Bulk Earthworks Case Studies

Deep Stream Hydro Scheme  
Investigation, design, documentation and supervision of a new hydro scheme in Otago for TrustPower Ltd. Civil Construction included approximately 300,000 cubic metres of earthworks to form a 25m high earth dam, 9m high saddle dam and 8km of canals. Preparation of an Earthwork and Sediment Control Plan for bulk earthworks activities and associated construction works.  
Stockyard Falls Bulk Retail, Warkworth
Project management, detailed civil design, consenting and construction supervision for a bulk retail development. Initial work included preparation of engineering documentation to support a Plan Change application to enable construction of the 8ha bulk retail centre. Due to the sensitivity of the receiving environment the development required a high degree of engineering input. Significant earthworks (90,000 cubic metres) were required to prepare the site for development which included pre-loading to address settlement issues and raising building platforms within flood plains. Preparation of an Earthwork and Sediment Control Plan for bulk earthworks activities and associated construction works.
Anzac Cliff, Manawatu
Feasibility investigation to realign the Manawatu River and adjacent cliff to allow a revision to the present building line on residential land. The cut volume for the initial concept is 380,000 cubic metres with a fill volume of 350,000 cubic metres excluding river diversion and earthworks below river level. Silt control will be a significant issue, especially considering the proximity to the river and the associated risks of flooding during construction. Careful staging of earthworks will be required, in conjunction with surface water diversion and silt control facilities.
Mahinerangi and Kaiwera Wind Farms
Geotechnical investigations and civil engineering design of two proposed wind farms to support resource consent applications. The wind farms consist of 90 turbines of 3MW each plus 25km of connecting roads, and 200 turbines of 3MW each plus 37km of connecting roads respectively. Preliminary designs assessed earthwork activities, erosion and sediment control measures and stormwater management. Assessments also required the optimisation of turbine and road locations, stability assessment, groundwater depressurisation, on-site aggregate assessment for pavement construction and concrete batching. The quantity of earthworks estimated to form the wind farms were 2.62 million cubic metres and 2.53 million cubic metres respectively.  
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