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I 01 November 2000 AGE-NC Project No 95-0173 IPage 5 of 6 I BTEX compounds were detected in the samples from MW-13 at depths between 25 and 95 feet bsg at concentrations ranging as high as 51 mg/kg The greatest benzene concentration was detected from the 35-foot and the 50-foot samples at a concentration of 14 mg/kg No fuel oxygenated compounds were detected by laboratory analysis The analytical results of the selected soil samples are summarized in Table 1 The laboratory reports (Castle Analytical I Laboratory Reference No 3172 and McCampbell Analytical Inc Lab I D No 45872 through 45880) and chain-of-custody forms are included in Appendix C 3 4 ANALYTICAL RESULTS OF GROUND WATER SAMPLES TPH-g was detected in the ground water sample collected from well MW-13 at a concentration of 13,000 micrograms per liter (µg/1), TPH-d was detected at a concentration of 2,100µg/l, however the laboratory reported the TPH-d sample chromatograms as not having a typical diesel pattern r Toluene and xylene were detected in the ground water sample at concentrations of 2 000 1 while Y � P � µ� , ' benzene and ethylbenzene were detected at concentrations of 400 1,ig/1 MTBE was not detected by the EPA 8020 analysis I None of the fuel oxygenated compounds were detected by the EPA 8260 analysis Analytical results of the MW-13 ground water sample analysis are summarized in Table 2 The laboratory reports (Castle Analytical Laboratory Reference No 3216 and McCampbell Analytical Inc Lab I D 47855) Iand chain-of-custody forms are presented in Appendix D 4.0. DISCUSSION AND CONCLUSIONS The implications from installation activities of ground water monitoring well MW-13 are as follows ISaturated soil at the site was encountered at approximately 25 feet bsg The static water level was measured at approximately 25 feet below the top of the monitoring well casing - A airy line aand was eiiirvuiit%rCd at d�YuiS of iv aiid i5 iLirt bSg uilderiniii by a Ciayey Siit at 20 feet bsg A silty fine sand was encountered at depths between 25 and 75 feet bsg underlain by a clayey silt at depths between 80 and 100 feet bsg General lithology beneath the site is depicted in cross sectional view A -A'on Figure 3 Impacted soil was encountered at depths between 25 and 95 feet bsg The greatest petroleum- impact to soil was encountered at 25 feet bsg, moderate petroleum-impact was encountered at depths between 35 and 65 feet bsg, low petroleum-impact was encountered at depths Advanced GeoEnvironmental,Inc