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Phase II Site Assessment Report RISHWAIN PROPERTY 48 North Wilson Way, Stockton, California 1.0. INTRODUCTION At the request of Mr. Joseph Rishwain,Advanced GeoEnvironmental,Inc. (AGE)has prepared the enclosed Phase II Site Assessment Report for the property at 48 North Wilson Way, in Stockton, California. The purpose of the investigation was to test for the presence or absence of suspected contaminants in an area identified as a potential concern in a previous Phase I Environmental Assessment.The concern was associated with a former underground storage tank(UST),associated dispenser, and piping that was located on the subject property. The Central Valley Regional Water Quality Control Board requirements for the investigation of underground storage tank(UST) sites was used as guidelines for the investigation. The location of the site and its surroundings are illustrated in Figure 1. Major features on the site and boring locations are illustrated in Figure 2. 2.0. BACKGROUND The subject property is located in the central portion of the City of Stockton, at the southeast corner of North Wilson Way and Weber Avenue.The surrounding areas consist of mixed commercial and light industrial businesses. Features on the property include areas of grass, a narrow asphalt driveway,and concrete foundations from former structures.The Southern Pacific Railroad right-of- way is adjacent to the subject property along the northern boundary. 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 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 r+ Advanced GeoEnvironmental,Inc.