15. Marina Zone Volume Two 15.4.3.4. The surface to be blasted must not contain any hazardous substances, including lead, zinc, arsenic, chromium, copper, mercury, asbestos, tributyl tin, thorium-based compounds, and other heavy metals including anti foul paint containing these substances. 15.4.3.5. For dry abrasive blasting all items must be blasted within an abrasive blasting enclosure and the discharge must be via a filtered extraction system that removes at least 95% of particulate matter from the discharge. 15.4.3.6. For dry abrasive blasting the free silica content of a representative sample of the blast material must be less than 5% by weight. Matters over which the Council has reserved control: 15.4.3.7. The standard of emission. 15.4.3.8. Recovery of toxic materials from the blasting enclosure. 15.4.3.9. Methods for disposal of toxic materials. 15.4.3.10. Requirement for monitoring. 15.5. Restricted Discretionary Activities Application must be made for a Restricted Discretionary Activity for the following: [C] 15.5.1. Construction and use of a building or structure (including the extension of an existing building or structure) and associated occupancy of the coastal marine area. Standards and terms: 15.5.1.1. The building or structure (or extension thereof) must be necessary for the operational requirements of the marina. 15.5.1.2. The building or structure (or extension thereof) must not be located in that part of the Marina Zone in Waikawa Bay identified in Appendix 10. Matters over which the Council will exercise discretion: 15.5.1.3. Benefits likely to arise from use of the building or structure. 15.5.1.4. The design of the building or structure, including size and construction materials. 15.5.1.5. The visual appearance of the building or structure. 15.5.1.6. Effects on the surrounding hydrodynamic and geomorphic environment. 15.5.1.7. Environmental effects resulting from construction. 15.5.1.8. The location of the building or structure, including associated effects on public access to the coastal marine area. 15 – 12