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WEISS ASSOCL47ES P"o <br /> 3.2 SOIL SAMPLING METHODOLOGY <br /> Samples are collected with a 2-in. ID split-barrel sampler containing 4-inch-long <br /> steam-cleaned brass tubes. The sampler is washed with soapy water between samples and <br /> is steam-cleaned between boreholes. After the deepest two tubes are removed from the <br /> sampler they are immediately trimmed, sealed with aluminum foil or teflon capliners, <br /> plastic caps and tape, labeled and refrigerated until delivery to the analytical laboratory. <br /> This procedure minimizes the potential for cross-contamination, moisture loss, and <br /> volatilization of volatile organic compounds (VOCs) prior to chemical analysis. In <br /> addition, one soil core from the split-tube sampler is used to determine soil lithology and <br /> is screened in the field with an organic vapor analyzer (OVA) to qualitatively determine <br /> the presence or absence of VOCs. <br /> The top of the sample is indicated with a "T" marked on top of the tube cap. Soil <br /> samples collected for chemical analyses are labeled as follows: <br /> Company name (Weiss Associates) <br /> Borehole number <br /> Depth <br /> Date <br /> WA Project Number <br /> Instructions to tab, if appropriate, regarding where to take sample for analysis <br /> (i.e. middle of tube, sand at one end, etc.) <br /> 3.3 EQUIPMENT DECONTAMINATION AND DISPOSAL OF CONTAMINATED <br /> MATERIALS <br /> All drilling equipment coming into contact with the boreholes. will be steam-cleaned <br /> prior to drilling. <br /> WPIF:\ALL\331DWG\331R1AP8.1)OC:74-331-00:V1.035 Page 15 <br />