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i <br /> CONCLUSIONS: <br /> The reason for the large increase in diesel components identified in the groundwater from <br /> this latest event is not fully understood Based on measured data, MW-4 was in a down- <br /> gradient position during the September sampling, but upgradient in December Levels of <br /> TEPH in the water {higher in the upgradient direction,) are dust the opposite of what <br /> should be expected We believe the aquifer has very low transmissivity, and is of limited <br /> lateral extent It has been fully demonstrated that the gradient is extremely divergent <br /> Therefore, fluid movement in the aquifer will be very slow to adjust to changes in hydrau- <br /> lic gradient This is the most likely reason for the change in levels of concentrations as <br /> measured by the two events <br /> Based upon all of the data collected to date, we continue to believe that the contamination <br /> encountered beneath this site is not in communication with other aquifers, and that further <br /> work is not warranted <br /> RECOMMENDATION: <br /> • As we have repeatedly stated in prior reports, we believe this is a vM"low risk" site, that <br /> additional work is not justified, and the site should be closed <br /> teri& ssociates n Marc <br /> RWCQB <br /> Garrison Law Corp <br /> <0 <br /> 61 <br /> li AM J HL TER <br /> Gwr oeec ///97 <br /> NO PC 1 <br /> VJ.I ,a <br /> OF NOT <br /> 2 <br />