Revitalising Auckland's Civic Administration Building

Lead Primer Removal and Intumescent Coating

This project aimed to reinvent Auckland’s iconic Civic Administration Building from a stalwart of local government to a vibrant mixed-use development in the heart of the central business district – the cornerstone of the Civic Quarter development. By renovating the building whose original use no longer best fit the location or design, the developer opted to repurpose the property and retain most of its internal structure and steelwork.

What we did

InterGroup was initially engaged by Naylor Love to undertake corrosion protection and intumescent coatings on the in-situ steelwork, initially beginning work on the perimeter of one of the towers. The scope of works was increased to include fireproofing and corrosion protection of the entire tower and adjacent basement area.


During the demolition process, it was discovered all steel within the building had been coated with a primer containing lead during the initial construction in the mid 1960’s. This significantly impacted on the construction programme and extended the scope of works to include the encapsulation, extraction and urgent removal of lead affected areas. The work was further complicated and delayed by the Level 4 COVID-19 lockdown enforced in Auckland in August 2021.

Management and removal of the lead primer became a very expensive and drawn-out process, with the implementation of lead contamination protocols such as capturing all airborne contaminants from the manual scraping and removal of the affected primer and the requirement for decontamination showers, PPE and additional manpower for the manual removal method initially adopted.

The Level 4 lockdown in August 2021 put a halt to all works on site. Once Auckland was moved to Alert Level 3, contractors were allowed back on site but working under strict Covid-19 safety protocols with restrictions on the number of contractors able to be on site at any given time, and additional PPE and precautionary protocols put in place and stringently adhered to.

Adding value through innovation

InterGroup investigated and offered an alternate removal process to assist the client in mitigating the cost and time impact to the project of continuing the manual lead primer removal process. We introduced the use of a revolutionary paint removal system specifically formulated product designed to remove multiple layers of paint in one application. The product was applied to the steel components, encapsulating, lifting, and removing the lead primer. The use of this system meant a reduction in the level of management required to remove contaminants, providing cost and time efficiencies for the client by reducing the labour requirement and encapsulation costs.

Overall performance

Despite the delays to the overall programme caused by the lead primer, InterGroup completed our scope of work on time and to budget maintaining a strong health, safety, quality and environmental focus.

New Resource Recovery Facility Construction Underway

Construction of InterGroup’s brand new Resource Recovery Facility is underway!

InterGroup is excited to announce construction of our new, state-of-the-art resource recovery facility is well underway at our Auckland premise. This wet processing plant will be equipped with world-leading dewatering technology with the ability to clean and grade aggregate material – providing maximum recovery and diversion from landfill.

The Challenge

The New Zealand Infrastructure Commission has found that waste from construction makes up between 40 to 50% of all waste sent to landfill – around 4.4 million tonnes annually from construction and demolition sources.

InterGroup, as a leading provider of industrial and infrastructure services to local and central government and private entities, is invested in improving waste diversion through our activities and across the sector.

Waste generated by street sweeping and hydro excavation activities in particular pose challenges when it comes to disposal. This is due to the mixing of materials and contamination levels. To mitigate this, InterGroup has invested in a number of dewatering plants in recent years, going some way toward reducing the volume of waste we send to landfill. However, these plants are limited in their capability to support recycling and reuse. Given this, InterGroup has thoroughly investigated options to improve our waste management – and to contribute to improved environmental outcomes across the sector.

 A Schematic Snapshot of Our Future Facility

Our Solution

InterGroup is constructing an industry-leading resource recovery facility at our Stonedon premise. The technology we have incorporated is world-leading, and a first for New Zealand, with:

  • A dedicated tipping station to ensure maximum dewatering and processing of slurried waste materials. This will produce clean reusable sand, aggregate, and water products.
  • A water cleaning and treatment system which allows up to 90% of process water to be recycled and immediately re-used within the plant.
  • A scrubbing and filtration system that carries out pre-screening, scrubbing, organics removal, sizing, stockpiling, fines recovery and filtrates removal; and
  • A two-stage separation and classification system which includes high-pressure washing to effectively remove contaminants and provide the highest possible quality of final products.

For us, and our customers, this will result in enhanced recycling outcomes and an impactful contribution to achieving waste reduction targets.


The Key Benefits Of Our Facility

  • Partnering with CDE means our facility benefits from the guidance, technology and innovation of global leaders in materials wet processing. CDE has refined their knowledge and products over 30 years in business and delivered over 2000 waste processing projects worldwide.
  • As NZ’s leading wet processing plant it will provide the opportunity to reuse material avoiding disposal to fill facilities.
  • The ability to reuse materials in infrastructure activities will contribute to greener construction.
  • Will support enhanced environmental outcomes with tangible reductions to align with our customer’s environmental targets and support industry wide targets.

Why Choose Us?

This facility is more than just a dewatering plant. It is a comprehensive solution which will clean and process solids – transforming them into high-quality aggregate and sand. These outputs can then be reused on projects.

Employing the most innovative technology on the market, supplied by CDE – global leaders in wet processing solutions for waste recycling and mineral processing – this facility will support maximum retrieval and reuse, and will ensure InterGroup’s new waste processing facility sets the standard in the New Zealand market.

0800 468 379
Mailing Address
PO Box 58087, Botany
Auckland 2163