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r <br /> ' 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 samples indicates the presence of moderate levels of <br /> gasoline and gasoline constituents in water collected from monitoring well MW-1 and <br /> 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 /> 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 /> AGS recommends continued quarterly monitoring of the six monitoring wells sampled <br /> during this event to assess ground water quality over time. The next regularly scheduled <br /> '. quarterly sampling event will take place in September, 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 /> ' 8.0 SIGNATURES AND CERTIFICATION <br /> This project was performed by American Geological Services, Inc. in accordance with <br /> ' accepted geologic and hydrologic standards of the State of California in effect at the time <br /> of this investigation. Additional work or sampling at this site may generate data that <br /> ' could lead to a change of opinion regarding site conditions. Consequently, no warranty is <br /> made, either expressed or implied, with respect to the geologic, hydrologic or chemical <br /> conditions beneath the Tracy Cold Storage site. <br /> 1 <br /> 1 <br /> rAmerican Geological Services, Inc. <br /> CA95DE-029 <br /> ' 13 <br /> 1 <br />