2021-12-01 Special Meeting Agenda

SPECIAL MEETING AGENDA                                                              1 DECEMBER 2021


2013 and commissioned in 2016 is now the operational active waste cell at the landfill.
Since the construction of Cell 2.2 in 2013, there has been no major capital works targeted at the
continued operations of the site.
In 2019, Cell 2.2 was observed to be approaching its interim capacity limits and planning commenced
for construction of the new cell to facilitate continued operations of the landfill before Cell 2.2 reaches
its interim capacity limits in June 2022.
Historically, landfill cell expansions consist of the construction of a new cell of a generic/defined size,
in unoccupied areas beside the existing land formation. This has been Council’s method of planning
since the site’s establishment. However, with consideration of the landfill’s limited available space
and need for a data driven approach, waste specialist consultant ATC Williams was engaged to
assist in the development of a Landfill Master Plan for the site. The master plan provided a holistic
layout of the site to optimise cell footprints and future staging.
An extract of the master plan for the site is provided in Attachment 2: “Noosaville Landfill Project
Overlap and Sequencing”, for information.
The primary findings from the master plan were the opportunity for expansion of Cell 1.1 southward
to optimise the landfill airspace capacity (life span) in place of constructing new waste cells (Cell 3.1,
3.2 or 3.3) to the east, as originally planned.
Both options, expansion of Cell 1.1 or construction of Cell 3.1, provided a forecasted additional 2-3
years of operational life. However, construction of the Cell 1.1 expansion allows for better fill
continuity with the landfill’s main cells (Cell 1.1, 2.1 and 2.2) for a further 10 - 15 years of operations
up to the next interim height (RL40m) before further cell works is required.
2.    Project Scope
The project scope of the Noosaville Landfill – Cell Expansion and Cell 1.1 Capping works originated
as two (2) Capital projects programmed for delivery over multiple financial years. The scope of works
generally included the following:
a)    Cell 1.1 Expansion
      •     Design and construction of Cell 1.1 - expansion southward to align with the southern
            limits of Cell 2.2 for immediate use.

b)    Cell 1.1 Capping
      •     Design and construction of Cell 1.1 - final capping of decommissioned batter extents
            using clay and earthen material available on site.
The project scope and estimates were generally based upon approximated areas and typical design
elements. This high-level scoping and cost forecasting was later deemed unsuitable for the site’s
material suitability, design extents and complexity.
The detailed design identified that work in addition to the original project scope was required to
construct a functional and compliant waste cell for the site. Additional geological testing and
interrogation of the site’s available earthen material identified a lack of suitable clay on site, meaning
large quantities of clay would need to be imported during construction which is a risk as clay is widely
scarce and expensive.
This better understanding of the site’s geological conditions and functional/operational requirements
resulted in a rescoping of the original project scope for compliance. A summary of the required scope
additions and design layout is provided below:

a)    Cell 1.1 & 2.2 Expansion (FY20/21)
      •     Design and construction of Cell 1.1 expansion, [Red]
      •     Design and construction of Cell 2.2 expansion, [Blue] (new)
      •     Design and construction of cell perimeter haul road, [Orange] (increase)
      •     Design and construction of new SW5 clean water and dirty water drains, [Purple] (new)
      •     Design and construction of new SW5 HES Basin, [Purple] (new)

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