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,''?g a ` »° N, �'.x.<X This Draft Environmental Impact Report (DEIR) has' been prepared pursuant to the California Environmental Quality Act (CEQA) of 1970, as amended. San.Joaquin County is the "lead agency" for the project evaluated in this DEIR and, as such, has the primary responsibility for approving the project. The proposed project is the Koster Road Quarry Excavation Permit application submitted to the County by DSS Engineering Contractors (the project "proponent") on September 3, 1996. The project site is located on the west side of Koster Road, south of Tracy, in the unincorporated area of southern San Joaquin ' p County. If approved as proposed, the project would' P ! d result in the excavation of 29,750,O00 tons of sand and gravel over a 56-year period. Excavation would occur to a depth of 125 feet on 130 acres of a 142-acre site; the remaining area would be used for the proposed aggregate processing facilities. The pit would be reclaimed to a depth of 120 feet. After review of the project proponent's permit application, the County's Environmental Review Officer determined that preparation of an EIR was appropriate in light of potentially significant adverse impacts associated with the approval and operation of the proposed project. Potentially significant environmental impacts of the project that were identified in the Notice of Preparation (NOP) included: Geology and Soils Noise Air Quality Cultural Resources Biological Resources Cumulative Impacts Traffic Aesthetics 14 Since preparation of the NOP, Land Use/Agriculture was identified as an additional .' potentially significant issue that required analysis; Aesthetics was determined not to be a significant issue based on the mitigation measures that the proponent will implement (see "Aesthetics" discussion in Section 3.2) and the visual presence of existing and approved mining operations in the surrounding area. ♦ 7 1.1 BACKGROUND AND NATURE OF PROJECT ' The project site is within an area containing significant aggregate deposits and other quarry excavations in the southwest portion of the San Joaquin County, south of the City of Tracy and northeast of the intersection of Interstates 5 and 580. The site is bounded by Koster Road on the east and is approximately one-half mile south of the intersection of Blewett Road and Koster'Road. The project site is east of, and adjacent to, an existing quarry .r permit operated by Teichert Aggregates. Plans for other quarries to the south and east of the project site are either in the development stage or have existing permits. #. Draft Environmental Impact Report 1-1 ER-96-3