[en] The site is a 72,846 square meter (18-acre) abandoned strip mine located in Western Pennsylvania used for municipal and industrial waste disposal until the mid-1970's. The waste pit is adjacent and connected to a flooded deep mine which saturated the waste over the past 20 years. The site was placed on the National Priority List in 1984, primarily due to the presence of drums on the surface of the site. EPA's proposed remedial action for the site included excavation and stockpiling of the waste materials, backfilling the pit with clean materials, constructing a RCRA cell on the clean materials, and disposing of the waste into the cell. The estimated cost of EPA's remedy was approximately $26 million. An alternative action proposed included in-place closure and containment at the site. Many were unsure whether a slurry cutoff wall could be installed through the deep mine adjacent to the waste pit. The proposed alternative of grouting mine voids to facilitate slurry wall installation had never been performed on a Superfund site, and resulted in a cost savings of approximately $15 million. The grout and slurry wall were successfully installed, with complete closure expected by spring of 1997

[en] Shallow Soil Mixing (SSM) and Soil Vacuum Extraction (SVE) are techniques which have been increasingly relied on for the insitu remediation of contaminated soils. The primary applications of SSM have been to mix cement, bentonite, or other reagents to modify properties and thereby remediate contaminated soils or sludges. Soil vacuum extraction has been used at numerous applications for insitu removal of contaminants from soils. At a recent project in southern Ohio, the two technologies were integrated and enhanced to extract volatile organic compounds (VOCs) from soils at a Department of Energy facility. Advantages of the integrated SSM/SVE technology over alternative technologies include a relatively rapid remediation compared to other in-situ techniques at a lower cost, less exposure of waste to the surface environment and elimination of off-site disposal. These advantages led to the selection of the use of both technologies on the project in Southern Ohio. The information presented in this paper is intended to provide Engineers and owners with the level of understanding necessary to apply soil mixing and vacuum extraction technology to a specific site. The most important steps in implementing the technology are site investigation, feasibility estimate, selection of performance criteria, selection of appropriate materials, bench scale testing and construction