Southland District Council (SDC) is installing new rising sewer main between treatment plant and disposal fields in Stewart Island. The majority of works are located in the road corridor of Back Road, Stewart Island.

This has previously been out to market on GETS but is being re-tendered due to insufficient tenderers.

Please note the following clarifications from the first round:

• Defects Liability Period - 24 months.
• Link in dispersal field - the termination detail at the disposal end will be a BSP threaded entry into a pre-existing tank.
• Filter installation - all pipework, concrete work etc. shown on plans 110 and 111 are to be included in schedule item 2.5.
• Item 2.2 - Ducts are to have a minimum 600mm vertical and horizontal clearance from any service line.
• Item 2.5 - These works are to be included within the array of works, if perspective tenders feel items fall outside the schedule of rates, please add any required schedule items within the tender letter as expected variations.
• Item 2.1 - Existing pipeline to remain in service until changeover as per Section 1.3 of the tender document.
• Air valves - There is no survey that I am aware of, so cannot define where they would be installed. The contractor would need to identify the high points and install the air vales as per manufacturer specs.
• Pigging stations - Pigging points will be provided by the Principal and will be stainless steel. All perspective tenders should allow two stub flanges and fasteners for each pigging point.
• Pipe size clarification - The pipe to be priced is DN90 PE 12.5 coil pipe.