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About Envirolink

The Company

As of 29 January 2021 the business has passed to two new owners:

David Carlson-McColl a Tasman domiciled civil engineer who previously operated Flow Environments Ltd and Martyn O’Cain, also Tasman based, who has operated Tasman Environmental Management for the past 10 years. Dave and Marty have brought their previous operations under the Envirolink umbrella.

All current Envirolink staff are continuing, as are our normal services. Tony is staying on in a limited capacity to assist the transition before retiring.

Dave & Marty are keen to maintain and develop relationships with both existing and future clients. There have been a lot of changes in the freshwater industry under NES and NPSFM which are presenting challenges and changes to water users across the industry, in particular the primary sector. Both Marty and Dave bring new skill sets and experience to enhance and broaden Envirolink’s capability to meet these challenges. Also of note we are pleased to announce Fleur Tiernan has joined us as a specialist in freshwater ecology whose skills and practical experience will be invaluable in this regard.

Envirolink was established in 1988. Since then the practice has experienced steady growth in its areas of expertise.

Its growing list of clients includes forestry and mining companies, primary producers, power companies, local and regional authorities, and a host of individual clients.

Envirolink is owned by David Carlson-McColl and Martyn O’Cain.

Currently with a technical staff of five, the practice has developed links with other individuals and organisations where additional skills and experience is required.

By networking in this way, Envirolink has been able to undertake a wide range of projects in a most cost effective manner.


Martyn O’Cain

Martyn is an environmental scientist with over 20 years experience in environmental monitoring and site investigations. He specialises in contaminated land investigations under the NES for Assessing and Managing Contaminants in Soil to Protect Human Health. Projects include the preparation and certification of preliminary site investigations, detailed site investigations, site management plans, remedial action plans and validation reports associated with contaminated land assessments. Martyn is a ‘suitably qualified and experienced practitioner’ (SQEP). He has a Masters (1st Class) degree in Environmental Science, a post graduate diploma in business management and is a Certified Environmental Practitioner specialising in contaminated sites (CEnvP CS).

David Carlson-McColl

David is a Chartered Professional Engineer (CP.Eng) with over 15 years of experience in the design and construction of civil infrastructure. David brings a broad perspective to projects having worked across the consulting and government sectors in Australia and New Zealand. Working for both Nelson City and Tasman District Councils, and organisations across the public and private sector, David has extensive experience across the Nelson Tasman region. David has long term working relationships with industry professionals in the Engineering and Land Development sectors to help successfully deliver your next project.

Fleur Tiernan

Fleur is a senior environmental scientist with 20 years experience in New Zealand and Europe working for a number of regulatory environmental bodies including Marlborough District Council, Auckland Regional Council and the Scottish Environmental Protection Agency (SEPA) and the Environment Agency (UK). In addition she has worked for various environmental consultancies in New Zealand. Fleur holds a Bachelor of Science degree in Zoology, a Research Masters in freshwater ecology and a Masters in Science degree in Environmental Engineering. In addition to having a sound understanding of regulatory regimes Fleur also has practical experience in monitoring and reporting on freshwater, coastal and air environments. Fleur's extensive regulatory and consultancy experience, practical knowledge and education give Fleur a unique understanding when assessing environmental effects from different activities allowing her to manage them in a cost effective, practical and sustainable manner.

Mark Hahn

Mark comes from a forestry background and his main area of responsibility is of water meter services. Mark has recently completed the NZ Diploma in Field Hydrology (Level 5)

Regan Martin

Regan comes from a background within a commercial nursery, and has had some experience in hydrology and consent compliance with West Coast Regional Council following his studies at Lincoln University. Regan is very keen to take up where he left off in the water industry and is fast coming to grips with water resource planning regional plans. He is well placed to assist with resource consenting needs in the water sector, particularly within the irrigation industry.