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S EC0R <br /> Mr. Michael Infurna <br /> San Joaquin County Environmental Health Department - <br /> :March 27, 2007 <br /> Page 3 of 8 <br /> OBJECTIVE AND SCOPE OF WORK <br /> The objectives of the proposed scope of work are: 1) to investigate-for the presence of <br /> unknown underground storage tanks _(USTs) or .relatedproduct lines. in the area of <br /> previous investigation; 2) to further delineate the extent and magnitude of petroleum <br /> hydrocarbon impacts to soil; and 3) to determine if shallow groundwater has been <br /> ,affected. <br /> J <br /> The.work will be completed using a phased approach. First, SECOR will complete a <br /> geophysical survey to confirm the presence or absence of USTs or related piping which <br /> .may be responsible for petroleum hydrocarbon impacts observed in soils. The survey <br /> will have the additional benefit of identifying utility lines in the work area,and:confirming <br /> that proposed soil boring -locations are free of subsurface lutilities. Then, SECOR will <br /> advance soil borings for collection of soil and' grab groundwater samples. If obvious <br /> chemical impact to groundwater, is observed (such as free-phase product, strong odor, <br /> or impacted soils in contact with groundwater), SECOR`will install, develop,and survey <br /> three groundwater'monitoring wells: <br /> The scope of work is summarized below by task: <br /> Task 1 - Preliminary activities; <br /> Task 2—Geophysical survey and utility clearance; <br /> Task 3 —Soil and groundwater investigation; and <br /> Optional Task 4— Installation of groundwater monitoring wells and related tasks. <br /> These work tasks are discussed in detail in the following sections. <br /> Task 1 — Preliminary Activities <br /> 'SECOR will obtain a drilling permit from the San Joaquin County Environmental Health <br /> Department (SJCEHD), and coordinate the field work.with SJCEHD staff. In order to <br /> streamline completion-of the work, the permit will assume the installation of soil borings <br /> and groundwater monitoring wells, although. wells may not :be installed. SECOR will <br /> update the Site-specific health and safety. plan (HASP) to include the proposed scope of <br /> work and associated physical,and chemical~hazards: SECOR will.mark the work area in <br /> white paint and notify Underground Service Alert at least 48_hours before drilling. <br /> ;i:\PG&E\French Camp\additional 2007 investigation\work plan\2007 Investigation Work Plan_Final.doc March 27;2007 <br /> Project No.050T.50351.01 <br />