The Meteor Park Development, formerly the Delta Metals engineering facility (Figure 1), lies close to Birmingham city centre. In the years prior to 2006, development had been marginal due to spiraling remediation costs associated with significant impacts to site groundwater and soil.
The lead consultant and remediation contractor (WSP Remediation Ltd.) adopted a combination of sustainable on-site treatment technologies to address a complex mixture of contaminants across a variety of media. This work was carried out as a fixed price contract.
The site was heavily impacted by more than 60 years of heavy industrial use associated with the machining and manufacture of vehicle components. Extending over 4.4 hectares of land, the site is located above a major aquifer (the Sherwood Sandstone) and adjacent to the River Tame. These water resources are the most sensitive environmental receptors in the area. Below a layer of granular made ground, the site consists of organic alluvial clays, and river terrace sands and gravels underlain by the sandstone aquifer.
Site investigations identified various impacted areas/media: diesel-oil hydrocarbons and chlorinated solvents in the made ground and alluvial soils; localized free product / LNAPL within perched water and sands, and widespread dissolved phase chlorinated solvent impacts within the underlying sands and gravel aquifer (Figure 2). This plume covered an area of approximately 3,150 m2. The contaminants of concern were Trichloroethene (TCE) with a maximum concentration of 103 mg/L, and degradation products cis 1,2-Dichloroethene (DCE) and Vinyl Chloride (VC).