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Preliminary Site Assessment Work Plan ANGELICA TEXTILE 1145 South Sierra Nevada Street, Stockton, California 1.0. INTRODUCTION At the request of Mr. Steve Sanchez of Angelica Textile,Advanced GeoEnvironmental,Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for 1145 South Sierra Nevada Street, Stockton, California(site). The scope of work initially includes the advancement of one soil boring for the collection of soil and grab ground water samples.If hydrocarbon-impacted soil and/or ground water is encountered, additional borings may be advanced as necessary to determine the lateral and vertical extents of impact. The location of the site is illustrated on Figure 1. A plan of the site is illustrated in Figure 2. The investigation was directed by the San Joaquin County Environmental Health Department (SJCEHD)in a letter dated 25 November 2003.This work plan has been prepared in accordance with Central Valley Regional Water Quality Control Board(CVRWQCB)guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is located in a mostly light industrial area of south Stockton, between Wilson Way and Airport Way(Figure 2). Located adjacent to Mormon Slough, the site is situated in an area of low topographic relief at an estimated elevation of approximately 25 feet above sea level(Figure 1).The property is presently occupied by Angelica Textile, an industrial laundry service. 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, 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 alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Advanced GeoEnvironmental,Inc.