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1 <br /> A S S O C I A T E S I N C <br /> 11 Soil Sample Analysis <br /> ' Soil samples were immediately placed on ice and selected soil samples were analyzed by <br /> Sequoia Analytical (ELAP #1210) of Redwood City, California for total petroleum hydrocarbons <br /> ' as gasoline, (TPHg) by EPA method 8015 modified, benzene, toluene, ethylbenzene, and xylenes <br /> (BTEX), and oxygenate fuel additives by EPA method 8260 The analytical results for soil <br /> samples are summarized in Table 1 Laboratory data sheets and chain-of-custody documentation <br /> ' are included in Appendix B <br /> ' 24 Grab Groundwater Sampling and Analysis <br /> On March 3, 1999, grab groundwater samples were collected from borings SB 10 and SB 11 The <br /> ' samples were collected after encountered groundwater in each boring had been allowed to <br /> stabilize The grab groundwater samples were collected using dedicated clean disposable bailers <br /> ' with bottom emptying devices to reduce volatilization Sample containers were then labeled <br /> with sample identification, placed on ice, and shipped under chain-of-custody to Sequoia The <br /> grab groundwater samples from borings SB 10 and SB 11 were analyzed by Sequoia for TPHg, <br /> BTEX, and oxygenate fuel additives Groundwater analytical results are summarized in Table 2, <br /> and laboratory data sheets and chain-of-custody documentation are included in Appendix B <br /> ' 3 0 SUBSURFACE CONDITIONS <br /> ' Soil encountered in borings SB 10 and SB11 consisted of lean clay from the surface to 11 5 to 15 <br /> feet bgs Soil consisted of varying amounts of silt and sand from depths between 11 5 to 15 feet <br /> bgs to 415 to 45 feet bgs Soil in boring SB 10 consisted of lean clay from depths between 415 <br /> to 45 feet bgs and 46 5 feet bgs Soil in boring SB11 consisted of elastic silt from depths <br /> between 41 feet bgs and 46 5 feet bgs <br /> ' Soil in boring S139A consisted of clay with varying amounts of sand from the surface to 17 5 feet <br /> bgs Soil from depths between 17 5 feet bgs and 25 feet bgs consisted of silt with varying <br /> ' amounts of sand Soil from depths between 25 feet bgs and 27 5 feet bgs consisted of lean clay <br /> with sand Soil from depths between 27 5 feet bgs and 36 5 consisted of varying amounts of silt <br /> ' and sand Soils from depths between 36 5 feet bgs and 42 5 feet bgs consisted if sandy silt and <br /> elastic silt Soil from depths between 42 5 feet bgs and 44 feet bgs consisted of poorly graded <br /> sand Soil from depths between 44 feet bgs and 65 feet bgs consisted of clay with a layer of silty <br /> ' sand between 61 feet bgs and 61 5 feet bgs consisted of silty sand <br /> w%62596Veportslph1n doe 4 <br />