Otara Stopbank Upgrade

Tenders are invited from suitably qualified construction contractors for the works described in the Scope of Works.

The project comprises two distinct portions:

• Portion 1: CH 1040 – CH 1670
• Portion 2: CH 0 – CH 1000

Each portion must be priced independently. Portion 2 is included for pricing purposes only and may be excluded at the Principal’s discretion if costs exceed the project’s budget.

The works generally include:

• Construction methodology that ensures reinstatement to the required level of flood protection (as specified by BOPRC) if a flood risk is forecast within three days.
• Staged delivery of the two separable portions without overlap.
• Site security and public safety at all times, including temporary access and diversions where required.
• Location and protection of existing services.
• Project management and site supervision, including environmental controls and traffic management.
• Stopbank works: topsoil stripping, stockpiling, borrow pit stripping, realignment, widening, and topping-up.
• Replacement and upgrade of culverts, including associated structures and reinstatement.
• Removal and reconstruction of floodwalls in accordance with design specifications.
• Compliance with Erosion and Sediment Control Plan and consent conditions.
• Groundwater management and dewatering for excavations.
• Reinstatement of six ramps along stopbanks, including bollard removal and replacement.
• Engagement with landowners and the public to minimise disruption.
• Preparation and submission of as-built drawings.
• Other miscellaneous works as described or implied in the specifications and drawings.