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' 16 April 2002 AGE-NC Project No 00-0769 Page 4 of 6 4 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES 1 Momtoringwells MW-1,MW-2A,MW-2B,MW-3A and MW-3B were sampled on 05 March 2002 ' The analytical results of the ground water samples were as follows • TPH-g and BTEX compounds were detected in ground water samples collected from all ' monitoring wells except MW-2A TPH-g concentrations ranged from 9,600 µg/l (MW-3A) to 160,000 µgd(MW-1) The maximum concentrations of BTEX compounds were detected in the sample collected from MW-1,at concentrations of 32,000 µg/1(benzene),37,000µg/1 (toluene), 2,400 µg/l (ethylbenzene) and 21,000 µg/1 (total xylenes) 1,2-DCA was detected in ground water samples collected from MW-1, MW-2B and MW-3B at concentrations of 2,900 µg/1, 1,100 µg/1 and 9 2 µg/1,respectively EDB was not detected ' In any of the ground water samples collected during the March 2002 monitoring event • Utilizing EPA Method S W846 8021,MTBE was detected in ground water samples collected ' from all monitoring wells except MW-2A,at a maximum concentration of 500µg/l(MW-1) The detected concentrations were not confirmed utilizing EPA Method 8260 Laboratory results of water samples analyzed for petroleum hydrocarbons are summarized in Tables 2 and 3 The laboratory reports for the quarterly monitoring event (CTEL Laboratory IDs 0203-030-1 through 0203-030-5) QA/QC reports and chain-of-custody form are included In Appendix B ' 5.0. SUMMARY AND CONCLUSIONS The findings of the March 2002 site investigation event Include the following Contamination by TPH-g and BTEX constituents was encountered In ground water samples collected from four of the five on site monitoring wells (MW-1, MW-2B, MW-3A and MW-3B) Concentrations as high as 160,000 µg/1 TPH-g, 32,000 µg11 benzene, 37,000 µg/1 I toluene, 2,400 µg/1 ethylbenzene and 21,000 µg/1 total xylenes were detected, • 1,2-DCA was detected in ground water samples collected from monrtoring wells MW-1, MW-2B and MW-3B at concentrations as high as 2,900µg/l(MW;1) EDB was not detected In any of the ground water samples collected during the first quarter 2002 monitoring event • 'MTBE was detected In ground water samples collected from four of the five monitoring wells at concentrations as high as 500 µg/1 utilizing EPA Method 8020 The detected 'concentrations were not confirmed by EPA Method 8260, MTBE had not been detected Advanced GeoEnviron mental,Inc