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10 May 1999 �.. AGE-NC Project No. 95-0103 Page 3 of 6 • Volatile aromatic compounds (benzene, toluene, ethyl-benzene and total xylenes: BTEX) in accordance with EPA method 8020. 2.4. DISPOSAL OFPURGED GROUND WATER On 31 March 1999, approximately 600 gallons of previously purged ground water were collected by Nor Cal Oil of Turlock, California for final disposal at a licenced treatment facility. A copy of the generators manifest are included in Appendix D. _ 3.0. FINDINGS Field measurements and laboratory reports are presented below and in Tables 1 through 5. Copies of the field measurements and laboratory reports are included in Appendices A, B and C. 3.1. RELATIVE GROUND WATER ELEVATION — The ground water elevations were calculated by subtracting the depths to ground water from the surveyed well casing elevations (Table 1). Ground water elevation increased approximately 1.04 feet between December 1998 and March 1999. The upper surface of the saturated zone on the site appears to have a depression on the northern portion of the property (Figure 3) near well MW-1; a ground water high was again noted in the vicinity of monitoring well MW-4. Ground water flow on the site is toward MW-1. 3.2. ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in samples from wells MWA, MW-3, MW-4 and vapor well VE-6 at concentrations of 680 micrograms per liter(ug/1). 6,300µg11, 500µg/l and 4,800 µg19, respectively. Benzene was detected in ground water samples collected from wells MW-1, MW-3, MW-4 and _ vapor well VE-6 at concentrations of 4.9 µg/1, 86 µgll, 65 µg/l and 200 µg11, respectively. Benzene was not detected in samples from wells MW-2, MW-5, or MW-6. Other BTE&X compounds were detected in samples MWA, MW-3 , MW-4 and vapor well VE-6 at concentrations as high as 450 µg/l. Petroleum hydrocarbons were not detected in the samples collected from wells MW-2 and MW-6. Advanced Geu£nvironmental,Inc.