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25 January 2005 <br /> AGE-NC Project No 99-0559 <br /> Page 8of12 <br /> in CPT8-100 at 630 µg/1 and 18 µg11, respectively In addition, the solvent TCE was detected in <br /> samples CPT5-100 and CPT8-100 at concentrations of 5 2 µg/1 and 9 1 4g11, respectively BTEX <br /> compounds were not detected in the HU4 samples <br /> HU55 Unper <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/1, 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 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 µg/1 <br /> • 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 /> HU2 <br /> • Fuel additives were detected in all hydrologic units The highest concentrations were detected <br /> in HU4,MTBE was detected in HU4 at a maximum concentration of 2,600 µg/1,ETBE and <br /> TAME were detected at 25 µg/1 and 5 6µg/1,respectively,and TBA and DIPE were detected <br /> at 630 µg/1 and 18 µg/1,respectively However, only TBA was present in Lower HU5, at a <br /> concentration of 180 µg/1 HU4 is a thick poorly graded sand layer encountered at <br /> approximately 90 to 110 feet bsg MTBE is apparently migrated laterally within this unit, <br /> 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 bonngs CPT-5 and CPT-8 <br /> (Figure 2), at a maximum concentration of 1,700 µg/1 The TCE appears to ongmate from <br /> an off-site source, since TCE was not detected in CPT bonngs (e g, CPT-4 and CPT-6) <br /> closer to the site <br /> Advanced GeoEnvironmental,Inc <br />