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top of the warehouse's foundation slab This total depth was based on <br /> the suggestion of the PHD/EHD representative present on site to take <br /> into account the elevation difference between the top of the foundation <br /> slab and the average ground surface in areas exterior to the warehouse <br /> building Soil samples were collected by cutting the liner with a <br /> ' decontaminated knife and capping the ends of the liner with Teflon <br /> sheets and plastic end caps The samples were stored on ice during <br /> transport to the laboratory <br /> Soil borings S2-B1, S2-B2 and S2-B4 were g e e drilled and sampled on <br /> September 28, 1994 The borings were located within the former <br /> ' excavation footprint and drilled to total depths of 15 feet bgs Soil <br /> samples were collected using a spit-spoon drive sampler containing 6- <br /> inch-long brass sample tubes Soil samples were screened using a PID <br /> during sample collection The PID readings are included in the <br /> driller's logs in Appendix B Soil samples were collected from three <br /> depth intervals from borings S2-B2 and S2-B4 Soil samples were <br /> collected from boring S2-BI at two depth intervals The ends of the <br /> brass tubes were covered with Teflon sheets and plastic end caps and <br /> stored on ice during transport to the laboratory <br /> Investigation Results <br /> The following sections present a summary of the post excavation <br />' investigation and ground water monitoring results The geologic and <br /> hydrogeologic data are presented first, followed by soil and ground <br /> water chemistry data <br /> -Geology and Hydrogeology <br />' The field geologist on site during drilling activities prepared drilling <br /> logs for each soil boring (Appendix B) Lithologic and hydrogeologic <br /> conditions were noted during drilling and recorded on the drilling <br /> logs <br /> FormFormeg Tank Site #1 Geologic and hydrogeologic conditions <br /> encountered during drilling at soil boring locations within the <br /> warehouse building were generally comparable to those described <br />' during previous investigations at the site As illustrated in the drilling <br /> logs in Appendix B, approximately 1 to 2 feet of fill material underlies <br /> the building foundation Beneath this fill material, a series of <br /> relatively fine-grained sediments were encountered (e g , silty clay, silt, <br /> silty sand) Ground water was encountered at approximately 15 feet <br /> below the top of the building foundation This depth to water is <br /> 4-3 <br />