Description of the contract
The Works comprise briefly of the replacement of the existing masonry culvert with a ‘free issue’ precast concrete box culvert. New parapets, stepped spillway, training walls and aprons will be constructed. The upstream ditch is to be regraded and lined with concrete canvas.
• Maintaining traffic management.
• Careful removal and infilling of existing culvert, including headwalls and fences to both elevations.
• Excavation and new culvert laying, new stepped spillway, headwalls, training walls and aprons.
• Collection (from Lon Parcwr Depot, LL15 1NA), delivery and offloading to site and installation of new ‘free issue’ precast concrete culvert units.
• Waterproofing new culvert.
• Construction of re-graded and concrete canvas protected inlet ditch.
• Construction of masonry faced concrete headwalls, training walls, stepped spillway and parapets
• Reinstatement of highway surfacing with new kerbs, carriageway markings and bollards.
• Reinstatement of fencing to elevations.
• Minimal use of full-highway closures.
• Maintain safe vehicle access to Pen-y-Guelan.
• Temporary works shall ensure that water can be conveyed with no pollution during the works until transferred into the new culvert (Note: River Dee SAC/SSSI is 170m downstream).
• Diversion of unknown private copper water pipe assumed to be feeding cattle water.
• Safe working within vicinity of buried BT cables.
• Safe working within vicinity of 11kV buried and overhead line.
• Safe working in excavations and support of surrounding structures.
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