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SOIL BORING INSTALLATION WORK PLAN <br /> Brannon Tire <br /> 540 North Hunter Street <br /> Stockton, California <br /> 1. 0 INTRODUCTION <br /> In accordance with a request from Mr. Tim Gill of the Wagner <br /> Corporation, Geological Audit Services, Inc. (GeoAudit) has <br /> prepared this work plan to drill two (2) soil borings at 540 North <br /> Hunter Street, Stockton, California (the site) . The location of the <br /> site is illustrated on Figure 1. A plan of the site is illustrated <br /> on Figure 2 . <br /> 2.0 BACKGROUND <br /> The site is located in a flat industrial/commercial area of central <br /> Stockton (Figure 1) . The site is underlain by unconsolidated <br /> Quaternary alluvial sediment. The upper twenty feet consists of <br /> clayey sands to silty sands. Groundwater is estimated at 45-55 feet <br /> below surface grade (San Joaquin County Department of Public Works, <br /> Flood Control Section, 1990) . <br /> According to an inspection report by the San Joaquin County Public <br /> Health Services - Environmental Health Division (PHS/EHD) , four <br /> underground storage tanks (UST) were removed from the site in March <br /> of 1988 by NorCal Construction. Two 500-gallon tanks containing <br /> waste oil , one 1, 000-gallon tank containing unleaded fuel and one <br /> 1, 000-gallon tank containing an unknown fuel were removed from the <br /> site. For sampling purposes, the tank containing the unknown fuel <br /> was treated as an unleaded tank by the PHS/EHD. <br /> Soil samples were collected from beneath the tanks and analyzed by <br /> Canonie Environmental Laboratories. The soil samples did not <br /> indicate that contamination was present. However, in September of <br /> 1993 , the Wagner Corporation was notified by the PHS/EHD that the <br /> method detection limits (MDL) used for the soil sample analysis was <br /> too high. <br /> 3 . 0 PROPOSED ASSESSMENT i SAMPLING <br /> The PHS/EHD stated that two soil borings should be drilled near the <br /> former tank excavation(s) to obtain a closure letter. Therefore, <br /> GeoAudit proposes to drill one (1) soil boring near the former tank <br /> cluster at the eastern portion of the property and (1) soil boring <br /> near the former waste oil tank on the western portion of the <br /> property. One soil sample from each soil boring will be collected <br /> at a depth of 15 feet. Details of the proposed program are given below: <br /> 1 <br />