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26 February 2001 <br /> AGE-NC Project No 95-0137 <br /> Page 3 of 4 <br /> ' ranging from 110 µg/l in samples MW-4 and VW-1B to 51,000 µg11 in MW-3 <br /> Benzene was reported in wells MW-1, MW-2, MW-3, VW-1 B and VW-2A t concentrations ranging <br /> ' from 0 88 µg11 in MW-3 to 1,000 µg11 in MW-2 Toluene, ethylbenzene and/or xylenes were also <br /> reported in five wells at concenti ations ranging from 0 55 µg11 of toluene in MW-3 to 840 µg/l of <br /> ethylbenzene in V W-1 A <br /> ' MTBE was not detected above reporting limits in any of the samples utilizing EPA method 8020 <br /> Utilizing EPA method 8260, MTBE was reported in ground water samples MW-2 and MW-3 at <br /> ' concentrations of 2 9 gg/l and 1 9 µg11, respectively <br /> 4 <br /> Samples MW-1 through MW-4,VW-2A and VW-213 contained TBA at concentrations ranging from <br /> 9 9 µg/l in VW-2A to 360 µg11 m VW-2B DIPE was reported in the ground water sample collected <br /> fi om well MW-3 by EPA method 8260 at a concentration of 1 9 µg/l ETBE and TAME were not <br /> reported in any of the samples <br /> The analytical results are summarized in Tables 2 and 3 A copy of the laboratory report (MAI Lab <br /> ID Numbers 52460 thiough 52467), quality assurance and quality control (QA/QC) and chain-of- <br /> custody form are Included in Appendix B <br /> ' 4.0. CONCLUSIONS <br /> ' Based on the data collected during this monitoting period, AGE concludes <br /> • The greatest concentrations of dissolved petroleum hydrocarbons in the shallow ground water <br /> ' is centered ai ound the former UST excavation, however, high concentrations of TPH as <br /> diesel fuel are also present in MW-3, located approximately 85 feet east of the former UST <br /> excavation In general, the concentrations of hydrocarbons has Increased since the last <br /> ' sampling event in January 2000 <br /> • Analytical results of ground water samples collected from the air sparging wells (VW-1B, <br /> VW-213), screened between 30 and 35 feet bsg, Indicate that the hydrocarbon-impacted <br /> ' ground water extends at least 15 feet into the saturated zone <br /> • MTBE, reported at very low concentrations in MW-3 and VW-IA Is not widespread nor a <br /> ' significant concern at this time TBA has been detected at several locations on the site No <br /> other fuel oxygenates were detected during this sampling event <br /> Advanced Geo Environmental,lice <br /> 1 <br />