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I � <br />;I <br /> ` All soil, groundwater, and decontamination water generated during this scope of work were stored on <br /> site in drums pending analytical results. All borings were closed by tremie grouting in accordance with <br /> San Joaquin County requirements. Tremie grouting activities were observed under the supervision of the <br /> SJCEHD. <br /> ' <br /> 5. 2. 1 Laboratory Analyses <br /> ( <br /> Soil boring samplesere analyzed for TPH-g and TPH-k by EPA method 8015M, and BTEX and MTBE by <br /> gg1Gv <br /> EPA Method $D21 . est pit samples were analyzed for TPH-k and TPH-g by EPA method 8015M, BTEX by <br /> -_. EPA Method 8021, and total lead by EPA Method 6010. <br /> Groundwater samples were analyzed for TPH-k and TPH-g by EPA method 8015M, BTEX and fuel <br /> oxygenates including tert-butyl alcohol (TBA), Methyl-tert butyl ether (MTBE), and Di-isopropyl ether <br /> � 1 <br /> (DIPS), Ethyl tert-butyl ether (ETBE) and tert-Amyl methyl ether (TAME), 1,2 Dichloroethylene (1,2 DCA) <br /> and Ethyl di-bromide (EDB) by EPA Method 8260. - - <br /> I <br /> -- In addition, shallow groundwater samples from SB-4 and SB-5 in the first phase of the Site investigation <br /> were analyzed for methanol and ethanol by EPA 8015M. Following review of the data these analytes <br /> l � <br /> were eliminated from the sampling program. <br /> 5.3 Investigation Results <br /> Tables 1 and 2 summarize the analytical results for soil and groundwater respectively. Appendix B <br /> ` . ) contains laboratory analytical reports. 11 ;d a r- A7k tet" `I S r?? rSSi'Y . <br /> r � <br /> 5.3.1 Soil Results <br /> Two separate evaluations of soil contamination were performed . Soil borings were drilled to assess <br /> ( � subsurface contamination and shallow test pits were dug to assess surface soil contamination . <br /> ( l <br /> ( ? 5.3. 1. 1 Soil Borings <br /> The highest concentrations of TPH-g were encountered in boring SB-2 at 38.5 feet, SB-3 at 59. 5 feet and <br /> S134 at 59. 5 feet bgs. For these samples, concentrations ranged between 2,600 milligrams per kilogram <br /> (mg/kg) in SB-4 to 4,300g/kg in SB-2. The remaining TPH-g concentrations ranged between 64 mg/kg <br /> in SB-Sb at 54 feet bgs to 1,600 mg/kg in SB-2 at 21 .5 feet bgs. In SB-6 and 56-7, TPH-g was not <br /> j <br /> t 7 <br /> U 25971201 , DGD 6 February 2008 <br />