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Work Plan for Additional Sile tsessment • ARCO Facility No. 6100 Tracy,California Page 10 cooler. The sampler will be removed from the borehole and decontaminated after each sample is collected. Samples will be forwarded to a California state-certified analytical laboratory for chemical analysis. Strict chain-of-custody procedures will be followed from the time the sample is collected until the time the sample is relinquished to the laboratory. Task 3: Laboratory Analysis Soil and groundwater samples will be analyzed for TPHG using USEPA Method 8015/8020 DHS LUFT, for methanol using USEPA Method 8015 modified, and for BTEX, MTBE, ethyl tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), 1,2-dichloroethane (1,2-DCA), ethanol, and ethylene dibromide (EDB) using USEPA Method 8260B. Task 4: Waste Management Drilling mud, water, and soil cuttings generated during mud rotary drilling will be stored in a self-contained compartmentalized soil bin. Soil cuttings generated during air-rotary casing-hammer drilling will be stored in a roll-off bin. Wastewater generated will be properly containerized and hauled to an appropriate disposal facility. The containers will be stored on site pending disposal. A composite sample will be collected from the soil cuttings and chemically analyzed to determine an appropriate disposal method. Task 5: Report Preparation Following receipt of all analytical results, a report documenting the findings of the investigation will be prepared. The report will include, but not be limited to, analytical tables, a scaled site plan, geologic cross sections, boring logs, geophysical logs, certified analytical report, and general findings of the assessment. The report will be submitted to San Joaquin County PHS/EHD and CRWQCB within five weeks of receipt of all analytical reports. SCHEDULE Delta submitted anaccess agreement to the owner of the property located southeast of the site on April 4, 2001. To date we have not received a signed agreement. Several attempts to gain access to this property were also made last year. Upon receiving approval of this work plan and access to the offsite property, Delta will schedule the work and submit a well permit application package to San Joaquin County PHS/EHD. It will likely take approximately four weeks for the drilling contractor to become available. The drilling should be completed within four weeks of initiation. The CAARC0\6100\REP0RTS\6100 workplan 05-22-Ol.doe