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One sediment settling pond or sump will be located within the central processing area to capture <br /> stormwater runoff from the processing area. A second sediment settling pond or sump will be <br /> located at the base of the dump slope to collect stormwater flows from the slope of the dump. <br /> This sump will have the capacity to contain 100 year 24-hour rain events and will be surrounded <br /> by 9 foot tall seeded earthen berms. Therefore, no stormwater or process water will leave the site <br /> and all runoff from a 100 year 24-hour rain event will be trapped on site and waters will infiltrate <br /> the pit floor within 72 hours. Natural drainages from unmined portions of the mesa will be <br /> diverted around the mining and processing areas either through drainage ditch relocations or <br /> construction of isolation berms. Additional calculations for the stormwater/sediment settling <br /> pond is presented in Exhibit G - Water Information. <br /> 4. Topsoil and Overburden Handling <br /> Topsoil ranges from 0 to 12 inches thick on site, 6 inches is the anticipated average. Both topsoil <br /> and overburden are used on site for reclamation of mined out areas. In the event that the <br /> Bradford Mesa Quarry needs to store topsoil, overburden, or waste fines in a berm, material piles <br /> will be either within the foot print of the current pit or along the western perimeter of the site. <br /> Topsoil stockpiles will be constructed to 2H:1 V slopes and overburden piles will have 21-1:1 V <br /> slopes. To prevent erosion of stockpiles, within 180 days of establishment piles will be seeded <br /> with clover. <br /> Anticipated topsoil to be removed and stockpiled in undisturbed future mining areas amounts to <br /> 360,040 CY and is equal to the amount required during reclamation of all disturbed areas with a <br /> topsoil application of 6 inches. Anticipated overburden in all unmined areas to be removed and <br /> stockpiled totals to 4,320,470 CY and is equal to double the required volume of 2,160,240 CY <br /> needed for reclamation of all disturbed areas with a replaced overburden depth of 3 feet. These <br /> are estimates based on the NRCS soils report, average known topsoil and overburden depths, and <br /> the previous permit's boring results. <br /> 5. Schedule of Operations <br /> Mining operations will occur Monday through Saturday during daylight hours and intermittently <br /> during the life of the operation. Mining, screening and processing will be conducted with <br /> portable equipment at various times of the year. Product will be sold throughout the year.Night <br /> Bradford Mesa Quarry X rck,x "i and.Asxoefa M PLL <br /> August 2019 D-13 <br />