Hurstville REF - Transport for NSW - NSW Government

Potential ImpactsIn addition to sediment rich runoff, the following wastewater types can be generated byconstruction activities:Liquid waste from non-destructive excavation;Water from spills;Sewage from the site facilities; andWater collected in trenches and the pit.Without appropriate safeguards, contaminants such as liquid waste generated during nondestructiveexcavation may reach nearby drains and discharge into local waterways. Thesecontaminants may have the potential to harm aquatic life and affect the quality of waterdownstream. However, the risk of such occurrence would be minimised through implementationof measures provided in the control measures listed below.Rain or groundwater may enter the excavations. If inappropriately managed, sediment-ladenwater could be discharged into local water bodies and/or the nearby stormwater system.No operational impacts are expected. The works will not affect the landform or the flow of waterin the area.Control MeasuresDuring construction water quality impacts will be minimised through a range of control measuresin addition to the erosion and sedimentation controls included in Section 4.1. The water qualitymeasures will include, but will not be limited to those outlined below.A Water Management Plan will be prepared before construction begins to determine themost appropriate method for water disposal should groundwater be encountered during pileboring activities.A geological engineer will be present during the boring of the pile and work will ceaseimmediately if groundwater is encountered. The water will be tested according to industrystandards to determine the presence of contaminants or other materials. This will determinethe most appropriate method of water disposal. If water is encountered, special constructionmethodologies will be adopted to prevent a continuing flow of groundwater to the surface.Ensure construction materials are not left in the vicinity of stormwater drains.Trenches and excavations will be covered to prevent rainwater entering.Plant and equipment will be checked regularly for oil leaks.Plant and equipment will not be refuelled on site.Wash down areas will be located away from waterways and drainage lines.Page 34 of 75