Water Trunk Mains Replacement

Overview Lithgow City Council is seeking a contractor to design and construct a water trunk mains replacement, involving the supply and installation of approximately 250m of DN450 water main. Scope The scope includes: Supply and installation of approximately 250m of DN450 water main Design of the works to provide a complete, operational and maintainable DN450 water trunk main, including alignment, pipe material and pressure class, design flows and pressures, surge requirements, cover, bedding and embedment, corrosion protection, valve and fitting arrangements, thrust restraint, access for operation and maintenance, design life, testing requirements and interfaces with existing assets Trench excavation, bedding, embedment, pipe laying, backfilling and compaction Supply and installation of all required bends, tees, reducers, flanges, dismantling joints and other fittings Installation of thrust blocks, anchor blocks, mechanical restraints and other protection required by the approved design Installation of isolation valves, air valves, scour arrangements, hydrants and associated chambers/pits as required by the approved design Installation of markers Backfill and compaction of trenches Topsoiling and revegetation of all disturbed areas Hydrostatic testing of the water main Construction of the new main through all road, creek, drainage, utility and other infrastructure crossings identified in the Contract Documents, including excavation support, temporary works, dewatering, asset protection and reinstatement Completion of all required connections to the existing live water network at the identified connection points, including preparation of tie-in, isolation, shutdown, contingency and commissioning procedures for Council acceptance, and coordination with Council to minimise disruption to customers Reinstatement of all areas disturbed by the works, including roads, pavements, kerbs, verges, driveways, landscaping and other affected surfaces, to pre-construction condition or the standard specified by Council Compilation and submission of quality assurance documentation, ITP records, inspection records, material certificates, pressure test results, disinfection and bacteriological test results, commissioning records and survey information Submission of final Work-As-Executed (WAE) drawings and other required handover documentation upon completion of the works Contractor Requirements Identify in the Tender any design assumptions made where criteria are not expressly stated in the Contract Documents Verify information supplied by Council regarding the proposed pipeline alignment, work limits, connection points, known services, property boundaries, access constraints and identified crossings State any alignment, access or ground-condition assumptions that materially affect the Tender Where proposing an alternative crossing method, identify the method, assumptions, exclusions and any additional approvals required in the Tender State any allowance for staged construction, temporary water supply, night work and repeat attendance Submit a schedule of assumptions, qualifications, exclusions, departures and proposed alternatives, noting that any matter not expressly identified is taken as included where reasonably necessary to deliver the complete, operational and compliant works Positively verify existing services before excavation using BYDA information, Council records, site inspections and non-destructive hydro-vacuum excavation; hand or mechanical potholing is not permitted Notify Council at least 20 working days before starting an affected activity where an existing service differs from Council's information Undertake all works in accordance with the approved construction drawings, project specifications, relevant Australian Standards, manufacturer requirements and Council requirements