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ATTACHMENT B FIELD AND LABORATORY PROCEDURES Chevron 9-8632, 575 Grant Line Road, Tracy, CA • mately 15 feet of screen was placed in the bottom the shallow borings, and 5 feet of screen in the deep borings A grade of sand appropriate to the screen size was placed in the annular space across the entire screened interval, and extends approximately 2 feet above the top of the screen for each well A bentonite seal extends one to two feet above the sand pack The monitoring wells were completed with neat cement from the bentonite seal to ground surface The well casings were topped with a locking cap and the well heads are contained in watertight, traffic rated well boxes The boring logs show well construction details The wells were developed by GettIer-Ryan (G-R) as part of the second quarter 2002 monitonng and sampling event Soil Sampling for Stockpiled Soil Soil samples were collected by advancing a 2-inch diameter brass sample liner into the soil stockpile, after removing approximately 6-inches to 1-foot of surface material in the sample location One composite sample was collected per approximately 100 cubic yards of soil Soil samples for chemical analysis was retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps The samples were then sealed in zip-lock bags, placed on ice, and transported to the laboratory accompanied by the appropriate chain-of-custody documentation Laboratory Procedures for Soil and Groundwater Samples Selected soil and groundwater samples were analyzed for the presence of total petroleum hydrocarbons quantified as gasoline (TPHg), total petroleum hydrocarbons quantified as diesel (TPHd), and methanol using modified EPA Method 8015, and benzene, toluene, ethylbenzene, xylenes (BTEX), methyl tertiary butyl ether (MtBE), tertiary butanol (TBA), di- isopropyl ether (DIPE), ethyl tertiary-butyl ether (EtBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), 1,2-dibromoethane (EDB), and ethanol by EPA Method 8260 Soil Cuttings and Rinsate Water Soil cuttings generated during drilling operations were temporarily stored onsite and covered with plastic sheeting pending characterization and disposal Soil cuttings were removed by Chevron's disposal contractor to an appropriate disposal facility Water generated dunng steam cleaning was temporarily stored in DOT-approved 55-gallon drums pending transport by Chevron's disposal contractor to an appropriate disposal or treatment facility