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i <br /> while the one from the west wall was generally in between Both <br /> ' bottom samples, which are below the capillary fringe, revealed <br /> similar amounts of all tested components. <br /> CONCLUSIONS: <br /> ' 1 Measureable levels of BTEX & TPH as gasoline exist in the <br /> soil below and surrounding the site of the removed UST' s. <br /> ' 2. Groundwater has been impacted by leakage from those removed <br /> tanks, and further investigative work will be required to <br /> ' delineate the plume. <br /> 3. Due to space constraints, additional excavation does not <br /> appear to feasible, methods for cleanup of the remaining <br /> contaminated soil will be evaluated after the completion of a <br /> soil and groundwater investigation <br /> ' RECOMMENDATION: <br /> Based upon an analysis of all of the data obtained to date, it <br /> does not appear that further excavation is warranted at this <br /> time The site of the removed UST' s has been filled with clean , <br /> pea gravel, and covered with asphalt. Due to the fact that <br /> petroleum constituents were detected in soil samples at & below <br /> ' the capillary fringe, additional investigative work will be <br /> required. <br /> ' It is recommended that one (1) groundwater monitoring well be <br /> placed in a downgradient position from site of the removed tanks, <br /> the regional gradient in this area is to the east--northeast. <br /> Depending upon the results of that investigation, additional work <br /> ' may be necessary to fully define the extent of soil and ground- <br /> water contamination. A workplan for placing that well can begin <br /> shortly after review and comment from the San Joaquin County EHD <br /> ' oft ' s erzm report. <br /> ' Wm. nter & Associates <br /> Ja ua 3, 1995 D Gt <br /> cc alley Wholesale Drugs <br /> ' WU M j fii1NTER <br /> * NO 850 <br /> sr �� <br /> A'F of <br /> 6 <br /> I <br />