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' 04 February 2004 AGE-NC Project No 95-0173 ' Page 8 of 10 ' • BTEX and MTBE by EPA Method 8021B, and • MTBE, TAME, DIPE, ETBE and TBA by EPA Method 8260B 33 1 Extracted Water Analytical Results The results of the laboratory analysis detected TPH-g in all three grab samples at concentrations as high as 71,000 micrograms per liter(ggll), the laboratory reported all three sample chromatograms ' to contain unmodified or weakly modified gasoline BTEX compounds were detected in all three grab ground water samples at a concentrations as high ' as 13,000 µg/l xylene, from the 45-minute time Interval sample, the maximum benzene concentration was detected in the 45-minute time interval sample at a concentration of 3,900 pg/l fFuel oxygenated compounds (MTBE, TAME, DIPE, ETBE and TBA) were not detected in the analyzed samples The laboratory reports(McCampbell Analytical Inc Work Order 0307250) and chain-of-custody forms are presented in Appendix L I3 4 PURGED GROUND WATER DISPOSAL On 11 and 12 July 2003, the ground water extracted during the pumping test was pumped from the aboveground storage Baker tank Into avacuum truck(supplied by American Valley Waste OIl) The purged water was transported off-site under hazardous waste manifest to Seaport Environmental, a waste treatment facility located in Redwood City, California Documentation and uniform non- hazardous waste manifest for disposal of the pump test purged water is contained in Appendix M 4.4. SUMMARY The implications from the July 2003 aquifer ground water pumping test are • Ground `.v2.ter draw-down of at least 7 71 feet N-as obser"ed in extraction well EW-1 following 500 minutes(8 3 hours)of constant-rate pumping operation at 5 GPM,in addition, ground water draw-down was observed in observation wells AW-1 at 0 39 feet, AW-2 at 0 56 feet, AW-4 at 0 29 feet, MW-2 at 0 27 feet and MW-3 at 0 35 feet (Table 3) No significant draw-down was observed in well MW-1 • Advanced GeoEnvironmental,Inc I