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20 October 2003 <br /> AGE-NC Project No 95-0185 <br /> Page 4 of 6 <br /> Ma�2003 <br /> Ground water elevation ranged from 35 15 feet(MW-1)to 35 79 feet(MW-5) above mean sea level <br /> (msl) The groundwater was inferred to flow generally northeast at the former UST area at a gradient <br /> of 0 002 ft/ft, and west-southwest at a gradient of 0 008 ft/ft in the area encompassed by wells <br /> MW-2, MW-3 and MW-5 <br /> June 2003 <br /> During the June 2003 sampling event, the depths to ground water at wells MW-1 (25 75 feet) and <br /> MW-4(25 60 feet)were affected by the presence of free product, the depths were recalculated to be <br /> 25 24 feet and 25 15 feet,respectively,utilizing the measured thickness of free product in the wells <br /> D,= DR, - (tg d�d j <br /> D,u= Corrected depth to water <br /> D,,,=Measured depth to water <br /> t8=Total thickness of free product <br /> dg =Density of free product(diesel at—0 88 g/ml) <br /> d,, =Density of water(-1 0 gm/ml) <br />' Ground water elevation data collected in June from wells MW-1 through MW-5 inferred a general <br /> ground water flow towards the northeast at the former UST area at a gradient of 0 0005 ft/ft, and <br /> west-southwest at a gradient of 0 0004 ft/fl in the area encompassed by wells MW-2, MW-3 and <br /> MW-5 <br />' The flow patterns observed during the May and June monitoring events may be influenced by <br /> ozone-sparging activity at the Iocations of monitoring wells MW-2, MW-3 and MW-4 <br /> 33 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Contaminants detected from laboratory analysis of monitoring well ground water samples collected <br /> in May and June 2003 included the following <br /> t - - May 2003 <br />' TPH-d and TPH-g were detected in ground water sample MW-1 at concentrations of <br /> 210,000 micrograms per liter(µg/1)and 3,200µg/1,respectively In addition,the BTEX compounds <br /> . benzene and toluene were detected in sample MW-1 at concentrations of 5 2 µg/1 and 6 4 µg/l, <br />' respectively <br /> Advanced GeoEovironmental,Inc <br />