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of this recommendation, EMCON Associates and Teichert recognize that <br />' monitoring of (1) the zone of influence, (2) mass of petroleum hydrocarbons <br /> removed, and (3) concentration of dissolved petroleum hydrocarbons in <br /> ground water will be warranted. Based on the result of this monitoring, SVE <br /> system effectiveness will be evaluated, and the need for an additional SVE <br /> well installed near well MW-13 will be assessed. <br /> 6.2 Ground Water <br /> Based on the recent ground-water analytical data from wells MW-10, <br />' MW-11, ME-12, and MW-13 (see Table 3), ground water beneath the <br /> location of the former tank location has been impacted with petroleum <br /> hydrocarbons. Based on the absence of detectable concentrations of <br />' petroleum hydrocarbons in the ground-water sample from downgradient <br /> well MW-12, EMCON Associates believes that the petroleum hydrocarbon <br /> plume has not migrated off site. Because the petroleum hydrocarbon plume <br />' has not migrated off site, and EMCON Associates is proposing to remediate <br /> the soil at the site using SVE, EMCON Associates is recommending indirect <br /> remediation of the ground water. Reasons for this recommendation are <br /> discussed in Section 7, Proposed Corrective Action. <br /> 1 <br /> 1 <br /> pjO\Of9O\Of900020.1 ag 6 - 3 Rev. 0 December 15, 1992 <br />