Hambridge Road, Newbury
This former fuel transfer depot is being redeveloped
as a retail park. Previous work on the site had
shown a confusing picture of hydrocarbon contamination
and no clear strategy for remediation. CL Associates
have developed an innovative strategy for the
remediation of the site, which included further
investigation to better delineate the contaminant
plume and complex negotiations with the Environment
Agency to achieve agreement on commercially viable
Remediation Targets acceptable to the regulators,
the funders and the developer.
During the previous usage of the site, leakage
from tanks and pipelines together with an operational
spillage during fuel transfer had contributed
to a contaminant plume extending over an area
of 1500 m2. The site is over a water supply aquifer
and investigation revealed a complex hydrogeological
regime with upward and downward flow together
with seasonal variations in water levels and flow
directions. A hydrogeological risk assessment
was carried out leading to determination of the
Remediation Targets for both soils and groundwater.
The development programme was such that time
was not available for remediation of the site
to be carried out prior to commencing construction.
A scheme of remediation was therefore devised
to enable in situ air sparging and soil vapour
extraction to be carried out whilst construction
proceeded above the treatment.
The remediation has been successfully completed
and the system decommissioned ahead of the scheduled
completion of the development. The end result
has been a very cost effective redevelopment of
a derelict and abandoned site..
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