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• <br /> i <br /> amounts of benzene & TPHg, and C-2 revealed only TPHg. Probe <br /> holes A-1, A-2 , A-5, B-2, & B-4 were below detection limits for <br /> all components . <br /> Significant levels of BTEX & TPHg were detected in the water <br /> samples from A-4 & B-3 . C-2 showed only TPHg. The water samples <br /> from probe holes A-1, A-2 , & B-2 were below detection levels . <br /> Due to lack of sand, there was no water entry from A--5 & B-4 , and <br /> no analyses could be made . <br /> The results of analyses of soil & water samples taken 1/4/1996 <br /> from probe holes D-1, D-2 , & D-3 are summarized on TABLE IV -- <br /> laboratory worksheets & chain of custody are included as EXHIBIT <br /> F. All soil samples were below detection limits, but the water <br /> sample from probe hole D-2 revealed minor levels of BETX & TPHg. <br /> CONCLUSIONS : <br /> Based upon all of the work performed to date, the following <br /> conclusions appear valid; <br /> • 1 . The extent of soil contamination has been essentially defined <br /> in all directions . A minor amout may exist beneath the shop <br /> building adjacent to where the UST was located, but it does not <br /> warrant further investigation. The highest levels of soil <br /> contamination were encountered to the north and east of the <br /> source, in the direction of the hydraulic gradient . PLATE IV <br /> shows the probable limits of the soil plume based upon work done <br /> to date . <br /> 2 . The limits of groundwater contamination have been well <br /> defined in all directions, except to the northeast . PLATES VI <br /> through X show the estimated limits of BETX & TPHg based on work <br /> done to date . The water sample from probe hole D-2 contained low <br /> levels of BETX & TPHg, indicating that it is close to the north- <br /> east edge of the plume. <br /> 3 . One additional monitoring well placed downgradient from probe <br /> holes C-2 & D-2 should be sufficient to allow full delineation of <br /> the extent of contamination at this site . Once that well has <br /> been placed and sampled, remediation techniques can be evaluated. <br /> WORKPLAN FOR PLACING ONE (1) ADDITIONAL MONITORING WELL: <br /> In order to fully evaluate the extent of groundwater contami- <br /> nation found at this site, one additional monitoring point is <br /> proposed to be placed in a downgradient position; it' s approxi- <br /> mate location is shown on PLATE XI . An encroachment permit and <br /> 9 <br />