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Grounds for optimism at Orwell

SITE INVESTIGATION CONTRACTS

CARD GEOTECHNICS has won a £500,000 contract with Persimmon Homes for the design and management of remediation of the former Orwell Gas Terminal in Cambridgeshire.

When it was closed 30 years ago the gasworks covered 1.5ha. It has since been demolished and the site levelled but the foundations and tar tanks are still in the ground.

To complement conventional investigation techniques, Card will use ground probing radar to locate any buried structures, pipes and tanks.

A risk assessment was undertaken to look at the potential of contaminants migrating into the nearby river and numerical modelling techniques were used to identify environmental aquatic sensitive targets.

From the findings a remediation management system has been created and trials carried out to find out the optimum cleanup solution. Work is expected to be completed in September 2003.

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