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' � w <br /> E � <br />( FE <br /> CONCLUSIONS: <br /> r � <br /> ifThe 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 uupgradient in December. Levels of <br /> fi TEPH in the water (higher in the upgradient direction,) are just 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 /> to date, we continue to believe that the contamination <br /> Based upon all of the data collected <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 ver+"low risk' site, that <br /> additional work is not justified, and the site should be closed. <br /> i } <br /> IM <br /> d <br /> Aohnc: <br /> ter associates <br /> Marci <br /> RWCQB <br /> Garrison Law Corp. �0 GE <br /> '��C�R <br /> UM!J.Hl':TER <br /> orn <br /> OF CPkV,'KCa I <br /> Ey <br /> I <br /> f1[ <br /> 'f <br /> fl <br /> ' r <br /> 2 <br /> �` A <br />