Arun Wahi, Senior Hydrogeologist with INTERA Inc.

Arun Wahi, Senior Hydrogeologist with INTERA Inc., a leading international geosciences and engineering consulting firm, specializes in contaminant fate and transport analyses of organic and inorganic contaminants and radionuclides, including numerical models of vadose zone and groundwater flow and transport. He shares, “I enjoy the challenges associated with mathematics and learning new chemistry of emerging contaminants or forensic techniques, but the most rewarding part of my job is influencing concrete actions that protect human health and the environment.” Learn more in our client spotlight.


Arun Wahi, Senior Hydrogeologist with INTERA Inc.

Combined Remedy Reduces Chlorinated Solvents to Achieve Closure Status with Florida DEP

PlumeStop and HRC Applied at Florida Retail Mall to Address CVOCs

This case study reviews the site of a chlorinated solvent spill as part of former dry cleaner operations at a retail shopping center in St. Petersburg, Florida. AECOM®, a global environmental consulting firm, was engaged to develop a solution for the site. The application called for an in situ groundwater treatment of low-concentration chlorinated volatile organic compounds (CVOCs). AECOM enlisted REGENESIS to design and implement an innovative sorption-enhanced reductive dechlorination (ERD) bioremediation approach for treating the CVOC contaminants. The results of the effort led to the Florida Department of Environmental Protection issuing a Site Rehabilitation Completion Order, releasing the property owner from further obligation to conduct remediation at the project site (i.e., site regulatory closure).


Turn Polluted Aquifers into Purifying Filters with PlumeStop

PlumeStop Liquid Activated Carbon is a break-through groundwater remediation technology that reduces dissolved phase contaminant plumes in days. Composed of extremely fine particles of activated carbon (1‐2μm) suspended in water through a proprietary dispersion chemistry, PlumeStop flows into the subsurface at low pressure and achieves consistent, reliable distribution – a capability unlike any other form of activated carbon used for groundwater remediation today.

Low-cost Bioremediation of Chlorinated Solvents

HRC is an engineered, hydrogen release compound designed specifically for enhanced, in situ anaerobic bioremediation of chlorinated compounds in groundwater or highly saturated soils. HRC enables enhanced anaerobic biodegradation by adding hydrogen (an electron donor) to groundwater and/or soil to increase the number and vitality of indigenous microorganisms able to perform the naturally occurring process of enhanced reductive dechlorination. Due to its capability of being applied via permanent wells, direct-push, and excavations, this reagent allows for clean, low-cost, non-disruptive application.



Remediation of Chlorinated Solvents with PlumeStop Liquid Activated Carbon









PlumeStop technology can be applied to inhibit spreading of contaminant plumes, to protect sensitive receptors, or to prevent contaminant migration across property boundaries. It is also an effective tool for control and treatment of groundwater contamination associated with low-permeability porous formations and matrix back-diffusion, promoting diffusion out of the immobile porosity while preventing groundwater impact, and for treating sites with very low contaminant concentrations. Once in place, PlumeStop is expected to last for decades with minimal impact on aquifer oxidation-reduction potential, permeability and geochemistry.



Webinar Now Available: A State Regulator’s Perspective on PFAS in Minnesota

In this webinar we were pleased to have as a special guest speaker Ginny Yingling, Senior Hydrogeologist at Minnesota Department of Health. Her presentation shared a state regulator’s perspective on PFAS in Minnesota. She was joined by Scott Wilson, President & CEO at REGENESIS, who discussed the extent to which colloidal activated carbon has been accepted by the remediation industry as a low-cost method of eliminating PFAS risk.



About the Presenters:

Ginny Yingling
Senior Hydrogeologist, Minnesota Department of Health Environmental Health Division

Ginny Yingling is a Senior Hydrogeologist in the Environmental Health Division of the Minnesota Department of Health. She works with a team of Health Risk Assessors to evaluate human exposures to harmful chemicals in drinking water related to man-made contaminated sites. Since 2003, she has been the agency’s lead investigator of per- and polyfluoroalkyl substances (or PFAS). Ginny is also the co-chair of the Interstate Technology and Regulatory Council’s PFAS Team, a group of over 390 environmental professionals drawn from state and federal agencies, academia, industry, consulting, and public interest groups.


Scott Wilson
President & CEO, REGENESIS and Land Science

Scott Wilson has extensive experience in the development and application of advanced technologies for groundwater and soil restoration and vapor intrusion mitigation. He is a widely published expert with over 30 years’ experience designing, installing and operating a broad range of remediation technologies. He has expertise in project management and has directed the successful completion of large industrial remediation programs under State and Federal regulatory frameworks. At REGENESIS, on specific projects, he plays an active role in technical oversight and program management to ensure conformance with customer expectations.



REGENESIS has remediation experts based worldwide to assist you in your brownfield site cleanup. As the technology leader in advanced bioremediation solutions, we can help ensure success on your next remediation project. Use the map on our website to find your regional REGENESIS contact today.

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