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Site Assessment Work Plan VANCO TRUCK& AUTO PLAZA 1033 West Charter Way, Stockton, California 1.0. INTRODUCTION 'F r " , r At the request ofMr David Atwatef of Vari De Pol Enterprises,Inc ,Advanced GeoEnvironmental, Inc (AGE) has prepared the enclosed site assessment work plan for 1033 West Charter Way in Stockton, California The work plan includes"the advancement of one paired cone penetrometer testing(CPT) soil boring for the collection of soil and ground water samples and the installation of three ground water wells The location of the site is illustrated on Figure 1 A plan of the site is Illustrated on Figure 2 The EHD required additional site assessment of the vertical and lateral extent of hydrocarbon impacted soil and ground water due to the presence of dissolved petroleum,hydrocarbons beneath site This work plan was prepared at the request of Mr Mike Infurna of the San Joaquin County Environmental Health Department(EHD)in a phone conversation with AGE on 17 May 2004, and was prepared in accordance with California Regional Water Quality Control Board-Central Valley Region (CVRWQCB) guidelines for the investigation of underground storage tank (UST) sites 20. BACKGROUND The site is located at 1033 West Charter Way in Stockton, California, and is situated in an area of mixed commercial and light industrial use The site is 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 a 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 C6ast Ranges to the west,the Klamath Mountains and Cascade Range to the north, and the Sierra Nevada to the east ` 1 The Great Valley has been filled with sediments derived from both marine and continental sources 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 lacustrme, 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 Advanced GeoEnvironmental,Inc y _ r