Mains Rehabilitation

Tender description

This project includes, but is not limited to the following packages of work: A new chemical storage and dosing system to aid Phosphorus removal A new pre-aeration primary tank supernatant and RAS mixing and distribution chamber A new activated sludge aeration lane that matches existing with two new 35 m diameter final settlement tanks and RAS system A new Tertiary Solids Removal treatment stage A new standby power facility A new centrate storage tank and pump system to return centrate for treatment A new Picket Fence Thickener to operate in parallel to two existing units A new liquor return pump station to return site liquors for treatment Lot 1: Lot 1 (Design and Build) Lot 1 - Design and Build Water Quality, Burst Driven, DMA Replacement IChemE Burgundy Book - TW Amendments Optimisation, structural replacement or relining of distribution water mains within DMAs and bounded by district meters and the District Boundary Valves. Structural replacement of all service connections from the distribution mains to customer boundaries, including installation of a suitable boundary box. Replacement of all apparatus connected to the network including valves, hydrants, disinfection points, air valves, etc. Securing abandoned mains by cutting and capping. Removing surface covers, marker posts and plates of abandoned washouts, hydrants and valves etc. so that only covers relating to live apparatus remain. Lot 2: Lot 2 (Build Only) Lot 2 - Build Only Water Quality, Burst Driven, DMA Replacement NEC4 ECSS Short form with TW Amendments Optimisation, structural replacement or relining of distribution water mains within DMAs and bounded by district meters and the District Boundary Valves. Structural replacement of all service connections from the distribution mains to customer boundaries, including installation of a suitable boundary box. Replacement of all apparatus connected to the network including valves, hydrants, disinfection points, air valves, etc. Securing abandoned mains by cutting and capping. Removing surface covers, marker posts and plates of abandoned washouts, hydrants and valves etc. so that only covers relating to live apparatus remain.