Abstract: A permanent storage vault for hazardous waste materials provides a water-confining basin liner for an excavation basin, a liquid collection system to collect liquids from the basin liner and a double encapsulation for the waste materials including a water-impervious film encapsulation and, surrounding that, an encapsulation of water-impermeable cementitious material. A sump is provided to collect liquids accumulating on the basin liner.

Abstract: A permanent bin for temporary storage of non-volatile chemical hazardous wastes is provided. An excavation basin is lined with a water-impervious film and a water-impermeable cementitious covering. The bin is formed from perimeter walls which are positioned within the rim of the water-impervious cementitious covering. A liquid collection system is provided to retain any drainage from the system for prompt detection, appropriate analysis and for effective disposal if required.

Abstract: A compartmentalized waste disposal installation includes multiple disposal vaults, each positioned above a normal high water table level of the region. The vaults are disposed in parallel relationship and are stacked in two or more tiers to provide a compact permanent waste disposal facility. Each individual waste disposal vault provides water-impermeable encapsulation for the waste disposal materials and each individual waste disposal vault is positioned within a basin which has a water-impervious lining and a collection system for recovering leakage or leachate which may develop from each individual waste disposal vault.