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r • <br /> KLEINFELDER <br /> driving a Modified California Sampler, lined with three brass tubes into the undisturbed <br /> soil. The sampler will then be removed from the bottom of the boring. The bottom (third) <br /> tube will be sealed with aluminum foil and tight-fitting plastic caps. The sealed tube will <br /> immediately be stored in an iced cooler for possible chemical analysis. <br /> Samples for chemical analysis will under chain-of-custody control delivered to a laboratory <br /> certified by the Department of Health Services for the required analyses. <br /> In addition, the banks of the Mokolumne River will be visually inspected for seepage that <br /> may be leachate from the landfill. If seepage is noted, a sample from the seep will be <br /> collected in a sterile preserved bottle supplied the analytical laboratory. <br /> Qualitative Field Screening <br /> A Photovac photoionization detector (PID) will be used to provide a qualitative screening <br /> of each soil sample collected during the borings. Ile PID measures ionizable compounds <br /> in the air in parts per million by volume. Calibration is performed prior to use in the field <br /> using a standard 25 ppm benzene gas. Ambient air at the site is used to set the instrument <br /> zero. The screening procedure consists of sealing a soil sample in a clean Mason jar, <br /> allowing the sample to equilibrate for 5 to 15 minutes, and scanning the headspace of the <br /> jar for volatiles. The vapor reading is noted as the field screening result. <br /> tSoil Sample Selection for Laboratory Analysis <br /> Three to four samples from B-1 (one to two samples of the waste, one sample from the <br /> waste/soil interface, and one sample from the vadose zone below the waste) will be <br /> submitted for chemical analysis. Additionally, one sample from each of the other three <br /> borings will be submitted for chemical analysis. <br /> The selection of soil samples for laboratory analysis will be based upon: <br /> 1. Qualitative field screening performed in the field using the PID, <br /> 2. Field observations such as odor, discoloration, concentration of waste, <br /> lithologic changes, or high moisture content. <br /> 137-88-1663 5 <br />