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10/11/2002 13:06 707-58F 0900 VERTEX ENG PAGE 08/13 • The VOC sample containers will be filled and scaled without headspace or bubbles; • Groundwater samples will be stored in an ice cooler at approximately 4°C; • Chain-of-Custody forms will be completed and taped to the inside lid of the cooler; Upon completion of the groundwater sampling, each borehole will. be abandoned using the tremie grouting method. VERTEX will arrange with San Joaquin County Environmental Health Department staff to observe the grouting procedure at the site to ensure that this work is performed to their satisfaction. Decontamination of equipment will be performed to reduce the potential for transport of contaminants off-site and between work areas. Decontamination of drilling equipment and monitoring well materials will occur if necessary, at the designated decontamination station. Any parts of the drill rig that are encrusted with dirt or mud or are suspected of having been splashed with materials at a sampling station will be washed with high pressure water and steam prior to moving to the next borehole location. Drill rigs may be protectcd with plastic sheeting to minimize contamination of major body parts. The drilling and sampling equipment will be washed with Alconox and water, then rinsed with clean water. New disposable bailers or Teflon tubing will, be used at each sampling location. Decontamination water will be, containerized and disposed of in an environmentally safe manner. A total of four (4) groundwater samples will be collected and submitted to a DHS-certified laboratory using chain-of-custody protocol. In addition, for quality assurance/quality control (QA/QC) one trip blank will be prepared and. submitted to the Laboratory using chain-of-custody protocol. The laboratory will analyze all. samples for the following parameters: • VOC's by EPA Method 8260, including Fuel Oxygenates Water sample analysis will undergo formal QA/QC data validation at the laboratory to ensure that data are of acceptable quality. SunStar Laboratories, Inc. of Tustin, California is scheduled to analyze all groundwater, and QA/QC samples. The turnaround time from sample collection to the submission of analytical results is expected to be approximately 24-hours, The slipping address for SunStar Laboratories is presented below: SunStar.La.boratories,Inc. 3002 Dow Avenue, Suite 406 Tustin,Califomia 92780 The samples will be collected into pre-cleaned certified containers. SunStar Laboratories will provide these containers and appropriate preservatives. Sample containers will be ICHEM 200 series or equivalent. Samples will be placed immediately after collection into coolers for storage and shipment. At least two bags of ice, sealed in double plastic bags (or packets of blue ice)will 4