JFC were chosen to develop the Park Avenue site into 28 lots with full infrastructure. The site was an infill subdivision on steep terrain in Birkenhead, which provided several challenges. In addition to the terrain, the site was bisected through the middle with a watercourse and various protected flora. Part of the site works were satellite to the main site, which involved access constraints of a narrow residential road. Careful staging of the build was required to ensure logistic al access to the work faces and maintaining the natural environment.

The earthworks involved detailed staging due to the required fill being obtained mainly from civil infrastructure work. Fill placement was meticulously planned to ensure access to on-going work fronts. The earthworks progressed successfully through a wet winter and involved maintaining environmental controls for the monthly WEA process.

Scope of Works

• Bulk earthworks of 9,000m3 which involved detailed planning and staging of the fill works as outlined
• Installation of 5m deep counterfort drains to improve ground stability by controlling ground water levels
• Construction of various palisade walls up to 10m deep x 0.5m diameter of steel/concrete or timber pile construction
• Construction of various styles of retaining walls, including pole/rails, masonry blocks and Allen blocks
• Construction of a bridge through the water course in winter, involving piling and casing up to 8m x 0.75m diameter, and manufacture and installation of 14 x 15m long double hollow core precast beams.
• Construction of a 380m3 stormwater detention tank structure
• Installation and coordination of utility services, including pressure sewer