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EROSION CONTROL <br />The main source of erosion addressed in this report is from surtace run-off. The site will be fairly <br />well protected from both wind and water by the nature of the mining operation since only limited <br />areas will be disturbed at any given time, with reclamation occurring before additional areas are <br />' disturbed. There will be a settling pond capable of holding the 100-year run-off from this site <br />located on the downslope area of the site that will take several hours (12 assuming maximum <br />release rate for the entire duration) to empty providing time for transported sediments to settle <br />out. There is an additional volume (approximately 19,000 ft') of retention provided so that <br />additional settling may occur. The pond will outfall through a 6' PJ rigid pipe that will empty to an <br />area east of the pond protected by rip•rap placed on filter fabric. This water will then flow <br />overland to the Lemon Gulch. To reduce the amount of flows through disturbed areas, a <br />diversion ditch will be constructed along the upslope property line to prevent offsite flows from <br />flowing onsite. This ditch wilt be protected from erosion through the use of hay-bale check dams <br />constructed at a maximum of 50' along the flowline of the ditch. The ends of the ditch will be <br />~ protected by a mat of rip-rap placed on a bed of filter fabric. <br />SUMMARY & CONCLUSIONS <br />The Stevens Lease Clay Mine site will address and minimize the effects of erosion by <br />' -Mining in Phases to reduce the total amount of disturbed area. <br />-Revegetating areas where mining has been completed in coordinated phases. <br />-Draining all disturbed areas to the detention pond. <br />' -Providing check dams along the diversion ditch to limit flow velocities. <br />-Providing rip•rap in areas of concentrated flows. <br />Stormwater management will also be performed on this site affording downstream residents <br />additional flood protection. Therefore this mine site will not offer have any significant negative <br />impacts on downstream or nearby residents do to erosion or stormwater run-off. <br />[ll <br />t <br /> <br /> <br />l _! <br />1 <br /> <br /> <br />