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6 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, 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 ether hydraulically or 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 jar) 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 I 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 lar, or plastic bag to allow for some volatilization of VOC. The PID ,s 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 stratigraphic profile beneath the project site, and estimate the relative permeability of the subsurface materials All drilling and sampling equipment are ether steam cleaned or washed in solution and doubly rinsed in deionized water prior to use at each site and between boreholes to minimize the potential for cross -contamination In the event the soil samples cannot be submitted to the analytical laboratory on the same day they are collected (e.g , due to weekends or holidays), the samples are temporarily stored until the first opportunity for submittal ether on ice in a cooler, such as when in the field, or in a refrigerator at Aegis' office AT7ACHMENT/S0P-1/5E3TEM6ER 1992