Glenbrook Sation REF (pdf 3.15MB) - Transport for NSW - NSW ...

Review of Environmental FactorsGlenbrook commuter car park and interchange upgrade• Erosion and sediment control measures would be left in place until the works arecomplete and areas are stabilised.• Works would be avoided during rainfall (or whilst the ground remains sodden) to minimisevehicle disturbance to the topsoil.• Excavated soils for disposal/reuse would be tested during construction to determineappropriate waste classification. Further toxicity characteristics leaching procedure testingwould also be undertaken in the field while construction is being undertaken to fullyclassify the waste if it is not able to be classified as virgin excavated natural material(VENM).6.10 HYDROLOGY AND WATER QUALITY6.10.1 Existing environmentThere is an existing culvert that runs from north to south under Burfitt Parade. This culvert carriesstormwater from an unnamed creek line running through the residential area north of the proposed site.The creek appears to be dry except for during wet weather. Stormwater would ultimately drain toGlenbrook Creek located approximately 680 metres south which drains to the Nepean River 2.5kilometres to the east.Glenbrook Creek and its tributaries are part of the Erskine/Sassafras Creek subcatchment of theHawkesbury‐Nepean Catchment. The majority of creeks within the subcatchment are considered to be innear intact or good condition (HNCMA 2013).6.10.2 Potential impactsThere is a potential for soil to be washed into stormwater channels, during works that expose soilsurfaces such as excavation of the proposed commuter car park, resulting in a reduction in water qualityand increased turbidity.Leaks from vehicles and spills of chemicals during construction have the potential to enter stormwaterchannels and reduce water quality.There is a potential to damage existing stormwater infrastructure, through scouring of outlets etc if thereis not sufficient capacity for additional stormwater from the proposed commuter car park.Oil and other leaks from vehicles during the operation of the proposed commuter car park have thepotential to cause a small but long‐term reduction in water quality if allowed to leave the car parkuntreated.6.10.3 Mitigation measures• Adequate water quality and hazardous material procedures (including spill managementprocedures, use of spill kits and procedures for refuelling and maintaining constructionvehicles/equipment) would be implanted during the construction of the project.• Construction staff would carry out visual inspections of stormwater to identify anycontamination (turbidity, hydrocarbon spills).Ref No: 2260812 66