13. Port Zone Volume Two 13.3.24. Discharge of contaminants to air from the combustion of fuel (i.e. external combustion). 13.3.24.1. The discharge must not be more than the following maximum heat output limits: (a) 10MW for natural or liquefied petroleum gas; (b) 40kW for untreated wood; (c) 100kW for coal; (d) 40kW for light fuel oil; (e) 1.0MW for pellet fuel when burnt in a custom designed pellet boiler; (f) 400kW for pellet fuel when burnt in a standard boiler converted for pellet fuel use; (g) 10MW for diesel (external combustion); (h) 2MW for kerosene. 13.3.24.2. The limits in Standard 13.3.25.1 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. 13.3.24.3. 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. 13.3.24.4. 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. 13.3.24.5. 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. 13.3.24.6. The stack must comply with requirements in Appendix 8 – Schedule 5. 13.3.24.7. Coal must not be burned 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. 13.3.24.8. The sulphur content of any coal burnt must be less than 2%. 13.3.25. Discharge of contaminants to air from combustion within a stationary internal combustion engine (i.e. internal combustion). 13.3.25.1. The fuel must be gas, LPG, petrol, diesel, vegetable oils or alcohol. 13.3.25.2. Fuel containing sulphur at levels greater than 0.05% by weight must not be burned. 13.3.25.3. The power output of the device must not exceed 400kW, this limit applies to the total heat output from a site. 13.3.25.4. 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; 13 – 14