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1 10 December 2001 AGE-NC Project No 00-0769 ' Page 4 of 6 ' 02 at a depth of 99 feet bsg to X103 feet bsg (sample collected outside an identified water zone) - contained TPH-g at a concentration of 810 µg/l ' Benzene, toluene, ethylbenzene and/or total xylenes were detected in,27 of the 29 ground water samples at concentrations as' high as 33,000 µg/l, 30,000 µg/I, 2,700 µg/1 and 14,000 µg/l, respectively The greatest BTEX concentrations were detected in CPT-06 samples collected from ' the First Water-Middle Zone Benzene was detected in one of the two samples collected from the First Water - Upper Zone, CPT-01 at a concentration of 1,200 micrograms per liter (µg/1), the CPT-02 sample was non-detect Benzene was detected in all four samples collected from First Water MiddleZone at concentrations ranging from 24µg/1(CPT-01)to 33,000 fig/1(CPT-06,located near former USTs No 1 and No 2), in nine samples collected from the First Water - Louver Zone at ' concentrations ranging from 42 µg/1 (CPT-03) to 30,000 µg/l (CPT-06), in five of the six samples collected from the Second Water Zone�at concentrations raning from 2 5 µg/l(CPT-02) to 680 µg/1 (CPT-05, located near the former UST No 3), the CPT-3 sample was non-detect Concentrations ' of benzene were detected in the six samples collected from the Third Water Zone ranging from 2 2 µg/l (CPT-03) to 3,900 µg/l (CPT-05), and in the one sample collected from the Fourth Water Zone at a concentration of 8600 M/1(CPT-06) One sample collected from CPT-02 at a depth of 99 feet bsg to 103 feet bsg (sample collected outside an identified water zone) contained berizerie at a concentration of 91 µg/l ' MTBE, ETBE, TAME, TBA, methanol, ethanol and EDB were not detected in any of the 29 water samples DIPE was detected by EPA Method 8260 in one CPT-04 water sample collected from First ' Water-Lower Zone at a concentration of 6 1 4g/1 1,2-DCA was detected in samples collected from borings CPT-02, CPT-03, CPT-04, CPT-05 and CPT-06 at concentrations as high as 2,700 µg/1 ' _ The laboratory reports(McCampbell Analytical Inc Lab IDs 74812 through 74816;74817 through 74821, 74992 through 74995, 75277 through 75282, 75578 through 75581 and 75571 through 75575) and chain-of-custody forms are presented in Appendices B through G Analytical results of ' the ground water samples are sumniarized in Tables 1 and 2, Figures 6 through 26 illustrate the horizontal and vertical extent of petroleum hydrocarbon-impacted ground water ' 3.0. SUMMARY AND CONCLUSIONS The summary of the August 2001 CPT investigation results follows • Physical parameters of soil encountered in the CPT borings indicate that permeable lithology primarily consisting of sand to silty'sand and silt occurs at depths between 112 feet and 125 feet bsg and between 139 feet and 155 feet bsg Locally lithology varied from sand to silt at depths between 60 feet and 70 feet bsg and between 85 feet and 103 feet bsg Clayey silt, silt Advanced GeoEnvi ronmental,Inc