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02 November 2000 <br /> AGE-NC Project No.95-0109•" _ <br />' Page 3 of 4 i <br /> 3.2. MICROBIOLOGICAL�ACTIWTY IN GROUND WATER <br /> General subpopulations decreased in MW-9 and increased in MWA4.-Selective subpopulations <br /> increased in well MW-9 and remained stable in MW-14. Nutrient concentrations gerieially remained <br /> stable,but were less than optimal for ongoing bioremediation. Field measurement for indicators of <br /> microbiological activity are summarized on Table.2;microbiological and physicochemical analytical <br /> results are,summarized on Table 3. The laboratory report (A.-Keith Kaufman 16. October 2000)-and <br />' m 'Appendix B.chain-ofcustodyforare included in <br /> 3:3., ;: PETROLEUM-HYDROCARBON-IMPACTED GROUND WATER <br />' Petroleum-hydrocarbons were detected in ground water samples from four. of the• seven.wells <br /> sampled. TPH-g concentrations ranged up to 4,300 parts per billion (ppb; reported'as micrograms <br /> per liter). Benzene, toluene, ethylbenzene and xylenes were detected at concentrations as high as 4.3. <br />' ppb,.1 l ppb,•110 ppb and 150 ppb,respectively.The highest concentrations were detected in samples <br /> collected from MW-8 and MW-9. Petroleum hydrocarbons were not detected in ahe samples <br /> collected from MW-6, MW-7 and MW-12. The results of analysis by.EPA Method 8015M/602 for <br /> 10 the g <br /> September 2000 monitoring event are presented on Table 4. Historical analytical results by EPA <br /> p <br /> Method 8015m/602 'are summarized in Table 5. <br />'. Fuel ox `enated com ounds were not detected in the samples collected. The laboratory report,(MAI <br /> yg p . <br /> Laboratory I. D. Nos. 48969 through 48975) and chain-of custody'forms are included in Appendix <br /> B. <br /> 4.0. DISCUSSION AND.CONCLUSIONS <br /> Based upon-data collected.from the site, AGE finds: <br /> Ground water elevations decreased atthe an,average of 1.78 feet during the third 4uarter <br /> of 2000. Ground water flow;direction is towardthe south at the site. <br /> Hydrocarbon concentrations in ground water generally decreased at the site between the June <br /> and September 2000, sampling' events, 'but'appear, to. be within ,the4 normal range of " <br /> concentrations detected in each well over time. <br /> • . Fuel oxygenates were not detected in the ground water samples collected during the third <br />' quarter 2000 monitoring,event; <br /> Advanced GeoEnvironmental,Inc. <br />