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groundwater. These wells can also be used, if required, to monitor the status <br /> of the free oil plume through time. Samples will be collected and analyzed for <br /> organic compounds using EPA Method 602. <br /> Well Sampling and Chemical Analyses <br /> After completion and development of the three new wells, groundwater samples <br /> will be collected. These samples will be analyzed for organic compounds using <br /> EPA Method 602. These analyses will indicate the groundwater quality imme- <br /> diately outside the free oil plume. <br /> z <br /> The following sampling procedure will be used: <br /> L <br /> 0 4-10 casing volumes of water will be removed from the well by .pumping <br /> with a centrifugal pump using new dedicated PVC hose. If the water <br /> table is too low to permit pumping, the wells will be bailed with a <br /> i� clean PVC bailer; <br /> o Samples will be obtained with a clean teflon bailer. To minimize the <br /> possibility of cross-contamination between wells, the bailer will be <br /> carefully cleaned between wells with a trisodium phosphate solution, <br /> rinsed with fresh water, and rinsed finally with distilled water. <br /> o Records of water samples will be maintained on standard Dames & Moore <br /> formatted record sheets (Plate 11). pH and specific conductance will <br /> be measured in the field during sampling. <br /> Immediately after collection, samples will be stored on ice and shipped to <br /> ?, California Water Labs of Modesto, California for analysis using EPA Method 602. <br /> ti One blind duplicate will also be submitted for quality control purposes. <br /> Standard chain-of-custody documentation will be followed. <br /> z� <br /> In the event that any organic compounds are detected in the analyses , the <br /> s� actual chromatograms will be inspected by an chemist independent of the lab <br /> thoroughly familar with the testing procedure. <br /> E <br /> k _ <br /> JED2/H -12- <br /> r�' <br />