The site is a located on a peninsula of land that extends from an existing public park and is bound by a tidal river to the east and a pill (stream) to the west, rising around 2-3m above river level. Whilst no evidence currently exists at the surface, the site is a former allotment gardens, having also been historically landfilled to raise levels. Beneath the Made Ground, low strength alluvial soils are present, associated with an adjacent river channel.
The redevelopment works are required as the site suffers from frequent trespassers who access the site in order to excavate and obtain valuable historic glass bottles and earthenware from the landfill materials.
The excavations left behind by these trespassers, have been recorded to have been undertaken to depths of 2-3m in places, prior to dangerous abandonment. The works and assessment were required to consider this aspect and to provide conclusions that removed this opportunity to prevent future trespassing and ensure safety.
We initially proceeded with a review of historic third party investigation information, supplemented by a contemporary ground investigation, targeted at obtaining further geoenvironmental data. Assessment identified the historic landfill waste to contain elevated levels of arsenic, lead and polyaromatic hydrocarbon (PAH) compounds which could pose a risk to future users of the site when redeveloped as public open space/parkland. In addition to this, the levels of several metal compounds were assessed to pose a phytotoxic effects and impact on future planting and levels of leachable contamination posing a potential risk to the adjacent river.
Further to the initial assessment, we were appointed to provide a formal remedial methodology for the site, to ensure the resulting scheme does not pose a risk to site end users, or the adjacent river. As part of this supplementary phase of work we also undertook a budgeting exercise to obtain the likely costings of the recommended remedial strategy. These costs were presented to the client so that appropriate funding can be secured to implement the remediation scheme and ultimately redevelop the land.
As part of this project we have implemented a contemporary review and expansion of geoenvironmental data, the provision of detailed risk assessment for the site, and concluded with the presentation of a robust, costed landfill remediation strategy to allow detailed design of the scheme.
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