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AEGIS ENVIRONMENTAL, INC. <br /> is STANDARD OPERATING PROCEDURES <br /> RE: SOIL SAMPLING <br /> �. SOP-2 <br /> Soil samples for chemical analysis are collected in thin-walled <br /> brass tubes, 4- or 6-inches long by 2-inches outside diameter. <br /> Three or four of the tubes, plus a spacer tube, are set in a 2-inch <br /> inside diameter 18-inch split-barrel sampler. <br /> Where possible, the split-barrel sampler is driven its entire <br /> length either hydraulically or using a 140-pound drop hammer. The <br /> sampler is extracted from the borehole and the brass tubes, <br /> containing the soil samples, are removed. Upon removal from the <br /> sampler, the selected brass tubes are immediately trimmed and <br /> capped with Teflon sheets and plastic caps. They are then <br /> hermetically sealed with duct tape, labeled and refrigerated for <br /> delivery, under strict chain-of-custody, to the analytical <br /> laboratory. These procedures minimize the potential for cross- , <br /> A contamination and volatilization of volatile organic compounds <br /> (VOC) prior to chemical analysis. <br /> One soil sample collected at each sampling interval is analyzed in <br /> the field using either a portable photoionization detector (PID) , <br /> flame ionization detector, organic vapor analyzer, catalytic gas <br /> detector or an explosimeter. The purpose of this field analysis is <br /> to qualitatively determine the presence or absence of hydrocarbons, <br /> and the samples to be analyzed at the laboratory. The soil sample : <br /> F„t is sealed in a glass jar, sealed with aluminum foil, to allow for <br /> some volatilization of VOC. The PID is then used to measure the <br /> concentrations of hydrocarbons within the jar's head space. The <br /> data is recorded on both field notes and the boring logs at the <br /> depth corresponding to the sampling point. <br /> Other soil samples are collected to document the soil and/or <br /> stratigraphic profile beneath the project site, and estimate the <br /> �. relative permeability of the subsurface materials. All drilling <br /> and sampling equipment are either steam-cleaned or washed in <br /> trisadium phosphate solution and double-rinsed in deionized water <br /> prior to use at each site and between boreholes to minimize the <br /> potential for cross-contamination. <br /> sop-7/oct. 1990 <br />