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16 January 2001 <br /> . AGE-NC Project No 97-0290 <br /> Page 3 of 6 <br /> and per cent dissolved oxygen were measured for each monitoring well General system maintenance <br /> and adjustments were performed at this time The sparging flow rate was adjusted to approximately <br /> 10 scfm and to a pressure of 6 to 7 psi <br /> I <br /> 3.0. FINDINGS <br /> Ground water flow direction and gradient were inferred from data collected in the field, ground water <br /> levels were withal the screen interval of the wells on the site The hydrocarbon impact to ground <br /> water was quantified by the laboratory data obtained from the ground water samples <br /> I3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> The depths to ground water ranged from 43 36 feet to 45 36 feet below the tops of the well casings <br />' on 10 November 2000 Ground water elevations ranged from 3 47 to 4 22 feet above mean sea level <br /> (MSL) Ground water elevation decreased an average 0 42 feet over the last quarter Ground water <br /> data is summarized on Table 1 <br /> The ground water flow direction was easterly to southeasterly with a gradient of 0 0015 ft/ft The <br /> gradient of the ground water appears to diverge from the southeast corner of the site Ground water <br /> elevation contours based upon the data for the November 2000 monitoring event are illustrated on <br /> Figure 3 <br /> 3 2 ANALYTICAL RESULTS OF WATER SAMPLES <br /> ITPH-g was detected in water samples collected from wells MW-2, MW-4, MW-6 and MW-7 at <br /> concentrations of 11,000 micrograms per liter (ug/1), 4,500 ,ug/l, 53 µg11 and 80 ,ugll, respectively <br /> TPH-d was detected in samples collected from wells MW-2, MW-4 and MW-5 and MW-7 at <br /> concentrations of 620 ,ugll, 280 4g11, 50,ug/l and 98 µg/l, respectively <br />' BTEX compounds were detected in ground water samples collected from wells MW-2, MW-4 and <br /> MW-6 at maximum concentrations of 1,400 ,ug/l, 560,ug/1 and 1 3 /,cg/l, respectively <br /> Petroleum hydrocarbons were not detected in the samples collected from wells MW-1, MW-3 and <br /> MW-8 The only oxygenated compounds detected was DIPS in the water sample from well MW-6 <br /> at a concentration of 1 2 ,ug/1 <br /> Analytical results of all water samples collected at the site are summarized on Tables 2 and 3 The <br /> Advanced(GeoLnrironmentat Inc <br />