Challenges:

Involved in the construction of the Beachport CWMS were a range of challenges that needed to be overcome in order to construct the varies components. Some were more significant than others but all needed to be overcome in order to complete the project. They included:

• Extensive ground water inundation during trenching for the varies pipelines & SPS shaft excavation

• Deep trench excavation up to 5m

• Hard rock encountered in different areas of the town

The ground water was the most significant challenge to overcome because it was encountered in over 60% of the gravity drain catchment area and at varying depths within the trench profile. A range of dewatering techniques from sump pumping with flex-drive pumps right up too multi stage dewatering systems requiring the use of 2x 150mm Sykes Vacuum Pumps were used across the project. Deep trench excavation for the gravity drain alignment down the main street of Beachport was avoided by Baker Civil proposing alternative options via different alignments to reduce the depth of excavation. Hard rock was excavated with our capability to handle rock.