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26 May 1998 <br /> . AGE-NC Project No 96-0266 <br /> ' Page 8 of 9 <br /> - TPH-g was detected in grab water sample P22 collected below the former dispenser at a <br /> concentration of 100,000 parts per billion ppb(reported as micrograms per liter) TPH-g was <br /> also detected in sample P21 at 4,200 ppb and from P16 at a concentration of 3,400 ppb TPH- <br /> 1 g was detected in sample P20 collected north of the former east UST area <br /> THP-g was not detected ground water samples from P15, P17 , P18 P24a, P24b or P25 <br /> i ' - Benzene was detected sample P22 at a concentration of 140 ppb Benzene was also detected <br /> in lesser concentrations in samples P 16, P 17 and P 19 Toluene, ethyl benzene and xylenes <br /> were detected in sample P22 at a concentrations of 54, 300 and 1,700 ppb, respectively <br /> 1 BTE&X were also detected in other grab water samples analyzed at lesser concentrations <br /> - TPH-g was detected only in samples from ground water monitoring wells MW-1 and MW-5 <br /> ' at concentrations of 6,900 and 1,400 ppb, respectively <br /> - Benzene was detected only in ground water monitoring well MW-1 at a concentration of 420 <br /> ppb Toluene, ethyl benzene and xylenes were also detected in samples from monitoring <br /> wells MW-1, MW-5 and MW-6, at concentration as great as 270, 230 and 680 ppb <br /> respectively <br /> �• - MTBE was the only oxygenated compound detected in the water samples at the site MTBE <br /> was only detected in sample P19 at a concentration of 4,000 ppb MTBE was also detected <br /> in the water sample collected from well MW-4 at a concentration of 13 ppb <br /> Laboratory results of soil samples analyzed for petroleum hydrocarbons are summarized in Table <br /> I The laboratory reports (MAI Laboratory ID 83603 to 83611, 84842 to 84845, 84846 and 84847), <br /> ' QA/QC reports and chain-of-custody forms are included in Appendix F and F The approximate <br /> lateral extent of dissolved hydrocarbons is depicted on Figure 4 - Disvolved Hydrocarbons in <br /> Gr ound Water <br /> 1 <br /> ' 5.0. SUMMARY AND CONCLUSIONS <br /> Based upon the results of the subsurface trivestigation and historical research AGE concludes <br /> ' - Hydrocarbon-impacted soil in the area of the former West UST was encountered from depths <br /> of approximately 15 to 20 feet bsg Hydrocarbon-impacted soil was not encountered south, <br /> north or east of the former West UST area <br /> Hydrocarbons were detected in significant concentrations below the dispenser of the former <br /> East UST area Hydrocarbons were also observed to be distributed in soil below 15 bsg and <br /> above 20 feet bsg <br /> . - The detection of MTBE by EPA method 8260m 1n soil collected from beneath the dispenser <br /> i <br />