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I 1 o� I Additional Site Assessment Report - August 2004 VANCO TRUCK& AUTO PLAZA 1033 West Charter Way, Stockton, California - 1.0., INTRODUCTION I ' --At the request of Mr David Atwater of Van De Pol Enterprises,Advanced GeoEnvironmental,Inc -- _ �1 (AGE) has prepared this Additional Site Assessment Report for the property located at 1033 West L ' 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 a Cone Penetration Test investigation, the advancement of three soil borings for soil sampling and monitoring well installation, a ground water monitoring event and preparation of this report The location of the site is illustrated on Figure 1 A plan of the site is illustrated on 1 Figure 2 This report has been prepared in accordance with guidelines issued by the Central Valley Regional ' Water Quality Control Board (CVRWQCB) for subsurface investigations of underground storage tank (UST) systems 1 2.0. BACKGROUND 1• - The site is situated 111 an area of mixed commercial and fight industrial use,bordered by Navy Drive 'I on the north and West Charter Way on the south The prominent features of the subs ect property are depicted on Figure 2 2 1 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 designat6d,the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west;the Klamath Mountains and ' Cascade Range to the north, and the Sierra Nevada to the east' e x 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 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 1 � F Advanced GeoEnvironRtental,Inc , I , i I 1