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12 July 2001 <br /> AGE-NC Project No 98-0433 <br />' Page 3 of 5 <br />' 3 1 GROUND WATER GRADIENT AND FLOW DIRECTION <br /> Depth to ground water at the site on 10 April 2001 ranged from 18 65 to 20 36 feet below well <br />' casing tops The ground water elevations at the site ranged from 38 37 feet to 38 51 feet above mean <br /> sea level (msl) The data indicates an average decrease of the ground water elevation at the site of <br /> 0 22 feet since the previous quarterly monitoring event <br />' Ground water flow direction andadient were calculated from the April 2001 gauging data The <br /> �' P <br /> flow direction was determined to flow in a southwesterly direction with a hydraulic gradient of <br />' approximately 0 001 feet/feet The depth to ground water and calculated elevation date are presented <br /> in Table 1 Figure 3 illustrates the contoured ground water elevations <br /> 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br />' Petroleum hydrocarbons were detected in seven of the ground water samples analyzed <br /> TPH-g was detected in the ground water samples collected from MW-1, MW-2,MW-6, and MW-8 <br /> at concentrations ranging from 130 micrograms per liter(ug/1) (MW-8) to 1,400,ug/l (MW-1) <br />' TPH-d was detected in water samples from wells MW-1 through MW-3 and MW-5 through MW-8 <br /> at concentrations ranging from 63 gg/l (MW-3) to 6,200,ug/l (MW-1) <br />' Benzene was detected only in samples MW-1 and MW-2 at concentrations of 31 ugll and 2 4 ug/l, <br /> respectively The remaining BTEX compounds were also detected in these two wells at <br /> concentrations as high as 9 2 ug/1 (xylenes in MW-1) <br /> MTBE was detected by EPA method 8260 in samples MW-1, MW-2, MW-4 and MW-8 at <br /> concentrations of 3,300 ,ug/l, 15 4g/1, 16 ,ug/l, and 3 6 µg11, respectively Of the remaining fuel <br />' oxygenates, TBA was detected in samples from well MW-2 and MW-8 at 9 7ug/1 and 6 0 /,cg/l, <br /> respectively Petroleum hydrocarbons and fuel oxygenates were not detected in the domestic water <br />' well sample <br /> Analytical results from ground water samples are summarized in Table 2 The laboratory report <br />' (MAI Lab ID 65256 to 65264), quality assurance and quality control(QA/QC) and cham-of-custody <br /> are included in Appendix B <br /> Advanced CeoEnvironmental,Inc <br /> I <br />