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1 a 1 • Preliminary Site Assessment Report Former BUFFALO TANK CORPORATION 5709 East Fremont Street, Stockton, California 1 1.0. INTRODUCTION At the request of Mr. Bill Miranda, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Preliminary Site Assessment Report (PSA) for 5709 East Fremont Street, Stockton, California (the site). The objective of the investigation was to determine the vertical extent of hydrocarbon-impacted soil; the scope of work included the advancement of one soil probe boring. The site and the surrounding area are illustrated in Figure 1. On-site structures and soil boring locations are illustrated on Figure 2. ' The work was performed in accordance with San Joaquin County Environmental Health Department (EHD) and California Regional Water Quality Control Board (CRWQCB) guidelines for investigation of underground storage tank (UST) sites. Soil boring advancement and sampling procedures were outlined in the AGE-prepared Preliminary Site Assessment Work Plan, dated 06 January 2003 and approved by the EHD by letter dated 31 January 2003. �• 2.0. BACKGROUND The site is located in a rural/commercial area of unincorporated San Joaquin County, east of Stockton(Figure 2).Located on State Highway 26(East Fremont Street),east of Beyer Lane,the site is situated in an area of low topographic relief at an estimated elevation of approximately 35 feet above sea level (Figure 1). The property is currently vacant. 1 2.1. REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING 1 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 1 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 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 1 alluvium,lake,playa and terrace deposits of Quaternary age(Jennings, 1977).Rocks composing the Advanced GeoEnvironmental,Inc.