons per year for 20 years. <br /> As shown in Figures 3 and 4, mining will start in the southwest corner of the permit area and <br /> generally progress to the northeast. Mining shall be done such that there are no slopes greater than <br /> a 3:1 gradient in the mining area. Approximately 62,000 cubic yards of gravel will be removed. <br /> The specific areas to be mined are left at the discretion of the operator since the specific areas that <br /> have material with favorable characteristics are unknown. Figure 4 depicts an acceptable mining <br /> grade but is only supposed to be approximate in nature as specific areas to be mined and the <br /> dimensions of those areas will be left at the discretion of the operator. Extracted gravel will not <br /> be processed on site. Material that is removed but contains insufficient gravel for use(overburden) <br /> will be stockpiled to be used as backfill after mining activities have ceased. Any additional mining <br /> after the first 20 years will be carried out in the similar manner as described in this mining plan. <br /> After extraction,any backfilling and final grading will be done to control erosion from stormwater <br /> runoff and ensure that there are no slopes greater than 3:1 in the mined area. Backfill will be <br /> compacted so that the ground remains stable. <br /> After any backfilling and grading a 6-12 inch thick topsoil cover will be placed and seeded in <br /> accordance with the reclamation plan. <br /> 4.2 Water Diversions and Impoundments <br /> Four siltation ponds will be built prior to any mining activities in an area. They will be located <br /> downslope of all active mined areas in existing depressions in the ground. Their proposed <br /> locations are shown in Figure 6. The ground will be excavated to the approximate boundaries <br /> shown such that there is sufficient volume to collect the expected rainfall from a 2-year 24 hour <br /> storm, 2.15 inches, see Appendix H for supporting documentation for this claim. <br /> Z:IProjectslSedgwick County12023 Gravel Pit PermittingQ025 Reclamation Permit Amendment12025 Amendment �� <br /> Exhibits-H 2c.docx <br />