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01 November 2002 <br /> AGE-NC Project No 95-0103 <br /> Page 5 of 6 <br /> Depth to ground water ranged from 14 33 to 16 67 feet below the top of the well casings The ground <br /> ' water elevations ranged from 9 25 (MW-6) to 10 25 feet (MW-4) below sea level Ground water <br /> elevation decreased approximately 2 5 feet between the May and September 2002 monitoring events <br /> ' (Table 2) <br /> The general ground water flow direction was Inferred to be southeast, however, the flow radiates <br /> Inward between south-southeast north of the site and easterly west of the site The ground water <br /> gradient was approximately 0 005 ft/ft The ground water elevation contours are depicted in Figure 3 <br /> ' 3 2 2 Analytical Results of Ground Water Samples <br /> ' TPH-g was detected in the ground water samples from monitoring wells MW-3,MW-4 and MW-5 <br /> at concentrations of 2,400 microgram per liter (gg/1), 2,200 µg/l and 640 µg/l, respectively <br /> ' Various BTEX compounds were detected in ground water samples MW-3 and MW-4 at maximum <br /> concentrations of 5 8 Rg/l benzene, 1 3 µg/l toluene,58 µg11 ethylbenzene and 15 1 µg11 total xylenes, <br /> 10 <br /> in sample MW-4 µg11 <br /> The fuel additive MTBE was detected in the sample collected from well MW-4 at a concentration <br /> ' of 5 0 µg11 <br /> No other target analytes were detected in the samples analyzed The analytical results of current and <br /> ' previous monitoring well samples are summarized in Tables 3 and 4 The laboratory report of the <br /> current ground water sampling data(CalTech IDs 0209-034-1 to -5), quality assurance and quality <br /> control (QA/QC) data and chain-of-custody form are included in Appendix D <br /> 4.0. SUMMARY/CONCLUSIONS <br /> Based on the results of ground water remediation activities, AGE concludes the following <br /> Between 30 May and 22 August 2002,the pump-and-treat system processed approximately <br /> ' 641,602 gallons of water AGE estimates that an average 7,730 gallons of water was <br /> discharged per day during this time <br /> ' • Dissolved hydrocarbons were aetected from ground water samples collected at the Influent <br /> end of the treatment system Based on the amount of ground water processed and laboratory <br /> analytical results, approximately 168 lbs of benzene and 37 lbs of TPH-g were removed <br /> ' from the extracted ground water between 30 May and 22 August 2002 (Table 1) <br /> i <br /> 1 Advanced GeoEnvironmental,Inc <br />