In situ soil mixing treatment of contaminated soils and groundwater: two case studies

C.W. Evans 

Abstract
The use of soil mixing is becoming more popular, both as a technique for the implementation of stabilization/solidification (S/S) soil treatment, and for the installation of low-permeability and reactive barriers. It was the main approach adopted for a major redevelopment project in the former industrial dockland area of Dublin, where a low-permeability cut-off wall and soil treatment with simultaneous ground improvement works were carried out. It was also the technique of choice used to address contamination issues at a former industrial site in Devon, by the installation of permeable reactive barriers (PRBs) and also the in situ S/S of soils as a temporary works solution. This paper outlines details of the two projects, highlighting the benefits of the technique, and the importance of preliminary treatability studies to establish potential treatment performance. As soil mixing is undertaken on projects of this nature, greater confidence will be gained in the use of the technique for remediation works, both to address geotechnical and contamination problems. 

Key words: contaminated soils, field trials, permeable reactive barriers, soil mixing, stabilization/solidification, treatability studies 

Land Contamination & Reclamation, 14 (1), 2006, 57-67 

DOI 10.2462/09670513.705 

Updated: 26-Jun-2006