FEIR for Boitshepi Landfill Site .pdf - Zitholele.co.za

August 2010 4988487.1.3 Drainage Features (Surface and Ground water)Methodology and Data SourcesSurface waterA desktop screening assessment using a GIS tool was undertaken on the surface waterenvironment. The surface water data was taken from the WR90 data supplied by the DWA.Ground waterA total of seven boreholes were located by Golder Associates Africa around the BoitshepiWaste Disposal Site. Data was recorded in each borehole, collar plinths condition, staticwater level, casing information and borehole depth. The measurements of field parameters(Electrical conductivity (EC), Temperature and pH), were carried out at each site with aportable calibrated pH meter (pH/Conductivity EC500).Regional DescriptionThe Boitshepi Waste Disposal Site is located in the Upper Vaal River Catchment (DWA)Catchment C22F (Figure 15).Surface waters comprise flowing rivers and lakes or dams, with many of the smallertributaries being seasonal in nature (i.e. dry in the winter). Such rivers include the Klip River,which flows south east of the site towards the Vaal River south of Vanderbijlpark and theSuikerbosrant, which flows east of the site into the Vaal River.The Vaal Dam is located on the Vaal River some 56km south of Johannesburg, close toVereeniging. The catchment area of the dam is approximately 38 500 km 2 . The catchmentarea has a MAP of approximately 700mm.The aquifers found in the region are diverse due to the varied and complex geology. Theaquifers can be grouped into four hydrogeological types (DWA), 1999A) namely:intergranular (alluvial – found in valley bottoms); fractured aquifers; karstic (dolomitic)aquifers; and intergranular and fractured aquifers (in the weathered zone). The quality ofwater in these resources is highly variable depending on the geology, ecological setting andinfluence of man.Site DescriptionSurface waterTo the south-east of the Boitshepi Waste Disposal Site, there is a large wetland and dam,fed by the local stream.Ground waterThe underlying lithology is not uniform across the site. The northern area is underlain byoverburden and sandstone, whereas the southern area is underlain by overburden, clay,ZITHOLELE CONSULTING