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Preliminary Site Assessment Work Plan Conti Trucking 2660 Loomis Road, Stockton, California 1.0. INTRODUCTION At the request of Mr. Gene Conti Jr. of Conti Trucking, Inc., Advanced Geo Environmental, Inc. (AGE) has prepared the enclosed Preliminary Site Assessment Work Plan for the property at 2660 Loomis Road, Stockton, California (the site). The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. This wort: plan is prepared as required by the San Joaquin County Public Health Services - Envirom-lental Health Division(PHS-EHD) for the investigation of unauthorized releases associated with underground storage tanks (USTs) and in accordance with Appendix A to Tri-Regional Recommendations - Reporting, dated 30 August 1991, prepared by the Central Valley Regional Water Quality Control Board (Appendix A - Reports). The purpose of this site assessment is to evaluate the lateral and vertical extent of petroleum hydrocarbon impact to soil and/or groundwater at the site. This work plan provides a description of the scope of work and procedures to be used in soil probe borings, soil and groundwater sample collection and analysis and soil boring abandonment. 2.0. BACKGROUND The site is located in an unincorporated commercial area of southern Stockton, California, at the end of Loomis Road. (Figure 1). The site is presently occupied by Conti Trucking, Inc. 2.1. SITE DESCRIPTION The majority of the site consists of unpaved dirt area used as a parking lot for trucks (Figure 2). A single story office facility and truck garage is presently located on the site. A domestic drinking water well is located approximately 150 feet northeast of the former UST area. 2.2. UNDERGROUND STORAGE TANK REMOVAL On 22 September 1999, two 10,000-gallon diesel USTs, were removed from the site by Elite Four, General Contractors. The approximate locations of the former USTs are shown on Figure 2. The two 10,000-gallon diesel USTs were located at the west end of the site. The excavation was not backfilled to surface grade and it presently remains open. Advanced GeoEnvironmental,Inc.