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27 February 2004 <br /> • AGE-NC Protect No 95-0141 <br /> Page 3 of 5 <br /> MW-8B (Table 1) The tops of the well screens in MW-3 and MW-5 were drowned by <br />' approximately 6 7 to 7 8 feet, respectively <br /> Wells MW-3,MW-5,MW-7,MW-8A through MW-I2 and EX-1 were used to determine ground <br />' water flow direction and gradient for shallow ground water The shallow ground water was inferred <br /> to flow generally toward the east-southeast, at a gradient of 0 004 foot/foot Figure 3 illustrates the <br /> contoured shallow ground water elevations as measured on 22 December 2003 <br /> Wells MW-6 and MW-$B through MW-12B were used to determine ground water flow direction <br /> and gradient for the deep ground water zone The deep ground water was Inferred to flow generally <br />' toward the east-southeast, at a gradient of 0 003 foot/foot Figure 4 Illustrates the contoured deep <br /> ground water elevations as measured on 22 December 2003 <br />' <br /> 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> tThe analytical results of the ground water samples were as follows <br /> • TPH-g was detected in ground water samples collected from wells MW-3,MW-6, MW-8B, <br />' • MW-9B, MW-11B and EX-1 at concentrations ranging from 260 µg11 in MW-11B to <br /> 110,000 µg11 in EX-1 <br /> • BTEX compounds were detected in samples MW-3, MW-6, MW-8B, MW-9B, MW-11B <br />' and EX-1 at concentrations as high as 6,200 µg/l of benzene, 25,000 µg/l of toluene, 3,700 <br /> µg/l of ethylbenzene and 18,900 µg/l of xylenes These high concentrations were all from <br />' well EX-1 <br /> • 1,2-DCA was detected in ground water samples collected from all wells except MW-9A, <br /> MW-10A/B, MW-11A and MW-12A/B 1,2-DCA was detected at concentrations ranging <br />' from 2 4 µg/l (MW-8B) to 190 gg/l (EX-1) <br /> The areal extent of TPH-g-and 1,2-DCA-impacted shallow and deep ground water is illustrated on <br /> Figures 5 and 6,respectively Laboratory results of water samples analyzed are summarized in Tables <br /> 2 through 5 The laboratory reports for the quarterly monitoring event (CTEL Laboratory IDs <br /> 0312-178-1 through 0312-178-15), QA/QC reports and chain-of-custody form are included in <br /> Appendix B <br /> ' 4.0. SUMMARY AND CONCLUSIONS <br /> The findings of the fourth quarter 2003 site Investigation event include the following <br /> 1 <br /> ' Advanced GcoEnvironmental,Inc <br />