Wastewater


Countdown Supermarket, Waiheke

Wastewater 400
Wastewater design and consenting documentation was prepared for a large format supermarket in a rural, non-reticulated area of Waiheke Island.  Constraints included the discharge into a sensitive environment, the requirement to maximise the supermarket footprint whilst still providing adequate land area for treated effluent discharge and other services, and a lack of published data for the design of a supermarket on a non-reticulated site.  Design information was obtained from novel sources, including the existing Waiheke supermarket and modern urban supermarkets.  Although smaller and older, the data from the existing facility was scaled-up and combined with other data sources to create a robust model for the anticipated design flows for the new building.  Following an extensive consenting process, a discharge consent for the site was granted and the supermarket is currently under construction.


Kaukapakapa Structure Plan

Kaukapakapa 400
Provision of supportive information to Council for the Kaukapakapa Structure Plan to ensure sustainable and suitable development for new village and rural residential lots.  The community currently has no available connection to a municipal treatment plant, therefore lots are reliant on on-site or small community wastewater treatment and land application alternatives.  Work involved the analysis of a number of aspects of the local area (geology, soil profiles, flooding, groundwater, and surface water) to create a model that could be used to recommend the most appropriate minimum lot size in the area that could support an on-site wastewater treatment and discharge system for a modern, modest dwelling.


Karaka North Subdivision

KarakaSubdivision 400
It is proposed to construct one of the largest residential and commercial subdivisions in Auckland that will be reliant on on-site wastewater treatment and discharge within a single decentralised treatment plant. The plant has been carefully designed to discharge to a single application system on land currently used for cropping and cattle (dry stock and dairy). The discharge area is surrounded by dairy farms and sensitive stream and tidal environments. The irrigation system design incorporates groundwater control measures to cater for a 100m3/day+ wastewater discharge system, and includes extensive pre- and post-construction groundwater level and quality monitoring.  An assessment of nutrient discharges (overseer model) and groundwater flow review, as it pertains to pathogen survival for the protection of neighbouring dairy farms, has been undertaken.  The design was submitted to Council and consent has been granted.

 


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