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1 <br /> 25 1 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 8of12 <br />' samples CPT5-100 and CPT8-100 at concentrations of 5 2 gg/l and 9 1 /1 respectively BTEX <br /> gg p Y <br /> compounds were not detected in the HU4 samples <br /> 1 <br /> HU5 Upper <br />' Samples CPT4-120, CPT5-130, CPT6-125 CPT7-130 and CPT8-125 were re collected from Upper <br /> HU5 TPH-g was detected only in sample CPT6-125 at 190 gg/l, and the fuel additive MTBE was <br /> detected in samples CPT4-120, CPT6-125 and CPT8-130 at a maximum concentration of 91 µg11 <br /> (CPT6-125) No other analytes were detected in the Upper HU5 samples <br /> IHU5 Lower <br /> I Samples CPT5-150, CPT6-150, CPT7-150 and CPT8-165 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 /> lie • TPH-g was detected is ground water samples collected in HU2, HU4 and Upper HU5, the <br /> maximum concentration was 2,000 µg/1 in HU4 BTEX compounds were detected only in <br /> IHU2 <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 gg/l, <br /> ETBE and TAME were detected at 25 gg/I and 5 6 gg/l, 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 µg/l HU4 is a thick poorly graded sand layer <br /> I 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 /> I (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 GeoEnvironmental,Inc <br />