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CAMBRIA <br /> Boring Depths Borings SB-4 and SB-6 were drilled to 120 fbg Boring SB-5 <br /> was drilled to 88 fbg, and well S-4 was drilled to 61 5 fbg We <br /> intended to drill boring SB-5 to 120 fbg, but the CPT rig could <br /> not drill past dense soil encountered at 88 fbg <br /> Groundwater Depths Groundwater was observed during drilling activities at <br /> approximately 51 5 fbg (Table 1) in S-4 A pore pressure <br /> dissipation test was performed with the CPT equipment in <br /> borings SB-4 and SB-6 This test is used to determine depth to <br /> groundwater in the boring The depth to groundwater in SB-6 <br /> was calculated to be approximately 51 5 fbg The test results <br /> for boring SB-4 were inconclusive The pore pressure <br /> dissipation test was not performed in boring SB-5 Therefore, <br /> depth to water data for borings SB-4 and SB-5 are not <br /> available <br /> Sediment Lithology Lrthology encountered while drilling well S-4 generally <br /> . consisted of clay from the surface to approximately 10 fbg, <br /> underlain by silty sand to approximately 35 fbg, underlain by <br /> silt to the total depth explored of 61 5 fbg The CPT boring <br /> lithology generally consisted of silt and clay from the surface <br /> to 15 to 24 fbg, underlain by silty sand and sand to a depth of <br /> approximately 28 to 31 tbg, underlain by silt and clay This <br /> second silt and clay layer extended to a depth of <br /> approximately 69 to 72 fbg, where a coarser-grained unit was <br /> encountered, consisting mostly of silty sand, sand, and <br /> gravelly sand with minor intermittent layers of silt This unit <br /> extended to approximately 86 to 87 fbg Beneath this layer, <br /> silt was encountered to depths of approximately 108 to 109 <br /> fbg, where another sand and gravelly sand layer was <br /> encountered This sand and gravelly sand layer extended to <br /> approximately 112 fbg Silt was encountered below to the <br /> total depth explored of 120 fbg <br /> Chemical Analyses: Soil samples from well S-4 and from borings SB-4, SB-5, and <br /> SB-6 were analyzed for TPHg by EPA Method 8015 <br /> (modified), BTEX and MTBE by EPA Method 8020 <br /> Additionally, selected soil and all groundwater samples were <br /> 0797 4 <br />