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Ms. Margaret Lagorio - 2 - 23 July 1991 <br /> additional soil and ground water remediation proposals. Because contaminated <br /> soil was placed in the tank excavation, we recommend that reexcavation be <br /> considered as a soil remediation option. We havealso noted that ground water <br /> cleanup often occurs, even in clay soils, when soil vapor extraction is used <br /> in" conjunction with air injection. <br /> In addition, the ground water in the area to the south of the paint shop <br /> downgradient of MW2 has not been adequately investigated. We recommend that <br /> Holt Brothers submit proposals for excavation, ground water remediation, and <br /> an: additional monitoring well south of the. paint shop. <br /> If you have any questions, please call me at (916) 361-5726. <br /> d ^ :f <br /> v� L <br /> - A-� TH A. THAYER <br /> Assocte Engineer <br /> j <br /> i <br /> i <br /> t <br /> { <br /> I <br /> i <br />