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{ <br /> f:\proj cMV 1 136\tyi-.-p <br /> 2.0 PROCEDURES AND RESULTS <br /> 2.1 Soil Boring <br /> A soil boring, T&1, was drilled under the direction of ESE on October 18, 1990 in the <br /> building adjacent to the excavation with a S1MCO 2400 hollow-stem auger drilling rig. <br /> Figure 2-Soil Sampling Location After Overexcavatiug,shows the location of this boring <br /> Soil samples were obtained at 5-foot intervals with a split-spoon sampler and screened for <br /> hydrocarbons by sight,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 0.75 cubic yards of soil excavated during drilling was separately stockpiled <br /> on plastic in the area near soil previorWy removed from the tank excavation. <br /> � Appendix A contains the TB-1 boring log recorded during drilling.The lag shows that the <br /> � i <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 1-Soil <br /> Sampling Analytical Results shores that none of these constituents were detected in the <br /> ` f sample (TB-1 @ 20'). <br /> E 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 /> .2.2 Overexcavatlon Procedures and Observations <br /> The existing excavation was deepened on October 18, 1990, under the direction of ESE, <br /> with a tracked excavaiur equipped with a 3-foot wide bucket. The overexcavation was <br /> centered on the area beneath samples 5 and 2 shown on Figure 1 (area of former piping <br /> and west end of former diesel tank). <br /> 3 - <br />