New Fire Station, Devon

The site history information indicated that in the late 19th and early 20th centuries most of the site was occupied by filter beds, associated with the water works to the east, with ground levels sloping down away from the filter beds in the north, west and south. By 1932, the filter beds were no longer present and the site was shown to be occupied by the existing Fire Station. Minor additions and new buildings have occurred between the 1930's and present day.

Based on the published geological data, ground conditions were expected to be made ground, which may include the bases of old filter beds, underlain by clayey gravel over shale bedrock.

Piled foundations were likely to provide the most suitable foundation solution for the new Fire Station if, as expected, the made ground was present to depths in excess of 2.50m and/ or the made ground was wet or unstable.

The preliminary contamination risk assessment indicated there to be a potential risk to both human health and controlled waters. Further testing was recommended to determine which source-pathway-receptor linkages exist so that appropriate remedial measures could be proposed. Remedial measures would depend on the nature and extent of contamination but might involve covering and/ or removing/ treating contaminated soils.

Gas protection measures comprising a suitable gas proof membrane and ventilated sub-floor void were recommended, subject to confirmation by in-situ gas monitoring. These should be sufficient to protect the building from ground gas and radon.

An intrusive investigation comprising window sample boreholes, laboratory testing and gas monitoring was required to confirm both geotechnical and environmental recommendations. This was subsequently carried out by Ruddlesden geotechnical.

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New Fire Station, Devon image

New Fire Station, Devon image