Welcome Bay Road Roundabout

A new roundabout at Welcome Bay Road and Waitaha Road, built under traffic on an arterial route. It ran at the same time as the Oceanbeach intersection upgrade, both in construction through 2024, so each week was planned around the matters that could only be settled on site.

I was Engineer’s Representative, subcontracted to Tonic Consulting as Engineer to the Contract.

The footpath that couldn’t meet the code

On the west side of Waitaha Road the existing footpath couldn’t meet the council’s 3 per cent crossfall requirement and still tie into the driveways. I worked up a compromise detail, a maximum 6 per cent crossfall with a 2.5 m minimum width and regraded driveways, drew it up, agreed it with the council’s safety team and instructed it as a variation. The notice flagged the residents whose driveways would be cut back.

What I did on this project

• 69 notices to the contractor, 8 notices to the Engineer, 24 variations, 7 payment schedules, 3 extensions of time and 22 weekly reports
• Structural asphalt quality investigation, reading the mix design against the core certificates and confirming the binder grade from the validation data
• Instructed additional coring and testing to the standard the council’s independent reviewer required
• Developed and instructed the footpath crossfall detail, agreed with the council safety team
• Went back to site to remeasure before a monthly claim was certified and resolved the differences with the contractor item by item
• Assessed variations under my own signature, correcting quantities to the drawings and recording the reason against each adjustment

Project details