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09 May 2003 <br /> • AGE-NC Project No 99-0559 <br /> Page 6 of 7 <br /> I 450 µg/1 and 180 µg/1, respectively The fuel additive MTBE was detected in samples CPT4-90, <br /> CPT6-100 and CPT8-100 at a maximum concentration of 2,600 gg/i(CPT4-90),ETBE and TAME <br /> were detected in CPT4-90 at 25 µg/1 and 5 6 µg/l, respectively, and TBA and DIPE were detected <br /> in CPT8-100 at 630 µg/1 and 18 µg/1, 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 µg/1, respectively BTEX <br /> compounds were not detected in the HU4 samples <br /> User HU5 <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 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 µg/1 <br /> (CPT6-125) No other analytes were detected in the Upper HU5 samples <br /> Lower HU5 <br /> Samples CPT5-150,CPT6-150,CPT7-150 and CPT8-165 were collected from Lower HUS The fuel <br /> additive TBA was the only analyte detected in the Lower HU5 samples, at a concentration of <br /> 180 µg/1 <br /> The laboratory reports (CTEL Lab I D 02010-002-01 to 3, 0210-024-1 to 4, 0210-034-1 to 4, <br /> 0210-027-1 to 4 and 0210-035-1 to 4 ) and chain-of-custody forms are presented in Appendix B <br /> Analytical results of the CPT "grab" ground water samples are summarized in Table 1 <br /> Analytical results of CPT "grab" ground water samples collected are depicted in petroleum-impact <br /> cross sectional views E-E' (Figure 3) The lateral distribution of MTBE in HU2,HU4 and HU5 are <br /> depicted in Figures 5 to 8 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected during this investigation, AGE concludes the following <br /> • The subsurface lithology is composed dominantly of silty fine sand, sandy slit, clayey silt to <br /> silty clay and clay Significant sand intervals were identified at between 50 and 60 feet bsg, <br /> between 90 and 110 feet bsg and between 165 and 170 feet bsg Based on the soil <br /> Idescriptions and CPT hydrologic information (pore pressure), AGE has identified six <br /> • hydrologic units (HU1 through HU6) <br /> Advanced GeoEuvironmental,Inc <br />