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e' <br /> A S S O C I A T E S I N C <br /> Following soil and groundwater sample collection, the borings were backfilled with neat cement <br /> grout to the ground surface <br />' 2.2 Soil Sample Analysis <br /> p Y <br />' Soil and groundwater samples from the borings were placed on ice and transported under chain- <br /> of-custody protocol to Argon Laboratories in Ceres, California Soil samples from borings S1311, <br />' SB 12, SB 13, SB 14, and SB 15 were analyzed for TPHg and total petroleum hydrocarbons as <br /> diesel (TPHd) by EPA method 8015 modified, BTEX by EPA method 8020, methyl tertiary butyl <br /> ether (MTBE), 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA), and additional <br /> oxygenate fuel additives including tertiary amyl ether (TAME), di-isopropyl ether (RIPE), ethyl <br /> tertiary butyl ether (ETBE), and tertiary butyl alcohol (TBA) by EPA method 8260B <br /> 2.3 Groundwater Sampling and Analysis <br /> One groundwater sample was collected from each boring at the depth groundwater was first <br /> 1 encountered, approximately 5 to 19 feet bgs A Geoprobe® Screen Point 15 Groundwater <br /> Sampler will be threaded onto the leading end of the Geoprobe when the desired groundwater <br /> sampling depth is reached While the sampler was advanced, O-ring seals and an expendable <br /> drive point provided a watertight system to ensure sample integrity <br /> When the tool has been advanced to the desired depth, extension rods were sent downhole to <br />' brace the bottom of the sample screen as the tool casing was retracted When the casing was <br /> retracted, up to 41-inches of screen with slot sizes of 0 004 inches was exposed Teflon tubing <br /> with a check valve attached to one end was inserted down the casing until it was immersed in <br />' groundwater Water was then pumped through the tubing and to the ground surface by <br /> oscillating the tubing up and down <br /> Groundwater samples from borings S1311, SB 12, SB 13, SB14, and SB 15 were analyzed for <br /> TPHg and TPHd by EPA method 8015 modified, BTEX by EPA method 8020, and MTBE, <br />' EDB, 1,2-DCA, and additional oxygenate fuel additives including TAME, DIPE, ETBE, and <br /> TBA by EPA method 8260B <br />' 3.0 SUBSURFACE CONDITIONS <br /> 3.1 Geology <br /> 1 The soils beneath the site generally consisted of silty clays, organic silty clays from the surface to <br /> a depth of about 24 feet below grade At 24 to 26 feet below grade, the maximum depth <br /> advanced, fine sands and sandy silts were encountered Boring logs containing more detailed <br /> descriptions can be found in Appendix A <br />' W\wordpw\25803\sub_mv doe 3 <br />