GROUP SUSTAINABILITY REPORT 2010
LAND REMEDIATION
Making sure unproductive or contaminated land is restored and therefore able to be used again reduces the pressure for industry to use uncontaminated land. And restoring unproductive land in the most sustainable manner practical further enhances these benefi ts. In this section we describe how our specialist division WSP Environment and Energy has delivered this service for some our clients.
ACTIVE MANUFACTURING FACILITY IN EAST RUTHERFORD, NEW JERSEY, USA
WSP was contracted to characterise and remediate an impacted aquifer at an active manufacturing facility in New Jersey. At the site there had been a historic release of methylene chloride from an active chemical loading area which had contaminated a stratifi ed aquifer with concentrations exceeding 250mg/l. Because the client no longer owned the facility, completing the work while minimising interference to ongoing manufacturing operations was essential. If operations stopped then they would be liable for the loss of productivity.
Following identifi cation of the problem, WSP designed, installed, and maintained an in-situ chemical oxidation system using ozone. The design included a network of 19 delivery point clusters installed in three subsurface zones, an ozone conveyance
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network, and an ozone generator housed within a dedicated enclosure. The design also included waste minimisation practices to avoid disposal of characteristically hazardous shallow soils. Priority was given to minimising interference with site operations during all aspects of the installation and maintenance of these systems, including completing work during off hours.
Reductions of methylene chloride concentrations of more than 75% and 99% have been achieved in the shallow (high concentration) zone and deeper zones, respectively. Above-grade conveyance system runs minimised trenching and hazardous waste generation and disposal costs. The use of practices to minimise interference with site operations led to no downtime for the facility, and no increase in costs for the client. WSP’s remedial approach of in-situ chemical oxidation signifi cantly decreased the methylene chloride and other volatile organic compound (VOC) concentrations without interfering with the existing manufacturing operations.
EMBEDDING SUSTAINABILITY
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