Review of Environmental Factors - Transport for NSW - NSW ...

4.2 Water Quality and HydrologyExisting SituationThe following wastewater types can be generated by construction activities:• water from spills, and from washing equipment and tools.• sewage from the site facilities.The Tasman Sea is located 1.4 kilometres east of the site. The suburban stormwater system issituated along the main roads (i.e. Dean Street) and some stormwater drains may be presentaround the construction footprint. Based on registered groundwater bores on the vicinity of thesite, the groundwater depth is estimated to be about five metres below the surface.Potential ImpactsWithout appropriate safeguards, contaminants may reach nearby drains and discharge intolocal waterways. These contaminants may have the potential to harm aquatic life and affect thequality of water downstream. However, the risk of such an occurrence is low, given the limitedconstruction activities proposed and the distance between the site and drains and creeks.No operational impacts are expected. The works will not affect the landform or the flow of waterin the area.Possible Control MeasuresDuring construction water quality impacts will be minimised through a range of controlmeasures. The water quality measures may include, but will not be limited to those outlinedbelow.• Ensure construction materials are not left in the vicinity of storm water drains.• Plant and equipment will be checked regularly for oil leaks.• Plant and equipment will not be refuelled on site.• Wash down areas will be off site.4.3 Air QualityExisting SituationWollongong City Council’s State of the Environment Report 2009-2010 reported that theregional air quality in Wollongong area was largely ‘good’. Local air quality is influenced bydomestic, industrial and traffic emissions.Potential ImpactsLocal and regional air quality can be affected during construction by construction vehicleemissions and odour. Poorly maintained vehicles can produce excess emissions.The works will require energy to power vehicles (e.g. construction, delivery and staff vehicles)and construction plant. The energy requirements will primarily be in the form of fuel (petrol andPage 30 of 64