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4. OBJECTIVES AND METHODOLOGY <br />This section outlines the objectives and methodology proposed for the field <br />studies to be performed during this site investigation. Any significant <br />deviations from this work plan will be communicated to the appropriate <br />agencies prior to performing the work. <br />4.1 Preliminary Field Work <br />Preliminary field activities will include obtaining well permits from the <br />San Joaquin County Department of Environmental Health, obtaining subsurface <br />utility clearance, and obtaining and organizing field equipment and <br />materials needed to perform all necessary field work. <br />IThe following tasks are proposed to accomplish this objective: <br />1 3542a/BAV102 7 <br />Arrangements will be made to ensure that drilling and sampling equipment, <br />construction and sampling materials, and experienced labor will be available <br />at the site to begin and continue field operations. PG&E plans to perform <br />the drillling and sampling operations with PG&E personnel and equipment. <br />Prior to drilling operations, the logistics of the storage and disposal of <br />wastes generated during this investigation will be determined. These wastes <br />will include soil from drilling and sampling activities, groundwater <br />extracted during well development and sampling activities, water collected <br />from steam -cleaning activities, and disposable personal protective <br />disposal <br />equipment. Further details of waste storage and procedures are <br />included in Section 8. <br />4.2 Define the Vertical and Horizontal Distribution of Gas Plant <br />Residues <br />This objective will be accomplished by using field and analytical results of <br />soil samples collected from approximately 31 borings, and groundwater <br />samples collected from 10 monitoring wells located across the site to <br />develop areal and cross-sectional distribution maps of selected constituents <br />1 <br />associated with gas plant residues. <br />IThe following tasks are proposed to accomplish this objective: <br />1 3542a/BAV102 7 <br />