24647 Seaview Tce Enviro Mgmt Plan

Noosa Council documents




                                                                                                        OPW16/0021


                              must be installed. Priority must be given in the design to avoid the development of
                              channel, gully or rill erosion. All areas that will not require earthworks in the
                              imminent cut to fill operation must be stabilised to prevent entrainment of
                              sediments into receiving waters.
                      30.     Cut to fill earthworks must not commence until after the Supervising RPEQ has
                              certified that all installed erosion and sediment controls required by this approval
                              are sized in accordance with conditions of the approval and the written acceptance
                              of the certification is provided to the supervising RPEQ by Council officers.
                      31.     Offsite run-off must be diverted around exposed soils on the site without entraining
                              additional sediments. Discharge from measures to divert the offsite water must not
                              cause run-off impacts to other properties. Measures installed to divert the
                              upstream water must be designed and certified by the supervising RPEQ and
                              installed prior to commencement of bulk earthworks.
                      32.     Any temporary drainage works to manage stormwater flows during the construction
                              phase of development must be designed by the supervising RPEQ to provide a
                              150mm freeboard and convey the following flow capacities without resulting in
                              visible scour within flow paths:
                                   a.    1 in 2 year event where disturbed area open for less than 12 months
                                   b.    1 in 5 year event where disturbed area open for 12-24 months
                                   c.    1 in 10-year ARI event where disturbed area open for 24 months
                                   d.    Minimum 1 in 1 year ARI Hydraulic capacity for temporary culvert crossings
                      33.     E&SC measures must be installed and maintained to ensure runoff from the site
                              does not create gully or rill erosion and/or that any waters discharged from the site
                              up to and including a 85%ile 5 day rain event (or 46mm rainfall event) contain
                              less than 50mg Total Suspended Solids per litre. All relevant measures detailed in
                              the International Erosion and Sediment Control Book 2008 or Sunshine Coast
                              Manual for Erosion and Sediment Control must be installed to reduce erosion
                              impacts and minimise the amount of sediment leaving the site.
                      34.     Peak 1-year ARI event discharge from the construction phase of development
                              must be equivalent to the pre-development peak 1-year ARI event discharge.
                              Measures included in calculations to achieve management of peak flows must be
                              incorporated into the development in a manner that is consistent with the Noosa
                              Plan, all conditions of the approval and does not interfere with adjoining properties.
                      35.     Prior to the completion of the development, all site surfaces must be effectively
                              stabilised. For the purpose of this condition, an effectively stabilised surface is
                              defined as one that does not, or is not likely to result in visible evidence of soil loss
                              caused by sheet, rill or gully erosion or lead to sedimentation, or lead to water
                              contamination.
                      36.     The level spreader required to disperse low flows from the lower bioretention basin
                              must be located in a position where its installation causes the least necessary
                              disturbance to vegetation, whilst also achieving the objective of being located on
                              the flatter parts of the site, at elevations lower than any structural elements and at
                              elevations lower than near surface sandstone.
                      37.     A geotechnical engineer must be engaged prior to commencement of construction
                              to provide input to the:
                              a.        Final location of the level spreader from both bioretention basins, and other
                                        drainage outlets on the site.




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Document Set ID: 20097969
Version: 1, Version Date: 12/07/2016                                                                      Print Date: 12 July 2016, 2:14 PM