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3.Project Description • Primary crusher • Secondary crusher • Screen decks • Power generator trailer _ • Conveyors • Office trailer • Stacker conveyor Portable office trailers will be placed during the construction phase in the Phase IX area just east of the main entrance. The offices will also serve as a scale house and will be approximately 1,800 square feet in size. Three scales approximately 80 feet long will be placed on concrete foundations. Wheel washers would be placed between the scales and the main entrance to ensure that tracking of dirt onto Koster Road is kept to a minimum. 3.6.2 Mining Operations Phasing Mining would be divided into nine phases beginning with Phase I. While mining Phase I,the — Phase IV area would be temporarily bermed to create a silt pond using Phase I and Phase IV overburden. Once mining is completed in Phase I, it would be used for permanent silt containment and the silt temporarily contained in Phase IV would be pumped into the Phase I silt pond. Mining would continue to Phase II, III,IV, and so on until all phases have been mined. Once mining is completed in the Phase IV area,the pit would be used as a permanent silt pond along with the silt pond in the Phase I area. If additional silt storage is needed during the course — of mining, the Phase V area would be used as a silt pond.Phase IX will he mined once the structures including the aggregate plant are demolished and removed.The material excavated from Phase IX will be processed by a portable plant located on the capped settling pond in the Phase IV area. Tables 3-1 and 3-2 describe the elements of the mine phases. Top Soil and Overburden Removal The total amount of top soil is approximately 800,000 cubic yards,an average of nine inches thick(i.e., 800,000 cubic yards over 659 acres). Topsoil would be stripped using scrapers and stockpiled in berms for use in landscape areas and final reclamation. The largest amount of topsoil stockpiled at one time would be approximately 50,000 cubic yards and will vary as new — areas are opened up and others reclaimed. According to estimates included in Table 3-1,above,the total amount of overburden is — approximately 6.6 million cubic yards. The overburden will be stripped by scrapers and stockpiled in berms, including the landscape berms, prior to use in reclamation.The berms will be located along the perimeter setbacks. — RMC Pacific vemalis Quarry Mining and Reclamation Project 3-18 ESA 1203015 Draft Environmental Impact Report May 2006