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PRE-TANK REPLACEMENT Site Assessment Work Plan <br />4315 Waterloo Road Stockton, CA. <br />Aegis Project No. 89-047 <br />Page 1 <br />1.0 INTRODUCTION <br />This work plan describes the planned pre-tank replacement site <br />assessment at a Shell Oil Company (Shell) retail service gasoline <br />station located at 4315 Waterloo Road Stockton, San Joaquin County, <br />California (Figure 1). This work plan was requested by Shell in <br />preparation for the replacement of underground fuel storage tanks <br />located beneath the site. <br />1.1 Purpose <br />The purpose of the investigation is to: <br />Characterize the site subsurface soil and hydrologic conditions. <br />Assess the presence of petroleum hydrocarbons (if any) in the <br />soil beneath the site. <br />Verify the soil conditions at the proposed location of the new <br />underground fuel-storage-tank cluster. <br />Evaluate the need for further assessment and /or mitigation of <br />petroleum constituents in soil and ground water beneath the site, <br />prior to the tank closure/replacement. <br />1.2 Scope <br />A detailed work plan is presented in section 3.0. The scope of work <br />summarized below. <br />Drill four soil borings to an estimated maximum depth of 20 feet <br />below grade in the area of the existing underground fuel storage <br />tanks. <br />Drill six soil borings to estimated maximum depths of 20 feet <br />below grade at the location of the replacement underground fuel <br />storage tanks. <br />Drill four soil borings to estimated depths of 10 feet below <br />grade around the pump islands to assess the condition of the <br />existing product lines. <br />Recover from each of the borings representative soil samples at <br />five-foot intervals.