This material has been shown (3, 4) to be permeable but with some capacity to retain water; to be adequately traffic bearing, to be non combustible, heavy and abbrasive enough to prevent litter problems and to behave as a highly effective biofilter withrespect to odour (50-70% reduction). This material is also readily available at landfill sitesand 300mm thick layers adds to the gas generation potential and energy recovery value ofthe site long term. Some low permeability interim cover does need to be used to make gasharvesting close to the active face more efficient, but this material can be recovered from
above the MWM/earth mixture for reuse quite readily.