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30 June 2003 <br /> • AGE-NC 1 Project No 95-0103 <br /> Page 5 of 7 <br /> 3 2 GROUND WATER MONITORING RESULTS <br /> I <br /> Field and laboratory analytical results of the April 2003 monitoring event include <br /> 3 2 1 Ground Water Elevations and Gradient <br /> Depth to ground water ranged from 13 65 to 15 70 feet below the top of the well casings The ground <br /> water elevations ranged from 8 28 (MW-7) to 9 43 feet (MW-3) below sea level Ground water <br /> elevation increased approximately 0 6 feet between the January and Apr112003 monitoring events <br /> (Table 1) <br /> The ground water flow directions were radially Inward toward a circular depression in the area of <br /> wells VE-2 and MW-3 at the western portion of the site, ground water flow Is inferred to be <br /> ' controlled by the ground water extraction system The ground water gradient was approximately <br /> 0 02 ft/ft from the east of the site or well MW-7 The ground water elevation contours are depicted <br /> 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-1,MW-3,MW-4 and <br /> MW-5 at concentrations of 660 µg11, 2,600 µg/1, 260 µg/1 and 280 µg/l, respectively <br /> 1 <br /> Various BTEX compounds were detected In ground water samples MW-1, MW-3 and MW-4, <br /> benzene was only detected In sample MW-4 at a concentration of 3 6 µg/1, ethylbenzene was <br /> idetected In samples MW-1 and MW-3 at concentrations of 8 7 µg/1 and 16 µg/1, respectively, and <br /> total xylenes was detected In sample MW-3 at a concentration of 2 0 µg/1 <br /> The fuel additives MTBE and DIPE were detected In the analyzed samples,MTBE was detected In <br /> samples MW-1, MW-3,MW-4,MW-5 and VE-5 at concentrations of between 5 0µg/1(VE-5) and <br /> 160 µg/1(MW-5), and D1PE was detected In samples MW-1, MW-3 and MW-5 at concentrations <br /> of 5 6 µg/l, 14 µg/1 and 6 7 µg/l, respectively <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 2 and 3 The laboratory report of the <br /> current ground water sampling data (CalTech IDs 0304-0128-1 to-5 and MAI0304349), quality <br /> ' assurance and quality control(QA/QC)data and chain-of-custody form are Included In Appendix D <br /> 1 <br /> Advanced GeoEnvironmental,Inc <br />