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' 20 December 2002 <br /> AGE-NC Project No 95-0185 <br /> Page 6of7 <br /> ' 3 2 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Dunng the September 2002 sampling event, the depth to ground water ranged from 24 27 feet <br /> ' (MW-2)to 24 94 feet(MW-3)below casing grade However,the depth to ground water(24 59 feet) <br /> at well MW-4 was affected by the presence of free product, the depth was recalculated(24 58 feet) <br /> utilizing the measured thickness of free product in well MW-4 <br /> 1 D,,=D. - (tg * d�dw) <br /> ' Dw=Corrected depth to water <br /> D =Measured depth to water <br /> tg=Total thickness of free product (-0 012 foot) <br /> ' dg=Density of free product (diesel at—0 88 g/ml) <br /> dw=Density of water (-1 0 gm/ml) <br /> ' Ground water elevation ranged from 35 06 feet (MW-4) to 35 21 feet (MW-1 and MW-2) above <br /> mean sea level (MSL)Based on the ground water elevations from wells MW-1 through MW-4,the <br /> ground water flow was inferred to radiate outward from southwest to northwest at a gradient of <br /> 10 approximately 0 003 ft/ft <br /> 1 3 3 LABORATORY RESULTS OF SOIL SAMPLES <br /> ' A total of three soil samples were analyzed for TPH-g, TPH-d, BTEX and fuel additives None of <br /> the target compounds were detected in the soil samples analyzed <br />' Laboratory results of soil samples analyzed for petroleum hydrocarbons, fuel additives and VOCs <br /> are summarized in Table 4 The laboratory reports(MAI Laboratory 11D 0211054),quality assurance <br /> and quality control (QA/QC)reports and chains-of-custody are included in Appendix E <br /> 3 4 LABORATORY RESULTS OF GROUND WATER SAMPLES <br />' TPH-d was detected in ground water samples collected from wells MW-1 through MW-3 at <br /> concentrations of 15,000 micrograms per liter(pg/1), 1,100 µg/1 and 430 µg/1,respectively TPH-g <br /> was detected in ground water sample MW-1 at a concentration of 120 µg/l,however,the laboratory <br /> noted that strongly aged gasoline or diesel range compounds were significant Toluene was detected <br /> in the ground water sample from well MW-1 at a concentration of 0 55µg/1 <br />'•, No other target analytes were detected in the analyzed samples Current and previous analytical <br /> results are summarized in Tables 2 and 3 The laboratory report (MAI Laboratory I D Nos <br />' Advanced GeoEnvironmental,Inc <br />