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20 January 1998",.' .AGE-NC Project No. 95=0109 Page.3.of 4 ; laboratory report(A.Keith Kaufinari-19 December 1997) and chain-of-custody form'are included „ in'Appendix B. I3.3. PETROLEUM HYDROCARBON-IMPACTED,GROUN. D WATER During the December 1997 sampling event, petroleum hydrocarbons were detected in ground water. samples three of the seven,wells sampled. TPH-g concentrations ranged from below laboratory method detection limits.to 2,500 parts per billion.(ppb; reported as micrograms per liter):.BTE&X' ; weie detected at concentrations as high as 180 ppb benzene, 130 ppb toluene; 55 ppb ethylbenzene, . and 3 50 ppb xylene'§.-The highest concentrations of'each constituent were detected in.MW-14'. TPH- g and BTE&X`were not detected inaamples collected frorn MW=6,"MW-7; MW-11 or MW_12, during the December 1997;sampling.,Hydrocarbon. concentrations decreased in all of the wells sampled during the.- fourth, quarter of 1997. Charts 1 - 6 (Appendix C) illustrate .benzene' concentration verses time for monitoring wells MW-6;MW-8, MW-9, MW=10,MW-14.and,EW-1. Tertiary butanol, was detected in`'MW-6 and MW=9' at concentrations of 6.6"ppb and 19 ppb;' respectively..Other'oxygenated compounds were not detected in.the samplescollected during the December '1997 sampling event. 1,2-Dichloroethane" was,,detected in MW-9 -and MW-14 at concentrations of 20 ppb and 37 ppb, respectively. Isopropylbenzene was detected in,MW-S and MW-9.ai concentrations of 4.9 ppb'and 14 ppb,-respectively.N-propylbenzene was detected imMW- ' 8 and MW-9.at conceriirations 'of 7.7 ppb, and 15 ppb, respectively: 1,2,4-Trimethylbenzene.was detected in MW-8, MW-9 and MW-14 at concentrations- f 41 ppb, 50 ppb.and 74 ppb,respectively. 1•,3;5-Trirnethylbenzene was detected in MW-8; MW-9 and MW7,14 at concentrations of.4.9.ppb, 15 ' b,�and 17 • , b -; respectively.. Vin 1 Acetate. was detected in'�MW-9 arid -MW-14 at a PP PP y _ concentrations .of 2,9 .ppb and 11 ppb, •respectively.: N-butylbenzene; sec-butylbenzene-and 1' naphthalene were detecied':in MW-9-at concentration's of 5.3 ppb- 7.1'ppb acid 5.7;ppb,respectively. Other analytes included in EPA. 8260 were not'detected. Analytical results'of groundwater"samples are,summarized on-Tables 4 and 5. The laboratory report (MAI `Laboratory;L: D. Nos. 84299 through:84305) and.chain-of-custody forms.are included in Appendix,B.. ; 4.0: DISCUSSION AND CONCLUSIONS Based upon data collected from the site, AGE finds: !! • "Ground water flow.direction continues to`-be toward the south-southwest at the'site. Advanced GeoEnvironmental,Inc.