The task was to map all the subsurface utilities in Bakers Hill, WA – not a
small undertaking! Main Roads WA needed this accurate information on the
subsurface utilities in Bakers Hill WA to complete their design of a new road,
in various formats, including from 12d Model.
Civil designers need their designs to work in the real world, and existing
underground infrastructure can cause major issues. The existing records for the
asset owners can be accessed through Dial Before You Dig (DBYD), but the spatial
accuracy of these records is often not precise enough – in general there is a
lot more underground than these records indicate, and the designers need data
they can trust…enter subsurface utility locaters.
Dale Shearsmith’s team proceeded to locate all known Quality D utilities via
Ground Penetrating Radar (GPR) and electromagnetic locaters. They then potholed
for Quality Level A data.
SUI AS5488 (Classification of Subsurface Utility Information)
This Standard was prepared by Standards Australia Committee IT-036. The
objective of this Standard is to provide utility owners, operators and locators
with a framework for the consistent classification of information concerning
This Standard is intended to be used by those agencies and organisations that
own, operate or regulate subsurface utility infrastructure and those that
collect, depict and map such infrastructure. This Standard is also intended to
be used by developers and consent authorities involved in the planning, approval
and installation of subsurface utility infrastructure.
To provide consistent data across projects, Subtera uses the following
- Take Quality Level C & D data and validate it to Quality Level A & B
- Collate “As Constructed” drawings of the subsurface infrastructure
- Ensure these utilities are located and surveyed
- Search for “Unknown” subsurface utilities at the final stage
- Every “Known” and “Unknown” utility will be accounted for in our field
report providing an audit trail
- We adhere to all asset owners regulations when accessing manholes and
infrastructure and hold accreditions for ATCO High Pressure Gas, Telstra
Fibre and the Watercorp
- All works are carried out with a focus on Zero Harm to our employees and
the public as outlined in our HSSE documentation
By delivering data to the AS5488 standard, the team was
able to qualify the data with attributes, which flow through the design process,
allowing Main Roads to accurately budget for asset relocations as well as trust
the clash detections listed and integrate some of the utilities that were
already there, allowing for more saving of money.
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