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i i QUARTERLY REPORT February 1994 I Larry's Auto Repair 308 North Grant Street Stockton, California I 1.0 INTRODUCTION IIn accordance with a request from Mr Charlie Skobrak, Geological Audit Services, Inc (GeoAudit) has prepared this report summarizing assessment and monitoring activities I performed during the first quarter o€1994 at 308 North Grant Street in Stockton, California (the site) Four monitoring wells and one soil boring were installed and sampled. The purpose of this investigation was to assess the lateral extent of affected soil and potential groundwater contamination, and determine the direction of groundwater flow beneath the site The project background, procedures, findings, and conclusions are presented in the fallowing sections I2.0 PROJECT BACKGROUND 2.1 Land Use The site is located in a flat commercial area in central Stockton, on the northeast corner of the intersection Grant Street and Miner Avenue (Figure 1) The site is operated by Larry's Auto Repair The property is occupied by a single building, attached canopy and parking area 2.2 Underground Storage Tank Removals On April 24, 1987, a 1,000-gallon gasoline underground storage tank (UST) was removed from the northwest side of the property (Tank A). A soil sample collected from beneath the former tank contained elevated levels of benzene, toluene, ethylbenzene, and xylenes (BTE&X) Two additional 1,000-gallon tanks (Tank B and C) were removed from the southern portion of the property on May 25, 1990 by Thorpe Oil Company. Tank B contained diesel fuel and Tank C contained leaded gasoline, The Iocations of the former tanks are presented on Figure 2 An initial subsurface assessment was performed below Tank A by WaterWork Corporation One soil boring was advanced to a depth of approximately 35 feet below ground surface (bgs) near the area of highest soil contamination detected during the tank removal C-1-s-1Au&1 s..—101 lsrry r Auto Repair QtE/L9ULl7 3 r