The site of a former builders merchant in Bedfordshire was undergoing redevelopment into residential properties. A site investigation found that underground storage tanks (USTs) had caused groundwater contamination in the southern part of the site and that surface spills had been identified as the cause of contamination found in the north (see figure 1). The USTs were removed in an earlier redevelopment phase.
The dissolved TPH and PAH plume extended throughout 600m2 of the site, comprising concentrations of up to 1,200 μg/l.