Minor Change Existing Approval MCU23 0094 03, OPW23 0113 03 & RAL23 0014 03 (As Published) · RAL23/0014.03

                              flocculant having regard to the downstream receiving environment and water quality;
                              and
                      f.      include the results of all soil investigations undertaken for the site and on which the
                              E&SCP is based
               64.    Prescribed Water Contaminants (as defined in the Environmental Protection Act 1994) must
                      not be released from the site or to waters within the site, or be likely to be released should
                      rainfall occur, unless all reasonable and practicable measures are taken to prevent or
                      minimise the release and concentration of contamination. These measures must be
                      designed, implemented and maintained in accordance with “Best Practice Erosion and
                      Sediment Control” published by the International Erosion Control Association (Australasian
                      Chapter) (IECA, 2008), to the extent that such measures and practices are also consistent
                      with the following:
                      a.      Minimise Erosion
                              i.       Restrict the extent of clearing to that necessary for access to and safe
                                       construction of the approved works;
                              ii.      Protect vegetation in all other areas of the site;
                              iii.     Minimise the duration of soil exposure by undertaking land clearing and
                                       stabilisation according to the rainfall erosion hazard as specified in IECA (2008)
                                       Tables 4.4.2 and 4.4.7
                              iv.      Prior to either the approval of the plan of survey for the development or
                                       commencement of use, all site surfaces are to be effectively stabilised using
                                       methods that will continue to achieve effective stabilisation in the medium to long
                                       term. 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.
                      b.      Manage concentrated stormwater flows
                              i.       Implement drainage and erosion control measures (including contingency
                                       measures), prior to rainfall, which prevent or minimise rill erosion and gully
                                       erosion.
                              ii.      Ensure clean stormwater is diverted/managed around or through the site without
                                       increasing the concentration of total suspended solids or other contaminants in
                                       the flow and without causing erosion (on-site or off-site). If it is not feasible to
                                       divert all areas discharging clean stormwater around or through the site, the clean
                                       stormwater runoff is managed in the same manner as contaminated stormwater
                                       runoff and ensures that sediment basins are sized to accommodate the additional
                                       volume of runoff.
                              iii.     Prior to each rainfall event ensure concentrated stormwater flow paths are
                                       provided with capacity in accordance with IECA (2008) Table 4.3.1 and do not
                                       cause water contamination, rill or gully erosion, sedimentation or damage to
                                       structures or property
                      c.      Minimise sediment released from the site
                              i.       All site sub-catchments greater than 2,500m2 in area, are to be provided with
                                       sediment controls which are designed, implemented and maintained to a
                                       standard which would achieve at least 80% of the average annual runoff volume
                                       of the contributing catchment treated (i.e. 80% hydrological effectiveness) to
                                       50mg/L Total Suspended Solids (TSS) or less, and pH in the range 6.5–8.5.
                                       Where this is proposed to be achieved through the use of sediment basins, the
                                       following applies:




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Document Set ID: 24843802
Version: 3, Version Date: 11/06/2026