Abstract: A hazardous waste site remediation process for decontamination of petrochemical and other toxic waste containing sites comprises in situ conversion of the site to a self contained process reactor which is then selectively operated by feeding a variety of treatment reagents thereto through a network of feed conduits and removing contaminants through removal conduits which collectively bring the contaminated materials to a collection area in the reactor where they can then be further treated or removed. A mobile trenching machine converts the site to a reactor by simultaneously placing contaminant impermeable walls while processing excavated materials such as by adding reactor reagents thereto and then immediately returning the processed materials to the location from which they were excavated in the site. Hydrocarbons or other useful by-products such as precious metals may be recovered from the soil.

Abstract: A casting containing toxic waste is made by centrifugally casting toxic waste in a pre-formed cage having heat conducting means therein. The casting is formed with suitable shielding materials selected as a function of the waste being cast. The finished casting contains passageways through which heat is removed. These passageways are oriented such that when two or more castings are stacked in abutment, the passageways of adjacent castings interconnect.

Abstract: A casting containing toxic waste is made by centrifugally casting toxic waste in a pre-formed cage having heat conducting means therein. The casting is formed with suitable shielding materials selected as a function of the waste being cast. The finished casting may contain passageways through which heat is removed. These passageways are oriented such that when two or more castings are stacked in abutment, the passageways of adjacent castings interconnect. Also disclosed is a method and apparatus for forming castings of polygonal exterior cross section having a contaminant barrier wall of substantially uniform thickness so that the waste storage volume of the castings is maximized and so that the castings may be stacked and stored in honeycomb fashion in a respository to minimize dead storage space.