Method and apparatus for in-situ chemical oxidation for soil and groundwater remediation

An apparatus for treating a contaminated site including soil and groundwater comprising:

• at least one injection well positioned upstream of the contaminated site;
• a chemical oxidant injected within the at least one injection well;
• means for directing groundwater to flow through the at least one injection well to pick up the chemical oxidant;
• and
• means for dispersing the groundwater with chemical oxidant to flow through contaminated site.

An injection well for delivering an oxidant to a site including contaminated soil and groundwater comprising:

• a sump partially embedded in bedrock;
• a screened interval interconnected with the sump;
• a well riser interconnected with the screened interval and extending from the screened interval to ground surface;
• and
• a cover positionable over the well riser.

A method for treating a contaminated site comprising:

• providing an injection well upstream of the contaminated site;
• introducing a solid chemical oxidant into the injection well;
• allowing groundwater to flow into the injection well;
• dissolving the chemical oxidant into the groundwater;
• allowing the groundwater with dissolved chemical oxidant to flow out of the injection well;
• and
• allowing the dissolved chemical oxidant to treat the contaminated site.