RFT 2016.074 Western Sector Sewer Trunk Main and/or Littehampton Gravity Trunk Main Stages 4 & 5

Summary and scope

2.1 Mount Barker District Council (the Council) invites Tenders from Tenderers for the following: 2.2 Western Sector Sewer Trunk Main The provision of for the new western sector sewer trunk main and associated works. The proposed sewer main is approximately 1,952 metres in length, to be constructed with DN500 and DN560 HDPE pipe (class PN12.5) by using horizontal directional drilling. Approximately 940 metres of the pipeline traverses public roadway where traffic control will be required in accordance with DPTI Field Guide and SA Standards for Work Zone Traffic Management. Access for emergency vehicles and to private properties by residents must be available at all times. Council would prefer no full road closures. The Contractor is to provide (with his tender) a preliminary traffic management plan and advice where full road closures are required (extent, times, duration, alternative routes) The balance of the work (approximately 1,010 metres) is through the Flaxley Road linear reserve where pedestrian protection measures will be required around all work sites. The project generally includes the supply, construction and reinstatement of the following: • 1,110 metres of DN560 PN12.5 HDPE pipe. • 842 metres of DN500 PN12.5 HDPE pipe • 2 - 1500mm diameter Maintenance Holes (lined) with benching and covers • 13 - 280mm diameter HDPE Maintenance Shafts and covers • Connection of 2 existing 150mm diameter PVC effluent mains to the main drain at MH chainage 1656 (approximately 30m new 150 PVC pipe. • Rebench and line 2 existing Maintenance Hole • 2 – DN250 gate valves in valve boxes fitted to pipelines at MH 304399E/6116664N • 145m DN315 HDPE pipe with concrete encasement at creek crossing • Connect existing 125 PVC to new main at chainage 810 • 52m DN100 PVC and connect to MH at end of Hampden Rd • Other minor works (capping existing obsolete PVC mains, etc) • Provide as constructed drawings The Western Sector project is relatively urgent as housing development has commenced within the sector and collection of sewage will be required. These works must be completed by 30 November 2017. AND/OR 2.3 Littlehampton Gravity Trunk Main Stages 4 & 5 The proposed CWMS mains will replace existing undersized main pipelines servicing the Littlehampton Township. The total length of new pipeline is approximately 1,810 metres, to be constructed with DN180, 280 and 355 HDPE pipe (class PN12.5) by using horizontal directional drilling. Some sections may be able to be undertaken using conventional excavation at the discretion of the Contractor and with the approval of the Superintendent. Approximately 500 metres of the pipeline traverses public roadway (DPTI road) where traffic control will be required in accordance with DPTI Field Guide and SA Standards for Work Zone Traffic Management. Access for emergency vehicles and to private properties by residents must be available at all times. Council would prefer no full road closures. The Contractor is to provide (with their tender) a preliminary traffic management plan and advice where full road closures are required (extent, times, duration, alternative routes) The balance of the work (approximately 1,300 metres) is through the railway corridor, private property and public reserve where pedestrian protection measures will be required around all work sites. The project generally includes the supply, construction and reinstatement of the following: • 100 metres of DN180 PN12.5 HDPE pipe. • 1,115 metres of DN280 PN12.5 HDPE pipe • 595 metres of DN355 PN12.5 HDPE pipe • 7 - 1500mm diameter Maintenance Holes (lined) with benching and covers • 15 DN280 HDPE Maintenance Shafts and covers • Connection of 4 existing 100/150mm diameter PVC effluent mains to the new pipeline • Connection of 25 property services to the new pipeline • Other minor works (capping existing obsolete PVC mains, etc) • Provide as constructed drawings These works must be commenced by 1 December 2017 to satisfy Stage Government grant funding conditions. Tenderers note that Council will hold a briefing commencing at 10am on 22 May at the Local Government Centre, 6 Dutton Road, Mount Barker. Specific sites visits will follow the briefing. Attendance at the briefing or site visits is not a mandatory requirement of this RFT.