Project Name: Vissershok Cell 3C Mono-cell
Client: Vissershok Waste Management Facility (Pty) Ltd
Project Description: The Contract comprised the design, site supervision, quality assurance and contract administration of a new mono-cell (Cell 3C) at the Vissershok H:H Waste Management Facility. The Site is situated next to the N7 approximately 30km north of Cape Town CBD.
The cell was designed to landfill contaminated sand from a soil rehabilitation project at AECI in Somerset West.
The layer works for the floor of Cell 3C comprised of the following (from top to bottom):
- 200mm thick sand protection layer on floor and 1000g/m² non-woven geotextile as geomembrane protection layer on the side slopes.
- 2mm HDPE geomembrane (23 000m²)
- 4 x 150mm thick compacted clay layers
- A4 non-woven geotextile separation layer
- 150mm thick sand layer as a leachate leakage detection layer
- Rip and Re-compact 150mm thick in-situ clayey material
The layer works for the capping of Cell 3C comprised of the following (from top to bottom):
Inside slopes (slopes to be covered with waste eventually)
- 300mm thick stone layer of 38mm crushed rock
- 200mm thick sand protection layer on top of the cell and 1000g/m² non-woven geotextile as geomembrane protection layer on the side slopes
- 1,5mm HDPE Geomembrane
- Minimum 200mm thick clay capping layer
The design of the outside slopes (slopes to be permanently rehabilitated) has not yet been finalized since the cell is currently still in operation.
The topographically low point of the cell is drained into a gravity pipeline that drains into a pump sump which pumps the leachate to the leachate storage tanks. The leachate storage tanks consist of steel “Botanks” that are lined with 2mm HDPE geomembrane. The storage area has 2 of these tanks and each has a capacity of 222kℓ.
Location: South 33 46 18 East 18 32 06
Contract Data (Cell 3 Construction excluding capping work)
Contractor: Martin and East (Civil), Engineered Linings (Geosynthetic lining work)
Commencement date: 5 September 2005
Completion date: 1 December 2005