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23 April 2001 <br /> AGE-NC Project No 96-0263 <br /> Page 4 of 5 <br /> MTBE was detected b EPA Method 8020 in the sample from CPT-2 at 39 to 43 feet bsg at a <br /> Y P <br /> concentrations of 5 8 �Lg/1 MTBE was confirmed by EPA Method 8260 in the same sample at a <br /> concentrations of 4 1 ag/l No other fuel oxygenated compound was detected in the ground water <br /> sample analysis Copies of the laboratory reports (MAI Lab I D 62523, 62525, 62528 and 62529) <br /> and chain-of-custody forms are in Appendix B Analytical results of the CPT "grab"ground water <br /> samples are summarized in Table 1 <br /> i <br /> 33 LABORATORY RESULTS OF SOIL SAMPLES <br /> A total of three soil samples (CPT2-35, CPT2-44 and CPT3-30) were collected from CPT-2 and <br /> fCPT-3 and submitted for laboratory analysis for the above mentioned constituents <br /> TPH-g was not detected in any of the soil sample collected BTEX compounds were detected in the <br /> soil sample collected from CPT-2 at 44 feet bsg at concentrations of 0 0060 mg/kg benzene, 0 012 <br /> img/kg toluene, 0 0053 mg/kg ethylbenzene and 0 022 mg/kg xylenes MTBE was detected by EPA <br /> Method 8260 in the same sample at 0 029 mg/kg No other fuel oxygenates were detected in the soil <br />� . sample analysis <br /> The laboratory reports (MAI Lab I D 62524, 62526 and 62527) and chain-of-custody forms are <br /> presented in Appendix B Analytical results of the CPT soil samples are summarized in Table 1 <br /> 4.0. SUMMARY AND CONCLUSIONS <br /> Based upon data collected on 12 March 2001, AGE concludes the following <br /> • Generally, the subsurface of the site from surface grade to approximately 60 feet bsg, was <br /> comprised of silt, sandy silt, clayey silt,silty clay and clay Poorly graded sand, gravelly sand <br /> and silty sand layers were encountered from approximately 12 feet to 16 feet, 19 feet to 20 5 <br /> feet and 39 feet to 40 feet bsg in boring CPT-1, from 13 feet to 17 feet and 37 feet to 43 feet <br /> bsg in boring CPT-2, from 12 feet to 25 5 feet and 39 feet to 42 feet bsg in boring CPT-3 and <br /> from 40 feet to 43 feet bsg in boring CPT-4 <br /> • TPH-g was not detected in any of the soil or ground water samples collected during this <br /> Iinvestigation <br /> • Very low concentrations of BTEX compounds were detected in the water samples collected <br /> from CPT-1 and CPT-2 Due to the very low concentration of BTEX compounds detected <br /> at 39 to 43 feet bsg,AGE believes that the plume of dissolved BTEX contamination does not <br /> . extend significantly below 43 feet bsg <br /> Advanced GeoEnvironmentai,inc <br />