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18,March 2005 AGE-NC Project No.'98-0440 " r Page,3 of 4 ' 3.2. ANALYTICAL RESULTS OF GROUND_ WATER SAMPLES TPH-g was detected in the ground water sample collected-from well MW-2 ata concentrations of- _ 124 micrograms per liter (µg/1). TPH-d was detected in the ground water samples collected from wells MW-2 and'MW-6 at concentrations 66 µg/1 and 74 µg/l, respectively. A map showingahe - _ approximate-extent of dissolved TPH- .is shown - own on Figure 4. Benz _ ene was detected i g inthe round - g ground water samplecollected from wells MW-2 and MW-5.;at concentrations of 30 µg11 and 2.5 µWl, s respectively...A map showing the approximate extent of dissolved benzene is shown on Fig ure 5. g Toluene; ethylbenzene and xylenes were detected in the ground water-sample collected fro, well - MW-2=- at' concentrations.'of_. I.l l toluene .•'2.4 l eth lbenzene and 7.1- xylenes-. µ µlb Y µms_ Y - Ethylbenzene was.detected in the ground water-sample collected from well MW-5 at a corfeeritration- f of.0.88 µg11. No other analytes were detected at or above laboratory reporting limits in the ground _ . - . water samples collected from the remaining wells and domestic water wells an- and off-site. 1 Current- and previous-analytical results are summarized in Table 3.Th_e laboratory report(MAI Work -. Order 0501008), quality assiurance/quality control-(QA/QC)reportand-chain of custody forms are_ ' included`in Appendix D. 4:4: SUMMARY AND CONCLUSIONS Based on the data collected during'this monitoring period,AGE'concludes "`: • . Ground water elevations at the site ranged from 25.78 feet-above MSL in wells MW=8'and MW-12 to,26.86 feet-above MSL.in.we_ ll MW-1. Groundwater levels were within the ' screened-intervals of.all tk monitoring wells on-site.-The ground water'at the site .was inferred to be flowing toward the north-northwest under an average gradient of 0:005 ft/ft, -� which.is consistent with the flow direction determined,during.previous'monitoring events. TPH-g was detected in-the ground water sample collected- from well MW-2 at a concentrations of 120 micrograms per liter(µg11). TPH=d was detected in the ground water - v ; =samples collected from wells MW-2 and MW-6 at concentrations of 66 4gll and 74 µg/1, - •-. respectively. A, map showing the approximate extent of•dissolved TPH-g is shown-on Figure 4. .'Benzene:was detected in the ground water samples collected from wells MW-2 and MW-5 , 'ai.e_ entrations of 30µg/1 and 2.Sµg11,respectively.A map showing the approximate extent ' of.dissolved benzene is'shown on Figure.5. - - • Toluene;ethylbenzene and'xyle'nes were detected irithe ground water sample collected.from. 'well MW-2 at conceritrations.cf 1'.l.µg/l toluene,2.4µg/1 ethylbenzene and 7.1 µg11 xylenes. Ethylbenzene was detected in'the ground water sample collected.from well MW-5 at a -• Advanced GeoEnvironmental,-Inc. -