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. EXECUTIVE SUMMARY <br /> Groundwater samples were collected from five monitor wells and one domestic well at the Gillies <br /> Trucking yard at 3931 Newton Road on June 5, 2003 One well was dry and was not sampled <br /> The static water level fell by nearly 1 foot since March and was 60 feet below grade on June 5 At <br /> this depth it remains wrtlun the silt and clay of the Modesto aquitard, below the Modesto channel <br /> aquifer and below the bottom of well GT-10 (59 45 feet) <br /> The water elevation data were contoured to yield a map of the piezometric surface The elevation <br /> contours form an arc around well GT-1, and the water table slopes eastward or southward This is <br /> unchanged from the previous quarter <br /> The water samples were analyzed for TPH-diesel, which was detected in three samples The <br /> concentration increased from 120 to 150 ppb in GT-5, decreased from 540 to 420 ppb in GT-6 and <br /> from 83 to less than 50 ppb in GT-1, and was unchanged at 61 ppb in GT-9 The concentration also <br /> remained below the detection limit in GT-3 and in the Gillies domestic well Thus, groundwater <br /> contamination in the aqurtard is below or only a few hundred parts per billion above the diesel <br /> detection limit in all wells <br /> 1 <br /> 1 <br />