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' 29 August 2001 <br /> • AGE-NC Project No 96-0229 <br />' Page 3 of 5 <br />' 3 <br /> The general ground water gradient at the site was calculated to be approximately 0 003 ft/ft or less, <br />' or approximately 16 feet per mile and Inferred to be flowing towards the northeast The ground water <br /> surface elevation at the site Is approximately 20 and 22 feet above the slotted screen Intervals in <br /> wells MW-1 and MW-1 OB,respectively, but within the screened intervals or within a few feet of the <br /> Iscreened Intervals of the remaining wells <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> A total of eleven ground water samples were submitted to a DHS-certified laboratory TPH-g was <br /> detected In water samples collected from wells MW-1,MW-2,MW-3,MW-6, MW-7 and MW-IOA <br /> at concentrations as high as 84,000 micrograms per liter(,Ug/1) <br />' BTEX compounds were detected in ground water samples collected from wells MW-1, MW-2, <br /> MW-3,MW-6 and MW-1QA at concentrations as high as 17,000/cg/l (xylene, MW-3) The highest <br /> • benzene concentration was detected in sample MW-1 at a concentration of 11,000 ,ug/l <br /> MTBE was detected EPA 8260in ground water samples collected from wells MW-1 MW-6 <br /> MW-7,MW-8,MW-10A and MW-10B at concentrations as high as 920µg/1 (MW-6) No other fuel <br /> oxygenated additives were detected above laboratory reporting limits in the analyzed samples <br /> Previous and current analytical results of ground water monitoring well samples are summarized in <br /> Tables 2 and 3 The laboratory reports (Castle Analytical Laboratories Reference No 3867) and <br /> chain-of-custody forms are presented in Appendix B <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The Implications from the findings of the June 2001 Investigation are <br /> • Ground water flow direction In the area of wells MW-1 through MW-10 was Inferred <br /> towards the northeast at a gradient of 0 003 ft/ft or less This appears to be the prevailing <br /> flow direction for the area <br /> • Due to the low hydraulic gradient at the site, slight variations in ground water measurements <br /> or changes of recharge/discharge of the local ground water could greatly modify the Inferred <br /> ground water flow direction <br /> . o Monitoring wells MW-1 and MW-IOB are "drowned", and yield samples representative of <br /> Advanced GeoEnvironmental,Inc <br />