Jersey Airport North & South Aprons / Fuel Separator & Reed Beds
Contract Award Date 2006
Contract Completion Date 2009
ICE 5Th Edition(Amended)
Tender Sum £2.1 million, Final Account Sum £2million. (Daywork sum & PC sums reduced)
Hertford Road, Hoddesdon EN11 9BX Hertfordshire
Mr R Offard
Tel 01992 305 000
As part of an ongoing drainage and environmental management strategy, Jersey Airport has invested in major surface water treatment facilities to manage the runoff from the airport pavements.
As part of the North Apron replacement works at Jersey Airport, it was necessary to construct a drainage system to separate clean and dirty water running off the buildings and areas of aircraft hardstanding. Clean water from roof areas is collected and discharged via a separate drainage network to soakaways, returning the rainfall to groundwater.
The reed beds were constructed from reinforced concrete & gabion baskets filters and clad on the exterior face with hardwood on Le Mont a la Brune. The reed bed system removes metals, and other inorganic compounds are removed before a final ‘polishing’ of the water prior to being discharged into the surface water. The system is designed to mitigate potential contamination of the sensitive groundwater resources pollution by airfield de-icing chemicals and by aviation fuel spillage.
The reinforced concrete fuel separator with grasscrete access roads was constructed to remove the hydrocarbons from the surface water run off areas both North & South Aprons. It was then later connected to all the surface water runoff from the resurfaced runway.
Jersey North Apron reconstruction works consisted of the demolition of the old aircraft parking aprons on the North side of the passenger pier, and the construction of new pavements to accommodate all current and proposed aircraft types likely to use the airport. The old concrete paving was crushed on site and recycled for the use in the new construction, so minimizing both the import of fresh aggregates and the off-site disposal of waste materials. These were retained on site by Jersey Airport for use in future projects for example the new cargo centre.
new surface water drainage network was installed with new cast in-situ manholes and connected to the fuel separator. A ducting network was installed below the new lean mix concrete before the finished surface course of PQ concrete being installed.
The South Apron replacement project was a continuation of the process of replacement of worn out concrete similar to that found on the North Apron. The project required the removal of and replacement of approximately 30,000m2 of operational apron to the South of the passenger pier and terminal building.
The construction works were carried out in phases to maintain aircraft operations throughout, with the minimum of operating restrictions. This required extensive planning and risk management.
Project Challenges that were associated with the contract were that the hard standing for aircraft was live, as the airport was still operating while the works were being carried out. The main haul road to the North Apron was managed using a traffic light system when aircraft were scheduled for departure and landing the construction traffic crossing was put on all red under instruction from the control tower. They were in constant contact with the TMO officer on the crossing point until clearance of the aircraft either landing or departing was clear of the works area.
During the works of the upgrading of the ducting and drainage, the works were carried out on night shifts for an 8 month period. The airfield was handed over to the contractor to carry out the works and on completion of the night shift it was inspected by Jersey Airport staff and a hand back to operational staff.
The contract was a lump sum fixed priced with an amendment of a target cost included. The works were completed to programme and on budget.