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18 June 2001 AGE-NC Project No. 98-0432 tPage 4 of 6 2.3. EXTRACTED GROUND WATER ANALYTICAL RESULTS The results of the laboratory analysis for the grab ground water samples collected at 240 minutes, 480 minutes and 720 minutes are as follows and are shown on Table 3: The grab ground water sample collected at 240 minutes had TPH-g at 100 micrograms per liter,(µg/1) tand TPH-d at 67µg/1. BTEX compounds were detected at concentrations of 0.9 4g11, 7.3 µg/l, 2.7 µg/1 and 14 ,ug/l, respectively. MTBE was detected at a concentration of 1,700,ug/l by EPA Method 8020 and at a concentration of 1,500,ug/l by EPA Method 8260. The grab ground water sample collected at 480 minutes had 89µg/1 TPH-g.BTEX compounds were ' ' detected at concentrations of 0.69 µg/1, 5.5 µg/1, 2'.0 4g/l and 11 Mg/l, respectively. MTBE was detected at a concentration of 1,900 4g11 by EPA Method 8020 and at a concentration of 1,700µg/l by EPA Method 8260. The grab ground water sample collected at 720 minutes had TPH-g at 95 ,ug/l. BTEX compounds .were detected at concentrations of 0.56,ue,4.4µg/1, 1.8µg/l and 4.8 /iig/l, respectively. MTBE was detected at a concentration of 1,900 ug/l by EPA Method 8020 and at a concentration of 1,600�Zg/l by'EPA Method 8260. ' The analytical results of water samples are summarized in Table 3. The laboratory reports (McCampbell Analytical Inc. Lab I.D. 68335 to 68337), Quality Assurance and Quality Control data and chain-of-custody forms are presented in Appendix D. 3.4. PURGED GROUND WATER DISPOSAL ' .. On 13 June 2001, the ground water extracted during the pumping tests was pumped from the aboveground storage Baker tank into a vacuum truck(supplied by American Valley Waste Oil); the ' purged water was transported off-site under hazardous waste manifest to Industrial Service Oil Co. Inc., a waste treatment facility located in Los Angeles, California. Documentation and uniform hazardous waste manifest for disposal of the pump test purged water is contained in Appendix E. Advanced GeoEnvironmental,Inc.