building settlement marker installation definition

Recorded groundwater levels and settlement have generally remained within the consented levels. In order to differentiate construction effects from normal seasonal variations, a statistical approach was developed for setting both high and low trigger levels for the 22 telemetered piezometers located in and around five sensitive wetlands. Both approaches involve significant potential alteration to the near surface groundwater system.Ī comprehensive groundwater monitoring and settlement monitoring programme was established prior to construction commencing, with some 110 piezometers to record natural variations in groundwater levels and 100 settlement monitoring points. Expressway construction required either removal of the peat beneath its footprint or preloading and surcharging of it, to manage long term settlement. Groundwater in the peat deposits is shallow and is directly connected to nearby wetlands. Approximately 50% of the Expressway earthwork footprint is underlain by peat deposits that are typically 0.5m to 8.0m thick and are characterised as very soft, highly organic and compressible. The Expressway runs in close proximity to several wetlands of significant ecological and cultural value with unique fauna and flora, and to transport infrastructure and residential buildings built over peat deposits. The Mackays to Peka Peka Expressway is part of the Wellington Northern Corridor, identified as a Road of National Significance for New Zealand.

Building settlement marker installation definition