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