OPW20.0191 NC IR response

Engineering Response to Item 1
PO14 of the Water Quality and Drainage Code and demonstration how the proposed
works are compliant with this portion of the code is shown in Table 1 below.


Performance Acceptable Outcomes                                              Demonstrated
Outcomes                                                                     Compliance with PO14
Construction and                                                             AO14.1
establishment of                                                             The Erosion and Sediment Control
stormwater       AO14.1                                                      Plans have been updated. The
management       An erosion and sediment control plan prepared in            updated plan has been generally
systems          accordance with the International Erosion Control           designed in accordance with the
PO14             Association Best Practice Books demonstrates that           International Erosion Control
Construction     the capture and release of stormwater achieves the          Association and in accordance
methods provide design objectives listed in Table A: Construction            with the SPP Appendix 2. A copy
for appropriate  phase – stormwater management design objectives             of the updated plans are attached
                 of the State Planning Policy (Appendix 2).                  to this response.
controls to avoid
entry and            Editor’s note— PSP6 Engineering Design             AO14.2
transport of litter, Standards - Roads, drainage and earthworks         Construction works had
sediment, and        provides guidance on requirements for preparing an commenced prior to the
associated           Erosion Management Plan.                           engagement of 360 Civil
prescribed water                                                        Consulting. Once 360 Civil
contaminants into AO14.2                                                Consulting were engaged, works
receiving waters.    Construction works are designed and managed   to   relating to stabilising the existing
                    restrict the extent of clearing and soil exposure to     exposed portions of the site were
                    the minimum necessary for access, and safe               prioritised.
Editor's
note— Water         construction at any one time.
                                                                        AO14.3 – N/A
contaminants are
                    AO14.3
prescribed in the
                    For buildings:                                      AO14.4 – Sediment Control is
Environmental
Protection Act                 1. upstream runoff is diverted around    proposed via a Type D basin. No
                                   the construction site;               flocculant is proposed.
1994.
                               2. sediment barriers are provided
                                   downslope of disturbed areas to      AO14.5 – N/A
                                   prevent sediment washing into
                                   gutters, drains
                                   and waterways , wetlands or drainage
                                   lines either on or off the site; and
                               3. temporary or permanent downpipes
                                   are connected to the stormwater
                                   system before laying the roof; or
                               4. localised erosion is avoided by
                                   directing flow from downpipes over
                                   non-erosive areas.

                    AO14.4
                    Chemical flocculants used as part of an erosion and
                    sediment control plan do not harm the
                    environmental values within receiving waters.

                    AO14.5
                    Appropriately sized litter containment areas, with
                    provision for sorting recyclables are provided for the
                    type of litter expected to be generated onsite.


Table 1 – PO14 of the Water Quality and Drainage Code and how the proposed
development complies with this portion of the code.




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