22. Lake Grassmere Salt Works Zone Volume Two 22.3.10. Discharge of human effluent into or onto land through an on-site wastewater management system. 22.3.10.1. The human effluent must be treated via an on-site wastewater management system must be maintained in an efficient operating condition at all times. 22.3.10.2. There must be no increase in the rate of discharge due to an increased occupancy of the building(s). 22.3.10.3. There must be: (a) no ponding of effluent; (b) no run-off or infiltration of effluent beyond the property boundary or into a river, lake, groundwater or coastal water. 22.3.10.4. The discharge rate must not exceed 2000 litres per day, averaged over any 7 day period. 22.3.10.5. Effluent must be able to: (a) infiltrate through at least 600mm of unsaturated soil following primary treatment; or (b) infiltrate through at least 300mm of unsaturated soil following secondary treatment. 22.3.11. Discharge of contaminants to air arising from burning in the open. 22.3.11.1. Only material generated on the same property or a property under the same ownership can be burned. 22.3.12. Discharge of contaminants to air from the combustion of fuels (i.e. external combustion). 22.3.12.1. The discharge must not contain more than the following maximum heat output limits: (a) 10MW for natural or liquefied petroleum gas; (b) 40kW for untreated wood; (c) 200kW 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) 2 MW for kerosene. 22.3.12.2. The limits in 22.3.12.1 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. 22.3.12.3. 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. 22.3.12.4. 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 22 – 8