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b LEVINE•FRICKE <br /> water samples were collected from the boreholes using a clean <br /> Teflon bailer. <br /> This methodology is a reconnaissance mettilod designed to indicate <br /> the possible presence of analytes in water samples collected, but <br /> does not necessarily produce quantitative results. Quantitative <br /> results upon which to base interpretations would require instal- <br /> lation, development and sampling of ground-water monitoring wells <br /> to obtain representative ground-water samples. <br /> 9.4 Irrigation Supply and Drainage Wateriii <br /> Water samples were collected from Fourteenmil'e Slough at the Site <br /> irrigation influent pump inlet and at the; irrigation drainage <br /> discharge point to 'Fourteenmile "Slough. Phes'e samples were <br /> collected to evaluate the possibility that elevated concen- <br /> trations of dissolved pesticides chemical 1s are present in the <br /> ! Site irrigation supply and/or in Site irrigation drainage water. <br /> 9.5 Power Transmission Line Easement <br /> I� <br /> A total of 16 shallow soil samples were c olle''cted at one and <br /> three foot depths at eight locations along the power transmission <br /> line easement located along the southern border of the Site. <br /> The purpose of these samples was to assess the possible presence <br /> of chlorinated herbicides associated witti3. weed control measures <br /> within the power line easement. The laboratory was requested to <br /> composite all of the samples collected atlthe'tone-foot depth into <br /> one sample for chemical analysis, and hold the samples collected <br /> at three feet below grade. Portions of thei;ndividual samples <br /> collected at the one-foot depth were also, held by the laboratory. <br /> �l <br /> 10.4 CHEMICAL ANALYSIS i3 <br /> 4 <br /> Samples collected in the field program outlined above were <br /> analyzed by Med-Tox Associates of Pleasant Hill, California, a <br /> State-certified laboratory, as described below. A summary of the <br /> laboratory analyses conducted is presented iniTable 1. With <br /> respect to pesticides, chemical analysis was focused on the <br /> classes of compounds commonly used that are the most persistent <br /> in the environment: chlorinated pesticide's and herbicides, and <br /> metals. The metals selected for analysis are those of greater <br /> human toxicity that have been used in pesticide formulations <br /> (i.e. arsenic, lead, and mercury) . Analysis ,of three composite <br /> samples was also performed for organophosphate pesticides which, <br /> although generally not highly persistent1jin soils as a class, <br /> have been reported to have been used at the Site (i.e. , Diazinon) <br /> and at the nearby Brookside Ranch. ', <br />