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S a y 30 August 1999 AGE-NC Project No 97-0312 Page 5 of 8 i y I t ti During drilling of B14, ground water was not present in the boring immediately_prior to collection of the soil sample at 65 feet bsg Ground water was present after drilling to a depth of 70 feet bsg After drilling to a depth of 65 feet bsg in boring B 15, ground water was measured at a depth of 60 feet bsg A continuous core sampler was used during the drilling of B 16 Free water was not observed prior to collection of a sample at 80 feet bsg, although thin sand lenses, ricountered at shallower depths, may have contained free water I - 3 2 ANALYTICAL RESULTS OF SOIL SAMPLES r Organic vapor was detected in 20 of the 76 samples collected from borings B14 through B17 at concentrations as high as 817 ppm (B14 at 15 feet bsg) Organic vapor was not detected in soil samples collected from boring B16 from boring B15 below a depth of 30 feet bsg or from boring B 17 below a depth of 45 feet bsg PID readings are summarized on Table 1 TPH-g was detected in samples B14-20 and Bl5-15 at concentrations of 570 parts per million (ppm, reported as milligrams per kilogram) and 540 ppm, respectively TPH-d was detected in six of the 24 samples analyzed (B14-20, B 14-30, B 15-15, BI 5-20, B17-25 and BI 7-40) at concentrations as high as 13,000 ppm (B 14-20) Benzene was detected in sample B 14-20 at a concentration of 4 1 ppm Toluene, ethylbenzene and xylenes were detected in samples B14-20 a yid B15-15 at concentrations as high as 9 8 ppm Other petroleum hydrocarbons were not detected in the 24 soil samples analyzed MTBE was detected by EPA Method 8260 in samples B 14-20, B 17-25 and B 17-40 at concenti ations 4 of 0 41`ppm, 12 ppm and 8 1 ppm, respectively Tert-butanol was detected in sample B 14-20 at a concentration of 0 3 ppm Other oxygenates -,N ere not detected in these three samples of in sample I B15-15 MTBE was detected by EPA 'Method 8015m in samples 1314-30 and B17-50 at concentrations of 0 051 ppm and 0 54 ppm respectively 'Analytical results of soil samples are sununarized on Tables 2 and,3 The laboratory report (MAI Sample Nos 13178-13201) and chain- of-custody forms are included in Appendix B r ' Y i Petroleum hydrocarbons were not detected in soil samples collected from B16, limiting the northern extent of impacted soil Petroleum hydrocarbons were not detected below p } ted b to a depth of 40 feet bsg in the remaining borings, defining the vertical extent of,nripacted soil at these locations Petroleum hydrocarbons were previously not detected in borings UST-2, UST-3 and UST-4,defining the northwestern,' northeastern and southeastern extent of impacted soil Petroleum hydrocarbons were detected at depths as great as 85, 55 and 50 feet bsg in borings UST-I UST-5 and 50 feet, respectively Petroleum hydrocarbons were not detected at depths greater than 30 feet in the remaining borings Atli anted GcoEm ironmental Inc I 4 ,