Road Stabilization Project for Land Slip Repair on Fairburn Road

The works pertain to the stabilisation of a land slippage on Fairburn Road at RP9593-RP9743. The project comprises of two anchored timber pile retaining walls and one cantilever timber pole retaining wall to repair an existing slip and improve the overall stability of the road. The contract includes the following: 1) All necessary earthworks to form a working platform for wall construction.

This is expected to comprise of approximately 993m? of cut which includes drill spoil. This excess material shall be disposed of offsite to the satisfaction of the Far North District Council. 2) Construction of �Design Section F� timber pole cantilever retaining wall consisting of 32x �450mm SED 52MPa bending moment capacity and 450kg/m3 minimum density @ 1.0m CRS.

Piles are 8.0m (long) in a �750mm hole and encased in 20 MPa concrete. 3) Construction of �Design Section G� anchored retaining wall consisting of 20x �350mm SED 52MPa bending moment capacity and 450kg/m3 minimum density @ 1.2m CRS. Piles are 8.0m (long) in a 4) �600mm hole and encased in 20 MPa concrete.

Anchors are to be BluGeo GRP60 �32mm bar or equivalent centrally spaced in �150mm and grouted minimum 3.0m into underlying rock. 5) Construction of �Design Section H� anchored retaining wall consisting of 25x �450mm SED 52MPa bending moment capacity and 450kg/m3 minimum density @ 1.2m CRS. Piles are 10.4m (long) in a 6) �750mm hole and encased in 20 MPa concrete.

Anchors are to be BluGeo GRP60 �40mm bars, centrally spaced in �150mm and grouted minimum 4.0m into underlying rock. 7) Reinstatement of the road following remediation works