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i <br /> I18 September 1998 <br /> • AGE-NC Project No 96-0254 <br /> Page 6 of 8 <br /> IUST area <br /> Benzene was detected in three samples from MW-1 at concentrations ranging from 0 008 ppm <br /> 1 (MW1-10')to 89 ppm (sample MW1-5'). Toluene, ethyl benzene and xylenes were also detected in <br /> 1 each sample from MW-1 at concentrations up to 89 ppm (MW 1-5') <br /> No petroleum hydrocarbons or BTEX were detected in the soil samples collected from MW-2, MW- <br /> 3, MW-5 or MW-6 Fuel oxygenates were not detected in any of the soil samples analyzed <br /> Laboratory results of soil samples analyzed for TPH and BTEX are summarized in Table 1 <br /> Laboratory results for soil samples analyzed for fuel oxygenates are summarized in Table 2 The <br /> laboratory reports (MAI Laboratory ID 85855 to 85861), QA/QC reports and chains-of-custody are <br /> included in Appendix D <br /> I3 3 GROUND WATER ELEVATION AND GRADIENT <br /> 1.1 Ground water elevation in each well was calculated by subtracting the depth to ground water from <br /> the surveyed casing elevations(Table 4) Ground water gradient on 27 February 1998 was calculated <br /> to be an average of 0 01 foot/foot directed toward the northwest on the site, shifting towards the <br /> north-northeast off-site Ground water elevation on 27 February 1998 is illustrated on Figure 3 <br /> 34 LABORATORY RESULTS OF GROUND WATER SAMPLES <br /> TPH-g was detected in samples collected from well MW-IA and MW-IB at concentrations of 5,000 <br /> and 4,300 parts per billion(ppb,reported as micrograms per liter),respectively TPH-d was detected <br /> samples collected from wells MW-IA and MW-IB at concentrations of 1,400 ppb and 1,200 ppb, <br /> respectively <br /> Benzene was detected in samples collected from wells MW-IA and MW-1B at concentrations of 200 <br /> ppb and 480 ppb, respectively Toluene, ethyl benzene and xylenes were also detected in MW-IA <br /> and MW-I B at concentration up to 600 ppb (xylenes, MW-1 B) <br /> No TPH-g, TPH-d,BTEX or fuel oxygenates were detected in other ground water samples collected <br /> during this investigation Laboratory results of ground water samples analyzed for petroleum <br /> hydrocarbons are summarized in Table 4 The laboratory reports (MAI Laboratory ID 86325 to <br /> I86331), QA/QC reports and chain-of-custody forms are included in Appendix E <br /> • <br /> Advanced GeoEnviron mental Inc <br />