The investigation comprised marine and on-land investigation techniques on the Firth of Forth, Scotland. It was proposed to re-develop Bo'ness Harbour into a functional marina with associated private residential and commercial properties occupying the adjacent surrounds. The marina was intended to provide pontoon berthing space for leisure craft by regenerating the harbour to include a piled wall closure and lock access across the entrance, two bridges within the inner basin and remedial stabilisation of the existing harbour wall infrastructure; amongst other constructed elements.

Cable percussion and cone penetrometer methods were performed from a uniflote pontoon drilling platform in a heavily silted harbour area, with a significant tidal range. Standard penetration testing, variable head permeability and vane shear were undertaken in the cable percussion holes in accordance with the contract specification. Rotary coring was performed using a 412” core barrel and air flush in order to retrieve 76mm lined rock cylinder samples. Coring yielded few losses even where ‘broken ground’ and artesian water conditions were encountered.  

Access to the pontoon used bespoke interlocking buoyancy modules to provide safe walkways for operatives, with a support boat on hand as an additional safety feature.  The work was successful and was commissioned, in part, on our unique approach to the access issues that the harbour presented.

EXPERTISE FOCUS: Over-water Dock and On-land