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n 4 iy <br /> F <br />�r <br /> AEGIS ENVIRONMENTAL, INC. <br /> " STANDARD OPERATING PROCEDURES <br /> RE: SOIL BORING SAMPLING <br /> SOP-1 <br /> Soil samples for chemical analysis are collected in thin-walled brass tubes,4-or 5-inches <br /> long by 2-inches outside diameter. Three or four of the tubes, plus a spacer tube, are <br /> set in a 2-inch inside diameter 18-inch split-barrel sampler. <br /> Where possible, the split-barrel sampler is driven its entire length either hydraulically or <br /> using a 144-pound drop hammer. The sampler is extracted from the borehole and the <br /> brass tubes, containing the soil samples, are removed. Upon removal from the sampler— <br /> the <br /> am ler,the selected brass tubes are immediately trimmed and capped with either u inum fo: <br /> �0or Teflon sheets and plastic caps. They are then hermetically sealed wit ap <br /> 'iolabeled and refrigerated for delivery, under strict chain-of-custody, to the;,a a ical <br /> laboratory. These procedures minimize the potential for cross-contamination and <br /> volatilization of volatile organic compounds (VOC) prior to chemical analysis. <br /> One soil sample collected at each sampling interval is analyzed in the field using either <br /> a portable photoionization detector (PID), flame ionization detector, organic vapor <br /> analyzer, catalytic gas detector or an explosimeter. The purpose of this field analysis is <br /> to qualitatively determine the presence or absence of hydrocarbons, and the samples to <br /> be analyzed at the laboratory. The soil sample is sealed in either a brass tube, glass jar <br /> or plastic bag to allow for some volatilization of VOC. The PID is then used to measure <br /> the concentrations of hydrocarbons within the containers`s head space. The data is <br /> recorded on both field notes and the boring logs at the depth corresponding to the <br /> sampling point. <br /> Other soil samples are collected to document the soil and/or stratigraphic profile beneath <br /> the project site, and estimate the relative permeability of the subsurface materials. All <br /> drilling and sampling equipment are either steam-cleaned or washed in trisodium <br /> phosphate solution and double-rinsed in deionized water prior to use at each site and <br /> between boreholes to minimize the potential for cross-contamination. <br /> . - ATTACHMENT/50P-1/June 1990 _ - - <br />