KUSILE ASH DAM & COAL STOCK YARD
In November 2011, Eskom awarded WBHO the Contract for the Construction of the Kusile Combustion Storage Facility and two Ash Dam Dirty Dams. The Ash Storage Facility covers a footprint area of 1 080 900sqm. The system composes of five layers of geo-synthetic product, two layers of 2mm double textured HDPE geomembranes, two layers A8 bidim and one layer GCL. Two layers of natural materials completed the system. One layer of a 100mm washed river sand and 300mm of a graded non-angular G5. A network of small diameter pipes was installed in the G5 layer as well as 3 000m of large diameter pipelines (2.4m and 2,7m) were installed. A 8 000m large diameter U-shaped clean water drain was also constructed. The Ash Dam Dirty Dams had two ADDD’s, 73 000sqm each, constructed . These dams had two HDPE liners, A8 bidim and a caspated layer. Each dam had a 22 000sqm reinforced concrete covering. The Construction of the Coal Stock Yard was added to the Contract as a modification and consisted of; 300 000sqm of 275mm thick reinforced concrete, designed with 1 348 tons of reinforcing on top of graded G5 layer and two 1.5mm mono textured HDPE liner.