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lie Based on the range and levels of the analytes detected in the two wells it does not g Y appear <br /> that the distilled water contributed to the ground water contaminant levels. <br /> ' 6.0 CONCLUSIONS <br /> ' The following conclusions and recommendations are based on the observations and <br /> analytical data collected to date. <br /> Laboratory analysis of ground water samples indicates the presence of moderate levels of <br /> gasoline and gasoline constituents in water collected from monitoring well MW-1 and <br /> t low levels in MW-6. All other monitoring well samples indicated non detectable levels <br /> for analyzed constituents. The data indicate a slight increase in constituent levels in <br /> monitoring wells MW-1 and MW-6 as compared with previous sampling event data. The <br /> ' slight changes observed during this sampling event are not deemed significant. <br /> Ground water samples were analyzed for the presence of oxygenates. No detectable <br /> ' levels of these analytes were found in any of the analyzed wells. <br /> 7.0 RECOMMENDATIONS <br /> Based upon the results of the additional soil and round water investigation, and the <br /> P g g , <br /> '• results obtained from this quarterly sampling event, AGS believes that the lateral and <br /> vertical extent of gasoline contaminated ground water have been adequately defined. <br /> ' AGS recommends continued quarterly monitoring of the five monitoring wells sampled <br /> during this event to assess ground water quality over time. AGS does not recommend the <br /> recovery of the monitoring well MW-8 at this time. Historical analytical data indicate <br /> ' non detectable levels of all analyzed constituents over the five previous sampling events <br /> at this well. <br /> Based on the laboratory results obtained for the oxygenates analyses, AGS recommends <br /> that these analyses be suspended for future sampling events. The next regularly <br /> scheduled quarterly sampling event will take place in December, 1997. <br /> A work plan has been submitted and approved to conduct a remedial soil excavation at <br /> the site in the spring of 1998. <br /> 1 <br /> American Geological Services,Inc. <br /> ' CA95DE-029 <br /> 14 <br /> t' <br />