52 | Improving waste disposal in Grey District McLeans Pit Landfill is located approximately six kilometres northeast of central Greymouth. Grey District Council: McLeans Pit Cell 3B T T Richard Loader “Another key driver is to further work towards meeting GDC’s Waste Minimisation and Management Plan and central government waste-reduction targets.” REGIONAL DEVELOPMENT The Grey District Council’s (GDC) development of Cell 3B, currently under construction at the McLeans Pit Landfill, will enable the continuation of critical solid waste disposal services within the Grey District, while providing resilience to the area and region. The modern landfill design will ensure security of the waste mass into the future, along with improved leachate treatment. The overall investment into the project is around $2M. McLeans Pit Landfill is located approximately six kilometres northeast of central Greymouth, and is the location of solid waste disposal and recycling processing for the Grey District. The location has been used for solid waste disposal since opening in 1997. Cell 3B is one of five consented cells on site. Cell 3 was constructed in two portions; the first portion (Cell 3A), commenced operation on 1 June, 2019. Once constructed, Cell 3B will provide a volume of 71,600 cubic metres of air space and have a life expectancy of 9.5 years, dependent on waste volumes over that time frame. Kurtis Perron-Smith, GDC’s utilities and infrastructure manager says a key driver for the project was ensuring a modern ‘Class A’ landfill is available to serve the district’s needs, while council works to reduce waste levels to landfill, and improves the levels of recycling and diversion of materials that can be reused. “Another key driver is to further work towards meeting GDC’s Waste Minimisation and Management Plan and central government waste-reduction targets.” The project includes the excavation of the area, preparation of surfaces, processing of mudstone and gravels, installation of groundwater/stormwater drainage, installation of multiple layers and liners to ensure security of the waste mass, and the construction of a modern Class A landfill. It also includes a leachate drainage system, and pumping, along with the upgrade of the existing leachate treatment facility on site, ensuring GDC can continue to meet its resource consent compliance requirements into the future. “This element of the project saw significant planning, to ensure that leachate being produced from the existing operating landfill cells could still be received and treated, while the work was being completed on the treatment system,” says Kurtis. “Council identified Southwater Dredging & Water Treatment (nominated subcontractor), as a key partner to provide temporary treatment processes onsite during the works. Handling the leachate flows through a temporary treatment process onsite has made the upgrade of the existing treatment systems straightforward for our contractor. It has provided significant confidence to council, and to the regulatory authority, during the works. It was critical that treatment levels were not adversely affected during the upgrade works.” Greymouth-based Stantec New Zealand was engaged as project designer/engineer and Hokitika-based Henry Adams Contracting was awarded the contract to build Cell 3B and associated work, following an open tender process. “Council’s partnership with designers Stantec NZ, has ensured that council can realise and achieve its objectives to ensure landfill design meet the highest standard and is fit for purpose. “The overall partnering between council, Stantec NZ and contractor Henry Adams Contracting has made the process of achieving council’s objective, straightforward and hassle free.” PROUD TO BE LEAD CONTRACTOR ON GDC MCLEANS PIT CELL 3B BUILD 027 4310 461 OR 03 755 8448 admin@henryadams.co.nz
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