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30 November 2000 AGI:-NC Pri�jcct No. 99-065 Page i of 9 �. SITi�_ HYDROGEOLOGIC CONDITIONS The closest surface water feature to the site is the Calaveras River (Divertin- Canal) is located approximately 10.500 feet SoLkthweSt ol'the site. Water from drains into the San Joaquin River Dcep Water Channel and is primarily used for commercial, agricultural and recreational boating, Based upon Well information obtained from nearby sites and data collected from Lines of lYeprul Dcp1h to (;i-oimuhlulcr 1-'0111999 map published by the San Joaquin County Flood Control District and Water Conservation District (FC'1)&rW('D) is currently estimated to occur at a depth ofapproximately 80 feet MOW surface grade (bs(y). 2.4. Rl•.GIONAL GEOLOGIC CONDITIONS Hie site is situated within the Great Valley Geomorphic Pi-cwince of California, a large, elan-ate northwest tending, asymmctric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in agc from .irnra5sic to Recent, creating a nearly flat lvinL, alluvial plaits, which extends from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composino the basement complex of the province have not been completely defined but are believed to he of metamorphic and li'lleous origin. The Great Valley Province has been subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys, The Modesto. Riverbank and Turlock lake Formations and overlying Recent alluvium are the principal sources of domestic ground water in the 13.500-square mile San Joaquin Vallcv Ground Water Basin (Basin 5-22). This basin is drained primarily by the San Joaquin River. 3.0. SCOPE OF WORK Based on the laboratory analysis of soil samples collected and tield observations noted durin11 over-excavation procedures, assessment of petroleum hydrocarbon impacted soil will be required. With consideration of the local extensive use ofground water and high level of MTBE, ground water sampling should be conducted with the initial phase ofsite assessment. Also impacted-grotnsd should be monitored quarterly if discovered duringg, this investigation. Therefore. ground \kater monitorin1, wells will be installed during the first phase Ofthe site assessment. if hvdt'ocarbon--impacted ground water is observed from grab water samples collected. Advanced Geol-An ironmemal.lite.