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' 6.0 CONCLUSIONS <br /> The following conclusions and recommendations are based on the observations and <br /> ranalytical 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 /> only very low levels of ethyl benzene in MW-6. All other monitoring well samples <br /> ' indicated non detectable levels for analyzed constituents. The data indicate no changes in <br /> constituent levels in monitoring well MW-1, and a decrease in levels in MW-6 as <br /> compared with previous sampling event data. <br /> tGround water samples were analyzed for the presence of oxygenates. No detectable <br /> levels of these analytes were found in any of the analyzed wells. These data confirm the <br /> non detectable oxygenate levels found during the previous sampling event. <br /> ' 7.0 RECOMMENDATIONS <br /> ' Based upon the results of the additional soil and ground water investigation, and the <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 /> t 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 March, 1998. <br /> ' AGS recommends that a work plan be prepared, submitted and approved to conduct a <br /> remedial soil excavation at the site. <br /> ' American Geological Services, Inc. <br /> CA95DE-029 <br /> ' 15 <br /> 1 <br />