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4 <br /> SITE ASSESSMENT WORK PLAN (EXCAVATION) Aly&Kbits- <br /> Don's Buggie Shop <br /> 3245 North Wilson Way <br /> Stockton, California <br /> March 1994 <br /> 1.0 INTRODUCTION <br /> In accordance with a request from Mr. Don Morris of Don's Buggie Shop, Geological Audit <br /> Services, Inc. (GeoAudit) has prepared this work plan to perform excavation procedures at <br /> 3245 North Wilson Way, Stockton, California (the site). The location of the site is <br /> illustrated in Figure 1. A plan of the site is illustrated in Figure 2. The history of the site, <br /> previous investigations, and proposed excavation are discussed in the following sections. <br /> 2.0 BACKGROUND <br /> Don's Buggie Shop is an automotive service facility specializing in Volkswagon repair. It <br /> is our understanding that a 1,000-gallon underground storage tank (UST) containing regular <br /> gasoline was removed from the site by AAA Tank Removal in February 1991. Two soil <br /> samples were collected from beneath the tank, and two samples were collected from the <br /> product line trench. Total petroleum hydrocarbons in the gasoline range (TPH-g) were <br /> reported at concentrations of 2,200 and 6,600 mg/kg (ppm) in the _tank samples, and <br /> ethylene dibromide (EDB) was also detected at elevated levels. Volatile aromatic <br /> hydrocarbons (benzene,toluene,ethylbenzene, and xylene)were preselit in the tank samples <br /> and in one of the product line samples. <br /> A preliminary assessment was performed by GeoAudit on March 2, 1994. Four soil borings <br /> (B1 through B4) were drilled and sampled in and near the location of the former UST. <br /> Borings B1 and B4 were terminated vertically at 38 and 60 feet below ground surface (BGS), <br /> respectively. Borings B2 and B3 were terminated vertically at 30 feet BGS. Soil was <br /> screened for organic vapors using a photo-ionization detector(PID: Thermo Environmental <br /> 580A, 10.0 eV, calibrated to isobutylene). Soil samples were not analyzed in Boring B2 and <br /> B3 due to the absence of organic vapors. Soil samples from Boring B1 were analyzed at <br /> depths of 25, 30, and 35 feet; soil samples from Boring B4 were analyzed at depths of 50, <br /> 55, and 60 feet. The analytical results are presented as Table 1. <br /> In order to obtain financing for site improvements, Mr. Morris has requested the <br /> overexcavation of the reported contamination. <br /> G-1.0.1 Audit Soaks,I.. <br /> 9Nl3A4/BUGOY-71 1 <br />