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21 November 1997 <br /> AGE-NC Project No 97-0312 <br /> Page 3 of 4 <br /> BTE&X were detected at concentrations as high as 8 5 ppm (benzene), 55 ppm (toluene), 35 ppm <br /> (ethylbenzene) and 140 ppm(xylenes). MTBE was detected in three samples collected beneath UST <br /> Nos 5 and 6 at concentrations as high as 17 ppm(T6-17),however confirmation of MTBE in sample <br /> T6-17 by EPA Method 8260 quantified MTBE at a concentration of 1.2 ppm <br /> Several volatile organic compound analytes were detected in soil samples collected from beneath <br /> the USTs by EPA Method 8260 at concentrations as high as 72 ppm Petroleum hydrocarbons were <br /> not detected beneath the west end of UST No 4, tert-butanol was detected beneath UST Nos 5 and <br /> 6 at concentrations as high as 6 1 ppm <br /> TPH-g and TPH-d were detected in piping/dispenser samples at concentrations as high as 1,200 ppm <br /> and 16,000 pprn,respectively BTE&X were detected at concentrations as high as 60 ppm(xylenes) <br /> Volatile organic compounds were detected beneath the piping samples at concentrations as high as <br /> 8 2 ppm Analytical results of UST and piping/dispenser soil samples are summarized on Tables 1 <br /> and 2 The laboratory report (MAI sample Nos 81029-81042) and chain-of-custody forms are <br /> included in Appendix B <br /> 4,0. SUMMARY AND CONCLUSIONS <br /> Based on the data obtained from the site, AGE concludes the following <br /> Petroleum hydrocarbons were detected in samples collected beneath each UST Neither the <br /> vertical nor the horizontal extent of impacted soil has been defined <br /> The lateral extent of petroleum hydrocarbons beneath the piping and dispensers area appears <br /> to be extensive However, the vertical extent may be limited due to a hard soil layer <br /> beginning at a depth of approximately four to five feet bsg <br /> Additional site investigation will be required to assess the lateral and vertical extent of <br /> impacted soil <br /> 5 0. RECOMMENDATIONS <br /> Based on the data obtained from the site, AGE recommends the following <br /> G The excavation should be backfilled and the stockpiled soil should be characterized for <br /> disposal and/or treatment <br /> c Following backfilling of the excavation, a work plan should be prepared to assess the lateral <br /> Advanced GeoEnvironmentaf,Inc <br />