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Stantec February 18, 2011 Mr. Ken Sommers Page 2 of 6 Reference: Phase II Environmental Site Assessment VAPOR PATHWAYS The only restrooms on the site are located in the southeast corner of the southern warehouse. The sewer lateral extends south of the building and could create a vapor pathway. No additional utility trenches are known on the Site. SCOPE OF WORK Task 1 — Health and Safety Plan Stantec will prepare a site-specific Health and Safety Plan (HASP) to establish health and safety guidelines to minimize the risk of occupational accidents and exposure to substances at the site. The HASP will fulfill the requirements of the Cal-OSHA Hazard Communications Standard (8 CCR 5194). The HASP shall provide emergency incidence response guidelines and contacts in the event of an occupational accident or hazardous substance exposure. Task 2 — Permitting Stantec will submit to the San Joaquin County EHD, the paperwork for the Master File Record for the Site, the well permit application for the soil vapor wells, and the licensed contractor declaration. Task 3 — Underground Utility Clearance Prior to any field work, Stantec will mark the potential boring locations with white paint and will then contact Underground Service Alert (USA). USA will notify the local underground utility companies so that they can delineate the locations where subsurface utilities exist on the Property, as required by State of California law. USA will provide a ticket number for the utility clearance at the site. Task 4 — Installation of Soil Vapor Probes A total of 6 soil vapor boreholes will be installed as part of the soil vapor survey (Figure 1). The probe locations were chosen based on historic usage of the Site. Five of the six soil vapor probes will be placed within the two warehouses at the Site. The sixth borehole will be place adjacent to the sewer lateral. Stantec personnel will use a concrete saw to cut through the concrete slabs in the northern and southern warehouses and through the asphalt near the sewer lateral. Once the surface material is removed, the boreholes will be advanced using a 3.25-inch-diameter hand auger. The boreholes will be advanced to a maximum depth of approximately 5 feet below the ground surface (bgs). The hand auger will be decontaminated prior to the drilling of each soil vapor sampling borehole to prevent cross contamination. I:\Projects\Calpine\Lodi\Work Plan\CalpineLodi.Work Plan.docx