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3.Project Description 3.6 Proposed Project Components - The Applicant proposes to conduct a phased mining program that would excavate pit run material and convey it to an on-site central processing plant. There will be nine phases, with each phase — mined separately and in a different location on the project site. In addition to mining, Phase IX will include the installation of the processing plants, scales and other facilities. Phase IVA will include the installation of a portable plant site that will be used during the mining of Phase IX. — Mining will begin with Phase I,and once Phase I is completed the extraction would proceed to Phase If and continues in numerical order until Phase IX is mined. Refer to Figure 3-3 and Figure 3-4 for the proposed mining plan (Option 1 and Option 2)and the location of the separate phases. Silt products from the plant would be discharged into silt ponds. All disturbed surface runoff would either be directed to silt ponds or contained within the mining excavation. Reclamation will also follow in the mining order, starting with Phase I. The portable processing plant will be removed from Phase IV once all the material is extracted and processed from Phase IX. — The proposed mining operation would consist of the extraction of 1.7 to 4.0 million tons per year of aggregate materials(sand and gravel)over a 26-to 60-year time period, depending on market _ conditions. Mining would begin approximately one year after San Joaquin County and Stanislaus County approve the project and would initially utilize a portable aggregate processing plant while the stationary plant is constructed. The operation would be open pit,sand and gravel harvesting — and processing. A mining plan was developed based on reviewing over 35 soil borings completed on the Project site. Mining depths would vary from 70 to 120 feet below ground surface, depending on the groundwater level. No mining would occur in the groundwater aquifer. — In addition to the mining operation, the project would include a processing plant, a ready mix concrete plant, an asphalt plant, recrushing/recycling of broken concrete and office facilities. The hours of operation for both excavation and processing would be 24 hours per day, six days per week(Monday through Saturday), with maintenance occurring on Sundays. A paved entrance to the plant and office site would be constructed off Koster Road. A landscaping screen would be developed within a 50-foot setback along Blewett Road and the northern portion of Koster Road, from Blewett Road to the entrance of the mining facility,to — screen operations from the roadways. The entire site would be enclosed with either existing or new fencing. Figure 3-3 and Figure 3-4 depict the locations,features,and phases of the proposed mining operation. 3.6.1 Site Preparation and Construction - Site Clearing and Grading _ Mining would be initiated by first clearing and grubbing the project site of vegetation,trees, structures and debris. The trees and vegetation will be mulched by an outside contractor and used in the on-site landscaping. Excess mulch will be removed from the site. The house and barn — RMC Pacific Vernalis Quarry Mining and Reclamation Project -8 ESA 1203015 Draft Environmental Impact Report May 2006