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r <br /> 16 November 1998- <br /> AGE-NC-Project N6.97-0351 <br /> A` Page 3-of 4 <br /> r TPH-d was detected in the samples from ground watermonitoring wells MW-1-and MW-2 <br /> at concentrations of 1,800 µg/l and 150 µg/1, respectively. The other samples were not <br /> analyzed for TPH-d. <br /> • <br /> Toluene,ethyl benzene and xylenes were also detected in the sample from monitoring well " <br /> MW-.l at concentration of 51µg/1,.180 ugll and 480 µg/l, respectively. Toluene was also <br /> F -detected in the ground water sample from MW'5 ata concentration of 0.59µg/l. <br /> MTBE was the only oxygenated compound detected in the water samples at the site. MTBE <br /> was detected by EPA Method 8260 in'the samples,from wells MW-2.and MW-4 at <br /> 4 concentrations of 1.8 µg/l and 10 4' gll, respectively. <br /> Laboratory results of.samples analyzed for petroleum hydrocarbons are summarized in Table.2 and. <br /> - Table 3: The laboratory reports (MAI Laboratory ID 92843 through 92848), quality assurance and <br /> quality control (QA/QC)reports and chain-of-custody form is included in Appendix B. <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of the,subsurface investigation, AGE:concludes: <br /> t <br /> a The greatest concentrations of dissolved petroleum.hydrocarbons were detected in samples <br /> collected from MW=1,.near.the former West UST location:Hydrocarbons were not detected <br /> down-gradient of the.West UST area. . <br /> • Diesel-impacted ground water was present in the southwest portion of the site,.however as <br /> noted in previous reports, has found no records of diesel use on the site and none of the <br /> vadose zone soil samples analyzed were impacted with diesel.:The origin of the TPH-d may. <br /> -be from the petroleum'transfer station formerly on the property west of the site- <br /> 5.0. RECOMMENDATIONS <br /> Based on the results of this investigation;AGE'recommends: <br /> • Continued quarterly ground water monitoring. The next monitoring even_ t is scheduled for <br /> November 1998. <br /> •: Installation of additional ground water monitoring wells located east'and.south of the Eastern <br /> .UST for lateral delineation of the dissolved hydrocarbons at the site. <br /> A6&irced GeoEnvironmental,Inc. <br />