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2.0 Collection of Samples <br /> 2.1 Soil Samples <br /> Soil samples are subjected to field analysis with either a flame ionization detector(FID) <br /> or a photoionization detector(PID)with a 10.7 EV lamp immediately following sample <br /> collection. The field analysis is performed as follows: <br /> 1. A representative aliquot of the sample is placed in a glass jar or resealable freezer <br /> bag and broken up (to the extent possible)to allow the release of contaminant <br /> vapors. <br /> 2. The container is exposed to direct sunlight for a period of ten minutes to facilitate <br /> the volatilization of organic compounds within the sample. <br /> 3. The probe of the FID or PID is inserted into the container carefully and a sample of <br /> the vapor is drawn into the instrument. The maximum numerical reading observed <br /> is noted on the drilling log. <br /> All soil samples to be submitted for laboratory analysis are collected with a California <br /> modified split spoon sampler fitted with brass tubes. The ends of the brass tubes are covered <br /> with Teflon'"'tape and fitted with airtight caps. The selection of samples to be submitted for <br /> laboratory analysis will be based on field observations and headspace analysis. <br /> 2.2 Groundwater Samples <br /> The following summarizes Versar's protocol for collecting grab groundwater samples: <br /> 1) Measure the water level in the boring using a decontaminated electronic measuring <br /> device. The measurements are made to the nearest 0.01 foot and measured relative <br /> to the top of the boring. <br /> 2) Inspect the dedicated, 1.5-inch diameter bailer to ensure that the bottom check <br /> valve assembly is working correctly. <br /> 3) Insert the bailer into the boring and carefully lower the bailer to avoid agitating and <br /> aerating the fluid column. <br /> 4) Slowly withdraw the bailer and place the contents into the appropriate containers. <br /> III-2 <br />