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r27 August 2001 <br /> •� AGE-NC Project No 95-0104 <br /> rPage 3 of 4 <br /> r3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in the water samples collected from wells MW-2, MW-5 and VW-1 at <br /> r concentrations of 200 micrograms per liter (µg/l), 85 µg/1 and 96 µg/1, respectively TPH-d was <br /> detected in the water sample collected from MW-2 at a concentration of 75 4g/1 However, the <br /> laboratory noted that gasoline range compounds were significant in the sample from MW-2 <br /> rBTEX compounds were detected in the ground water samples collected from MW-2,MW-3,MW-4 <br /> and VW-1 at concentrations as high as 30 µg/1 benzene, 14 µg/1 toluene, 4 0 µg/1 ethylbenzene and <br /> r24 µg/1 total xylenes 1,2-DCA was detected in the ground water samples collected from MW-1, <br /> MW-5 and VW-1 at concentrations of 3 0µg/1, 160 µg/1 and 5 7 µg/1, respectively <br />' Fuel oxygenated compound were not detected at concentrations at or above laboratory reporting <br /> limits in the ground water samples collected Maps depicting the approximate extent of TPH-g-and <br />' 1,2-DCA-impacted ground water are presented in Figures 4 and 5 Analytical results of the ground <br /> water samples are summarized in Table 2 The laboratory reports(McCampbell Analytical Inc Lab <br /> I D No 71192 through 71198) and chain-of-custody forms are presented in Appendix B <br /> I • <br /> 4.0. DISCUSSION AND CONCLUSIONS <br /> rBased on data collected during the June 2001 environmental activities, AGE concludes <br /> • The ground water flow direction is inferred to be towards the northeast under an average <br /> hydraulic gradient of 0 003 feet/feet Figure 3 illustrates the contoured ground water <br /> elevations <br /> • Low concentrations of dissolved TPH-g and BTEX compounds are present in wells MW-2, <br /> MW-5 and VW-1 and a low concentration of dissolved TPH-d was detected in well MW-2 <br /> Benzene concentrations in samples from MW-2 and VW-I exceeded the State of California <br /> Maximum Contaminant Level (MCL) of 10 µg/1 <br /> • 1,2-DCA was detected at low concentrations in wells MW-1 and VW-1 and at a higher <br /> concentration in well MW-5 (160 µg/1), all detected concentrations exceeded the State of <br /> California MCL of 0 5 µg/l <br /> 5.0. RECOMMENDATIONS <br /> IBased on the findings of this investigation,AGE recommends continued quarterly monatonng of the <br /> ground water monitonng wells The next monitoring event should be performed in December 2001 <br /> Advanced CeoEnvironmental,Inc <br />