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. 1 Oanuary 2,0,01 AGE'NC-Project No: 95-01.09 Page 3 of 4 3.2." . PETROLEUM HYDROCARBON-IMPACTED GROUND WATER . Petroleurl hydrocarbonswere detected in';ground water samples from,four of the seven wells sampled. TPH-�g concentrations ranged up to 2,900 micrograms per liter (µg/1}. Benzene,.toluene, eth lbenzene and xylenes were detected at coriccintrations.as,hiih as 216 Az 1, 110 4g/1, 100µg/1 and 510µg/1,respectively-The highest concentrations were.detected in samples collected froni� MW-8 .- : e' and MW-14. Petroleum hydrocarbons were not detected inth ,samples collected, from MW-6; MW-11 and MW-12. The results of analysis by EPA Method 8015m/602 for the December 2000. . monitoring event are presented on Table 4. Historical analytical results by EPA Method 8015m/602 are summarized in Table S.... 1,2-Dichloraethane(1,2-DCA)was detected in MW-7,MW=S and MW-14 at concentrations'as great as 15.ppb Four additional,analytes; detected by EPA Method 8260, are noted'in Table 6. Fuel oxygenated,compounds.were not detected in the samples collected:' The laboratory report (MAI Laboratory 1. D. Nos. 56437 through 56443) 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 elevations increased at"the site an average of 0.39 feet during the fourth quarter ' of 2000. Ground water flow direction'is toward'the.south at the site. Hydrocarbon concentration's in groundwater generally decreased at the site between the September and December 2000 sampling events; but,appear to be within the normal range ; ' o£concentrations detected in'each well over time : r ; ' Fuel Ioxygenates.were not detected,in the'ground,water samples collected during the fourth ' gdarter,2000 monitoring event. ' 5.0. 'RECOMMENDATIONS ' Based upon data collected from the site, AGE recommends-continued quarterly monitoring of the ' site, the next-riion'itoring.eVeht is scheduled for March 2001. Concentrations of petroleum.,hydrocarbons have remained relatively stable over the past two years, 'i but are too high .to warrant' site closure. AGE is',preparing a ground water pump-and-treat remediation,work plan to mitigate the remaining hydrocarbons on-site. Advanced Ge6Envir0nmenta1,Inc.