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PROPOSED WORK PLAN FOR PRETANK CLOSURE SITE ASSESSMENT <br /> SHELL SERVICE STATION <br /> 3725 TRACY BOULEVARD <br /> TRACY, CALIFORNIA <br /> DELTA PROJECT NO. 40-89-012 <br /> 1.0 INTRODUCTION <br /> Delta Environmental Consultants, Inc. (Delta), has been authorized to conduct an .assessment to <br /> evaluate the distribution and concentration of petroleum constituents in soils beneath the Shell <br /> service station at 3725 Tracy Boulevard.in Tracy, California(see Figure 1). The assessment is being <br /> conducted prior to excavation and removal of existing underground storage tanks, installation of new <br /> tanks, and service station facility rebuilding. <br /> Soil samples collected by Kleinfelder&Associates from soil borings near the existing tanks in 1985, <br /> and soil and water samples collected by Canonie Engineers, Inc., from beneath the tanks in <br /> November 1985, indicate the presence of petroleum hydrocarbons. This assessment is intended to <br /> define the extent of soils containing :petroleum constituents at the existing and proposed tank <br /> locations. Once the extent is known, the volume of soils containing petroleum hydrocarbons can be <br /> calculated and soil remediation options for use during the tank removal and replacement can be <br /> Lproposed. Upon removal of the existing tanks, soil samples,will be collected from beneath the tanks <br /> as directed by the San Joaquin County Health District and submitted to a state-certified laboratory <br /> for chemical analysis. <br /> 1.1 Purpose <br /> The pretank closure site assessment will be undertaken to: <br /> Determine whether soils adjacent to the existing tank basin contain detectable <br /> concentrations of petroleum constituents. <br /> Determine the distribution and extent of petroleum constituents in the soils if petroleum <br /> hydrocarbons are detected. <br /> Determine whether soils in the area of the proposed new tank basin contain detectable <br /> concentrations of petroleum constituents. <br /> Develop a soil management plan for the tank-removal and replacement procedure. <br /> 0 Evaluate the need for additional investigative or remedial action. <br />