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�+ Ms.l 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 have also noted that ground water <br /> cleanup often occurs, even in clay soils, whensoil' vapor extraction is used <br /> r 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, grou''nd water remediation, and <br /> an additional monitoring well south of the paint shop. <br /> Ifou have an ' <br /> y, y questions, please call me at (916) 361-5726. <br /> `fL�ZATH A. THAYER <br /> Assoc4jke Engineer <br /> j <br /> ,a <br /> I <br /> i <br /> - I <br /> l <br /> r <br />