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The San Joaquin County Development Title §9-1415.3(a) defines permitted accessory uses under any Quarry Excavation Permit approved Under its provision by the following: Quarry excavations may include the.use of equipment, structures, and facilities necessary or convenient for the extraction, processing, storage, and transport of materials, including, but not limited to: (1) Separation plants; (2) Rock crushers; (3) Concrete batching plants; (4) Asphalt batching plants. According proposed cordin to the Reclamation Plan for Koster Road Quarry included in the permit application, the quarry would be used to supply the construction aggregate needs of DSS Engineering Contractors and local customers. Most of the raw material would be excavated and hauled during the summer and fall .months using a single shift, or a double shift on rare occasions. Each phase would be mined and the previous phase reclaimed in a continuous operation. An aggregate processing plant would operate on a single shift basis for about 200 days per year. In times of very high demand, the processing plant may operate a second shift. An asphalt concrete plant located on the project site would operate approximately 150 days per year on a single shift basis. On special occasions, night paving may be required by Caltrans or other local agencies, during which the processing plant would operate during "off hours." 1.2 PURPOSE AND SCOPE OF EIR As provided for in the State CEQA Guidelines, public agencies are charged with the duty of avoiding or minimizing environmental damage where feasible. In fulfilling this duty, a public agency has an obligation to balance a variety of public objectives, including economic, environmental, and social (Section 15021, State CEQA Guidelines). This EIR is an informational document, the purpose of which is to inform public agency decision-makers and the general public of the significant environmental effects of the proposed project. Additionally, the EIR identifies possible means to minimize the significant effects and describes reasonable alternatives to the project. (The proposed project and alternatives have been subjected to equivalent levels of analysis, and an environmentally superior alternative has been designated, as required by CEQA, and is described in Chapter 5.) f The purpose of this DEIR is to: 1) identify the potential significant effects on the J� environment resulting from the implementation of the quarry excavation and to indicate the manner in which those significant effects can be mitigated or avoided wherever feasible; and 2) to identify any unavoidable adverse impacts that cannot be mitigated. As required 4 by CEQA, the County must consider the information in this EIR and previous environmental Draft Environmental Impact Report 1-2 ER-96-3