Basic Assessment Report - SRK

Basic Assessment ReportTanks must be double walled/”Jacketed” i.e. possessing secondary containment to preventtank content release into surrounding soil and ground water. The UST must have an interstitialleak detection monitoring system between the two walls to monitor for product leakage. ShouldSasol wish to make use of a single walled tank, the design specification must be discussedwith and approved by ACSA and the relevant approving authorities, including but not limited tothe EM and the DAEARD;• The USTs must be reliable in the event of heavy rains and flooding. UST manholes shall beimpermeable and resistant to fuel, they shall consist of a heavy duty cast iron cover, whichshall prevent damage from surface traffic; and• Construction of a reinforced concrete slab over the USTs, its thickness and strength is to bedetermined by a qualified Engineer and as approved by the eThekwini Municipality;Accessories• The filler point and tank must be fitted with overfill protection. The critical level should be suchthat a space remains in the tank to accommodate the delivery hose volume (2%). Earthing andsnap tight quick coupling is to be provided for loading of materials into tanks to minimise therisk of fires and prevent spillage and loss of materials; and• The USTs are to be fitted with a tank containment sump, fitted ontop of the tank and adispenser containment sump must be provided, fitted underneath the dispenser ascontainment. A Filler spill containment must also be provided for remote filler containmentpurposes;Pipework• Installation of associated pipe work. This shall include the installation of internationallyapproved non-corrosive pipework systems. All underground piping is to be Petrotechniks UPPExtra piping (nylon lined, 10 bar rated). Nextube Kableflex sleeving (oil industry green with asmooth internal bore) to be used as secondary containment. This is to limit the possibility ofpipe failure due to corrosion; this being the most common cause of pipe failure before thissystem was introduced to South Africa. Should Sasol wish to make use of alternative designspecifications these must be discussed with and approved by ACSA and the relevantapproving authorities, including but not limited to the EM and the DAEARD ;• All pipeline connections are to be housed within impermeable containment chambers. A leakdetector on all submersible pumps that automatically checks the integrity of the pipework onthe pressure side of the pump must be provided. Pipelines must not retain product after useand no joints are to be made underground. An emergency shut-off valve must be suppliedbetween the supply pipeline and dispenser inlet. All pipes (vent, filler and delivery) are to slopeback to the USTs so that fuel does not remain in the pipes;• Vent pipes to be fitted with “Fulcrum” vertical vent roses, or an approved equally equivalentmarket product replacement, that conforms to these standards. Confirmation of filler point andvent position to be made by an approved Engineer for safety distances required;• Vent pipes above ground are to be galvanised mild steel and are to be at least 1000mm abovethe roof height and away from any doors, windows, chimney openings and other sources ofignition; and• The tank product lines must be pressure tested prior to commissioning;Installation• The excavation must be protected against the ingress of surface run off water, and is to bekept reasonably free of sub-surface water by pumping out if necessary;• The tank farm must be lined with a HDPE liner or a suitable clay layer to prevent infiltration ofproduct to the ground water should a spill\leak occur (an impermeable liner is specificallyimportant if bedrock is encountered during excavation activities);Department of Agriculture,Environmental Affairs & RuralDevelopment, KwaZulu-NatalBasic Assessment Report 2010Version 2: August 2010Page 6 of 46