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en vtroso <br /> 2.0 FIELD PROCEDURES <br /> 2.1 Exploratory Soil Borings <br /> Ten exploratory soil borings (SB-1 through SB-10) were drilled and sampled on February <br /> 21 and 22, 1996 using the Geoprobe system The lithology of the borings was logged by <br /> an Enviros geologist using the Unified Soils Classification System and Munsell Color <br /> chart Encountered lithology is described on the exploratory boring logs presented in <br /> Appendix A, and a summary of the soil boring data is presented in Table 1 The locations <br /> of the borings are shown on Plate 2 <br /> Soil samples were collected from the borings using a Geoprobe coring sampler for <br /> lithologic description and head-space analysis Sampling intervals were screened for the <br /> presence of organic vapors using a photo ionization detector(PID) PID readings are <br /> recorded on the boring logs <br /> The soil samples were collected in acrylic tubes, capped, labeled, entered onto a <br /> Cham-of-Custody record, and stored in a cooler with ice The samples were <br /> transported to Sequoia Analytical (Sequoia) in Redwood City, California, a state- <br /> certified environmental laboratory, for analysis <br /> The soil samples were analyzed for Total Purgeable Petroleum Hydrocarbons <br /> (TPPH) according to EPA Method 8015 (modified) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX), and methyl tertiary-butyl ether (MTBE) <br /> according to EPA Method 8020 Additional analysis was performed on soil <br /> samples collected from SBA and SB-10, which included Fractional Organic <br /> Carbon Content (FOC), Porosity, Permeability, and Toxicity Characteristic <br /> Leaching Potential (TCLP) for TPPH and BTEX <br /> Decontamination Procedures <br /> Drilling and sampling equipment were decontaminated prior to beginning work and <br /> between sampling intervals Drilling equipment was inspected prior to drilling <br /> 3.0 FINDINGS <br /> 3.1 Geology and Hydrogeology <br /> Lrthology encountered during the drilling of the exploratory soil borings consisted <br /> primarily of clay (CL), silt (ML), silty sand (SM), and sand (SP) to a depth of <br /> approximately 37 fbg Ground water was not encountered in any of the borings <br /> 3.2 Soil Chemical Analytical Data <br /> Soil chemical analytical data are presented to Table 2 The distribution of petroleum <br /> hydrocarbons in soils is shown on Plate 2 Certified analytical reports for soils are <br /> contained in Appendix B A summary of the soil chemical analytical results is presented <br /> 4 <br /> 372 2 <br />