Information Request MCU23 0007 [As Published]

                 Issue – Stormwater Discharge
                 There is insufficient information for Council to assess the proposed bioretention swale and
                 associated stormwater infrastructure. Council is concerned that:
                      •    the proposed stormwater line ‘D’ will bypass the bioretention swale and connect
                           directly to the proposed Surcharge Pit 2/A;
                      •    the proposed SAG Field Inlet 1/A will create a pedestrian hazard. It is Council’s
                           preference that the proposed structure is constructed with a covered lid to avoid the
                           creation of trip hazards; and
                      •    the proposed 2/A – 1/A and 1/A – EX/A stormwater lines are likely to impact the existing
                           services in the road reserve along Myall Street.
                 Information Required
                 6.       Provide an amended Stormwater Management Plan that demonstrates how stormwater
                          collected on-site will be controlled, collected, and released without causing scour
                          damage to neighbouring properties or creating trip hazards for pedestrians. The
                          additional detail must be prepared by a suitably qualified person (RPEQ – Registered
                          Professional Engineer of Queensland) and include, but not be limited to:
                          a. provide comment on the water quality of the stormwater collected in proposed
                             stormwater line ‘D’ that bypasses the bioretention swale;
                          b. demonstrate the lid type of proposed stormwater structure 1/A and how the structure
                             will be constructed to avoid trip hazards in the road reserve; and
                          c. demonstrate that the existing services along the Myall Street frontage will not be
                             impacted by proposed stormwater lines 2/A – 1/A and 1/A – EX/A (including vertical
                             clearances).


                 Issue – Stormwater Quality
                 The MUSIC model uses nutrient removal rates for a proprietary device which has not been
                 independently verified through SQIDEP.
                 Survey of the downstream existing pit in Myall St should be provided in order to demonstrate
                 that the bioretention sub-soil drains can freely discharge.
                 Information Required
                 7.       Provide updated plans, SWMP and MUSIC model which only applies nutrient removal
                          rates for proprietary products if they have been verified through SQIDEP
                 8.       Provide survey of the downstream existing pit in Myall St in order to demonstrate that
                          the bioretention sub-soil drains can freely discharge.


                 Issue – Sustainable Building Design Code
                 PO2 of the Sustainable Building Design Code requires rainwater collection and reuse for non-
                 potable uses. This does not appear to have been addressed.
                 Information Required
                 9.       Provide updated plans and a SWMP which incorporates rainwater collection and reuse
                          at the site, sufficient to supply external non-potable fixtures such as communal
                          landscape irrigation and bin washdown.



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Document Set ID: 22307810
Version: 2, Version Date: 17/02/2023