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Preliminary Site Assessment Work Plan LAGORIO-ACE TOMATO 5458 Section Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Dean Janssen, Advanced GeoEnvironmental, Inc. (AGE) has prepared this Preliminary Site Assessment Work Plan for Lagorio-Ace Tomato, located at 5458 Section Road, Stockton, California (site). The location of the site is illustrated on Figure I - Location Map. A plan of the site is illustrated on Figure 2 - Site Plan. The San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) has directed by letter dated 9 June 1999, the preparation of a work plan to assess the subsurface petroleum hydrocarbon impacts related to former underground storage tanks (USTs) at the site. This work plan is prepared in accordance with (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of UST sites. The purpose of the proposed investigation is to assess the petroleum hydrocarbon impact to soil beneath the former UST system. This work plan provides a description of the scope of work and procedures for collection of soil and grab ground water samples. Z.O. BACKGROUND The property 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 of the 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. The estimated depth to ground water at the site is between 60 and 70 feet below surface grade (bsg) based on information from Lines of Equal Elevation of Groundwater - Lines of Equal Depth to Groundwater Fall 1997, published by the San Joaquin County Flood Control and Water Conservation District. Based on review of a regional ground water elevation map published by San Joaquin County, the prevailing ground water flow direction near the site is generally toward the south-southeast, although flow directions may be both locally and seasonably influenced by changing recharge and discharge conditions. Advanced GeoEnvirunmental,Inc.