Volume Two 12. Industrial 1 and 2 Zones (f) 400kW for pellet fuel when burnt in a standard boiler converted for pellet fuel use; (g) 10MW for diesel; (h) 2MW for kerosene. 12.3.9.2. The limits in Standard 12.3.9.1 apply to the total heat output from the site. 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. 12.3.9.3. The fuel must be burned using fuel burning equipment, and the discharge must be from a chimney or exhaust structure designed so that the emission is effectively dispersed upwards. 12.3.9.4. The opacity of the discharge when measured at the point of entry to the atmosphere must not exceed 20%, except that a discharge in excess of this is allowed for a period of not more than 2 minutes continuously, or for an aggregate of 4 minutes, in any 60 minute period. 12.3.9.5. The fuel burning equipment must be maintained in accordance with the manufacturer’s specifications at least once every year by a person competent in the maintenance of that equipment. A log recording all maintenance must be made available to the Council on request. 12.3.9.6. The stack must comply with requirements in Appendix 8 – Schedule 5. 12.3.9.7. Coal must not be burned as a fuel if there are buildings higher than 6m within a 25m radius of the discharge. Fuels other than coal must not be burned if there are buildings higher than 5m within a 25m radius of the discharge. 12.3.9.8. The sulphur content of any coal burnt must be less than 2%. 12.3.10. Discharge of contaminants to air from water blasting and from dry abrasive blasting, other than from the use of a moveable source. 12.3.10.1. There must be no discharge of water spray, dust or other contaminant beyond the boundary of the property. 12.3.10.2. 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. 12.3.10.3. There must be no discharge of water spray, dust or other contaminant into the coastal marine area. 12.3.10.4. 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. 12.3.10.5. 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. 12.3.10.6. For dry abrasive blasting the free silica content of a representative sample of the blast material must be less than 5% by weight. 12 – 9