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Preliminary Site Assessment Work Plan <br /> VANCO TRUCK& AUTO PLAZA <br /> 1001 West Charter Way, Stockton, California <br /> 10. INTRODUCTION _ } <br /> At the request of Mr David Atwater,Advanced GeoEnvironmental, Inc (AGE) has prepared this <br /> Preliminary Site Assessment Work Plan for the property located at 1001 West Charter Way, <br /> Stockton, California(the site) The work is being performed to determine the potential existence of <br /> hydrocarbon impacted soil and ground water at the site in the area of the newly upgraded fuel <br /> dispensers and piping The location of the site is illustrated on Figure 1 A plan of the site is <br /> illustrated on Figure 2 <br /> This work plan was prepared as required by the San Joaquin County Environmental Health <br /> Department(EHD)letter dated 04 June 2003, and is ih accordance with Appendix A to Tri-Regional <br /> Recommendations - Reporting, dated 30 August 1991, prepared by the Central Valley Regional <br /> Water Quality Control Board for the investigation of underground storage tank (UST) sites <br /> 2.0. BACKGROUND ` <br /> The site is located at 1001 West Charter Way in Stockton, California, and is situated in an area of <br /> mixed commercial and light industrial use The site is bordered by Navy Drive on the north, and <br /> West Charter Way on the south The prominent features on the subject property are depicted in <br /> Figure 2 <br /> 2 1 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING <br /> The site is situated within the southern portion of the Great Valley Geomorphic Province of <br /> California, a large, elongate, northwest trending, asymmetric structural trough, the northern and <br /> southern portions of the Province have been designated the Sacramento and San Joaquin Valleys, <br /> respectively The Province is bordered,bythe Coast Ranges to the west,the Klamath Mountains and <br /> Cascade Range to the north, and the Sierra Nevada to the east , <br /> The Great Valley has been filled with sediments derived from both marine and continental sources <br /> Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than <br /> 20,000 feet in the south central portion of the valley The sedimentary formations range in age from <br /> Jurassic to Recent,with the older deposits beingpnmanlymarme in origin and the younger deposits <br /> being primarily continental Continental-denved sediments were primarily deposited in lacustrine, <br /> fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the <br /> Advanced GeoEnvironmental,Inc <br /> ti <br /> a i <br />