Geoenvironmental Engineering
Gibraltar Airport Tunnel
Clarke Bond were commissioned and continue to provide environmental management and waste
management expertise to the Government of Gibraltar for a major infrastructure project in
Gibraltar. The project involves the design and construction of a new section of dual carriageway
that passes under the runway by means of a 350 m long cut-and-cover tunnel with 250m and
220m approach ramps. A subway is also included for pedestrian and cycle traffic.
A new roundabout is included in the scheme, along with two footbridges. Ancillary items include
all associated mechanical and electrical installations, drainage and adjustments of existing
infrastructure.
Due to a history of military use including ammunition, aviation fuel storage and rifle ranges, the soil and groundwater at the site was found to be contaminated with heavy metals and hydrocarbons. Due to Gibraltar’s size and location, sustainable use of the waste soil arisings (70,000 m3) was key to the success of the project.
Clarke Bond initially worked with the local project management team to ensure that the contractor’s proposals were suitably designed to mitigate the risk posed by the contaminated land and groundwater. This included oversight of the construction of a large groundwater treatment facility capable of treating significantly contaminated water to below Saline Environmental Quality Standards. In addition, we undertook a detailed site investigation of the tunnel profile and managed the specification and commissioning of a soil wash facility.
We have subsequently provided detailed assistance on groundwater treatment facilities, and have recently been commissioned to provide a Waste Management Plan and a detailed specification to facilitate the tracking and management of all excavated contaminated soil.
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