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' 27 June 2003 <br /> AGE-NC Project No. 97-0327 <br /> Page 3 of 5 <br /> ' the area bound by wells MW-i through MW-4 was inferred as toward the south at a gradient of <br /> 0,006 ft/fl, or approximately 32 feet per mile. <br /> 3.2. ANALYTICAL RESULTS OF MONITORING WELL WATER SAMPLES <br /> ' A total of four ground water samples were submitted to Castle Analytical Laboratory(CAL),a DHS- <br /> certified laboratory, for analysis. TPH-g was detected in a water sample collected from well MW-2 <br /> at a concentration of 140 micrograms per liter(µg11). During the October 2002 monitoring event, <br /> TPH-d was not analyzed by the laboratory due to all four TPH-d sample containers being broken r <br /> while in custody of the laboratory. <br /> Ethylbenzene and xylene compounds were detected in the ground water sample collected from well <br /> MW-2 at concentrations of 1.3 µg11 and 6.9 µg11, respectively. <br /> ' Utilizing EPA Method 8260M, MTBE was detected in a sample collected from MW-2 at a <br /> concentration of 13 µg/l. TBA was detected in sample MW-2 at a concentration of 35 µg11 and 1,2- <br /> DCA was detected in samples collected from wells MW-1, MW-2 and MW-4 at concentrations of <br /> ' 1.2 µg11, 1.1 µg11 and 2.3 µg/1, respectively. <br /> ' No other fuel components were detected above the laboratory reporting limits. Analytical results of <br /> the ground water samples are summarized in Table 3. The laboratory reports (Castle Analytical <br /> Laboratory Reference No. 5186) and chain-of-custody forms are presented in Appendix B. <br /> 1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the October 2002 ground water monitoring event are as follows: <br /> • The increase of ground water elevation of approximately 2.73 feet between July 2002 and <br /> ' October 2002 is probably due to seasonal fluctuation. <br /> • Ground water flow direction at the site was inferred to be toward the south at a gradient of <br /> ' 0.006 ft/ft or less; previous ground water monitoring events at the site have determined the <br /> general ground water flow direction to be towards the south-southeast. <br /> • Due to the low gradient at the site, slight variations in ground water measurements or <br /> changes ofrecharge/discharge of the local-ground water could greatly modify groundwater - �`-- <br /> flow direction. <br /> 1 <br /> ' Advanced Geo.Environmental,Inc. <br /> 1 <br />