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I28 March 2002 <br /> AGE-NC Project No 95-0141 <br />' Page 3 of 4 <br />' 3 2 ANALYTICAL RESULTS FROM GROUND WATER SAMPLES <br /> Monitoring wells MW-1 through MW-8 were sampled on 12 February 2002, wells MW-1 through <br /> MW-5 were "drowned", and may not have yielded samples fully representative of ground water <br /> conditions near the top of the saturated zone where fuel hydrocarbons would be expected to have the <br /> greatest Impact <br /> The analytical results of the ground water samples were as follows <br /> • TPH-g was detected in ground water samples collected from all monitoring wells except <br /> MW-5 TPH-g concentrations ranged from 58 micrograms per liter (µg/1) in MW-7 to <br /> 150,000 µg/1 In MW-1 BTEX compounds were detected in the ground water samples <br /> collected from monitoring wells MW-1 through MW-6 at concentrations as high as 8,600 <br /> µg/1 benzene (MW-1), 25,000 gg/1 toluene (MW-1), 3,200 µg/1 ethylbenzene (MW-1) and <br /> 15,000 µg/1 xylenes (MW-1) <br /> • TBA was detected in the samples collected from MW-5 and MW-6 at concentrations of <br /> 6 1 µg/1 and 9 1 µg/1,respectively MTBE was detected in the sample collected from MW-6 <br /> at a concentrations of 1 1 µg/1 DIPE, ETBE and TAME were not detected In the ground <br /> lie water samples collected from the site <br /> • 1,2-DCA was detected in ground water samples collected from all monitoring wells <br /> Concentrations ranged from 4 6 µg/1 (MW-4) to 310 µg/1 (MW-1) EDB was not detected <br /> in the ground water samples collected from the site <br /> Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in <br /> Tables 2, 3 and 4 The laboratory reports for the quarterly monitoring event (MAI Lab IDs 90486 <br /> Ithrough 90493) QA/QC reports and chain-of-custody form are Included in Appendix B <br /> The areal extent of TPH-g,benzene and 1,2-DCA Impacted ground water Is Illustrated on Figures 4, <br /> 5 and 6, respectively <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> The findings of the 12 February 2002 site Investigation events include the following <br /> • Measured ground water elevation Is approximately 11 8 feet below msl, and was within the <br /> screened interval of the two shallow monitoring wells (MW-7 and MW-8) Ground water <br /> was approximately 9 to 10 feet above the screened intervals of MW-1 through MW-5 and <br /> was approximately 40 feet above the screened Interval of the deep well MW-6 <br /> Advanced GeoEnvironmental,Inc <br />