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CAMBRIA <br /> Boring Depths. 41 5 to 65 0 fbg <br /> Groundwater Depths Groundwater was encountered at 50 fbg in Borings SB-3 and <br /> SB-4 <br /> Sediment Lithology Lithology encountered while drilling the borings consisted of <br /> silt (ML) to depths of approximately 12 to 18 fbg, underlain <br /> by alternating layers of sand (SP) and silt (ML) to depths of <br /> approximately 42 to 47 fbg, underlain by silty sand (SM) to <br /> depths of approximately 54 to 56 fbg, underlain by silt (ML) <br /> to the total explored depth of 61 5 fbg (Appendix B) <br /> Soil Analyses Selected soil samples from Borings SB-1 through S13-5 were <br /> analyzed for TPHg by EPA Method 8015 (modified), <br /> benzene, toluene, ethyibenzene, xylenes (BTEX), and MTBE <br /> by EPA Method 8020, and fuel oxygenates by EPA Method <br /> 8260 <br /> Groundwater Analyses Groundwater samples were analyzed for TPHg, BTEX, <br /> MTBE, and fuel oxygenates <br /> Soil Disposal All soil generated during field activities was stored onsite and <br /> covered with plastic sheeting The soil stockpile was sampled <br /> and profiled for disposal On February 17, 1999, Manley and <br /> Sons Trucking, Inc of Sacramento, California transported <br /> approximately 3 tons of soil to Forward, Inc 's Manteca, <br /> California landfill <br /> Backfill Method Borings SB-1 through SB-5 were backfilled with cement grout <br /> and completed to the surface with concrete <br /> HYDROCARBON DISTRIBUTION IN SOIL <br /> TPHg was detected only in Boring SB-1 at a depth of 40 5 fbg at a concentration of 3 17 <br /> ppm No benzene was detected in any of the soil borings MTBE was detected in the soil <br /> borings at concentrations ranging from 0 00807 to 92 9 ppm The soil chemical analytical <br /> 241-0955 3 <br />