System and method for remediating soil and groundwater in situ

A method for the in-situ removal or remediation of contaminants in a soil formation containing a subsurface groundwater aquifer, wherein the contaminants are spread out by diffusion, movement of the groundwater, and other mechanisms to form a contaminant plume, the method comprising the steps of:

• alternately injecting, in any order, a hydrogen peroxide solution, an ozone/oxygen mixture, and compressed gas into the aquifer at an injection point to treat the contaminants contained within the groundwater, wherein the injection of the compressed gas forces the groundwater away from the injection point into a saturated zone or smear zone of the contaminant plume thereby transporting the hydrogen peroxide solution and the ozone/oxygen mixture into the saturated zone or smear zone of the contaminant plume.

A method for the in-situ removal or remediation of contaminants in a soil formation containing a subsurface groundwater aquifer, the method comprising the steps of:

• intermittently introducing, individually and in any order, a first oxidant, a second oxidant, and compressed gas into the groundwater to treat the contaminants contained within the aquifer, wherein the introduction of each oxidant creates a volume of influence of each oxidant, wherein the introduction of the compressed gas increases the size of each volume of influence of each oxidant.