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Preliminary Site Assessment Work Plan - South UST Area FIRE STATION #2 110 West Sonora Street, Stockton, California 1.0. INTRODUCTION At the request of the City of Stockton, .=ldvanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Preliminary Site Assessment Work Plan- South UST Area for the property located at 110 West Sonora Street, Stockton, California(the site). The location of the site is illustrated on Figure 1 and a plan of the site is illustrated on Figure 2. This work plan is prepared at the request of the San Joaquin County Environmental Health Department (EHD) by letter dated 30 May 2002. Procedures outlined within the work plan are described in accordance with the California Regional Water Quality Control Board- Central Valley Region (CRWQCB-CR) guidelines for the investigation of UST sites. 2.0, BACKGROUND The site is bounded on the north by Sonora Street, on the west and south by Madison Street and on the east by Commerce Street. Presently a single building is located at the northern portion of the site, occupied by the City of Stockton - Fire Prevention Department. A diesel/gasoline fueling system previously occupied the northwestern portion of the site; a petroleum hydrocarbons release from the associated underground storage tanks (USTs) is presently being remediated. The properties surrounding the site are mostly industrial, with a few residences east of the site. 2.1 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been filled 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, respectively. Rocks composing the basement complex ofthe province have not been completely defined but are believed to be metamorphic and igneous in origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. Based on the General Soil Map from the Sari Joaquin County Sail Survey, published by the United States Department of Agriculture Soil Conservation Service in 1992,the soil type within the site area is poorly drained Jacktone clay,in large areas covered by urban land. Jacktone soils are located within basins, and generally form in alluvium derived from mixed rock sources. ldvanced OeoEnvironmentnl.Inc