22. Lake Grassmere Salt Works Zone Volume Two 22.3.1.2. The best practicable method must be adopted to minimise the generation of salt foam within the zone and to contain the spread of wind-borne salt foam beyond the boundaries of the zone. 22.3.2. Take and use of coastal water and the maintenance of existing seawater intake pipelines within the Lake Grassmere Salt Works Intake and Pipeline Extension Corridor shown in Appendix 21. 22.3.2.1. The taking of water must not exceed 1.4m³ per second and 121,000m³ per day. 22.3.2.2. The activity must not change natural water quality. 22.3.3. Discharge of stormwater from Lake Grassmere and surrounding catchments or diluted brine to the coastal marine area. 22.3.3.1. Outside a mixing zone of 200m radius measured from the point of discharge the following must be met: (a) the discharge must not inhibit the gathering of shellfish for human consumption; (b) the natural temperature of the receiving water must not be changed by more than 3C; o (c) the concentration of dissolved oxygen in the discharge must exceed 80% of the saturation concentration; (d) there must be no undesirable biological growths as a result of any discharge of a contaminant into the water. 22.3.4. Construction and use of a temporary stormwater flood outlet channel from Lake Grassmere to the coastal marine area, including any disturbance of the foreshore and seabed. 22.3.4.1. The temporary channel must only be constructed and used when a storm event is forecast. 22.3.4.2. The construction must be confined to the position and dimension within the Lake Grassmere Salt Works Intake and Pipeline Extension Corridor shown in Appendix 21. 22.3.4.3. The Council and the Department of Conservation must be advised as soon as a decision has been taken to construct the temporary flood stormwater outlet. 22.3.4.4. All excavated material must be stockpiled beside the temporary outlet cut for reinstatement following release of the stormwater. 22.3.4.5. The breach in the fore dunes and beach gravels must be reinstated to as close as practicable the condition of the land immediately prior to the work commencing. The reinstatement must be completed as soon as practicable following the passing of the storm event which created the need for the temporary outlet, but no later than 7 days after the event. 22.3.5. Living accommodation facility for staff. 22.3.5.1. The accommodation must be on-site and ancillary to the operations of the salt works. 22.3.5.2. The accommodation must only be provided to employees of the operator of the salt works. 22 – 4