The geotechnical information supplied by the client was very accurate and enabled the drill muds to be managed effectively through the continually changing ground conditions. The ground conditions varied between high plasticity clay, sand, silts and gravels.
UEA utilised its 25 tonne Vermeer D50 x 100 machine to undertake the pilot bore. Once this was completed the information was entered into the bore planner software and a profile was created.
To assist in working to the tolerance a surveyor was engaged to peg out the route and verify the profile. Boring under the Coomera River equated to 75 per cent of the bore length UEA was contracted to install a 630 mm PN 20 PE Pipe under the Coomera River, which involved boring and installing 330 metres of the pipe through very soft silty sandy ground with occasional gravels. UEA was recently engaged by Abigroup and Gold Coast Water to undertake the Coomera River bore for the Pumps and Pipes recycled water project, Gold Coast, Queensland, based on the company’s proposed work method statement and track record of completing difficult bores.
