The ASTT wishes to advise that this will be the last webinar this year and that once again it will be FREE.
The webinar will be a joint presentation by Barnabas Ilko, Principal Structural Engineer and Trevor O'Shannessey Principal Geotechnical Engineer  from Golder Associates. The webinar is entitled "The Gold Coast Seaway Project – Works Design Challenges” and will be held on Thursday 25 November at 13:00pm (Eastern Daylight Saving Time) and concluding at 14:00pm

Abstract of Presentation
The City of Gold Coast required and upgrade of the existing recycled water release system at the Southport Seaway, to accommodate continuing population growth. The project solution included a pipe capable of transferring 6,300 l/s of recycled water from the mainland across the Broadwater seaway via a marine pipeline to an outfall located off South Stradbroke Island. In order to protect the waterways from environmental impacts, an alternative construction method to the original dredged pipeline plan was proposed by the builder John Holland and their specialist subcontractor Bothar Boring and Tunnelling Australia (Bothar). This alternative adopted trenchless construction using micro tunnelling (MTBM) methods. 
 
The project involved the tunnelling of two (2) separate drives, the first being a 1385 m length of bored tunnel beneath the Broadwater Seaway between Quota Park on the mainland and South Stradbroke Island. It included the construction of two deep shafts and a 2.5 m (OD) reinforced concrete carrier pipe that was installed with pipe jacking techniques. The second drive involved a trenchless 617m crossing between Quota Park and O’Connell Park, including a section beneath Biggera Creek that was constructed using pipe jacking and micro tunnelling using a 1.940 m (OD) glass-reinforced plastic (GRP) pipe.
 
Golder was engaged by Bothar to join the project team and provide temporary works design support, design services for the tunneling works, construction support that included site attendance across both drives. This presentation will discuss some of the challenges from the designer’s perspective.
You are invited to a Zoom webinar. Click on the link under to join this webinar:
https://us02web.zoom.us/j/82338590789?pwd=NW1mUFJsSlFZRlliY1JOck5wSzdTQT09
As an online attendee, you will be able to attend the webinar from anywhere and will be able to submit questions that will be answered at the end of the presentation.
If you experience difficulties in joining this free event, then please email Jeff Pace, ASTT Secretary on secretary@astt.com.au for assistance.