Volume Two 23. Airport Zone 23.3.9.2. Fuel containing sulphur at levels greater than 0.05% by weight must not be burned. 23.3.9.3. The power output of the device must not exceed 400kW, this limit applies to the total heat output from a site. 23.3.9.4. If the power output of the device is between 30kW and 400kW – (a) the engine must not be operated for a total of greater than 5 hours in any 24-hour period; (b) if the engine is in a fixed location, the stack must comply with the requirements of Appendix 8 – Schedule 5. 23.3.9.5. Where more than one fuel type is used on the site, the combined heat output must not exceed the lowest MW or kW threshold of any of the fuel types used. 23.3.10. Discharge of contaminants to air from water blasting and from dry abrasive blasting, other than from the use of a moveable source. 23.3.10.1. There must be no discharge of water spray, dust or other contaminant beyond the boundary of the property. 23.3.10.2. Where the discharge occurs from public land there must be no discharge of water spray, dust or other contaminant beyond 50m from the discharge point or beyond the boundary of the public land, whichever is the lesser. 23.3.10.3. There must be no discharge of water spray, dust or other contaminant into the coastal marine area. 23.3.10.4. 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. 23.3.10.5. 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. 23.3.10.6. For dry abrasive blasting the free silica content of a representative sample of the blast material must be less than 5% by weight. 23.3.11. Discharge of contaminants to air from the application of coating materials (including paints and powders) through spray application undertaken within an enclosed booth. 23.3.11.1. Coatings that contain di-isocyanates must not be used. 23.3.11.2. The maximum rate of coating material sprayed at one booth must not exceed 10 litres per hour. 23.3.11.3. The spray booth must be fitted with an air extraction system vertically discharging all contaminants and exhaust air to an emission stack. 23.3.11.4. The emission stack must be a height of at least 2m above the ridgeline of the roof of any building, land or other substantial structure within a radius, from the stack, of 35m. 23.3.11.5. The discharge must be directed vertically into the air and must not be impeded by any obstruction above the stack that decreases the vertical efflux velocity, below that which would occur in the absence of such obstruction. 23 – 9