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r t -. - _ .,, . r ,•r ,' - 1, ' 23"December 2004 AGE-NC Project No. 98-0440 ; Page 3 of 4 s 3.2.- ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g and.TPH-d were detected in the ground water samples colleeted fromwells MW-2, MW-5 "arid; MW=6- at.-concentration's `as 'high-as 1;400 m ciograms"per liter (µg/1),,arid -1,1001''µg/1; respectively. A niap 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- at concentrations of, 110 1 and 61 1 respectively. A'ma showin the approximate extent`of µ� µ� , p. Y• P g pp ., dissolved benzene,is shown on Figure.5.. Toluene and ethylbenzene were detected in the,ground' , ;water sample collected from wells MW-2, MW-5 and MW-6 at concentrations'as high as 5.4 µg/l ' toluene and 180,gg/l ethylbenzene.Xylenes were detected•in the ground water.sample collected from'- -well rom;-well MW-5 at a'concentration of 4.4 µg/l..No other analytes were detected at.or above aaboratory w reporting limits'in.the groundwater samples collected from the remaining.welis and domestic water. " - wells'on- andoff-site.. :. ; Current and previous analytical results are summarized in Table 3.The laboratory report(MAT Work Order 0409100), quality assurance/quality control (QA/QQ report and chain of custody forms are ° included in Appendix D: ' 4.0. SUMMARY AND CONCLUSIONS ' Based on the data collected during this monitoring period, AGEconcludes: , Ground water elevations at,the'site'ranged from-27.50 feet above MSL iri'well•MW=12'to "28.99 feet above MSL in well°MW-1 Grourid.water 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 average gradient of 0.006 ft/ft,which is consistent with. , ` the"flow direction determined'during previous monitoring events. . • TPH--g,TPH-d and benzene were detected in,the"ground water samples collected from wells MW-2,MW-5 and MW-6 at maximum concentrations of 1,400µg/1 TPH=g,(Figure 4}, 1,100 1 TPH=d and 110 1 benzene (Figure 5) Toluene and eth lbenzene were detected µti � µ� ( l� )•� Y , ' ithe ground water•sample collected from wells MW-2' MW-5 and MW=6 at concentrations ; as high as 5 4,µg/1 toluene and 1$0 µg/Lethylbenzerie. Xylenes were detected iri the ground water sample collected'from well MW-5 ata concentration of 4.4 µg/l:No;oiher,analyt6s r r were detected at or'above laboratory"•reporting limits in the ground water samples collected from the•remaining.wells and domestic-Water,wells on- and off-'site.' No anlytes were detected at.or above laboratory reporting limits- u ' is in the groundwater samples1 1 . collected from the domestic water wells on-.'and off-site. "- .: • The lateral extent of petroleum hydrocarbon-impacted ground water has been defined: ` Advanced GeoEnvirorimental,Inc. t.