Contractors move on to wastewater treatment plant

Physical works for the new wastewater treatment plant are about to begin, little more than a fortnight after tenders for the city’s biggest infrastructure project in 40 years were approved.

From today [subs: Monday], when HEB Construction takes possession of the Banks Street site, work will start on clearing and fencing off the construction site and adjacent lay-down area where equipment and materials will be stored.

Project manager for the Gisborne Wastewater Project, Peter McConnell, said HEB Construction had a tight but achievable timeframe to have the treatment plant built and commissioned by 31 December 2010. A building consent has just been granted.

“The initial key to meeting this date will be to ensure the contract progresses quickly in the first three months. Between now and January, HEB will be preparing the site, fencing off the area, establishing site offices and water, sewerage, power and telephone services, and demolishing the concrete base of the old truck servicing building. This will prepare for foundation improvements due to start on 11 January.”

The site will become HEB Construction’s base for the next 12 months or more. The Auckland-based company won the combined tender to build the city’s new wastewater treatment plant and the main industrial separation scheme, which takes wastewater from separate industries’ on-site schemes to the outfall pipe. These schemes will run concurrently with the western industrial separation scheme, to be constructed by Downer EDI Works.

Earlier this month, Council approved tenders totalling more than $3m for the supply of mechanical equipment essential to the wastewater upgrade including screens, pumps, standby generator and plastic media for the biological trickling filter.

“Council and CH2M Beca will continue working together with three engineers providing day-to-day supervision and observation of the contractors and physical works. Beca specialists, who prepared the original designs and specifications, will provide technical assistance, often remotely using advanced technology from the Banks Street site.” Special attention will be paid to issues including vibration, dust suppression, noise and discharges to Waikanae Creek and road channels resulting from stormwater and water used in site excavation, Mr McConnell said.

“We have informed nearby industries and residents about what will be happening. As well, Council and HEB Construction will monitor noise and vibration levels to ensure they do not exceed the levels detailed in the work plans. Together with HEB, we will work to minimise disruption to industry and ensure public safety.”