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Stantec February 18, 2011 Mr. Ken Sommers Page 3 of 6 Reference: Phase II Environmental Site Assessment Field observations of soil classification, color, soil discoloration, and odors will be logged. A photo- ionization detector will be used to monitor the soils and breathing zone during the hand augering of the boreholes. During the hand augering of the soil vapor boreholes, a soil sample will be collected from each of the boreholes at the designated soil vapor probe depth. The soil from the hand auger will be placed in a 16 ounce glass jar with a gloved hand. The soil will be packed into the jar to minimize the headspace in the jar prior to sealing the jar with a lid. The soil samples will be placed in a cooler with ice and sent to BC Laboratories, Inc. (BC Labs) a California state-certified laboratory. The samples will be shipped under chain-of-custody (COC) procedures. Based on the soil vapor analyses, selected soil samples will be analyzed for total petroleum hydrocarbons (TPH) fuel fingerprint, volatile organic compounds (VOCs), and the CAM 17 metals. The remaining samples were placed on hold at BC Labs. Once the maximum depth of the borehole is reached, soil vapor wells will be constructed within each borehole. Each soil vapor well will be constructed using a porous polypropylene implant set at approximately 4.5 to 5 feet bgs connected to '/<-inch diameter Nylaflow tubing. Stopcock connections will be placed at the ends of the tubing to seal the tubing above the ground surface and maintain the integrity of vapor point. A '/z or 3/< inch diameter section of PVC piping will be placed around the implant and tubing to keep the vapor implant centered in the borehole during the placement of the sand pack. A sand pack consisting of 1 foot of number 2/12 sand will be placed around each implant and extending above and below the implant screen. The PVC pipe will be removed once the sand pack is in place. The sand pack will be followed by 1 foot of dry granular bentonite. After the dry granular bentonite is in place, it will be followed by 2 feet of hydrated bentonite. The hydrated bentonite will be mixed in a bucket above grade and placed into the borehole. The hydrated bentonite will be gently packed in the borehole to create a seal. The upper 1 foot of the boreholes will be completed using a traffic rated box set in concrete. The box will be set slightly above grade so that drainage will be away from the traffic box. The soil vapor wells will be allowed to equilibrate for a minimum of 48 hours after the vapor probe installation. Investigation-derived waste including the soil and decontamination water generated during the hand augering operations will be segregated and containerized in 55-gallon Department of Transportation approved drums and staged in a safe location prior to analytical characterization. The drums will be labeled with Stantec's contact information clearly displayed. Waste soil cuttings and decontamination fluids will be sampled and analyzed for VOCs (8260B), semi-volatile organic compounds (8270), TPH fuel fingerprint (Luft method), and the CAM 17 metals. The drums will be stored on site until receipt of analytical results, then manifested for transport and proper disposal or recycling. It is assumed that the waste will be classified as non-hazardous. The disposal of the drums will be performed to a licensed waste disposal contractor. I'\Projects\Calpine\Lodi\Work Plan\Calpinel-odi.Work Plan.docz