22. Lake Grassmere Salt Works Zone Volume Two 22.3.15. Discharge of contaminants to air from the application of coating materials (including paints and powders) through spray application undertaken within an enclosed booth. 22.3.15.1. The coating material must not that contain any di-isocyanates. 22.3.15.2. The total amount of coating material sprayed on the property must not exceed 10 litres per hour. 22.3.15.3. The spray booth must be fitted with an air extraction system which vertically discharges all contaminants and exhaust air through an emission stack. 22.3.15.4. 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. 22.3.15.5. The discharge must be directed vertically into the air and must not be impeded by any obstruction above the stack which decreases the vertical efflux velocity, below that which would occur in the absence of such obstruction. 22.3.15.6. The discharge must be through a filtration system that removes at least 95% of particulate matter from the discharge. 22.3.16. Discharge of contaminants to air from water blasting and from dry abrasive blasting, other than from the use of a moveable source. 22.3.16.1. There must be no discharge of water spray, dust or other contaminant beyond the boundary of the property. 22.3.16.2. 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. 22.3.16.3. There must be no discharge of water spray, dust or other contaminant into the coastal marine area. 22.3.16.4. 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. 22.3.16.5. 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. 22.3.16.6. For dry abrasive blasting the free silica content of a representative sample of the blast material must be less than 5% by weight. 22.3.17. Discharge of heat and water vapour from cooling towers. 22.3.17.1. No more than 5MW of heat per hour must be discharged. 22.4. Controlled Activities Application must be made for a Controlled Activity for the following: 22 – 10