ADG significantly reduced construction time and costs of in-ground works associated with the construction of a new facility, to allow the consolidation of Toowoomba Regional Council’s essential infrastructure activities into a modern, purpose-built facility.

$70

M CONSTRUCTION VALUE

30

HA GREENFIELD DEVELOPMENT

3

MONTHS CONSTRUCTED TIME SAVED

$2

M CONSTRUCTION COSTS SAVED

project details

Location

Toowoomba, Queensland

Client

McNab Developments

Project timeline

2019 – 2020

lead contact
Andrew Wilson

Team Lead – Toowoomba

Key Expertise
CHALLENGE

The Toowoomba Regional Council Depot project comprised a 30-hectare greenfield development in Charlton, designed to consolidate Council’s essential infrastructure activities into a modern, purpose-built facility, providing a seamless transition between operations and site work for 500 Council staff.

The project team was required to consider a number of key elements to ensure the economic viability of the project, including challenges associated with the presence of shallow, hard rock across the expansive site making excavation and trenching works difficult and expensive, in particular for the in-ground drain system design.

WHAT WE DID

ADG was engaged by McNab Developments to undertake civil engineering design work during the design and construct stage, with an aim to reduce the cost of the in-ground works. This comprised a full redesign of the civil engineering tender documentation.

Led by ADG Practice Manager Nick Ward, services provided included:

  • Rework of the substructure scheme to balance the cut and fill using a bespoke terraced cut-fill solution, and minimise the excavation of hard rock
  • Adjustments to bulk earthworks to significantly reduce the height and length of retaining walls required across the site
  • Redesign of the drainage scheme which included:
  • Removal of 1,750 linear metres of underground drainage and 60 inspection pits
  • Redesign of warehouse drainage to above ground to reduce in-ground water
  • Rerouting of the sewer around the site to provide better accessibility during construction
  • Installation of a bioretention system for stormwater collection to provide an enhanced environmental outcome and reduce pollutants entering nearby waterways.
Results

ADG’s redesign of drainage works facilitated a more efficient work sequence, enabling improved flexibility in the program of works. Rerouting the drainage around structures together with a ‘siphonic’ solution resulted in a cleaner outcome for the site, reduced construction time by an estimated three months, and allowed for more practical future maintenance.

Sustainability outcomes were also realised with design considerations that integrated the natural characteristics of the site and surrounding environment with a focus on water and energy efficiency.

“ADG’s expertise significantly improved the program, costs and sequencing associated with the Toowoomba Regional Council Depot construction activities, allowing works to be delivered earlier than expected and under budget.”

- Nick Ward, ADG Regional Manager, SEQ
the Team
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