Client : Auckland City Council and Manukau City Council.
Discipline : Multi
The $22 million Auckland MRF processes kerbside
recyclable material from Auckland and Manukau
City. In 2008 this equated to 265,000 households or
770,000 people - around 20 % of the New Zealand
population. The MRF was constructed in 2007/2008 on
part of the former Galway Street landfill in Onehunga
and operations commenced on 30 June 2009.
The MRF processes 85,000 tonnes (500,000 cubic
metres) of material per annum. The modular design
allows for a straightforward upgrade to double the
original capacity. The MRF education centre is a core
component of the waste minimisation message being
taught in schools and to the wider community.
T&T was the principal consultant for the project.
This project involved the preparation of resource
consent applications for development of Stage 2 of
Silverstream landfill. Stage 2 extends the life of the
current landfill by approximately 50 years.
The project did not require a resource consent
hearing. This is a reflection of the effective
consultation and the involvement of Hutt City
Council in ensuring the potential effects of the
landfill were clearly identified and the proposed
mitigation measures satisfied adjoining residents.
There is ongoing involvement with landfill operation
ensuring compliance with resource management
conditions through undertaking monitoring
programmes and preparing environmental
management plans for landfill operations.
Ongoing work for the Hamilton City Council relating to landfill gas control measures, resource consenting, and ongoing maintenance and monitoring of Rototuna and Willoughby Street closed landfills within Hamilton City.
Identification and assessment of options to replace a sludge drying pond, an integral component in the waste disposal system for the Kinleith Pulp & Paper Mill. A solution was identified and constructed resulting in significant improvements in the performance and operation of both the existing and new sludge drying ponds.
Assessment of disposal options for solid waste (sludge) produced by the Kinleith Pulp & Paper Mill effluent treatment system. The study led on to design and resource consents for expansion of an existing sludge disposal landfill and development of a second landfill up valley. The landfills are created by dams across a valley and include dewatering systems to promote consolidation of the sludge.
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.
Site B Contaminated Site Rehabilitation - Hazardous Waste Containment Cell
Client : Carter Holt Harvey.
Discipline : Multi
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.
The Bluegums Landfill Site, located only 4 km
from the city of Blenheim, was selected in 1995
to provide residual solid waste disposal for the
growing Marlborough region. Initial development
of the site identified the need for a robust
engineering approach due to the site’s difficult
ground conditions and topography.
Tonkin & Taylor has assisted Marlborough District
Council with progressive development of the
site to what is today a state-of-the-art, highly
engineered and very efficient landfill site.
Client : Ministry of Housing and Local Government, Government of Malaysia.
Discipline : Solid Waste
The Bukit Tagar Sanitary Landfill in Selangor, Malaysia is an approved government privatisation project based on a build-operate and transfer proposal. Situated 50 km north of Kuala Lumpur within the State of Selangor, the site is accessed through the Bukit Tagar Interchange on the main North South Expressway. The landfill has a potential capacity of 120 million tonnes of waste and will serve the major population base of Kuala Lumpur City and the Klang Valley (population 8 million).
A 40 year concession to construct and operate the landfill has been awarded to KUB-Berjaya Enviro Sdn Bhd.
Commissioning of the new Canterbury
regional landfill at Kate Valley in June 2005
was the culmination of more than five years
of investigation, planning, design and
construction effort.
The project is a cooperative venture between
five territorial authorities including Christchurch
City (pop 800,000) and two private sector
waste companies.
Carter Holt Harvey Ltd implemented a “one-off” landfill solution to dispose of a range of stored
wastes associated with processing and treatment
of timber in the Kinleith area, and from its other
sites in New Zealand. The project comprised:
Construction of a fully lined landfill in an old
quarry (Sprinkler Quarry Landfill) to contain CCA
treated wood shavings that had previously been
stockpiled nearby
Removal of wastes from “Site A” for disposal
on the larger “Site B” (Sites A and B being two
historical disposal sites in the area)
The Landfill Full Cost Accounting Guide and
associated Model were developed as a key plank
in the Ministry for the Environment’s landfill
programme, aimed at getting both industry and
New Zealand-wide recognition of the full cost of
landfill disposal of solid waste. This was a critical
step in achieving realistic pricing of waste disposal
systems - an essential step towards closure of
sub-standard landfill sites, proper provision for
site aftercare and closure costs, and critically, in
providing a major spur for recycling and waste
reduction initiatives. Simply put, recycling
initiatives were formerly doomed to failure given a
situation where the actual cost of landfill disposal
was neither recognised, nor being properly
provided for.
