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data. The plume also extends to the north & east of the site to <br /> a limited extent; with the continued mi-gration to the south, it <br /> may eventually move entirelyVe <br /> he property. <br /> 21 <br /> 3. PLATE V is a site map ofproperty showing the locations <br /> of all 7 monitoring wells, and the hydraulic gradients measured <br /> to date. The gradients have been quite consistently to the <br /> south, and match the equal concentration lines on PLATES XIT & <br /> XIII mentioned above. <br /> 4. PLATE VI is a smaller scale map of the area showing both the <br /> Canteen Corp. wells and the ones placed on the U.S. Chemical <br /> site to the south. The approximate directions of the groundwater <br /> gradients measured on both sites are indicated by small arrows, <br /> they show a significant difference in the direction of that <br /> gradient. The reason for this descrepency is unknown. A review <br /> of the data shows that depth to water at the two sites is an <br /> close agreement, which suggests both sets of wells are completed <br /> in the same stratigraphic interval . <br /> CONCLUSIQNS; <br /> Based upon an analysis of all of the data collected to date, the <br /> following conclusions appear warranted: <br /> 1 _ The "zero" line for soil contamination has been defined to <br /> the north, west, and southwest, but not to east & southeast. <br /> 2. Based upon data from monitoring wells #5, 6, & 7 , the "zero" <br /> line for benzene appears to have been fairly well located to the <br /> north & west. It has not been defined to the east & south at <br /> this time. PLATE XII shows the approximate lines of equal <br /> concentration for benzene <br /> 3. As shoran on PLATE XIII,I, the limits of TPH as gasoline have <br /> been located to the northwest; the water sample from MW-5 was <br /> below detection limits for that component. However, the plume <br /> appears to extend beyond the property boundaries to the north- <br /> east, east, and south. <br /> 4. The shape of both the benzene & gasoline plume show a north- <br /> east/southwest direction which conforms remarkably well with the <br /> hydraulic gradients as measured to date. The highest levels of <br /> contamination have shifted to the southwest away from the source, <br /> (the removed UST, ) whish indicates a fairly uniform groundwater <br /> movement. With time, it could be inferred that the plume will <br /> continue to move in a southwesterly direction, although there has <br />. not been sufficient sampling periods to verify that supposition. <br /> 13 <br />