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SECTION 4 <br /> SAMPLING AND ANALYSIS PLAN <br /> This section outlines the RI project objectives, the strategy proposed to <br /> achieve the objectives, and the methodologies to be used during the <br /> investigation. The activities proposed in this section are based on <br /> information available from previous investigations reported by Public <br /> Works. <br /> This RI Workplan was prepared in accordance with USEPA guidance <br /> for remedial investigations (USEPA 1988). Where applicable and <br /> appropriate, the investigation will also follow the State Water <br /> Resources Control Board (SWRCB) Leaking Underground Fuel Tank <br /> (LUFT) Manual (SWRCB 1989), and the Tri-Regional Board Staff <br /> Recommendations For Preliminary Evaluation and Investigation of <br /> Underground Tank Sites (Tri-Regional Board 1990). <br /> RI Objectives and Strategy <br /> Based on the available information, the objectives of this investigation <br /> are to: <br /> • Determine the current direction of groundwater flow; <br /> • Determine the vertical and lateral extent of fuel-affected soil; <br /> • Determine the extent of fuel-affected groundwater; and <br /> • Determine the physical, chemical, and hydraulic properties of the <br /> soil and use this information to assist in selecting and designing the <br /> appropriate remediation alternative. <br /> The information obtained from this investigation will be integrated <br /> with past data and used to evaluate corrective actions that may be used <br /> to remediate both soil and groundwater. <br /> To achieve the objectives stated above, the results of the RI will be used <br /> to determine the need for remedial action and to provide a basis for <br /> evaluating remedial alternatives. Two phases of field work are <br /> planned for each UST site: <br /> 4-1 <br />