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MINING PLAN EI~~IT C <br />1. General Plan <br />The property boundary has been surveyed on site and the permit area will be surveyed prior to any <br />site disturbance. Map E-1 shows the mining plan and river crossing details. <br />Prior to any mining operations, the sediment control system will be installed, which consists of a 10 <br />feet high berm made of topsoil on the north side of the property, which is meant to isolate nmoff <br />water on and off the site. A 2 feet high topsoil berm will be placed on the other sides of the permit <br />area for the same purpose. The berms will also contain the runoff from the 100 year - 24 hour event <br />within the permit area. If a 100 year flood occurs, the berms should isolate the permit area from the <br />rest of the floodplain, even though the majority of the permit area is within the 100 year floodplain. <br />The berms also serve the purpose of temporarily storing the topsoil from the mine pit and facilities <br />areas. All sideslopes for the temporary piles will be maximum 3.OH1.OV. Once mining is termi- <br />nated, these piles will be graded back into the lake to help create shelf wetlands. Also, prior to min- <br />ing, the overhead cable television line will be moved to immediately west of the permit area. See <br />letter from cable company in Exhibit L. <br />As shown on Map E-1, the plan of operation is to initially strip the topsoil from the mining area and <br />stockpile it, which is approximately 8.07 acres. This material is expected to average 0.25 feet in <br />thickness, therefore the volume to be moved is 3255 cubic yards. The topsoil stockpile (berm) area <br />allocated at the northern end of the permit area as shown on the map. The topsoil stockpile will have <br />an average height of 5 feet and will be seeded immediately with the seed mix described in the recla- <br />mation plan. No slopes of the stockpile will exceed 3.OH:l.OV. The pile shown on Map E-1 at an <br />average height of 5 feet and a length of 439 feet will hold 3255 cubic yards, therefore, the pile area is <br />adequate. <br />A Cat D-8 or D-9 dozer is expected to perform the stripping and stockpiling. Scrapers could also be <br />used. <br />Once this work is completed, the excavation of gravel will begin to allow dewatering of the pit. <br />This excavation will begin on the north and west portions of the pit area, where little overburden <br />occurs. Therefore, no overburden stockpile is needed. This area is called Phase 1. A D-8 or D-9 <br />dozer and/or Cat type 988 loader will be used to push or carry the gravel to the pit facilities. It is <br />possible that other equipment may also be used in the material excavation. Map E-1 shows two <br />cross-section lines: A-A' and B-B', which are shown on Map E-3 Cross Sections. These cross-sec- <br />North Fork Pit Mazch 04 14 <br />