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monitoring well placement operations revealed the presence of <br /> BTEX & TPA-G in the vadose zone below recent high groundwater <br /> levels, and below the current water table. <br /> 2) BTEX & TPH-G was found in water samples taken from the four <br /> groundwater monitoring wells recently completed on the property <br /> The levels measured are not in agreement with the hydraulic <br /> gradient as determined from the recent work, but there is not <br /> sufficient data available at this time to determine the reason <br /> for the anomaly. <br /> 3) Further site assessment work, {ie, additional bore holes or <br /> monitoring wells, ) is not advisable at this time, due to lack of <br /> sufficient data concerning hydraulic gradients and levels of <br /> contamination <br /> BECOMMENDATION5 <br /> The source of the contamination, the 10,000 gallon UST, has been <br /> removed, and a major portion of the impacted soil has been exca- <br /> vated and properly disposed of. It is believed that further <br /> • investigative work should be deferred until additional data has <br /> been collected and analyzed concerning hydraulic gradient <br /> directions and groundwater contamination levels. <br /> Therefore, it is recommended that quarterly measurement of the <br /> hydraulic gradient and sampling of the groundwater be conducted <br /> for a sufficent period of time to allow a more accurate deter - <br /> mination of w at additional assessment work, if any, is required <br /> u <br /> Wm_ J t r & Associates <br /> Augu t 1993 <br /> cc: Marc Paschini \S -QED 0r�lpG, <br /> J. P. Cunningham <br /> W{k.IJ I FiiJt�Eff� <br /> ND.86D <br /> sr9�0F CAL1Fo�P <br /> 16 <br />