Warrawee Substation - Review of Environmental Factors

Assessment of the environmental impacts and risks3. Assessment of the environmentalimpacts and risks3.1 Landforms, geology and soils3.1.1 Existing environmentLandformThe site is relatively steep and the rail lines are elevated above the site of theproposed substation. Land slopes down from the north (at the Hastings Road gate) tothe southern extent of the site.GeologyReference to the 1:100,000 scale Geological Series Sheet for Sydney (sheet 9130;Herbert, 1983) indicates that the study area is underlain by black to dark-grey shaleand laminite of the Wianamatta Group.SoilsThe site is located on the Glenorie soil landscape as shown on the Soil Landscapes ofthe Sydney 1:100,000 Sheet (Chapman et al, 1983). This landscape is characterisedby shallow to moderately deep red podzolic soils on crests; moderately deep red andbrown podzolic soils on upper slopes; deep yellow podzolic soils on lower slopes andhumic gleys, yellow podzolic soils and gleyed podzolic soils along drainage lines.ContaminationA search of the OEH’s Contaminated Lands Register was undertaken on 29 February2012. No contamination notices have been issued on any sites within Warrawee.Acid sulphate soilsAcid sulphate soils mapping contained on the NSW Natural Resource Atlas indicatesthat acid sulphate soils are not present in the vicinity of the site.3.1.2 Impact assessmentConstructionLandformThe proposal would require excavation into the embankment at the southernBrentwood Avenue access gate to provide the required space for the new substation.This adjustment of topography is not considered to significantly alter regionaltopography. A series of retaining walls are proposed around the substation to stabilisethe embankment.Warrawee Substation Project/Review of Environmental FactorsPage 18 of 64