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6.0 CONCLUSIONS <br /> ' The following conclusions and recommendations are based on the observations and <br /> analytical data collected to date Site, soil and ground water conditions not discovered or <br /> currently known may cause a change in the opinions presented in this report <br /> Laboratory analysis of ground water <br /> samples indicates the presence of significant levels <br /> ' of gasoline and gasoline constituents in water collected from monitoring well MW-1 and <br /> minor concentrations in wells MW-6, MW-8 and MW-9 All other monitoring well <br /> samples indicated non detectable levels for analyzed constituents These data are <br /> ' consistent with previous sampling event data <br /> The locations of the newly installed monitoring wells MW-7, MW-8 and MW-9 are <br /> believed to adequately define the lateral and vertical extent of ground water <br /> contamination The levels of constituents found in wells MW-8 and MW-9 are lower <br /> than the levels found within MW-6 which is considered to be at the edge of the ground <br /> ' water contaminant plume Subsequent quarterly sampling at MW-9 will confirm whether <br /> detected analytes are related to well installation methodology or representative of low <br /> level ground water contamination <br /> 1 <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 believe that the lateral and <br /> vertical extent of gasoline contaminated ground water have been adequately defined <br /> ' Monitoring wells MW-2, MW-3, MW-4 and MW-5 have indicated non detectable levels <br /> of constituents throughout their sampling history With the recent installation of <br /> upgradient well MW-7 near the former UST pit, wells MW-2 and MW-3 provide data <br /> that is not deemed significant at this point AGS recommends that approval be granted to <br /> remove these wells from the quarterly monitoring program, and that Western <br /> ' Refrigerating be allowed to make arrangements for the proper destruction of these wells <br /> in accordance with California monitoring well standards <br /> ' Monitoring wells MW-4 and MW-5 similarly provide data of minor significance to the <br /> investigation AGS recommends that MW-5 be maintained to continue to provide cross <br /> ' gradient water quality information, and it is likely to be useful in monitoring remediation <br /> ( ' <br /> CA95DE-029 American Geological Services, Inc <br /> 12 <br /> 1 <br />