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Preliminary Subsurface Investigation Work Plan Koppel Stockton Terminal 2025 West Hazelton Avenue, Stockton, California 1.0. INTRODUCTION At the request of Ms. Leah Goldberg representing the Munzer Family Trust, Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Preliminary Subsurface Investigation Work Plan for the former diesel underground storage tank (UST) area at 2025 West Hazelton Avenue, 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 work plan is prepared 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) for the investigation of unauthorized releases associated with USTs. 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 industrial area of west Stockton, in the Port of Stockton (Figure 1), immediately west of the intersection of West Hazelton Avenue and Ventura Avenue. 2.1. SITE DESCRIPTION A large warehouse structure is located on the property, as well as loading docks, a truck scale and water tank. The site was formerly operated as an agricultural feed mixing facility. Presently, the site is unoccupied. The major portion of the site is unpaved. (Figure 2). 2.2. UNDERGROUND STORAGE TANK REMOVAL It is our understanding that two USTs were removed from the site in September 1989. The USTs were apparently located near the entrance to the facility, adjacent to the 1951 West Hazelton property. The approximate locations of the former USTs are shown on Figure 2. Two soil samples were collected from the floor of the UST excavation. Total petroleum hydrocarbons quantified as diesel (TPH-d) were reported in one soil sample at 62 milligrams per kilogram (mg/kg). Benzene, toluene, ethylbenzene, xylenes (BTEX), ethylene dibromide (EDB) or Advanced CcoEmirmnnental, Inc.