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i <br />' 3.2 ANALYTICAL R ULT <br /> IA summary of the analytical results of the third quarter of groundwater sampling is presented <br /> in Table 3-2 Histoncal groundwater analytical results are presented on Table A-2 in Appendix <br /> IA The analytical reports and Cham of Custody forms are presented in Appendix C. <br /> Petroleum hydrocarbons detected in the sample collected from MW-2A include benzene (1,900 <br />' µg/L), toluene (710 µg/L), ethylbenzene (1,200 µg/L), xylene (1,800 µg/L), and TPH-G (17 <br /> mg/L). The concentration of benzene was unchanged from the previous sampling event. All <br />' other analytes continued a downward trend evident since monitor well MW-2A was first sampled <br /> in 1995 <br />' Petroleum hydrocarbons detected in the sample collected from MW-2 include benzene (5,400 <br /> µg/L), toluene (310 µg/L), ethylbenzene (890 µg/L), xylene (1,400 µg/L), and TPH-G (13 <br /> mg/L) The analyte concentrations have declined significantly since the last time this well was <br /> sampled in 1988 <br />' sample Petroleum hydrocarbons detected in the le collected from MW-7 include benzene (2.6 <br /> t y p <br /> 10 <br /> µg/L), toluene (0 7 ug/L), and TPH-G (0 32 mg/L) These analytes have been detected <br /> sporadically in MW-7 in previous sampling events. Monitor well MW-7 is located down <br /> gradient of the contaminant source area <br /> TPH-G was detected in well MW-3A (0 15 mg/L) Ethylbenzene and TPH-G were detected in <br /> well MW-8 (0 5 µg/L and 0 92 mg/L, respectively) Ethylbenzene was detected in well MW-9 <br /> (0 6µg/L) Petroleum hydrocarbons were not detected in the samples collected from MW-4 and <br />' MW-6 <br /> I <br /> & <br /> L IPROJECiSI3ANJOQ151C}6SA 4TH 7 July 1997 <br />