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' 18 5.3 FIELD SOIL CHEMICAL ANALYTIC RESULTS TPHg was detected in soils at three different depths in boring NP-1 Concentrations detected were 13 mg/kg at 40 feet bgs, 50 mg/kg at 50 ft bgs, and 290 mg/kg at 60 ft bgs ' TPHg was not detected , at a detection concentration level of less than 005 mg/kg, in three ' successive samples taken from the 70, 80 and 90 foot bgs depths ' BTEX compounds were detected in soil samples collected at the same three depth intervals Benzene concentrations were 078 mg/kg at 40 ft bgs, 1 1 mg/kg at 50 ft bgs, and ' 5 8 mg/kg at 60 feet bgs Toluene and total xylenes were detected at the 70 foot bgs. level at concentrations of 018 mg/kg and 017 mg/kg, respectively All BTEX compounds were ' otherwise nondetect, at a detection concentration level of less than 005 mg/kg, in three successive samples taken from the 70, 80, and 90 foot bgs depths Methyl tertiary-butyl ether ' (MTBE)was nondetect in all soil samples collected at all depths Results for soil sampling conducted with the Sunulprobe and analyzed in the on-site mobile laboratory are summarized in Table 5-1 and illustrated on Figure 5-1 Detailed mobile laboratory results, fixed-lab MTBE confirmation results, QA/QC records, and Chani of Custody records for the field soil sampling results are included in Appendix G 5.4 FIELD GROUNDWATER CHEMICAL ANALYTIC RESULTS Attempts were made to collect groundwater samples at 10 foot depth intervals ' between 30 and 90 feet bgs,inclusive Samples were successfully collected at the depths of 50, 60, and 70 feet bgs Insufficient quantities of water were collected, over the 25 nwiute ' collection time period, at the deeper sample depths (80 and 90 ft bgs) attempted Concentrations of TPHg in water samples were 200,000 ug/L at the 50 foot depth, ' 170,000 ug/L at the 60 foot depth, and 36,000 ug/L at the 70 foot depth BTEX compounds were detected to the water samples collected from the 50, 60, and 70 foot depths