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y + n Wi STANDARD OPEPAT VG PROCEDURES RE:SOIL SAMPLING SOP-2 .fail samples for chemical analysis are collected in thin-walled brass tubes,4-inches long by 2-inches a outside diameter. Four of these tubes and a spacer tube are set in a 24nch inside diameter 18-inch split-barrel sampler. The split-barrel sampler is driven its entire length either hydraulically or using a 144-pound drop hammer. The sampler is extracted from the borehole and the brass tubes, containing the soil samples,are removed. Upon removal from the sampler,the selected brass tubes are immediately �9 trimmed and capped with aluminum foil and plastic caps. They are then hermetically sealed with duct tape,labeled and refrigerated for delivery,under chain-of-custody,to the analytic laboratory. Thew procedures minimize the potential for cross-contamination and volatilization of volatile organic compounds(VOC)prior to chemical analysis. One soil sample collected at each sampling interval is analyzed in the field using either a photoionizadan detector(PID),a flame ionization detector(PID),or an explosimeter.The purpose of this field analysis is to qualitatively determine the presence or absence,of hydrocarbons and to establish which soil samples will be analyzed at the laboratory. The soil sample is sealed in a to enhance volatilization of the hydrocarbons 6om the zEp!:xck plastic bag and placed in the sun logs at the depth corresponding to the sampling point. sample. The data is recorded on the drill Other sail samples are collected to document the stratigraphy and estimate relative permeability of the subsurface materials. All drilling and sampling equipment are steam-cleaned prior to use at -contamination. ,� tib! each site and between boreholes to minimize the potential for cross i i� S 9y T� n� y j