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Ms. Lori Duncan S E C O R May 27, 2005 Page 4 groundwater will be bailed from the drive rods, decanted from the bailer into 40-m1 VOA vials, and capped. Each VOA vial will be checked to ensure no bubbles are present, labeled, placed on ice, and transported to the laboratory under chain-of-custody documentation. The drive rods will be retracted, leaving the disposable drive tip and 4 foot length of PVC well screen in the hole. • Soil Selection and Sample Analysis. Soil samples from each of the soil borings will be collected at five-or ten-foot intervals (depending on drill rig capability) and will be sent under chain-of-custody protocol to a California state-certified laboratory. Soil samples showing positive readings on a photo-ionization detector (PID) and/or at least three soil samples from each boring will be analyzed for total petroleum hydrocarbons as gasoline (TPHg); benzene, toluene, ethylbenzene, and total xylenes (BTEX), methyl-tert-butyl ether (MTBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether (DIPS), ethyl tertiary butyl ether (EtBE), tertiary-butyl alcohol (TBA), chlorobenzene, dichlorobenzene, 1,2-dichloroethane (1,2-DCA) and ethylene dibromide (EDB), methanol, and ethanol by EPA Method 82608. Hydropunch groundwater samples will be analyzed for the same compounds. • Well Installation. New groundwater monitoring well MW-10 will be installed in the same manner as the replacement monitoring wells previously proposed. • Soil and Water Disposal. Soil cuttings and water generated during drilling operations and well development will temporarily be stored on-site in California Department of Transportation (DOT)-approved 55-gallon steel drums pending characterization and disposal. The drums will be removed and transported by a licensed disposal contractor to an appropriate treatment or disposal facility. Soil cuttings and rinsate/purge water drums will be temporarily stored on-site for approximately 2 to 4 weeks. • Report. Following the completion of well installation activities, SECOR will submit a report documenting the findings of the investigation. The report will include soil boring logs, soil and groundwater analytical results, chain-of-custody documentation, and conclusions/recommendations. SCHEDULE SECOR is prepared to initiate the coordination of fieldwork activities after the Chevron station rebuild is complete, upon approval of the work plan for site assessment by the SJCEHD, and following the receipt of necessary permits. A report documenting the completion of this scope of work will be submitted approximately six to eight weeks following the completion of fieldwork activities and upon receipt of laboratory analytical data.