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Hydrogeology & HydrologyPukekohe Municipal Water Supply
Project Summary Recommissioning of the Pukekohe municipal supply which abstracted water from Hickey’s Spring and two deep Kaawa aquifer bores. Services Provided Project Conclusion Successful consenting of the water take consent as part of Watercare’s response to the 2020 drought conditions.
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Hydrogeology & HydrologyFranklin Deep Waitemata Aquifer Groundwater Availability Study
Project Summary Deriving the groundwater abstraction availability for the Franklin Deep Waitemata Aquifer in accordance with the Auckland Unitary Plan. Services Provided Project Conclusion The successful determination of aquifer abstraction availabilities for four separate groundwater management areas.
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Geotechnical Engineering & Engineering GeologyOhinekaua Stream Bridge
Project Summary Earthtech has assisted with the bridge replacement by carrying out geotechnical design of the new Ohinekaua Stream Bridge. Ground conditions at the site were complex, including a thick layer of weak and compressible peat and clay, and deep liquefaction effects. Through specialist testing and analysis, and working closely with the project team, we […]
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Groundwater & Surface Water TakesGroundwater Take Assessment for Kiwifruit Orchard Irrigation
Project Summary The development of a >500,000m³/yr groundwater take for irrigation, frost protection and spray use for a large kiwifruit orchard. The water is supplied from two boreholes tapping the deep confined fractured ignimbrite Mamaku aquifer. Services Provided Project Conclusion This project secured groundwater abstraction rights, demonstrating that the proposed take aligns with sustainable allocation […]
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Groundwater & Surface Water TakesGroundwater and Surface Water Take Assessment for Dairy Farm Irrigation Supply
Project Summary The development of a dairy irrigation supply consisting of a groundwater take of 406,800m³/yr, from two production bores >100m deep which tap the Awhitu Peninsula Kaawa aquifer, and a run-of-stream take of 465,700m³/yr. Services Provided Project Conclusion This project secured groundwater and surface water abstraction rights, demonstrating that the proposed takes align with […]
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Geotechnical Engineering & Engineering Geology Infrastructure and Land DevelopmentWairere Drive-Cobham Drive Intersection Grade Separation
Project Summary Earthtech carried out detailed geotechnical investigations for the four-lane bridge, associated on- and off-ramps, and road alignments. This included the design of deep soil mixing ground improvement to address liquefaction effects, retaining walls, earthworks, stability assessment adjacent to live roads and nearby gully, and dewatering for buried services construction. The scope of work […]
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Construction Dewatering Geotechnical Engineering & Engineering Geology Hydrogeology & Hydrology Infrastructure and Land DevelopmentNgaakooroa Stream Bridge Dewatering
Project Summary Elevated artesian groundwater pressures coupled with overhead power lines, created challenging conditions for bridge pile construction. Working with the project team, Earthtech provided a dewatering bore design solution to depressurise the artesian groundwater levels. Timeframes were very tight, meaning that the dewatering design, consenting and dewatering bore construction stages significantly overlapped. The project […]
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Geotechnical Engineering & Engineering Geology Infrastructure and Land DevelopmentWhitianga Waterways, Marden Cove Waterways and Pauanui Waterways Canal Subdivision Developments
Project Summary Earthtech has been assisting these clients with canal subdivision developments since the 1990s. Across these projects, we have supported the developer through the design and construction of multiple subdivision stages, including associated retirement villages, commercial buildings, and road access bridges. Services Provided Project Conclusion These projects stand as a testament to the long-standing […]
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Construction Dewatering Geotechnical Engineering & Engineering Geology Hydrogeology & Hydrology Infrastructure and Land DevelopmentCollins Road Wastewater Facility Dewatering
Project Summary Earthtech became involved in the project when unexpected groundwater conditions and piping in the excavation floor were encountered during construction of 7.8m to 9.1m deep excavations and shafts for wastewater infrastructure construction. We carried out groundwater investigations and pump testing to define a dewatering solution that provided a dry, safe and stable excavation […]
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Geotechnical Engineering & Engineering Geology Infrastructure and Land DevelopmentSmales Road Commercial Development
Project Summary Earthtech carried out geotechnical investigations and design for four large commercial buildings. Ground conditions were challenging and variable, including compressible ground conditions with weak soils and undercuts through to hard volcanic soils and building across cut-fill lines. Warehouse floor areas ranged between 3,160m² and 6,570m², supporting floor live loads of between 40kPa and […]
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We work with central and local government, state-owned enterprises, developers, contractors, and private clients — supporting projects of varying scale and complexity with practical, well-considered engineering input.
Office(09) 238 3669
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