How is the contaminated soil being treated?
With the approval of the EPA and in consultation with the Soil & Groundwater Review Group a soil treatment trial was conducted from May to July 2006. The trial focused on known soil contamination in the south-west corner of the site where tar residue was stored. The benefits of this approach avoid releases of contaminants to atmosphere and costly off-site treatment and disposal costs. The approach involved ‘ripping’ the soil with an excavator and capturing vapours in perforated piping under a heavy plastic cover. The vapours were extracted from the soil into the soil vapour extraction system for treatment in the GWTS. The success of this method is currently being evaluated and will be reported to the EPA and Soil & Groundwater Review Group at the August 2006 Meeting.
