Stopbank
Boulcott Hutt Stopbank
Project Overview: Construction of 1.7km of stopbank including bulk earthworks, drainage, flood walls, retaining walls, roading realignment, fencing and finishing.
Work included moving the stopbank and increasing the size of the stopbank using river run from the Hutt River, existing material and imported material. It also involved moving and/or reconstructing the stopbank through the live Boulcott Farms Heritage Golf Course.
Very Public site. Had to manage many pedestrians on a daily basis. Close to houses 52 properties within 75m and 17 within 10m of the toe of the stopbank. Also a school close to worksite. Very strict notice of requirement conditions enforced through the resource consent process including detailed noise and vibration consideration plans. Constant monitoring of river levels, and melling substation adjacent to worksite meant we had a large number of high voltage services to contend with.
All clearing including felling large quantities of old man pine trees and pruned pine up to 1m in diameter.
Erosion & Sediment Control
GWRC requirements were met
Work was within the flood plain so controls were silt fencing and temporary grit traps
Strict noise, vibration, and dust restrictions had to be met.
Cyanobacteria strategy in place.
Earthworks
Approximately 175,000m3 of fill placement including imported fill from Belmont Quarry, fill from the Hutt River and cut to fill from existing stopbank material
Approximately 70,000m2 of topsoil strip and respread
River run extracted from the river by digger dumper operation – involved multiple river crossings
Goodmans negotiated with and then self performed the extraction from Belmont Quarry
