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3 PROJECT DESCRIPTION • Recycle broken concrete and asphalt pavement into base material rather than having this material go to a landfill. 3.5 GEOLOGIC SETTING The project site is located in the southeastern portion of San Joaquin County and the northwestern portion of Stanislaus County, in central California. The region is characterized by the geology of the Great Valley(or Central Valley)geomorphic province, a topographically-dominant northwest-trending valley approximately 50 miles wide and 400 miles long that formed between the Coast Range Mountains to the west and the Sierra Nevada Mountains to the east. The southern portion of the province,called the San Joaquin Valley,contains the San Joaquin River and its many tributaries,including the Merced, Stanislaus,and Tuolumne Rivers. The topography of the Central Valley is relatively flat,with elevations ranging from a few feet to a few hundred feet above mean sea level (msl). The project site ranges from 159 feet above msl in %." its northeast comer to 211 feet above msl in its southwest comer. The topographic gradient is approximately 40 feet per mile(0.5 degrees),decreasing in elevation toward the northeast. The ground surface is relatively level with less than one percent cross slope from southwest to ` northeast, and with no noticeable landforms other than Hospital Creek. 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 H and continues in numerical order until Phase IX is mined.Refer to Figure 3-3 and Figure 3-4 for the proposed mining plan(Haul Route Option 1 and Haul Route 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 approval of 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 RMC Pack Vernalis Quarry Mining and Reclamation Pmjmt 3-7 ESA 1703015 Administretive Draft EIR Match 2004 t.