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%0/ Preliminary Site Assessment Work Plan MARTINI AUTOMOTIVE 4032 North El Dorado Street, Stockton, California 1.0. INTRODUCTION At the request of Bob Eustis,Advanced GeoEnvironmental, Inc. (AGE) has prepared the enclosed Work Plan for the site at 4032 North El Dorado Street, Stockton, California. The Work Plan presents the proposed scope of work to evaluate the vertical and lateral extent of petroleum hydrocarbon impacts at 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 has been prepared as required by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD)by letter dated 13 January 1999. Additionally,this work plan is prepared in accordance with PHS-EHD and Central Valley Regional Water Quality Control Board (RWQCB) guidelines for the subsurface investigation of underground storage tanks (UST) sites. The purpose of this site assessment is to evaluate the lateral and vertical extent of petroleum hydrocarbon impact to soil and groundwater at the site. This Work Plan provides scope of work and a description of the procedures to be used to advance the soil probe borings, collect soil and possibly ground water sample collection and analysis and for soil boring abandonment. 2.0. BACKGROUND The site is located in a business/agricultural area of central Stockton, California, in San Joaquin County(Figure 1). The property currently is being used as an automotive service station and formerly has been a gasoline station. The site is located at the intersection of El Dorado Street and Churchill Street. 2.1. UNDER GROUND STORAGE TANK OPERATION AND REMOVAL • On 25 September 1998 one small (-125 gallon)underground storage tank (UST), drop tube line and vent line were removed from the site. Tracking records for waste removed from the UST should have been supplied to the PHS-EHD in the UST removal report. History of the UST use, tank tests, product inventory and repairs are not known to AGE. • During the removal of the UST hydrocarbon-impacted soil was encountered. The soil stockpiled on the site was sampled for laboratory analysis during the UST removal. The locations of the stockpile at that time are depicted on Figure 2. • The soil had been impacted by low concentrations of total petroleum hydrocarbons quantified as diesel and gasoline (TPH-d and TPH-g). See Table 1 for soil sample concentrations.