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3.Project Description ,. Hours of Operation The project's hours of operation will be 24 hours per day, 6 days a week(Monday through Saturday)with maintenance on Sundays. However, overnight operations would only occur as needed for special contract jobs requiring nighttime delivery. 3.6.3 Processing Facility The processing facility would consist of conveyors, screens,crushers,and scrubbers.There would be a Ready Mix Concrete Plant and an Asphalt Plant. There would be a quality control facility — located at the plant site. A portable,concrete recycling plant, owned and operated by an outside contractor, would be brought in intermittently into the middle of the plant site to produce base. The office would consist of a series of pre-manufactured buildings. All plant and office facilities would be constructed in the Phase IX area and would be accessed via Koster Road.There would be approximately 40 employees at the facility. The life of the processing operation would _ continue parallel to mining operations. During the final phase of mining,Phase IX, the processing plant area would be mined and a portable processing plant would be set up in the Phase IV area, which by that time would be a capped silt pond. The portable processing plant would remain in — Phase IV for the final phase of mining operations. Truck scales would be located at the processing facility and a scale house/office building that would he approximately 1,800 square feet in size would be located near the truck scales. A portable,concrete recycling plant,owned and operated by an outside vendor, would be brought in intermittently into the middle of the plant site(the Phase IX area) to produce base. Concrete — comeback and waste concrete from the batch plant would be stockpiled for recycling. Approximately 100,000 tons of material per year would be recycled. Stationary Plant The stationary plant will produce between 1.7 and 4.0 million tons of aggregate per year, — depending on market demand. All materials processed through the Vernalis plant will pass through a wet process of scrubbing,coarse and fine material washing,and screening. A certain portion of this washed material will then go through a crushing circuit, then a dry screening — process in order to produce aggregate base and asphalt materials. The production of aggregate base and asphalt products are typically a dry production process. Approximately 75 percent of the processing plant would involve a wet screening process. The wet plant would consist of scrubbers, crushers,coarse material washers,fine material washers, conveyors,and wet screens for the washing and sizing of materials. The other 25 percent of the material would be processed _ through a dry circuit that would consist of conveyors,crushers, and dry screens for the sizing of the crushed aggregates. Input from the processing facility would be approximately 1,400 tons per hour and output would be approximately 1,200 tons per hour(the 200 ton per hour difference would be due to the generation of silts and clays by the processing plant operation). Wastewater from the plant washing process would be stored in settling ponds. Settled water from _ the settling ponds would be recycled for use in the plant washing circuit. RMC Pacific Vernalis Quarry Mining and Reclamation Project 3-22 ESA 1203015 Draft Environmental Impact Report May 2006