Client Spotlight: Tracey Mulhern

Ask Tracey Mulhern, Associate Geologist with Farallon Consulting, what she likes most about her work and you’ll likely learn that providing superior client service is just one of the many aspects she enjoys. She begins, “I enjoy working with clients to come up with environmental solutions to meet their individual needs. I also enjoy the planning that goes into a site investigation or cleanup and seeing it completed.” Currently, Mulhern conducts project management of contaminated site investigation and cleanup at various sites throughout Washington. Learn more about Tracey’s work at Farallon in our client spotlight.

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PlumeStop Eliminates Offsite TCE Migration Meeting Site Goals in 60 Days

This case study reviews the site of a large-scale in situ groundwater treatment of trichloroethene (TCE) at a former industrial manufacturing facility in the Midwest that quickly achieved and then sustained performance objectives. TCE and low concentrations of other chlorinated volatile organic compounds (CVOCs), cis-1,2-dichloroethene, vinyl chloride, and 1,1,1-trichloroethane, were treated using an innovative sorption-enhanced reductive dechlorination (ERD) approach virtually eliminating contaminants by the first monitoring event within 60 days of application. A permeable reactive barrier (PRB), installed at the site property boundary, has maintained 100 percent reduction in TCE for over three years, meeting the application’s performance objectives by cutting off the site’s contribution to a more extensive groundwater TCE plume.


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.

Accelerated Treatment of Intermediate Compounds

BDI Plus is designed to provide rapid, effective treatment of undesirable anaerobic dechlorination intermediate compounds such as dichloroethene (DCE) and vinyl chloride (VC), and is a low-cost means of enhancing the anaerobic biodegradation process. Once in place, this microbial consortium accelerates the rate of chlorinated contaminant degradation from parent compounds to intermediates like DCE and VC and completely through to harmless end products such as ethene and ethane. It is highly compatible with a range of electron donors.

Over 8 Million Cubic Feet of Groundwater Treated In 13 Days

This case study reviews the site of a large-scale enhanced reductive dechlorination (ERD) treatment of chlorinated volatile organic compounds (CVOCs) applied in a fractured bedrock aquifer at a voluntary remediation site in Pennsylvania. REGENESIS Remediation Services (RRS) began the application in May 2020 and completed it in less than 13 days, averaging nearly 7,000 gallons of fluid volume injected per day at this active facility. In total, more than 260,000 combined pounds of 3DME, CRS and BDI Plus were injected for ERD treatment of the CVOCs. The extensive injection well network and large injection volume required RRS to develop an innovative injection process and containment design.

Long-Term, Low-Cost Remediation of Chlorinated Solvents

3DME (3-D Microemulsion) is an injectable electron donor optimized for low cost, long-lasting in situ remediation of chlorinated solvents. Its engineered, wide-area subsurface distribution significantly reduces the number of injection points and events required, resulting in time and cost savings. A viable, long-term source of staged-release hydrogen on the order of 2-4 years from a single application, this technology is faster and often lower cost than lengthy natural attenuation approaches

A Liquid Iron Based-Reagent for the Enhanced In Situ Chemical Reduction (ISCR) of Chlorinated Contaminants

CRS (Chemical Reducing Solution) is an iron-based amendment for in situ chemical reduction (ISCR) of halogenated hydrocarbon contaminants such as chlorinated ethenes and ethanes. This highly efficient in situ remediation technology contains a form of liquid iron which provides better distribution than can be achieved by directly injecting a solid iron material into the subsurface. The product allows for seamless integration with anaerobic bioremediation, and is easy to apply with the electron donor 3-D Microemulsion.

Video Shows How PetroFix is Easily and Safely Applied to Effectively Treat Petroleum Contaminants

This video shows PetroFix being easily and safely mixed and injected at an oil spill site in the United Kingdom. Environmental consulting firm Seed Environmental performed the application to treat the petroleum contaminants in the aquifer in situ via direct push injection. PetroFix is a cost-effective, dual-functioning activated carbon solution designed to remediate petroleum spills and provide immediate results for gas stations and UST sites.


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.