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22 July 2002 ; AGE-NC Protect No 97-0312 Page 4 of 5 " r 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES I During the June 2002 monitoring event, TPH-g was detected in the samples collected from UST-1 s' and UST-5 at concentrations of 1,500 micrograms per liter(µg/1)and 320 µg/l,respectively TPH-d I was detected in samples collected from UST-1,UST-2 and UST-5 at concentrations of 20,000 µg/l, 60 µg/1 and 87 µg/1, respectively - -0 Various BTEX compounds were detected in the sample collected from UST-1, UST-2 and UST-5 at concentrations as high as I I µg/1, 60 µg/1, 48 µg/1 and 230 µg/1, respectively, in sample UST-1 1,2'-DCA was detected in samples UST-5 and UST-6 at concentrations of 340 µg/1 and 2 7 µg/1, respectively TBA was detected in the sample collected from UST-5 at a conentration of 6 0 µg/1 - IHVOCs, including 1,1-dichloroethane (1,1-DCA), cis 1,2-dichloroethene (1,2-DCE) and tetrachloroethene (PCE), were detected in the sample collected on 10 June 2002 from the small domestic well at concentrations of 0 59 µg/l, 0 64 µg/1 and 9 3 µg/1, respectively In addition, PCE was detected in the sample collected from monitoring well UST-1 at a concentration of 2 6 µg/1 During the 08 May 2002 sampling event, toluene was detected in the small domestic well sample at a concentration of 16 µg/l, in addition, PCE was detected in at a concentration of 11 µg/1 r No other target analytes were detected above laboratory reporting levels in the ground water samples collected this quarter The laboratory reports (CTEL Laboratory ID 0205-044-1 and MAI Lab IDs ; W 0206149-001 through 0206149-008) and chain-of-custody forms are included in Appendix B Analytical results of water samples collected during the second quarter 2002 are summarized on Tables 2 and 3 The analytical results of all water samples are summarized on Tables 4 and 5 Figures 4, 5 and 6 illustrate the areal extent of TPH-g-, benzene- and 1,2-DCA-impacted ground I- water I4.0. DISCUSSION AND CONCLUSIONS ' r ' ' Based upon data collected from the site, AGE concludes • Ground water elevation decreased,approximately ,1 84 feet at the site between the February 2002 and the June 2002 monitoring events The inferred ground water flow ' direction is toward the east The average ground water gradient was 0 0001 ft/ft across the site ' During the June 2002 monitoring event, monitoring wells UST-2 through UST-4 were "drowned", and may not have yielded samples fully representative of ground water Advanced GeoEnvironmental,Inc s I '