Tonkin & Taylor has undertaken a range of landfill gas (LFG) design and upgrading projects. Work ranges from greenhouse gas-related assessments, to wellfield designs and system optimisation.
The New Zealand Steel mill at Glenbrook, south of Auckland is a major regional industry. The
production of a range of iron and steel products
totalling approximately 650,000 t/yr generates
a large amount of waste and slag by-products. The mill runs a rigorous waste minimisation
programme and large volumes of slag are
processed for use as high quality basecourse and
drainage aggregate.
The New Zealand Landfill Guidelines were republished
in 2000 and were a collaborative effort
between the Centre for Advanced Engineering
(University of Canterbury), Government, district
and regional councils, and the commercial sector.
The Guidelines outline key requirements with
respect to applicable legislation and best practice
for landfill siting, design, construction, operations
and monitoring. The Guidelines are intended to provide flexibility
in the approach that can be taken, particularly
to design of liner systems and other landfill
components, while maintaining alignment with
key Resource Management Act objectives and
sound landfill engineering practice.
The Redruth Landfill owned by Timaru District
Council is located on low-lying estuarine flats
adjacent to a recreational water body known as
Saltwater Creek. The site has been in use since
the 1940s and in 1996 the Stage 2 development
was modernised to incorporate liner and leachate
collection systems. The consents for the site allowed for Stage 3/4
to be developed in a similar way, but it was
recognised that the existing liner and leachate
collection system no longer reflected modern
landfill design practice and the stage 3/4
design was upgraded to provide a best practice
engineering solution.
Redvale was the first privately owned Landfill to be developed to serve the growing Auckland
metropolitan area. The Landfill, located to the
north of the city, accepts municipal solid waste
from a catchment of over half a million people
and containing a large proportion of Auckland’s
major businesses. Redvale Landfill is uniquely located in a thick
“pod” of very low permeability mudstone and
muddy limestone rock. Re-worked site materials
are used in conjunction with the natural materials
beneath the site to provide a landfill with
unsurpassed containment qualities. Redvale
Landfill is now a key component of Auckland’s
regional infrastructure and operates to the
highest standards.
The challenge of the Brady Road landfill closure
project was to arrive at a solution that met client
requirements and also satisfied community
and stakeholder expectations, mindful at the
outset that the site was a disused landfill with
approximately 50 percent of the area having little
or no landfill cover. The result of the rehabilitation project - the
Seaside Park complex, displays a range of
innovative features covering landscaping and land
use concepts, design, and construction practices.
Stage 1 of Silverstream landfill has been in
operation for over 30 years and the extended area
of the original development (Stage 1A) is due to
close early in 2007. The current landfill will be
replaced by a new area of landfill development
(Stage 2) that will open in late 2007. The landfill
extension will be the only landfill in the Wellington
Region that complies with the proposed MfE Class
A landfill requirements.
Tonkin & Taylor International undertakes a wide range of planning, consent and infrastructure design for all types of waste projects. These have included advisory studies for waste management and composting in Tuvalu (ADB), landfill siting studies in Fiji and Papua New Guinea, greenhouse gas and waste inventory studies in 12 Pacific Island countries, and advisory input to landfill operations and leachate treatment in Fiji. Tonkin & Taylor International have also provided technical support to the Fijian Ministry of Housing on strategic waste issues.
The Whitford Landfill is a key element of Auckland’s solid waste infrastructure and from mid-2005 was the sole remaining municipal solid waste landfill on the Auckland isthmus.
The landfill has operated with modern engineering and management systems since 1994 and is now a state-of-the-art facility serving the major urban area of Manukau City and its surrounds - a base population of nearly half a million people, and
containing a significant proportion of Auckland’s light industrial base.
