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V Preliminary Site Assessment Report May 1997 Grewal's Market 4100 East Fremont Street, Stockton, California 1.0. INTRODUCTION In accordance with the request of Mr. Rick Grewal,Advanced GeoEnvironmental, Inc., (AGE) has prepared this Preliminary Site Assessment Report (PSAR) for 4100 East Fremont Street, Stockton, California(the site). The scope of work for this investigation was to test for and assess any petroleum hydrocarbon-impact beneath the underground storage tank (UST) and dispenser island areas on the site. The location of the site is illustrated on Figure 1 - Location Map. A plan of the site is illustrated on Figure 2 - Site Plan. The investigation was performed in accordance with the guidelines of both the San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD) and the Central Valley Regional Water Quality Control Board for the investigation of underground storage tank (UST) sites. 2.0. BACKGROUND 2.1. SITE DESCRIPTION AND USAGE The site is located on the southeast corner of the intersection of Oro and Fremont Streets, in an area of low topographic relief in Stockton, California. The site is currently operated as a fueling facility and a min-market. One 10,000-gallon gasoline underground storage tank (UST), one 6,000-gallon gasoline UST and one 6,000-gallon diesel UST are currently located on the west section of the property; a waste oil UST was previously removed from the site in 1996. 2.2. REGIONAL GEOLOGIC SETTING Based on a Geologic Map of California, published in 1977 by the State of California Department of Mines and Geology, the subject property is located within the Great Valley Geomorphic Province of California, a large, elongate northwest trending, asymmetric structural trough. The Great Valley Province has been filled to its present elevation with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat lying alluvial plain, extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada Mountains, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin. The Great Valley Province is subdivided into two major divisions identified as the Sacramento and San Joaquin Valleys. Based upon the General Soil Map from the San Joaquin County Soil Survey, published by the United