A formulation for the bioremediation of soil or groundwater includes from about 80 to 95% of an emulsifiable C4-C22 vegetable oil selected from the group consisting of soybean oil, coconut oil, rapeseed (canola) oil, peanut oil, crambe oil, sunflower oil and combinations thereof; and from about 5 to 20% of an emulsifier selected from the group consisting of a vegetable oil derived from a C16-C20 fatty acid ester or a mixture of such esters. The efficacy of the formulation is improved by adding hydrogen-enriched water to the emulsifiable oil as a dilution fluid.
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