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4 <br /> ' fA <br />' 12 February 2002 <br /> AGE-NC Project No 95-0135 , <br />' Page 3 of 4 <br />' 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> t <br /> TPH-g was detected in the water samples collected from monitoring wells MW-lA and MW-1B <br />' at concentrations of 13,000 micrograms per liter (µg/1) and 430 µg/1, respectively TPH-g was <br /> detected in the water samples collected from monitoring wells MW-2A and MW-2B at <br /> concentrations of 410 µg/1 and 3,900 µg/1, respectively TPH-g was detected in the water samples <br />' collected from monitoring wells MW-3A and MW-3B at concentrations of 220 pg/1'and 470 µg/1, <br /> respectively <br />' Benzene was detected in samples MW-IA, MW-2A, MW-2B and MW-3A at concentrations of <br /> 1,300 µg/l, 38 µg/l, 97 µg/1 and 1 1 µg/l, respectively The other BTEX compounds were variously <br /> detected in the samples at concentrations ranging from 0 68 µg/1 (toluene in MW-3A) to 350 µg/1 <br />' (ethylbenzene in MW-lA) <br />' DIPE, MTBE and TBA were detected in water samples collected this quarter DIPE was detected <br /> in samples MW-2A and MW-2B at concentrations of 20 µg/1 and 2 0 µg/1, respectively MTBE and <br /> TBA were detected in the well MW-2B sample at concentrations of 39 µg11 and 480 µg/1, <br />' • respectively <br /> Analytical results of groundwater samples are summanzed on Table 2 The laboratory report(MAI <br />' laboratory 1D 81644 to 81669), Quality Control and Quality Assurance (QA/QC) and chain-of- <br /> custody are in Appendix B <br />' 4.0. SUMMARY/CONCLUSIONS <br /> F , <br />' The following conclusions were drawn from the results of this investigation <br /> s < <br /> • On 18 October 2001 the shallow,ground water flow direction at the site was generally toward <br /> the northeast Ground water elevation had decreased an average 1 8'feet between the April <br /> and October 2001 monitoring events <br /> • The analytical data from samples MW-1 and MW-2 indicated that the highest concentration <br /> of dissolved hydrocarbons are on the western portion of the site <br /> • Monitoring well MW-3 appears to be located near the eastern margin of the dissolved <br />' hydrocarbon plume <br /> • The lateral extent of diss6lved hydrocarbons is not defined to the west, south and north of <br /> wells MW-1 and MW-2 <br /> f <br /> Advanced GcoEnvironmental,Inc <br />