NOVELTY - Biodegradation of hazardous hydrocarbon and/or ether wastes present in subsurface soil involves mixing a proppant, sodium percarbonate coated with polyvinylidene chloride, and water to form a slurry; injecting the slurry into the subsurface soil at a hydraulic pressure to form fractures in the subsurface soil; and establishing colonies of bacteria within the fractures.    USE - The process is used for biodegradation of hazardous hydrocarbon and/or ether wastes including methyl t-butyl ether, benzene, toluene, ethylbenzene, xylenes, and/or contaminants derived from gasoline and/or diesel fuel (claimed).    ADVANTAGE - The inventive process eliminates the need for surfaces devices or equipment and thus no maintenance, because this is a one time introduction of the solid oxygen source (SOS) with the hydraulic fracturing. It provides no chance of contaminant spread because the process relies on the slow diffusion of oxygen from the SOS. Introduction of the SOS deep into the subsurface makes it practical for the slow release of the oxygen from the SOS, and thus makes it practical for bioremediation. Because microorganisms designed to most effectively degrade the contaminant and nutrients can be added at the time of hydraulic fracturing, the process assures the presence of the appropriate microorganisms and nutrients needed to complete bioremediation. The polyvinylidene chloride encapsulated sodium percarbonate has a long shelf life, i.e. at least 6 years.    DETAILED DESCRIPTION - Biodegradation of hazardous hydrocarbon and/or ether wastes present in subsurface soil involves mixing a proppant, sodium percarbonate coated with polyvinylidene chloride, and water to form a slurry; injecting the slurry into the subsurface soil at a hydraulic pressure to form fractures in the subsurface soil, where the proppant serves to hold open the fractures; and establishing colonies of bacteria within the fractures. The bacteria are capable of digesting and degrading the contaminants, and the encapsulated sodium percarbonate serves as a solid oxygen source for supplying oxygen to the bacteria.