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i <br /> J. H. KLEINFELDER & ASSOCIATES <br /> 7 RECOMMENDATIONS <br /> ----------------------------------------------------------------- <br /> - The hydrocarbon plume in the ground water beneath the tank <br /> excavation area has been characterized by the information <br /> obtained from the Phase 1 and Phase 2 soil and ground water <br /> investigations . Plume boundaries and direction of migration <br /> beneath the tank excavation area have been estimated from ground <br /> water analytical results and ground water table elL- ations from <br /> monitoring wells MW-1 , MW-2, MW-4, and MW-7. The ground water <br /> _. gradient and absence of detectable constituents in monitoring <br /> wells MW-3, MW-5, and MW-7 suggest that the tank excavation <br /> area is not adversely impacting the on-site production well. <br /> -� The present network of ground water monitoring wells is <br /> sufficient to monitor the hydrocarbon plume beneath the tank <br /> excavation area. It is our recommendation that no additional <br /> wells be installed north of the main building. An additional <br /> ground water monitoring well may ba required south or southeast <br /> of the main building to assess the lateral extent of petroleum <br /> hydrocarbon migration in this direction. <br /> We would recommend the preparation of a preliminary ground water <br /> remediation Work Plan. The objective of the ground water <br /> remediation program is to recover the central portion of the <br /> .__..___.hydr.ocarbon_._p.lum.eand_._._ef_f_e.ctiv_e.l.y_r.emo_ve_the majority of the <br /> hydrocarbon constituents from the underlying ground water. The <br /> following items will be addressed in the remediation Work Plan: <br /> 19:531 15 <br />