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• 25 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 8 of 12 <br /> samples CPT5-100 and CPT8-100 at concentrations of 5 2 µg11 and 9 1 µg11, respectively BTEX <br /> compounds were not detected in the HU4 samples <br /> HU5 Upper <br /> Samples CPT4-120, CPT5-130, CPT6-125, CPT7-130 and CPT8-125 were collected from Upper <br /> HU5 TPH-g was detected only in sample CPT6-125 at 190 µg/l, and the fuel additive MTBE was <br /> detected in samples CPT4-120, CPT6-125 and CPT8-130 at a maximum concentration of 91 µg/1 <br /> (CPT6-125) No other analytes were detected in the Upper HU5 samples <br /> HU5 Lower <br /> Samples CPT5-150,CPT6-150,CPT7-150 and CPT 8-165 were collected from Lower HU5 The fuel <br /> additive TBA was the only analyte detected in the Lower HU5 samples, at a concentration of <br /> 180 gg/l <br /> • TPH-g was detected is ground water samples collected In HU2, HU4 and Upper HU5, the <br /> maximum concentration was 2,000 µg11 in HU4 BTEX compounds were detected only in <br /> HU2 <br /> • Fuel additives were detected in all hydrologic units The highest concentrations were <br /> detected in HU4, MTBE was detected in HU4 at a maximum concentration of 2,600 µg/1, <br /> ETBE and TAME were detected at 25 gg/l and 5 6 µg11, respectively, and TBA and DIPE <br /> were detected at 630 gg/l and 18 gg/l, respectively However, only TBA was present in <br /> Lower HU5, at a concentration of 180 µg11 HU4 is a thick poorly graded sand layer <br /> encountered at approximately 90 to 110 feet bsg MTBE is apparently migrated laterally <br /> within this unit, especially off-site towards the west <br /> • Dissolved MTBE extends off-site past all current sampled locations The concentrations of <br /> dissolved MTBE decreased away from the site, except to the west at CPT4, the highest <br /> concentration of MTBE detected off-site <br /> • The vertical extent of dissolved TPH-g, benzene and MTBE does not extend to below <br /> 130 feet bsg <br /> • The solvent TCE was detected in HU2 and HU4 in the off-site borings CPT-5 and CPT-8 <br /> (Figure 2), at a maximum concentration of 1,700 gg/l The TCE appears to originate from <br /> an off-site source, since TCE was not detected in CPT borings (e g , CPT-4 and CPT-6) <br /> closer to the site <br /> Computer generated CPT soil descriptions augmented with previously obtained soil sample and CPT <br /> • Advanced CeoEnvlronmental,Inc <br />