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23 April 1999 AGE-NC Project No. 95-0100 ' Page 4 of 6 ' depth of 50 feet bsg also had detectable concentration of organic vapor. Soil collected from soil boring CB2 had significant concentrations of organic vapor from depths of 5 feet to 15 feet bsg. The boring logs are included as Appendix A. Stratigraphic cross sections are presented in Figures 3. 3.2. ANALYTICAL RESULTS OF SOIL SAMPLES TPH-g or BTEX compounds were detected in 13 of the 18 soil samples analyzed from the soil borings. TPH-g was detected at concentrations as high as 21,100 milligrams per kilogram (mg/kg) in soil boring CB2 at a depth of 10 feet bsg. TPH-g concentration in soil boring CBI decreased with depth from 5,200 mg/kg to 3,800 mg/kg to ' 5.4 mg/kg at 10 feet, 15 feet, and 20 feet bsg, respectively. TPH-g concentration also decrease with depth in soil boring CB2 from 21,000 mg/kg to 6,000 mg/kg to 35 mg/kg at 10 feet, 15 feet, and 20 feet bsg, respectively. ' BTEX was detected at concentrations u to 1 000 mg/k (xylene) in it boring B 1 t depth f p , g ( y } so gC at o ' 10 feet bsg. Xylenes were detected at a concentration of 4,400 mg/kg in soil boring C132 at a depth of 10 feet bsg. Benzene was detected in one of the soil samples,CB2-25, at a concentration of 0.006 mg/kg. The analytical results of soil samples are summarized in Table 1. The previously detected ' TPH-g and BTEX concentrations are compared to the post remedial soil samples in Table 2. Significant reductions of hydrocarbon concentrations were observed. The oxygenated fuel additive MTBE was detected in three soil samples analyzed; soil collected from boring CB I at depths of 45 feet and 50 feet bsg and soil collected from CB2 at 15 feet in depth. The greater concentration of MTBE detection was 22 mg/kg at depth of 15 feet bsg in soil boring CB2. The laboratory reports (MAI Lab ID 03454 through 03471), glxality assurance/quality control report (QA/QC) and chain-of-custody form are included in Appendix B. ' . 3.3. ANALYTICAL RESULTS OF `GRAB' GROUNDWATER SAMPLES ' TPH-g was not detected in the `grab' water sample collected and analyzed from boring CB 1. Three BTEX compounds were detected in the `grab' water samples analyzed; toluene, ethylbenzene and xylenes were detected at concentrations of 1.3 micrograms per liter (µg/1), 1.7 µg/l and 16 µg/l, respectively: . . . . �. ..._ w_ .. The oxygenated fuel additive MTBE was detected in water samples at concentration of 590µg/l by ' EPA Method 8020 and at a concentration of 790µg/I by EPA Method 8260 Modified.No other fuel additives were detected in the analysis of the water samples. Advanced GeoEnvironmental,Inc.