Abstract: An improved process for the remediation of soil contaminated by the presence therein of organic or semi-volatile inorganic contaminants which comprises (1) supplying thermal energy to the soil at one or more locations under the surface of the soil, (2) collecting the vapors resulting from contaminant vaporization or decomposition under the influence of the thermal energy, after passage horizontally through the soil, at one or more locations under the surface of the soil and separating from the collected vapors the environmentally undesirable components thereof.

Abstract: The primary purpose of the present invention is to preseal a pit by adding a specially designed sealing material to the pit bottom prior to putting other materials, e.g., waste material, into the pit, e.g., a disposal pit.In accordance with the present invention a method for sealing the bottom of a pit is provided to minimize leakage from the pit comprising mixing a sealing material preferably an admixed soil liner in combination with bentonite clay or a bentonite/polymer (e.g., polyurethane-polymure) mixure mixed with native soil, in a fluid mixing tank, such as far as for preparing drilling mud for a well, connecting a pump and hose to the fluid mixing tank, dispensing a layer of the sealing material from the fluid mixing tank through the pump and hose and onto the bottom and sides of the pit, e.g., a disposal pit, and allowing the dispensed layer of sealing material to seal the bottom and sides of the pit. Preferably, the method includes removing materials, e.g.