Route R61 - Tombo to Port St Johns Eastern Cape South Africa:

The project comprised the reconstruction and realignment of 22 km of the road to an all weather surfaced standard. The first section traversed the steep eastern escarpment. The next section traversed the wide flood plain of the Mngazi river while the last section traversed the indigenous Dwalana forest and then the steep right bank of the Umzimvubu river. Some of the more notable geotechnical features of the project were :

	Extensive geotechnical investigations of the unstable slopes of the escarpment
	Investigation of embankment settlement potential on the flood plain
	Design of the containment of high fills with “Reinforced Earth”, gabion and concrete retaining walls and provision of extensive drainage systemss
	Design of large cut slopes and rock fall protection measures
	Erosion protection measures along the banks of the Umzimvubu river
	Wick drain stabilization of the flood plain embankment foundations and early construction to induce settlement
	Environmental protection measures through the Dwalana forest

HHO Africa were responsible for the following geotechnical consulting services :

	Geotechnical investigations for the stability of the proposed road cuts and fills
	Bridge foundation investigations
	Location of borrow pits and testing of proposed construction materials
	Materials utilization plans
	Monitoring of cut and fill construction
	Co-ordination of environmental scoping