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' .. I . ., - - - - .'�' �r: ,ilk '•*i i°' r ' 23{September 2004:' : ' F AGE=NC'Project No. 98-0440 Page 3:of 4 L . 3 2 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TRH-g'°and TPH-d were detected in the ground . er.samples collected from-wells MW-2;MW=S and MW-'6 at concentrations,as'high as'130'micrograms per.liter"(gg/1) and 41,00`µg/1, respectively. A reap showing the approximate extent of dissolved TPH-g is shownon,Figure.4. Benzene was. detected in the ground water samples collected from wells.MW-2 and MW-5 at concentrations.of " ~ 18µg11 and 5.8 µg/l, respectively. A map showing the,approximate extent of dissolved,benzene is shown on Figure 5. Toluene, ethylbenzene and xylenes were detected in the ground water sample ,j.:. collected from wells MW-2,MW-5 and MW-6 at concentrations as high as 1.0'µg/1 toluene,9.8 µg/1, -.ethylbenzene,'and 1.6 pg/1 xylenes.No other analytes were,detected at or above laboratory reporting limits iri the groundwater samples collected from the remaining wells and,domestic water wells on- „ and.off--site. ; -Current and previous analytical results are summarized in Table 3.The laboratory report(MAI Work Order Number 0406351), QA/QC report and chain-of-,custody form are included in.Appendix D. 4A: -SUMMARY AND CONCLUSIONS Based 6"n-.the data collected during this monitoring-period, AGE concludes: Ground water elevations at the site ranged from 26.44 feet above MSL in well MW-12 to 27.91 feet above MSL in well MW-L.Groundwater levels were within the screened intervals of all the monitoring wells on-site. The ground water at the site was inferred to be flowing toward the north-northwest under' an avefage gradient of 0.006 ft/ft,which is cortsistent:with ;the'flow directiori.determined during previous monitoring events: -TPH-gjPH-d and benzene were detected in the ground water samples collected from wells VIW 5. and MW-6 at maximum concentrations of 130 µg/1.TPH g (Figure 4) 100 'µg/l TPH-d, and 18'µg/l benzene (Figure 5).. Toluene, ethylbenzene and xylenes were ' detocted in the'.gr'ound water sarnpl'e.collected from wells MW 2, MW-5 and MW-6 at concentrations as high as 1.0 l toluene 9.8 1:eth lbenzene and 1.6. 1 x lenes. No µ� µ� Y µ� Y other ahalyt'es•were detected' at or'above`laboratory reporting-limits in the ground`.water ,, samples collected from the rerziaining.wells. • '` No analytes were detected at or above laboratory reporting limits in the ground water samples r . '. collected.,from the domestic water wells on- and,off-'site.' • The lateral extent of petroleum Hydrocarbon-impacted.grouridwater'has been defined. Advanced GeoEnviron mental,Inc.