Prior to the HDD works commencing, UEA Trenchless needs to locate a treated effluent main that lies underneath the lake that could potentially impact on the proposed new alignment.
UEA Trenchless will install a 180mm conduit of 880 metres in length through sand and sandstone, representing one of the longest HDD boring projects undertaken by the Authority.
Part of the process involves a 350mm steel casing to be used over the first 80 to 100 metres. This is to prevent frac out whilst drilling through the soft formation into the harder sandstone. Frac out refers to the problem of pressure building from obstruction to a borehole, causing drilling fluid to escape to the surface.
For details about the Lake Conjola project, or for information about UEA Trenchless’ accreditation status, phone 02 9851 3000 or email us for a quick response. To find out more about Trenchless Technology, visit our Technical Centre.