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Similarly, samples were collected from Aeration Pile 2 on July 27, 1989, <br /> compos ited and submitted for analysis of total volatile hydrocarbons (TVH) <br /> and BTXE. The analyt'.cal results are presented below. <br /> Locations <br /> Soil Aeration Soil Aeration Pile 2 <br /> T'.H/G ND* NA** <br /> TVH NA ND <br /> BTXE <br /> 0.129 ppm 0.03 ppm <br /> ~ * ND - Not detected at the detection limits of the instrumentation. <br /> ** NA - Not analyzed <br /> Laboratory data sheets and chain-of-custody forms from the sampling <br /> occasions are presented in Appendix I. <br /> Based upon the analytical results, the aerated soil could be used to fill <br /> the excavated area. The soil should be compacted to the appropriate <br /> density of the existing undisturbed soils. <br /> In-Situ Soil Remediation <br /> The estimated lateral extent of soil contamination above the water table <br /> identified in the Site Assessment Report is shown on Figure 3. A no.. <br /> action remedial approach for soil. contamination at this site is not <br /> considered appropriate because . elevated concentrations . of petroleum <br /> hydrocarbons in soils (>100 ppm) would pose a threat to groundwater,; <br /> quality and if not remediated .would.. require that the duration of ; <br /> groundwater cleanup activities continue over a very lengthy period of <br /> time. <br /> A variety of technical approaches are available for cleanup of soil <br /> containing petroleum hydrocarbons. Depending upon site-specific <br /> conditions, soil venting, in-situ bioremediation, excavation and off-site <br /> disposal or excavation and on-site treatment can be effective remedial <br /> alternatives. At the Sebastiani Vineyards/Woodbridge Cellars, the <br /> presence of groundwater contamination, the potential for fluctuating <br /> groundwater levels to contaminate clean backfill material, and the <br /> proximity of existing structures limit the applicability of excavation as <br /> an approach to soil remediation. Since groundwater levels at the site <br /> would be expected to lower with the proposed extraction of groundwater for <br /> site remediation, additional unsaturated zone materials which would likely <br /> require treatment, could not be adequately addressed by excavation. An <br /> in-situ approach to soil remediation is therefore considered most <br /> appropriate for the 5ebastiani Vineyards/Woodbridge Cellars site. Since <br /> 8 <br />