Lakeside Development Wastewater Treatment Plant: Assessment of Effects

Developers of a proposed residential development (1600 residential lots) at Te Kauwhata, which included a private wastewater treatment plant (WWTP), approached Streamlined Environmental to prepare a technical assessment of potential ecological effects of the wastewater and stormwater discharge. Assessment of Environmental Effects (AEEs) for the proposed development, covering effects of the development only, and in combination with the existing Te Kauwahata WWTP combined were prepared in order to provide a comprehensive assessment.
The team, led by Dr Mike Stewart, with the help of Dr Chris Dada and Dr Tim Cox provided guidance to the applicant on the appropriate science needed to support their resource consent application.
The first AEE investigated the effects of wastewater from the proposed development and the existing Te Kauwhata WWTP, and the second focused on wastewater from the proposed development only. Chris developed Quantitative Microbial Risk Assessment models for both options, determining the level of treatment required to meet water quality standards and minimise human health risks. Tim developed a water quality model to assess effects of the proposed discharge on Lake Waikare, the receiving environment for this discharge. Assessments incorporated aspects of fieldwork, laboratory analyses and desktop risk assessments on water quality (nutrient, metals, emerging organic contaminants. After completion of the scientific assessment Mike was an expert witness for the 2018 hearing, providing evidence to inform the decision-making process.
The extensive analysis and support undertaken by our team resulted in the landuse change being approved and the development, wastewater treatment and stormwater treatment plans were able to go ahead. Subsequently, Lakeside was the first private wastewater treatment plant approved for use in the Auckland Region.

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