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1 <br /> 11/13/1996 sampling event They show that the highest levels of <br />' all tested compounds were measured in MW-3, supporting the prior <br /> work which revealed that the area next to the pump inland had <br /> very high levels of contamination in the soil in Boring "B" . <br />' The reduction an concentrations of BTEX between July & November <br /> suggests that natural attenuation may be occurring, since the <br /> data collected to date indicates that the plume as relatively <br />' stable, and has not migrated far from the source {s } <br /> CONCLUSIONS <br />' 1 The dispenser pumps & product lanes appear to have been the <br /> major contributor of the contamination on the property, although <br /> the UST' s may have been a minor source <br />' 2 Although the limits of the plume have not been fully defined, <br /> there is no evidence of an offsite source Additional investiga- <br /> tive work to locate the 'zero" line as not justified at this <br /> time <br /> 3 Although natural attenuation appears to be taking place, the <br /> reduction in levels of BTEX between the July & November samplings <br /> may be due an part to the drop in the water table <br />' RECOMMENDATIONS <br /> We recommend that quarterly monitoring continue to allow a more <br />' accurate evaluation of the site If the reduction in levels of <br /> contamination continue, and the plume remains essentially stable, <br /> it may be possible to close the site without additional work <br /> Proposals for site remediation, if such work is necessary, should <br />' be deferred until sufficient data has been collected to allow the <br /> design of an efficient, cost-effective cleanup system <br />' WESValentine <br /> unter & Associates (7 GE <br /> c �S Gys <br /> RWQCB <br /> li'NER <br /> 4CsT � �- <br /> aF cc� ° <br /> 2 <br /> I <br />