Topography and Surface Drainage. Describe the regional and site specific topography and surface drainage patterns that exist at the facility. Include a map that shows the topography and surface drainage depicting all waterways, wetlands, floodplains, water features, drainage patterns and surface water containment areas.
Topography and Surface Drainage. (As per environmental scoping report) The topography is relatively steep with about 7% fall from SW to NE of the substation and draining towards the main gravel road, substation yard and covered with vegetation in the form of shrubs and grass. Regional Geology (As per environmental scoping report see DESD) No Special geological features to note at the substation site. Substation Site Geology The Ulundi substation site is underlain by loam soil with soft to medium yellowish cohesive soils and trace of shale like rock at approximately 1.50m below the ground. The average depth concluded by the visual geotechnical investigation such as dongas, cuts and excavation in and around the substation undertaken by Eskom’s Civil Engineering Department, revealed just under 1.5m depth contains such material and below 1.5m is shale like rock. The soils at the substation site have been classified as Type 3 based on the above and as per Eskom’s Classification criteria, with a bearing pressure range of under 75kPa. It should be noted that the oil dam will need to be excavated more than the 2m in depth and this will require breaking the shale rock at least a minimum of about 1.5m.
Topography and Surface Drainage. (As per environmental scoping report) The topography is relatively steep with about 7% fall from SW to NE of the substation and draining towards the main gravel road, substation yard and covered with vegetation in the form of shrubs and grass. Regional Geology (As per environmental scoping report see DESD) No Special geological features to note at the substation site. Substation Site Geology The Ulundi substation site is underlain by loam soil with soft to medium yellowish cohesive soils and trace of shale like rock at approximately 1.50m below the ground. The average depth concluded by the visual geotechnical investigation such as dongas, cuts and excavation in and around the substation undertaken by Eskom’s Civil Engineering Department, revealed just under
