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V Closure Summary Report COLLEGEVILLE MARKET 13521 East Mariposa Road, Stockton, California .r 1.0. INTRODUCTION At the request of Mr. Philip Mathew,Advanced GeoEnvironmental, Inc. (AGE) has prepared this "r Closure Summary Report(CSR) for 13521 East Mariposa Road, Stockton, California(site). Based upon the results of investigations of the dispenser island area at the site, it is AGE's opinion that a site closure is warranted for this facility. The site setting is illustrated on Figure l; the dispenser island location and existing site structure locations are depicted on Figure 2. This CSR has been prepared in accordance with the California Regional Water Quality Control Board(RWQCB)- Central Valley Region guidelines (Tri-Regional Board Staff Recommendations For Preliminary Investigations and Evaluation of Underground Tank Sites) for No Further Action Requests (See Appendix A). 2.0. BACKGROUND The site is located south-east of the City of Stockton, in San Joaquin County, at the intersection of '—' Jack Tone Road and Mariposa Road. Land use of the surrounding properties is agricultural, residential and commercial. The subject site is the location of Collegeville Market,a fueling station and marketplace. The location of the site is illustrated in Figure 1; a plan of the site is illustrated in Figure 2. 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of V 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, 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. 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 Advanced GeoEnvironmental,Inc. V