Installation and repairs to culverts at Chippenham Fen NNR

Tender description

NE appointment under Construction (Design and Management) Regulations 2015 the role of Principle Contractor and Designer to Supplier to cover: 1) Shall build up soil over two existing culverts to raise the level at position 1 & 4. At position 1 to bring in stone to provide additional cover, approximately 300mm over the culvert using granite -20mm to dust type one (circa 20 ton) will be used. Compact and grade the surface. At position 4 on map -To make up ground on the cross over point of the two ditches and reed beds using site won material from reed bed, loaded into a tracked dumper and taken to the tip area for spreading and compacting using the excavator. Approximately 300mm - 500mm cover required. Following successful work there will be; - No impediment to the flow of water - Farm machinery or livestock can cross both culverts safely. 2) Shall install two bridges with steels and the timber being supplied by Natural England at positons 2 & 3 on map - create an abutment base either side of the drainage channel using the old steel beams by cutting them to the require length. - Place crossing steels on abutment and weld into place. - The steels will then be drilled and the oak sleepers attached to form the bridge decking. - The ground will then made up to enable safe movement on/ off the bridge. Following successful installation there will be; - No impediment to the flow of water - Livestock can cross the bridges safely Key Timescales; - Work to commence September and to be completed by end of October 2018