ORC Advanced, an oxygen release compound technology, stimulates in situ aerobic bioremediation of groundwater contaminated with petroleum-based hydrocarbons (e.g., methyl tertiary butyl ether, diesel fuel, jet fuel, gas condensates, fuel oils, lubricants, vinyl chloride, etc.). It is supplied as a nontoxic, environmentally benign powder that is mixed with water to form an injectable slurry, which is then pumped into the subsurface contamination zone with readily available direct-injection equipment.