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• Preliminary Site Assessment Report VANCO TRUCK& AUTO PLAZA ' 1033 West Charter Way, Stockton, California ' 1.0 INTRODUCTION At the request-of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental, Inc ' (AGE)has prepared the enclosed Preliminary Site Assessment Report for 1033 West Charter Way, Stockton, California (site) The purpose of the Investigation was to assess the lateral and vertical ' extent of petroleum hydrocarbon impacted soil and ground water at the site The scope of work included the establishment of seven soil bonngs, collection and analysis of soil and `grab' ground water samples and preparation of this report The location of the site is illustrated on Figure 1 A plan ' of the site is illustrated on Figure 2 This report has been prepared in accordance with guidelines issued by the Central Valley Regional I Water Quality Control Board (CVRWQCB) for subsurface investigations of underground storage tank (UST) systems u 2.0. BACKGROUND The site is situated in an area of mixed commercial and light industrial use,bordered by Navy Drive on the north and West Charter Way on the south The prominent features on the subject property are depicted in Figure 2 21 REGIONAL GEOLOGIC /HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough, the northern and southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and ICascade Range to the north, and the Siena Nevada to the east The Great Valley has been filled with sediments derived from both marine and continental sources I Thickness of the sedimentary fill ranges from thin veneers along the valley edges to` more than 20,000 feet in the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine in origin and the younger deposits being primarily continental Continental-derived sediments were primarily deposited in lacustrine, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961), the site itself is located on unconsolidated and semi-consolidated ' alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin Advanced GeoEnvi ron mental,Inc II