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I <br /> Section 6 <br /> 1 Recommendations <br /> i <br /> Based on the results of this investigation, the vertical and lateral extent of bunker fuel <br /> contaminated soil appears to have been delineated No further soli investigation is <br /> recommended at this time Presented below is an evaluation of remediallclosure alternatives to <br /> 1 address the petroleum-contaminated soil <br /> 1Alternative 1. In-glace CLour_c Contaminated Sog <br /> - <br />' Since petroleum hydrocarbons have been detected within a confined soil horizon at 15 feet <br /> bgs, and groundwater may be present at a depth of approximately 80 feet, the site may be a <br /> candidate for "no-action", i e , to allow natural attenuation of hydrocarbons The Leaking <br /> Underground Fuel Tank (LUFT) Manual soil screening guidance levels are generally <br /> employed to establish cleanup criteria or evaluate in-place closure for petroleum UST spill <br /> sites <br /> 1 To evaluate the no-action alternative, additional lithological and groundwater data must be <br /> obtained Tetra Tech recommends completing a single soil boring to a maximum depth of 100 <br /> 1 feet bgs at the center of the identified area of petroleum-contaminated soil to evaluate lithology <br /> and to identify the approximate depth to groundwater The soil boring should be drilled using <br /> continuous core sampling to adequately characterize lithology Further soil sampling for <br /> 1 laboratory analyses may be required to ensure that no petroleum contaminated soil is present <br /> toward groundwater All data acquired from the soil boring can be used to evaluate the <br /> 1 feasibility of in-place closure of petroleum hydrocarbons <br /> 1 <br /> 1 <br /> 1 <br /> TETRA TECH Stockton Developmental Center,Phase If Site Investigation Report Page 16 <br />