Turpentine Road Upgrade (Stage 2 & 3)
Select Civil was awarded two separate Shoalhaven City Council contracts to complete the Turpentine Road Upgrade works, connecting Princes Highway Tomerong to Braidwood Road, and streamlining the route from the Jervis Bay Region to Canberra. Totalling $6.44 million, the two stages involved the upgrade and realignment of 8.3km of unsealed gravel road, shoulder widening, increased pavement quality and sealing for long term protection and increased safety to users.
The scope of works for this project included:
- Environmental protection of 3 endangered habitat areas
- Tree clearing 8.3km of dense native woodland and open forest
- Service protection and relocation
- Stormwater drainage works and outlet control
- Bulk earthworks
- Sub-grade stabilisation using lime binder
- Flexible pavement construction
- Bituminous surfacing
- Line marking and completion of ancillary works
Significant sub-grade material quality problems were encountered throughout both stages of the works, due to moisture conditioned slope-wash making up much of the existing road foundation. Collaboration between Council staff and the Select Civil engineering and construction team led to the design and successful installation of a Geofabric lined rock mattress, bridging over the unstable lower ground. The end result was a cost effective and stable foundation treatment that allowed for the construction of original pavement design without sub-grade heaving, deformation or failure.
Traffic management was critical through both projects, as Turpentine Road was to remain operational during construction activities. Substantial planning and monitoring of traffic management and controls were employed to ensure the safety of all site personnel and road users. No significant traffic incidents were observed during Select Civil’s twenty month presence on site.
Turpentine Road Upgrade Stage 2 was delivered on time in April 2016, and Stage 3 in November 2016 – 3 months ahead of program. Both projects were completed within Council’s cost budget, and to their satisfaction.