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• <br /> TABLE 3 <br /> Monitoring Well Water Elevations - December 18, 1998 <br /> Well Well Collar Depth to Water Ground Water <br /> Number Elevation (feet) Elevation (feet) <br /> (feet) <br /> MW-5 57.86' 12.01' 45.85' <br /> MW-6 57.27' 11.52' 45.75' <br /> M�W�"y7 56.15' 9.90, 46.25' <br /> NOTE: Shaded cells indicate wells not used in gradient calculation. <br /> I! <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 reduced levels of <br /> ' gasoline and gasoline constituents in water collected from monitoring well MW-1A and <br /> low to non detectable levels in MW-6. The constituent levels obtained from monitoring <br /> well MW-lA indicate the continuation of a substantial decline when compared with the <br /> levels obtained prior to the remedial excavation. This decline is illustrated on Graph 1. <br /> Slight increases in MW-6 constituent levels were observed during this sampling event but <br /> are not deemed significant. <br /> All other monitoring and domestic water supply well samples indicated non detectable <br /> levels for all analyzed constituents. The ground water data support the conclusion that <br /> the vertical extent of contamination has not extended beyond the depth of 18 feet below <br /> grade as indicated during the remedial soil excavation. The two domestic water supply <br /> ' wells, and monitoring well MW-9 have not been impacted. <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 a modification to <br /> the existing ground water monitoring program is warranted. <br /> CA95DE-029 American Geological Services, Inc. <br /> 10 <br />