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WORK PLAN ADDENDUM <br /> December 1995 <br /> Larry's Auto Repair <br /> 308 North Grant Street <br /> Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Charles Skobrak,Advanced GeoEnvironmental, Inc. (AGE) <br /> has prepared this Work Plan Addendum for additional soil and ground water investigation at 308 <br /> North Grant Street in Stockton, California. The scope of work includes the drilling of five vadose- <br /> zone wells, two combination ground water monitoring/vadose-zone wells and four ground water <br /> monitoring wells. After drilling has been completed, a soil vapor extraction (SVE) pilot test will be <br /> performed and a Corrective Action Plan(CAP) prepared. <br /> The Work Plan Addendum is prepared in accordance with San Joaquin County Public Health Services <br /> Environmental Health Division and Central Valley Regional Water Quality Control Board guidelines <br /> for the investigation of underground storage tank (UST) sites. <br /> 2.0. BACKGROUND <br /> 2.1. SITE LOCATION <br /> The site is located in a flat commercial area in central Stockton, on the northeast corner of the <br /> intersection of Grant Street and Miner Avenue (Figure 1). The site is operated as Larry's Auto <br /> Repair. The property is occupied by a single building, attached canopy and parking area(Figure 2). <br /> 2.2. UNDERGROUND STORAGE TANK REMOVALS <br /> In April 1987, one underground storage tank (UST) was removed from the site. Two additional <br /> USTs were removed in May 1990. Petroleum hydrocarbons were detected in soil samples collected <br /> beneath each tank. <br /> 2.3. SUBSURFACE INVESTIGATION <br /> An initial subsurface assessment was performed by WaterWork Corporation. One soil boring was <br /> advanced to a depth of approximately 35 feet below surface grade (bsg) near the area of highest <br /> concentration of soil contamination detected during the tank removal. Ground water was encountered <br /> at a depth of 32 feet. <br />