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2 . MW-2, located in a downgradient position, confirms that the <br /> contamination has moved northly, which is the indicated direction <br /> Of groundwater flow. <br /> 3 . A "zero" line has not been fully defined to the north and <br /> northeast, and there are insufficient data at this time to define <br /> the size and direction(s) of the plume . <br /> 4 . Additional spoil was removed from the site of the UST, but <br /> due to space constraints, it was not possible to remove all the <br /> contamination. Soil samples from the excavation showed low <br /> levels of gasoline compounds, but there is a possibility that <br /> some additional leaching into the groundwater may be occuring. <br /> RECOMMENDATIONS : <br /> 1 . It is recommended that quarterly sampling of wells 41 & #3 be <br /> discontinued; they have not shown any contamination since <br /> monitoring began. Quarterly water sampling should continue in <br /> well #2 until conditions change . Water level measurements should <br /> continue in all three wells to determine gradient direction; if <br /> .� major changes occur, sampling of wells #1 & #3 should be done <br /> again. <br /> 2 . Further investigative work is required to determine the <br /> lateral extent of the soil & water plume. A workplan has been <br /> approved to place several shallow small diameter soil probes in <br /> an attempt to identify "zero" lines . That work is scheduled for <br /> the week of October 30, using TEG geoprobe equipment and onsite <br /> certified portable laboratory. After that work is completed, an <br /> additional groundwater monitoring well will be placed beyond the <br /> plume . <br /> 3 . We recommend that sampling and analysis of water from MW-1 & <br /> MW-3 be discontinued. Water level data will be collected from <br /> all three wells in order to determine gradient direction. <br /> Neither of those two wells have revealed any BTEX or TPH as <br /> gas/ooeth <br /> sin e monitoring began. <br /> w <br /> Wm. n er & Associates <br /> Oct5, 1995 �(�RD Gip <br /> cc : Thayer, CVRWQCB <br /> G. Lechich WILLIHUI TER � <br /> M. Griffin ey��� <br /> 10"'rJ- <br /> N0.860 <br /> EAL�Fa4�\�' <br /> 2 <br />