Atteris performed the site selection and preliminary design of the shore crossing for operator Woodside Energy Limited, and was further involved in the role of coordinator and supervisor of the detail design and construction phases. The development of the Otway Gas Project required the installation of a 20-inch gas pipeline and a 4-inch glycol service line across the shoreline within the Port Campbell National Park along the Great Ocean Road.
An account is given of the landfall site selection process, the collection of required site data, the identification of geo-hazards, the development of a unique construction method based on a combination of retractable micro-tunnelling and horizontal directional drilling, and an outline of the construction challenges. The design and construction work performed demonstrates that trenchless technology can successfully be applied for the installation of pipelines across shorelines whilst not damaging the local environment.
