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PRETANK CLOSURE SITE ASSESSMENT <br /> Shell Service Station <br /> 3725 Tracy Boulevard, Tracy, California <br /> Delta No. 40-89-012 14 189 <br /> EfdVPERMITH!SERVICES <br /> I TR DU TI N <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized to conduct an <br /> assessment to evaluate the distribution of petroleum constituents (if present) in soils <br /> beneath the Shell service station at 3725 Tracy Boulevard in Tracy, California (see <br /> L Figure 1). The assessment is being conducted prior to excavation and removal of existing <br /> underground storage tanks, installation of new tanks, and service station facility <br /> rebuilding. <br /> The assessment is intended to determine whether soils surrounding the existing tanks <br /> contain petroleum constituents. If petroleum constituents are present, the assessment <br /> will allow for an estimate of the volume of soils that would be removed during the tank <br /> Lreplacement activities and propose a treatment plan to reduce petroleum constituent <br /> concentrations to acceptable levels for disposal at a Class IIII landfill. Upon removal <br /> of the existing tanks, soil samples will be collected from below the tanks as directed <br /> L by the San Joaquin County Health District and submitted to a state-certified laboratory <br /> for analysis. <br /> ' I <br /> L � <br /> 1.1 Purpose <br /> The pretank pull soil assessment will be undertaken to: <br /> • Determine if soils adjacent to the existing tank basin contain detectable <br /> concentrations of petroleum constituents. <br /> • If the soils do containetr leum <br /> p o constituents, determine the distribution and <br /> extent of these constituents. <br /> • Determine if soils in the area of the new tank basin contain detectable <br /> concentrations of petroleum constituents. <br /> Develop a soil management plan for the tank closure. <br /> • Evaluate the need for additional investigative or remedial action. <br /> f <br />