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EXECUTIVE SUMMARY <br /> The depth to groundwater was measured and water samples were collected from the Gillies <br /> Trucking site on December 22, 1999 Eight water samples were sent to McCambell Analytical <br /> Laboratories for analysis of Total Petroleum Hydrocarbons in the diesel range, and seven samples <br /> were also analyzed for Total Petroleum Hydrocarbons in the gasoline range and for BTEX <br /> Groundwater is present at a depth of 53 feet(approximately two feet shallower than when measured <br /> in October 1999) The groundwater gradient is to the east at this time, and appears to be steeper <br /> west of the UST cavity than east of it The east-trending trough in the gradient has reappeared, <br /> although it may trend slightly more to the southeast than previously The site continues to <br /> experience changes in groundwater gradient and flow direction, making interpretation of the <br /> hydrogeology and contaminant distribution difficult <br /> Diesel was detected in five of eight wells, at concentrations ranging from 66 µg/l (ppb) to 55,000 <br /> ppb Gasoline was detected in one sample at 750 ppb, and benzene was reported in four samples <br /> between 0 8 and 13 ppb MTBE was reported only in GT-10, at a concentration of 9 4 ppb <br /> 1 <br />