The Mt Gambier to Finger Point WWTP main transports wastewater from Mt Gambier WWPS No 1 (Commercial St, West at the rear of the SA Water Depot) to the Finger Point WWTP Treatment Plant.

The main consists of 4 sections (operating):

1. 0-8.46km DN525mm Mild Steel Concrete Lined (MSCL) rising main installed 1975.
2. 8.46-25.03km 650mm MSCL/MSPL gravity main installed 1982. The flooded sections are MSCL. The sections above the pool level are polyester lined (MSPL) with Ceilcoat Flakeline. The length of the MSPL pipe in total is 724m.
3. 25.03-29.56km DN400mm Reinforced Concrete Rubber Joints (RCRJ) gravity main original installed 1967.
4. 28.4-29.24km DN600 Hobas (Class IO/5000) main installed in 1988.
5. 0-29.59km DN400 RCRJ main (note section 25.03-29.56km still on-line and not duplicated).

Emergency bypass to ocean (unknown, if decommissioned):

6. DN 450km SW Rope and Bitumen Jointed Sewer main.

Scope of the works is as follows:

• Conduct 100% external visual inspection of each pipe spool, with a range of defects to be directly reported to SA Water.
• Determine the position of each exposed pipe length shall be GPS located.
• Organise and coordinate traffic management as required.
• Organise safety and additional equipment as required (gas detectors, harness, light for night works etc).
• Surface preparation on the spools to enable the testing.
• Conduct NDT (Flexible Array Scanning Tool (FAST) or Phased Array UT (PAUT) to determine the thickness of the remaining metal in the pipe spools.
• Valves, pipework and site to be re-instated as per SA Water Standards.
• Areas made secure and reinstated as per SA Water Standards.
• Complete and submit detailed reports including observations and recommendations.