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22 July 2003 <br /> S AGE-NC Project No. 97-0327 <br /> ' Page 3 of 4 <br /> ' the area bound by wells MW-1 through MW-4 was inferred as toward the south southeast at a <br /> gradient of 0.0006 ft/ft. <br /> ' 3.2. ANALYTICAL RESULTS OF MONITORING WELL WATER SAMPLES <br /> A total of four ground water samples were submitted to CAL for analysis. TPH-g was detected in <br /> a water sample collected from well MW-2 at a concentration of 96 micrograms per liter (µg/1); <br /> TPH-d was detected in all four water samples at concentrations of 64 µg/1 , 210 µg/1 ,60 µg11 and <br />' 100 µg/1, respectively. <br /> Ethylbenzene and xylene compounds were detected in the ground water sample collected from well <br />' MW-2 at concentrations of 1.1 µg/1 and 3.6 µg/l, respectively. <br /> Utilizing EPA Method 8260M, MTBE was detected in a sample collected from MW-2 at a <br /> concentration of 15 µg/l. 1,2-DCA was detected in samples collected from wells MW-1,MW-2 and <br /> MW-4 at concentrations of 1.0 µg/l, 1.2 µg/1 and 1.9 µg/l, 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 /> 1 Laboratory Reference No. 5866) and chain-of-custody fortes are presented in Appendix B. <br />' 4.0. SUMMARY AND CONCLUSIONS <br /> The implications from the June 2003 ground water monitoring event are as follows: <br /> • The increase of ground water elevation of approximately 0.95 feet between October 2002 and <br /> June 2003 was probably due to seasonal fluctuation. <br />' • Ground water flow direction at the site was inferred to be toward the south to southeast at <br /> a gradient of 0.0006 ft/ft or less; previous ground water monitoring events at the site have <br /> determined the 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 of recharge/discharge of the local ground water could greatly modify ground water <br /> flow direction. <br /> • The ground water elevation at the site was within the screened intervals of wells MW-1, <br /> MW-2, MW-3 and MW-4, which should yield samples fully representative of shallow <br /> ground water conditions. <br /> • <br /> Advanced Geo E nvi ro n mental,Inc. <br />