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LEVINE•FRICKE <br /> boundary of the Site will also be screened for the presence of <br /> methane using a portable OVA. <br /> Irrigation Supply and Drainage Water <br /> Water samples will be collected at the Site irrigation influent <br /> pump inlet from 14 Mile Slough and at the irrigation drainage <br /> r discharge point to 14 Mile Slough. These water samples will be <br /> collected to evaluate the possibility that elevated concentra- <br /> tions of dissolved agricultural chemicals are present in the Site <br /> irrigation supply and/or in Site irrigation drainage water. <br /> r- <br />' Task 6: Laboratory Analysis <br /> Field Area <br /> The composited shallow soil samples collected from the field por- <br />'+ tion of the Site will be analyzed by a California-certified labo- <br /> ratory for chlorinated herbicides using EPA Method 8150, orga- <br /> nochlorine pesticides/PCBs using EPA Method 8080, and arsenic, <br /> lead and mercury using atomic adsorption methodology. Three of <br /> the field area soil samples will also be tested for organophos- <br /> phate pesticides. <br /> r_ <br /> Northeast Area <br /> r^ <br /> Soil and ground-water samples collected in the immediate vicinity <br /> of the two above-ground diesel tanks in the northeast area of the <br /> Site will be analyzed for TPH (as diesel) using modified EPA <br /> Method 8015. Soil and ground-water samples collected in the <br /> c vicinity of the removed underground gasoline tank location will <br /> be tested for TPH (as gasoline) and benzene, toluene, xylene and <br /> ethylbenzene (BTXE) . Soil samples collected at other locations <br /> within the northeast area will be analyzed for chlorinated herbi- <br /> cides using EPA Method 8150, organochlorine pesticides/PCBs using <br /> r- EPA Method 8080, and arsenic, lead and mercury using atomic <br /> adsorption methodology. <br /> r Northwest Boundary <br /> Ground-water samples collected at the northeast boundary of the <br /> Site will be analyzed for volatile organic compounds (VOCs) using <br /> EPA Method 624 , base/neutral and acid extractable compounds <br /> (BNAs) using EPA Method 625, and TPH using modified EPA Method <br /> w 8015. <br /> r- <br /> 5./1 <br />