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At least two soil sample were collected (in steel and acetate tubes) from each boring for submittal <br /> ' to Argon Mobile Labs in Ceres, California (Certification No 1873) using chain-of-custody <br /> documentation The samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) <br /> ' and benzene, toluene, ethylbenzene and xylenes (BTEX) by EPA methods 8015 (modified) and <br /> 8020, respectively Cop=es of chain-of-custody records and laboratory reports are presented to <br /> Appendix H <br /> During grouting activities, floating product was observed in boring SB-2 <br /> RESULTS OF INVESTIGATION <br /> Site Geology <br /> ' Site boring logs and sediments encountered while drilling indicate that the shallow soil under the <br /> site consists of silt and clay Groundwater was encountered in the bonngs at approximately 12 <br /> ' feet bgs Descriptions of soil encountered during drilling, and depths to groundwater are <br /> presented in the boring logs in Appendix I <br /> ' Analytical Results - Soil <br /> The results of laboratory analyses of the soil samples collected from the bonngs indicate that <br /> ' TPHg and BTEX were detected above method detection limits in shallow soil samples collected <br /> in bonngs SB-1, SB-2, and SB-3 TPHg was detected in bonngs SB-1, SB-2 and SB-3 TPHg <br /> was detected in SB-1 at 10 feet [21 parts per million (ppm)] and 15 feet (120 ppm), in SB-2 at 10 <br /> feet (74 ppm), and in SB-3 at 10 feet (150 ppm) and 15 feet (94 ppm) Benzene was detected in <br />' only two borings, SB-1 and SB-3 Benzene was detected in SB-1 at 15 feet (0 30 ppm), and in <br /> SB-3 at 10 feet (0 11 ppm) and 15 feet (1 2 ppm) Toluene, ethyl benzene and xylenes were <br />' detected in SB-1 at 15 feet, SB-2 at 10 feet, SB-3 at 10 feet, and SB-3 at 15 feet at low <br /> concentrations Method detection limits of samples SB-1 at 10 feet, SB-2 at 10 feet, and SB-3 at <br />' 15 feet were higher(0 025 ppm and 0 I0 ppm) due to a dilution factor This may have resulted in <br /> some BTEX constituents being reported as nondetectable in these samples Petroleum <br /> constituents were not detected in any of the samples analyzed from boring SB-4 PID readings <br /> %r%433*nep"\wbrpt.dm 4 <br /> • <br />� SMTH <br />