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Additional Site Assessment Work Plan IDEALEASE 1137 South Stockton Street, Stockton, California 1.0. INTRODUCTION At the request of Idealease of Stockton,Advanced GeoEnvironmental,Inc. (AGE)has prepared this Additional Site Assessment Work Plan for the property located at 1137 South Stockton Street, Stockton,Califomia(site). The work plan is prepared,as directed by the California Regional Water Quality Control Board(CRWQCB)-prepared letter,dated 25 August 2009(Appendix A),to define the vertical and lateral extent of petroleum hydrocarbon-impacted soil and ground water beneath the site. The scope of work includes advancement of seven soil probe borings,for collection and analysis of soil and grab ground water samples, and advancement of four pilot borings, for the installation of ground water monitoring wells. The location of the site is illustrated on Figure 1.A plan of the site is illustrated on Figure 2. The CRWQCB also directed preparation of a work plan to remove contaminated source area soil (letter dated 25 August 2009). AGE proposes to prepare and implement a work plan to remove contaminated source area soil after the extent of the contaminated source area has been determined. This work plan is prepared in accordance with CRWQCB-Central Valley Region guidelines for the investigation of UST sites. 2.0. BACKGROUND The site is situated in an industrial and commercial area of west Stockton, San Joaquin County, California. Prominent features on the site include an office building, truck wash facility, fuel dispenser area and a single 1 2,000-gallon diesel above ground storage tank (AST). The surface primarily consists of asphalt and cement. A canopy covers the truck wash and dispenser area (Figure 2). During the removal and replacement of concrete southeast of the fueling islands,petroleum-impacted pea gravel was encountered, suggesting a subsurface leak of diesel from the AST fueling system. Elite IV Contractors was contacted to remove concrete overlying the subsurface product piping and evaluate for leakage.Upon removal of the concrete and exposure of the subsurface product piping, Elite IV noted leaking"clamshell' couplings in the area of the dispensers. Free product was noted within the shallow excavations and removed via a sump pump.It is our understanding that more than 60-gallons of free product was pumped from the shallow excavations.Elite IV subsequently repaired the piping and backfilled the excavations. Advanced GeoEnvironmen[al,Inc.