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t <br /> 7 a <br /> 4 <br /> 21 October 1997 r <br /> AGE-NC Project No 95-0121 t - <br />' Page 3 of 5 <br /> 3 2 ' LABORATORY RESULTS"OF GROUND WATER SAMPLES ` <br /> TPH-g was detected in ground water samples collected from wells MW-1 through MW-4, MW-6 <br /> and MW-7 The highest concentrations of TPH-g was reported from MW-7 at 89,000 kcgll - <br />', (micrograms per liter or parts per billion ppb), while the lowest was reported from MW-6 at 100 <br /> ppb <br /> TPH-d was detected in ground water samples collected from wells MW-1 through MW-4 and MW-6 <br /> through MW-8 The highest concentrations of TPH-d was reported from MW-3 tat 24,000 ppb,while <br />' the lowest was reported from MW-6 at 74 ppb, however the laboratory reported that these,TPH-d R <br /> -detections had chromatograms with non-diesel patterns and characteristics <br />' Benzene was detected In ground water samples collected from wells MW-1 through MW-4 and MW- <br /> 7 The highest concentrations of benzene was reported from MW-3 at 12,000 ppb, while the lowest <br /> was reported from MW-7 at 160 ppb Toluene, Ethylbenzene and Xylenes were detected in samples <br />' collected from wells MW-1 through MW-4 and MW-7 The highest concentrations were reported <br /> from MW-3 at 6,500 ppb, while the lowest concentrations were reported from MW-7 at 36 ppb <br /> MTBE was detected in a ground water sample collected from MW-5 at a concentrations of 7 4 ppb <br /> utilizing EPA method 8260 <br />' Overall, the more intensely impacted ground water Is in the vicinity of monitoring wells MW-1, <br /> MW-2, MW-3, and MW-4, with MW-3 being the most intensely impacted The analytical results <br />' for ground water samples are summarized in Table 2 -Analytical Results of Ground Water Samples <br /> The laboratory report (Castle Analytical Laboratory Reference No 1230) and chain-of-custody <br /> forms are included In Appendix B <br /> ' <br /> 4.0. CONCLUSIONS/SUMMARY Y <br /> Based upon data collected during the August 1997 monitoring, AGE concludes - y <br /> • Laboratory data continues to indicate that the greatest concentrations of dissolved petroleum , <br /> hydrocarbons are located near MW-1 through MW-4'("core area") and MW-7 <br /> • 1 e <br /> 'Concentrations of benzene detected in wells MW-1 through MW-4 and MW-7 exceeded the <br /> State of California Maximum Contaminant Level (MCL) for drinking water of 10 ug/1 <br />' Concentrations of toluene detected in wells MW-1 and MW-3 exceeded the MCL of 150 <br /> /jg/l x <br /> m Advanced GcoEnnronmcntal,Inc <br /> K <br />