Design and Installation

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Design and Installation

It is vital that on-site wastewater management systems are designed, installed and managed to reflect the nature of the site conditions and constraints associated with the property and dwelling. If they do not, domestic wastewater will not be treated or contained on site and the discharge will result in adverse effects off site.

Guidelines have been prepared to assist wastewater practitioners to design, install and manage wastewater management systems in a manner that avoids this situation from occurring.

Guidelines for New On-Site Wastewater Management Systems

These guidelines effectively serve two functions. Firstly, Marlborough's environment presents considerable constraints to successful on-site management of domestic wastewater, including soils of low permeability, thin soils, loess soils, high groundwater levels and unstable land.

Council has been approving on-site systems, and monitoring their operational performance, for some time. There is therefore an organisational awareness of how different on-site systems perform in such conditions.

The guidelines are designed to apply this accumulated experience so that designers and installers avoid the mistakes of the past. This is reflected in a number of design and installation standards set out in the guidelines.

Secondly, the guidelines represent current best practice in the field of on-site management of domestic wastewater in Marlborough.

Best practice evolves over time in response to new technology and better understanding of the factors that influence on-site management of domestic wastewater. The guidelines will be routinely reviewed so that they can continue to represent best practice on an ongoing basis.

These guidelines are designed as a technical resource and are not intended to be used by homeowners. Other material has been prepared for homeowners to assist them in the processes of selecting and managing on-site wastewater management systems.

Site and Soil Evaluation

The guidelines above require site and soil evaluations to be undertaken as part of the process of designing new on-site systems. The evaluation enables any constraints to effective on-site servicing to be identified and ensures that the on-site system selected is appropriate to the site conditions.

Site and soil evaluations must be completed by accredited evaluators.

The persons who have met the requirements to become accredited site and soil evaluators, (for the purpose of designing new on-site wastewater management systems), set out in Council's Guidelines for New On-site Wastewater Management Systems, are listed below.

List of Accredited Site and Soil Evaluators as at 2 September 2019

Name

Company

Town

Stephen Whyte

CGW Consulting Engineers

Nelson

Geoff Knowler

Cameron Gibson and Wells Limited

Nelson

Ross Davis

Davidson Group Limited

Blenheim

Leigh McGlynn

Davidson Group Limited

Blenheim

Ron Findlater

Findlater Construction

Blenheim

Ron O’Hara

Tasman Consulting Engineers

Nelson

Robert Cox

Enviro WW Limited

Nelson

Graham Kerrigan

Kerrigan Engineers Limited

Blenheim

Paul Wopereis

MWH New Zealand Limited

Nelson

Juliet Westbury

MWH New Zealand Limited

Nelson

John Cocks

MWH New Zealand Limited

Dunedin

Bill Noell

Pattle Delamore Partners Limited

Christchurch

Jonathan Thorpe

Opus International Consultants Limited

Nelson

Richard Evans

Smart Alliances Limited

Blenheim

Nick Meeten

Smart Alliances Limited

Blenheim

Jeff Swanney

Swanney Geotechnical and Civil Engineering

Nelson

Andrew Dakers

Eco Eng Limited

Christchurch

Dave Dravitski

Opus International Consultants Limited

Rotorua

Ari Fon

Affirm NZ Limited

Nelson

Andrew Palmer

TerraFirma Engineering Limited

Mapua

Khalid Suleiman

Seng Engineering Consultancy

Blenheim

John Higginbotham

Nelson Consulting Engineers Limited

Nelson

Anthony Chaney

Nelson Consulting Engineers Limited

Nelson

Mark Davies

Sustainable Environmental Engineering Limited

Picton

Mark Rounce

Rounce Project Solutions

Nelson

Jeremy Harnett

Smart Alliances Limited

Kaikoura

Mike Copeland

Kiwi Pioneer

Westport

Matt Harris

Davis Ogilvie and Partners

Christchurch

Hazel Pearson

Wastewater Design Limited

Takaka

Richard Lamb

Wastewater Design Limited

Takaka

Gary Stevens

GS Consulting (2004) Limited

Richmond

Craig Brown

CBC Wastewater

Waiheke Island

David Carlson-McColl

Flow Environments

Nelson

Alan Anderson

Wairau Environmental Limited

Blenheim

Tony Crosbie

Lodestone (NZ) Limited

Richmond

Jason Morgan

Wright Tanks Limited

Palmerston North

Timothy Sikma

CGW Consulting Engineers

Wanaka

Marc Jensen

TM Consultants

Christchurch

Tyrell Hayes

Smart Alliances Limited

Blenheim