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i 1 <br /> f <br /> 04 December 2000 <br /> AGE-NC Project No 99-0592 <br /> Page 3 of 4 <br /> r <br /> 3 2 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> Petroleum hydrocarbons were detected in the ground water sample collected from monitoring well <br /> MW-1, located within the former UST excavation TPH-g was detected at a concentration of <br /> 380 micrograms per liter (µg/l) Benzene, toluene, ethyl benzene and xylenes were detected at <br /> concentrations of 1 7 µg/1, 1 3 µg/1, 0 53 ugll and 0 78 /.tg/l, respectively MTBE was detected at a <br /> concentrations of 7 3 µg/1 (by EPA Method 8260) None of the target analytes were detected in <br /> sample DW-1 collected from the domestic well <br /> IAnalytical results of the ground water samples for the September 2000 monitoring event are <br /> summarized on Tables 2 and 3 The laboratory report (MAI Laboratory ID 48976 and 48977), <br />' QA/QC and chain-of custody are included in Appendix B <br />' 4.0. SUMMARY/CONCLUSIONS <br /> The following conclusions were drawn from the results of the site investigation and data collected <br /> from adjacent sites <br /> • Ground water elevation at the site decreased approximately 2 5 feet since the 14 June 2000 <br /> monitoring event <br /> • The inferred local ground water flow direction is toward the northeast Additional monitoring <br />' wells located at 3535 East Cherokee Road were utilized to construct a ground water flow <br /> direction map for the subject site Although the flow direction has rotated approximately 100 <br /> degrees to the east as compared to the June 2000 monitoring event, the northeasterly flow <br />' direction calculated during the September monitoring event is similar to previous monitoring <br /> events over the past several years <br />' TPH-g was detected in the ground water sample from monitoring well MW-1 at a <br /> concentration of 380µg/1 The TPH-g concentration was approximately 40% lower than,the <br /> concentration detected during the June 2000 sampling event <br />' MTBE was detected at a concentration of 7 3 ,ug/l in-MW-1, a decrease of approximately <br /> 40% compared to the June 2000 sampling event <br />' 9 The concentrations of benzene in sample MW-1 were approximately 50% lower than the <br /> 'concentration detected during the June 2000 monitoring event Concentrations of,toluene, <br /> ethyl benzene and xylenes were all higher during the current monitoring event <br />' a None of the target analytes were detected in the ground water sample collected from <br /> domestic well DW,-1 <br /> Advanced Ge oEnvironmentai,Inc <br /> 1 <br />