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------------------ <br /> Work Plan For Additional Groundwater Delineation and Ozone Microsparge System Installation,Tosco(Former BP)Station No.11195 <br /> September 19,2002 <br /> The new wells will be constructed of 2-inch-diameter schedule 40 polyvinyl chloride (PVC) <br /> well casing and 0.02-inch machine slotted PVC well screen. The screened interval will <br /> extend from approximately 5 feet above to 10 feet below groundwater, which is anticipated <br /> to be encountered at approximately 10 feet bgs. Proposed groundwater well construction <br /> details are shown on Figure 3. <br /> Soil samples for description and possible chemical analysis will be obtained from the <br /> borings at a minimum of 5 foot intervals and will be collected with a split-spoon sampler <br /> fitted with clean brass sample liners. The actual number of samples submitted for <br /> chemical analysis will depend on site conditions and field screening data. As a <br /> minimum, it is expected that one unsaturated soil sample from each boring will be <br /> submitted for chemical analysis as described in Task 5. <br /> Soil from each sampled interval will be screened in the field for the presence of volatile <br /> organic compounds using a photoionization detector (PID). These data will be collected <br /> for reconnaissance purposes only, and will not be used as verification of the presence or <br /> absence of petroleum hydrocarbons. Screening data will be recorded on the boring logs. <br /> Drill cuttings will be stockpiled at the site pending receipt of chemical analytical data. <br /> Stockpiled cuttings will be placed on and covered with plastic sheeting pending disposal. <br /> Four samples of the drill cuttings will be collected for disposal characterization as <br /> described in Appendix A. These samples will be submitted to the laboratory for <br /> compositing into one sample, and then analyzed as described in Task 5. Upon <br /> acceptance, drill cuttings will be removed from the site and transported to Allied Waste's <br /> Forward Landfill in Manteca, California. <br /> Task 3. Wellhead Survey <br /> Following installation, a California licensed surveyor will measure the elevation of the well <br /> casings, relative to mean sea level. The horizontal and Global Positioning System (GPS) <br /> coordinates of the wells will also be obtained at this time. <br /> Task 4. Well Development and Sampling <br /> The newly installed groundwater monitoring wells will be developed after being allowed to <br /> stand a minimum of 72 hours following installation. Groundwater samples will be <br /> collected immediately upon completion of well development. Rinsate water and <br /> groundwater purged from the wells during development and sampling will be transported to <br /> the Tosco Refinery in Rodeo, California for disposal. The groundwater samples will be <br /> analyzed to assess groundwater quality as described in Task 5. <br /> 140193.14 3 <br />