Construction of the eight storey Westpac head office building within a 3000 m2 historical block of reclaimed land in the Britomart Precinct. The development included a three-storey basement carpark, the design and construction for which had to address historical reclamation features, contamination and the potential for groundwater drawdown to affect adjacent Scheduled Historical Buildings. Tonkin & Taylor’s specialist inputs on the project included detailed discussions with Auckland Regional Council to ensure the project could proceed without risk to surrounding structures and the environment.

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A former landfill on the banks of Oakley Creek was redeveloped to provide a much-needed community reserve. Steep slopes with exposed refuse and unsightly leachate were remediated to provide a safe stream-bank walkway, and a playing field was developed above. Innovative geotechnical and groundwater management solutions were required in a tightly constrained site.

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Various projects for private companies and local authorities investigating, assessing and managing the risk of contamination. Small and large scale projects are undertaken throughout New Zealand involving historic land uses such as horticulture, sheep dipping, timber treatment, uncontrolled filling or dumping and other industrial land uses.

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Closure and redevelopment of the former Hobsonville Airbase in the northwest Auckland at the head of the Waitemata Harbour. The site covers approximately 167 hectares and is proposed for mixed housing, a marine precinct and two new schools. Our work involved investigation and rehabilitation of isolated areas of contaminated soil for the redevelopment, such as the former battery store, buried waste

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Assessment and characterisation of a 250,000 m3 contaminated wood waste stockpile, options and feasibility study for disposal options. The study led on to conceptual and detailed design for construction of a landfill in a nearby disused quarry to receive the wood waste. Tonkin & Taylor was responsible for securing resource consents, completing detailed design, contract documentation and construction management and supervision.

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Assessment and characterisation of a former waste disposal site, development of rehabilitation options including the design and construction of a hazardous waste containment cell to receive hazardous wastes from this site and a number of other hazardous waste sites around New Zealand. Tonkin & Taylor was responsible for securing resource consents, completing detailed design and construction management and supervision.

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Re-development of a former gasworks site on the fringe of Auckland's CBD to provide a prestige apartment and town house residential precinct. Contaminated soil was largely managed by onsite geomembrane containment. This unique and innovative approach was critical to the projectís financial viability. Ground water contaminant discharges were managed by a mix of barrier and interception methods. Construction impacts were managed with odour suppressant and stormwater treatment systems. Post construction monitoring confirmed nett environmental benefits on and off site within a short period after construction.

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A major leak from a fuel oil storage tank to groundwater and an adjacent river occurred at Chevron’s main Philippines oil terminal. Intrusive investigations confirmed leaks from several tanks were contributing to large dissolved and separate phase plumes. T&T supervised emergency remediation works to intercept and recover approximately 80,000L of separate phase product before it affected the river. Liaison with regulatory authorities and prompt action enabled the terminal to continue operating throughout.
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Closure, partial demolition and rehabilitation of a former coalfired power station for commercial use. Building rehabilitation included removal of asbestos, switchyard and conveyor belts and construction of stormwater systems to operate without pumping. A refuse landfill, asbestos disposal site and ash ponds were rehabilitated for agricultural use.

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A diesel spill from a service station underground storage tank impacted a shallow aquifer, discharging to surface in a park beside a childcare centre. Tonkin & Taylor provided emergency response services, tracing the source of the spill, installing emergency and then long term remedial systems, liaising with District and Regional Council staff.

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