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ATTACHMENT B FIELD AND LABORATORY PROCEDURES Chevron 9-8632, 575 Grant Line Road, Tracy, CA in the deep borings . A grade of sand appropriate to the screen size will be placed in the annular space across the entire screened interval, and will extend approximately 2 feet above the top of the screen for each well . A bentonite seal will extend one to two feet above the sand pack. The monitoring wells will be completed with neat cement from the bentonite seal to ground surface. The well casings will be topped with a locking cap . The well heads will be contained in watertight well boxes, either traffic rated and flush mounted or in a "stove-pipe" arrangement. The boring logs will show well construction details. The wells will be developed after completion by pumping or bailing water from each well until the water is visibly clear, the wells go dry, or until a maximum of ten casing volumes have been removed. Soil Sampling for Stockpiled Soil Soil samples will be 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 will be collected per approximately 100 cubic yards of soil. Soil samples for chemical analysis will be retained in the brass liners, labeled, and capped with Teflon sheets and plastic end caps. The samples will then be 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 will be 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 terkiary-butyl ether, 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 will be temporarily stored onsite and covered with plastic sheeting pending characterization and disposal. Soil cuttings will be removed by Chevron'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 Chevron' s disposal contractor to an appropriate disposal or treatment facility. Soil cuttings and rinsate water drums will be temporarily stored onsite for approximately 4 to 8 weeks.