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Sampling Methods Soil lithology was logged using the Unified Soil Classification System <br /> and the Munsell Color chart Encountered lithology is described on <br /> • the exploratory boring logs presented in Appendix B Soil samples <br /> were collected from the borings for lithologic description, potential <br /> chemical analysis, and Bead-space analysis Water samples were <br /> collected from the CPT borings for chemical analysis To avoid <br /> possible cross-contamination, separate CPT borings were drilled for <br /> each ground water sampling interval Soil samples from the well <br /> borings were screened for the presence of organic vapors using a <br /> photo ionization detector (PID) PID readings are recorded on the <br /> boring logs <br /> Number ofBorings/Wells. Two borings (CPT-1 and CPT-2) were drilled on February 17, 1998 <br /> with CPT equipment Six borings were drilled on February 19 and 20, <br /> 1998 All six of these borings were converted to ground water <br /> monitoring wells (S-1 through S-6) The locations of the borings and <br /> wells are shown on Plate 2 <br /> Boring Depths. The CPT borings were drilled to a depth of 60 feet below grade (fbg ) <br /> The borings for wells S-1 and S-2 were drilled to a depth of 30 fbg <br /> The borings for Wells S-3 through S-6 were drilled to a depth of 25 <br /> ifbg <br /> Ground Water Depths. First encountered ground water was observed between 14 and 16 fbg in <br /> the well borings during this investigation Static ground water levels <br /> stabilized at approximately 12 to 13 fbg <br /> Sediment Lithology: Lithology encountered during drilling of the well borings consisted of <br /> clay (CL), silt (ML), clayey sand (SC), silty sand (SM), and sand (SP) <br /> to the total depth explored of 30 fbg Lithology varied from boring <br /> to boring without a consistent stratagraphtc order of soil types The <br /> CPT bortngs encountered similar soil types to those encountered in <br /> the well borings, with silt being the predominant soil type to the total <br /> depth explored of 60 fbg In both CPT borings, a silty sand to sand <br /> layer was encountered at approximate depths of 41 to 45 fbg <br /> Soil Chemical Analyses Soil samples from each boring were submitted for chemical analysis <br /> Samples were analyzed for TPPH, BTEX, and fuel oxygenates <br /> (ethanol, tertiary butyl alcohol, mtheyl-tertiary-butyl ether (MTBE), <br /> di-isopropyl ether (DIPS), ethyl tertiary butyl ether, and tertiary <br /> 240-0943 3 <br />