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TPH - Total Petroleum Hydrocarbon <br /> ND - Not Detected <br /> NA - Not Analyzed <br /> WATER ANALYSES <br /> After installation of the two groundwater wells, each was developed by bailing On April 23, <br /> 1994, each of the monitoring wells at the site was purged and sampled Purging continued until <br /> pH, temperature and conductivity parameters stabilized. Groundwater samples were obtained <br /> with a teflon bailer and were containerized in 40 ml VOA vials The samples were immediately <br /> placed on ice pending shipment to the laboratory Each sample was tested for TPH and BTEX <br /> by EPA method 8015/8020 by Smith-Emery Laboratories <br /> Results of analysis show that well MW2 has the highest concentration of dissolved TPH and <br /> benzene This well is located adjacent to the tanks and has consistently contained the highest <br /> contaminant concentrations New well MW8 had the second highest dissolved concentration, <br /> which is somewhat surprising since it is not located near the underground tanks or pump islands <br /> Downgradient well MW7 contained 830 ug/l benzene Interestingly, well MW4, which is <br /> located between wells MW7 and MW8 near the south side of the site, had less than detectable <br /> TPH and BTEX concentrations This well has consistently shown very low or less than <br /> detectable levels, and it was expected that wells MW7 and MW8 would also have relatively low <br /> concentrations These results and data from previous sampling events are shown on Table 2 <br /> The distribution of benzene beneath the site is shown on Figure 5 The laboratory data is <br /> presented in Appendix E with chain of custody and method detection limits <br /> Page 8 <br />