Presenter:  John V. Fontana, CPG, CWD, Vista GeoScience

Over the past 40 years, in-situ remediation has advanced from early experimental injections to a versatile suite of proven technologies. This one-hour presentation begins with a concise history of reagent chemistries and delivery methods, then moves into an overview of today’s state-of-the-art practices for optimizing injection strategies and remediation performance.

Key treatment targets—petroleum hydrocarbons, chlorinated solvents, dissolved metals, and emerging contaminants such as PFAS—will be addressed. Attendees will learn about the full spectrum of available reagents, including oxidants, reductants, biological amendments, and sorption-based remedies, and how integrated approaches can be combined for maximum impact. The session will also highlight essential elements of the recently released ITRC guidance, with emphasis on the benefits of remedial design characterization (RDC) and on matching delivery technologies to site-specific challenges like low-permeability soils and fractured bedrock.

Finally, the presentation will reflect on lessons learned from early applications—why some strategies fell short—and how advances in chemistry, design, and injection technology now lead to greater success. In the end, remediation remains a “contact sport,” where success comes from the right tools, a sound strategy, and precise execution.