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2,0 PROCEDURES AND RESULTS <br /> 2.1 Soil Boring <br /> A soil boring, TB-1, was drilled under the direction of ESE on October 18, 1990 in the <br /> building adjacent to the excavation with a SIMCO 2400 hollow-stem auger drilling rig. <br /> Figure 2-Soil Sampling Location After Overexcavating,shows the Iocation of this boring. <br /> Soil samples were obtained at 5-foot inlecvals with a split-spoon sampler and screened for <br /> hydrocarbons by eight,odor, and with an Organic Vapor Analyzer(OVA). Samples were <br /> contained in sealed, labeled brass tubes and stored on ice for possible laboratory. <br /> Approximately 0.25 cubic yards"of soil excavated during drilling was separately stockl•iled <br /> '' on plastic in the area near soil previously removed from the tank excavation. <br /> d Appendix A contains the TB-1 boring log recorded during drilling.The log shows that the <br /> soil beneath the site consists mostly of silt and silty clay. No ground water was found <br /> ! during drilling. The boring was drilled to 20 feet with no evidence of hydrocarbons found <br /> in the soil. A soil sample from 20 feet was submitted for laboratory analysis to confirm <br /> field observations. The sample was analyzed for TPHG,TPHD,and BTEX. Table I-Sol! <br /> Sampling Analyticnl results shows that none of these constituents were detected in tLe.. <br /> sample (TB-1 @ 20'). <br /> Soil samples from boring TB-1 appear to indicate that petroleum hydrocarbons have not <br /> migrated from the former tank area into the soil beneath the building. <br /> i <br /> 2.2 Ovesexcavation Prooedures and Observations <br /> The a dAing e.Ycavation was deepened on October 18, 1990, under the direction of ESE, <br /> with a tracked excavator equipped with it Moot wide bucket. The overexcavation w-45 <br /> centued on the area beneath samples 5 and 2 shown on Figure 1 (area of former piping <br /> and nest end of former diesel tank). <br /> . ' 3 <br /> i <br />