Abstract: Disclosed is a method of decontaminating subsurface soil and/or groundwater in situ through the underground injection, immediately after mixing, of water and a powderized formulation of a dry mixture of metallic peroxides, such as calcium, magnesium, sodium, or other metallic peroxides, blended with decomposition rate modifiers, pH adjusters and iron salts, which, depending upon the concentrations of these individual compounds, generates hydrogen peroxide and subsequent powerful oxidizing agents on a desired, timed-release basis over a first relatively short period of time (e.g. several days). The reaction between the hydrogen peroxide and the iron salts produces hydroxyl and perhydroxyl radicals which rapidly oxidize organic contaminants leaving a residual which time-releases oxygen to thereafter enhance intrinsic bioremediation processes over a second longer period of time (e.g. several months).

Abstract: A system and process for delivering fluids into subsurface contaminated soil and ground water to enhance in situ microbial degradation of contaminants. The system consists of a high pressure/low volume slurry pump driven by an internal combustion engine. Pressure and volume are variable to suit site-specific subsurface soil conditions (e.g. texture, intrinsic permeabilities, etc.). The high pressure fluid liquifies the soil in front of the probe tip allowing the probe to be easily advanced by hand into the subsurface while the low volume prevents driving the contaminants. Microorganisms, soluble and insoluble nutrients, surfactants and chemical peroxygens and also gases can be delivered into the subsurface with this system. After delivery of the fluids, the probe is withdrawn by hand.