British water control specialist Rawell has supplied the crucial waterproofing system for fuel tanks at Chek Lap Kok .
The project required an environmental protection barrier to the bunded area around the fuel tanks, while creating an impermeable layer immediately below the tank bases.
This was achieved using Rawell's Rawmat HDB waterproofing membrane over a compacted sub-base to provide a hydrocarbon-resistant, totally inert, natural clay barrier. The material consists of a geosynthetic clay liner, the face of which is a polypropylene fabric woven with air textured multi- filament yarns and the reverse of which is a polyester scrim. A layer of Rawpaste trowelling grade mastic added an immediate oil proof seal, followed by a 300mm layer of compacted sand, prior to sand-bitumen bedding and tank base installation.