Ormiston Road, Flatbush Subdivision

This $50 million dollar residential subdivision involved 50 rural residential lots spread along ridgelines with associated roads, retaining walls, services and a bridge. The subdivision is located in the Southern Landslide Zone and includes a Transpower easement passing through the subdivision.

LDE provided services from conception to completion of this project to ensure the client could deliver stable building platforms for each lot in a cost effective and expedient manner. The services provided included:

• Geological mapping to define the geotechnical model for the site, supplemented with additional site investigation to support detailed design and resource and building consents • Detailed slope stability assessments and involvement in the earthworks design process • Design of in-ground (palisade) walls to protect proposed building platforms from adjacent slip features, and design of cantilever retaining walls to facilitate road construction • Geotechnical input into accessway bridge pile foundations and stability of abutments • Construction observations throughout the subdivision earthworks, drainage and retaining wall construction works • Completion reporting and sign-off documentation for the subdivision