Stormwater Management Plan - Rev 1

                                                                                       20169 - SBSMP/1
                                                                                                  Page 12




6 STORMWATER QUALITY
The following section of the report will outline the potential contaminants and proposed solutions
to be incorporated during the construction and operational phases of the proposed development.


6.1 State Planning Policy Assessment
The purpose of this sub section is to determine if State Planning Policy (SPP 2017) stormwater
quality requirements, as set out by the Department of Environment and Resource Management, will
be triggered for this development. Refer to Table 6.1 for the State Planning Policy Checklist for
stormwater quality.
                               Table 6.1 – State Planning Policy Checklist

                                    Material Change of Use (MCU)                           Y/N?

            MCU for an urban purpose that involves premises ≥ 2500m 2                       Y
            AND
            Will result in 6 or more dwellings
                                                                                            Y
            OR
            Will result in impervious area greater than 25% of the net developable area.
                                                                                            Y

The development has been assessed against the latest State Planning Policy 2017 (SPP 2017). The
proposed development will entail the material change of use for urban purposes, which will involve
a land area greater than 2,500m2. Consequently, State Planning Policy 2017 (SPP 2017) is triggered.

Hence, tertiary stormwater quality treatment is warranted for this development in accordance
with the State Planning Policy 2017 (SPP 2017).


6.2 Construction Phase
Sediment generated during the construction phase shall be dealt with in accordance with an
Erosion and Sediment Control Plan and kept on site during the construction phase.

Erosion and Sediment Control (ESC) Measures such as silt fences, diversion drains, drainage
structure protection and dust control (clearing) will be implemented. Silt fences are to be erected
along the boundary of the site and around the construction area. These fences are to be cleaned
by the contractor when the capacity is reduced by 25%. Where possible, disturbance to the existing
surface is to be limited to the immediate work area. The existing ground cover is not to be stripped
until the contractor is ready for earthworks to begin.

Stockpiles and construction materials are not permitted to be stored within the road reserve and
should be contained using silt fences. Diversion drains are to be provided at upstream catchments
to reduce flows to earthworks areas. In any areas where flows could enter adjacent properties
temporary stabilisation is to be provided.

All ESC measures are to be provided as soon as earthworks have commenced and staged to suit
construction. The contractor is responsible for this action. A temporary construction exit is to be
located at each entry point to the site and will be determined based on the stage of works being
completed. The contractor is to ensure all dust tracked onto surrounding roads is immediately swept
to remove silt/dust.

All new stormwater pits are to be protected from sediment infiltration by wrapping new pits and
grates in geofabric or covering appropriately with timber board. Silt fences are to remain in place
during the maintenance period until the site is established (80% ground cover).

Site Based Stormwater Management Plan
Proposed Townhouse Development at 101-105 Eumundi Noosa Road, Noosaville