The 5-km section through a SSSI (Site of Special Scientific Interest) has already been reinstated using specialist seeds to ensure that the new grass blends seamlessly within the surroundings. Special methods of turf removal and topsoil stripping and replacement were employed so that disruption to the area was mimimized. A large quantity of unexploded ordnance was also discovered during the work. The £20-million contract involves the construction of a high-pressure welded steel pipeline with connections to AGIs (above-ground installations) at each end, requiring hot tap connections and gas control facilities. The scheme includes the combined crossing of the River Clydach and A465 (Heads of the Valley) road and a further section of roadworks at Brynmawr. The terrain is extremely challenging, encompassing extensive ravines and steep hillsides. The very steep gradients, up to 28º, will require winch and anchor systems to be used for all machinery to ensure safe working at all times. Protection may also be required in the event of very severe weather so a mountain refuge is to be provided. During the winter months preparatory work will be undertaken on the slopes in readiness for pipelaying to restart in April, and routes will also be cut through woodland. The award followed the £24-million completion by the joint venture of the 42.5-km Peterstow to Gilwern section last year.