PS/26/96 - B741 Coal Glen Embankment – Slip Remediation

Repair of existing highways embankment showing signs of slope instability by excavating out failed materials and replacing with engineered fill at a gentler regraded slope of 1V:3H with counterfort drainage; Repair of existing culvert through installation of a CIPP lining (Contractor designed); 10m extension of existing culvert with precast concrete box culvert (Contractor designed) to accommodate regraded slope; Construction of transition unit with manhole access at location where existing and extended culverts meet (Note: Manhole access chamber is to be Contractor designed); Construction of new outfall headwall (Contractor designed) with scour protection through installation of erosion control matting at outfall location; Widening of highway verges to 2m width on both sides of the highway with installation of verge marker posts and post and mesh fencing; Installation of highways surface water drainage system with direct outfalls to Coal Glen watercourse at northern inlet to existing culvert and to the transition unit between existing and extended culvert.