• Excavation of launch and receival shafts for tunnel boring and pipe jacking
• Tunnnelling and pipe jacking of 3369m of ID1388 PN2 SN40,000 GRP pipe
• 40m of ID525 GRP PN2 SN16,000 pipe to satellite maintenance hole KLD01 ending with backfilled construction shaft
• 15m of ID450 GRP PN2 SN32,000 to satellite maintenance hole LSB01
• 3500mm diameter maintenance hole with 4m internal drop and plunge pool, ID525 connection and ID450 connection
• 3200mm diameter maintenance hole with DN300 pipe stub
• 2400mm diameter vortex drop
• 2 x 2400mm diameter maintenance holes with 90-degree change in direction
• 2400mm diameter maintenance hole with ID1050 connection stub for Kalkallo Creek Main Sewer Stage 2
• 4 x 2400mm diameter straight through maintenance holes with internal drop pipe and pipe stub allowing for future connection of DN225 reticulation sewer

The tunnel alignment included crossings beneath Merri Creek and the Hume Freeway and a connection to an existing live sewer at Amaroo, where the tunnel boring access shaft was converted into a manhole.

Tunnel boring and pipe boring was carried out using Abergeldie’s in-house owned, maintained and operated Herrenknecht equipment.

Detailed surveying was required to confirm the line and level of new sewers and of existing sewers at tie-in positions. Close interface management wsa required with parties involved in other real estate development and infrastructure projects nearby, including the Kalkallo Development, Cloverton Development, Arrowsmith Development, Klandy Drive Branch Sewer, Lockerbie South Branch Sewer and Merrifield Central Branch Sewer.

The completed sewer is the critical outlet that was needed to service developments in the Urban Growth Boundary around Melbourne and connects into the Amaroo Main Sewer (completed in 2017).

This 3.5km of critical sewerage infrastructure supports the growth of communities in the Northern growth corridor of Melbourne.