Annex 11 - Code 11 - Marine Plants

  Performance outcomes                          Acceptable outcomes   Response
                                                                      saltmarsh and mangroves. Temporary impacts on low
                                                                      value and degraded marine plants growing on rock,
                                                                      such as macroalgae and turfing algae, will occur only
                                                                      at the Tewantin site. All other sites will be located
                                                                      over bare sediment (primarily well sorted sand)

                                                                      Minimum distances from marine plants are specified
                                                                      to ensure high value marine plants are protected (as
                                                                      outlined in Section 2.3, Table 2.2. of the Project
                                                                      Restoration Plan and in ICM drawing NROR-2021-
                                                                      00). These minimum distances have been shown in
                                                                      other oyster restoration projects to be suitable to
                                                                      adequately protect marine plants. Minimum distanced
                                                                      are based on the project’s recent (late 2020) mapping
                                                                      of all marine plants within the broader investigation
                                                                      area prior to detailed design.

                                                                      The restoration substrate type, structural design and
                                                                      placement are to ensure that minimum distances from
                                                                      higher value marine plants are maintained.


                                                                      (2)   Temporary impacts to macroalgae
                                                                      communities at the Tewantin site are expected

                                                                      A small stand of mangroves is shoreward of the
                                                                      proposed restoration footprint. Mangrove areal roots
                                                                      extend into the intertidal zone adjacent to the
                                                                      proposed restoration footprint. Mangrove roots are
                                                                      excluded from the restoration footprint at a minimum
                                                                      distance of 2m. Seagrass is found upstream and
                                                                      outside of the restoration footprint and is also
                                                                      excluded from the footprint at a minimum distance of
                                                                      10m from the footprint.

                                                                      According to project consultants, ESP, macroalgae
                                                                      growing on rocks, dominated by Padina sp. is sparse
                                                                      (less than 15% of the surface area), with a footprint of
                                                                      less than 479m2. The macroalgal assemblages are in
                                                                      relatively poor condition due to high sediment loads

State Development Assessment Provisions – version 2.6
State code 11: Removal, destruction or damage of marine plants                                        Page 2 of 24