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FUGRO WEST, INC. STANDARD OPERATING PROCEDURES RE. SOIL BORING SAMPLING SOP-1 During drilling, soil samples for chemical analysis are collected in thin-walled brass tubes rof 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 ' using a 140-pound drop hammer The sampler is extractea 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 aelivery, 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 analvzed ,n the field using either a portable photoconization aetector (PID), flame ionization detector organic vapor analyzer, catalytic gas detector or an expiosimeter The purpose of this field analysts is to qualitatively aetermine the presence or absence of hydrocarbons, and the samples to be analyzed at the iaboratory The soil sample is sealed in ether 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 container heaasoace The data is recorded on both field notes and the boring logs at the depth corresponding to the sampling point ' r soil sam les are collected to document the soil and/or stratigraphic Other hic profile beneath p 9 P the project site and estimate the relative permeability of the subsurface materials All drilling and samolmg equipment are either steam cieanea or washed in solution and doubly rinsed in dejonized 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 nolidays), the samples are temporarily storea until the first opportunity for submittal, either on ice in a cooler such as when in the field or in a refrigerator at Fugro's office -TTACHMEWI,9011 11APRl4 ---4