Annex 7 - Engineering Specifications

   2.2.1.         Shells to be sourced from Mooloolaba Fish Market and local seafood restaurants.
                  Shells to be cured (by desiccation) in accordance with Queensland End of Waste Code
                  – Oyster shells (ENEW07278317) as per the Waste Reduction and Recycling Act 2011.
   2.2.2          Shells to be whole not fragments.
   2.2.2.         Shells may be washed in freshwater prior to deployment as composite substrate or as
                  cultch (unseeded or seeded with oyster spat).


   2.3.           Seeded Oyster Cultch
   2.3.1.         Cured oyster shell to be seeded with local oyster spat to enhance oyster growth and
                  recruitment locally.
   2.3.2.         Live oyster brood stock to be grown in oyster bags within the Noosa River as part of
                  oyster gardening project (with permit).


3. OYSTER REEF SUBSTRATE

 3.1. A rock only substrate or a composite substrate of rock (as specified) mixed with cured oyster
          shell may be used as a restoration substrate.
 3.2      The composite substrate to be up to 10% shell to ensure substrate stability is maintained.
 3.3      Oyster shell volume in composite may be increased to 20% shell subject to certifying
       engineer's approval. A higher component of shell may be considered subject to constructability
       and monitoring outcomes.
 3.4. Shell to be evenly mixed through the rock, when used as a composite, to achieve good
          interlocking and not placed in alternating layers. Mixing to occur in small volumes on the
          barge immediately prior to placement to avoid shell damage due to rehandling.


4. CONSTRUCTION:

 4.1. Reef patches expected to be constructed using an excavator mounted on a shallow-draft
          barge. Excavator to be fitted with GPS position control (or have equivalent system in place to
          enable accurate placement).
 4.2. Substrate Placement
   4.2.1.         Rock shall be placed to be well interlocked and stable.
   4.2.2.         Rock shall be placed to provide an irregular, organic finish (within nominated
                  tolerances). This will assist in enhancing the stability of the seeded oyster cultch.
   4.2.3.         Rock placement to be clear of any existing vegetation and minimum required
                  distances (NROR-2021-00 Note 5.2).