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�FUGRO WEST, INC. <br /> STANDARD OPERATING PROCEDURES <br /> RE: SOIL BORING SAMPLING <br /> SOP-1 <br /> During drilling with a hollow-stem auger or air-rotary rig, soil samples are typically collected in thin-walled <br /> brass or stainless steel tubes 6 inches long by 2 inches outside diameter Three of the tubes are set, typically, <br /> in an 18-inch-long split-barrel sampler The sampler is usually lowered into the open borehole attached either <br /> to the end of drilling pipe or on a wire-line hammer device <br /> When possible,the split-barrel sampler is driven its entire length, either hydraulically or by repeatedly pounding <br /> a 140-pound hammer using a 30-inch drop The number of drops (blows) used to drive the sampler is recorded <br /> on the boring log The sampler is extracted from the borehole and the tubes containing the soil samples are <br /> removed Upon removal from the sampler, the ends of the lowermost tube are typically covered with aluminum <br /> foil or "Teflon" sheets and plastic caps The sample may be extruded from the tube and sealed within another <br /> appropriate cleaned sample container (e g , glass jar) The sealed sample is labeled and refrigerated for delivery, <br /> under strict chain-of-custody, to the analytical laboratory These procedures minimize the potential for cross- <br /> contamination and volatilization of volatile organic compounds (VOC) prior to chemical analysis <br /> Material from one of the other tubes is analyzed in the field, when required, using either a portable <br /> photoionization detector (PID) or equivalent analytical instrument The purpose of this field analysis is to <br /> qualitatively determine the presence or absence of hydrocarbons The soil sample is enclosed in a container (eg , <br /> plastic bag) to allow for some volatilization of VOC The PID is then used to measure the concentrations of <br /> hydrocarbons within the container headspace The data is recorded on the boring logs at the depth <br /> corresponding to the sampling point <br /> Any remaining soil collected from the sampler at that interval is described geologically using the USCS or other <br /> appropriate classification system) on a boring log All drilling and sampling equipment are either steam-cleaned <br /> or washed prior to use at each site and between boreholes to minimize the potential for cross-contamination <br /> Sampling equipment is also cleaned between samples <br /> Fugro West Inc <br /> SOP-110aober 1994 <br /> I � <br /> k <br />