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AEGIS ENVIRONMENTAL, INC. ' STANDARD OPERATING PROCEDURES RE. SOIL BORING SAMPLING SOP-1 During drilling, soil samples for chemical analysis are collected in thin-walled brass tubes, I of varying diameters and lengths (e g , 4 or 6 inches long by 2 inches outside-diameter) Three or four of the selected tubes, plus a spacer tube, are set in an 18-inch long split- barrel sampler of the appropriate inside-diameter Where possible, the split-barrel sampler is driven its entire length either hydraulically or Y Y using a 140-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 either immediately trimmed and capped with aluminum foil or Teflon sheets and plastic caps or the samples are extruded from the tubes and sealed within other appropriate cleaned sample containers (e g , glass far) The samples are then hermetically sealed, labeled, and refrigerated for delivery, under strict chain-of- custody, to the analytical laboratory These 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 portable photoionization detector (PID), flame ionization detector, organic vapor analyzer, catalytic gas detector or an explosimeter The purpose of this field analysis is to qualitatively determine the presence or absence of hydrocarbons, and the samples to be analyzed at the laboratory The soil sample is sealed in either a brass tube, glass Jar or plastic bag to allow for some volatilization of VOC The PID is then used to measure the concentrations of hydrocarbons within the containers's headspace The data is recorded on both field notes and the boring logs at the depth corresponding to the sampling point Other soil samples are collected to document the soil and/or stratcgraphic profile beneath I the project site, and estimate the relative permeability of the subsurface materials All drilling and sampling equipment are either steam-cleaned or washed ,n solution and double-rinsed in deionized water prior to use at each site and between boreholes to Eminimize the potential for cross-contamination E EATTACHMENT/SOP 1/FEBRUARY 1992