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• 4 Tosco Corporation A Subsidiary of Phillips Petroleum Company ,lune 27 2002 Tosco Service Station No 4409 1502 El Dorado Street Stockton CA groundwater monitoring well installations are provided as Attachment B • Soil Selection and Analysis. Soil samples will be collected at 5-foot intervals and will be sent under chain-of-custody procedures to a California state-certified laboratory Soil showing positive readings on a PID or at least one sample for every fifteen feet of drilling will be analyzed for TPHg, benzene, toluene, ethylbenzene, total xylenes (collectively BTEX), and MtBE by EPA Method 8260B (single run) • Monitoring Well Development and Sampling. After installation, the monitoring wells will be developed by rigorously surging each well over the length of the screen interval, and purging approximately 10 casing volumes of water After well development, groundwater samples will be collected from the newly installed wells and sent under standard chain-of-custody procedures to a California State- certified laboratory The groundwater samples will be analyzed for TPHg, BTEX, and MtBE by EPA 8260B (single run) Field procedures for groundwater monitoring well development and sampling are provided as Attachment B • Well Surveying. Upon completion of well construction, the wells will be surveyed by a licensed surveyor to a local benchmark relative to mean sea level The groundwater gradient will be interpreted utilizing wellhead elevations and depth-to-water measurements • Soil and Water Disposal Soil cuttings generated during drilling operations will be temporarily stored on-site and covered with plastic sheeting pending characterization and disposal Soil cuttings will be removed by Tosco's disposal contractor to an appropriate disposal facility Water generated during steam cleaning will be temporarily stored in DOT-approved 55-gallon drums pending transport by Tosco's disposal contractor to an appropriate disposal or treatment facility Soil cuttings and purge water drums will be temporarily stored on-site for approximately 4 to 8 weeks • Report. A report will be prepared after completion of necessary fieldwork The report will include soil boring logs, soil and groundwater analytical results, chain-of-custody documentation, and conclusions SCHEDULE SECOR is prepared to initiate fieldwork following the approval of the work plan, receipt of off-site access agreements and well construction permits obtained from the SJCEHD A report documenting the findings of the installation of monitoring wells is I%Tosco Marketing%44091Work Plans\AddtGonal Assessment WP doc