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Cleanup Goals Met Post PetroFix Application
Case study highlights:
- Injecting PetroFix was the lowest cost option and fastest route to site closure
- An air sparge/multi-phase extraction (AS/MPE) system provided significant reductions to PHC concentrations, but was unable to meet required cleanup levels
- PetroFix application quickly achieves cleanup goals and sustains reductions for over two years
This case study reviews a former gasoline station located in the Florida Panhandle, where an underground storage tank (UST) release site is now poised for closure. After reviewing the available remedial options, Advanced Environmental Technologies, LLC (AET), a leading environmental consulting and engineering firm, determined PetroFix® Remediation Fluid would provide the most economical and efficient means to reduce concentrations below the groundwater cleanup target levels and achieve site closure. Injection of PetroFix, a field-proven, colloidal activated carbon technology developed for PHC treatment, is a highly targeted and minimally invasive in situ approach, requiring low pressure for injection delivery. Since this was an active business, these features were favored for the minimal impact on operations compared to other approaches.
PlumeStop Successfully Remediates PFAS at Alaska Airport
Case study highlights:
- Targeted PFAS contaminants remediated to below detection limits at airport site
- Challenging environmental conditions overcome for a successful PFAS source zone treatment
- PlumeStop application has completely remediated the five individual PFAS targeted, reducing concentrations from 1,200 ng/L to non-detect
This case study reviews a site where PlumeStop® Colloidal Activated Carbon was applied to treat PFAS resulting from aqueous film-forming foam (AFFF) usage at an airport facility in Alaska. The application has reduced the five targeted PFAS below detection limits and applicable cleanup levels in a challenging hydrogeologic environment over a sampling period now approaching two years. In 2017, Fairbanks International Airport began an investigation in collaboration with the Alaska Department of Environmental Conservation and the Fairbanks office of Shannon & Wilson, a leading Pacific Northwest-based environmental consulting firm, to investigate the extent of PFAS migration from the site. Shannon & Wilson engaged REGENESIS for a pilot test plan to remediate one of the identified AFFF release areas, following successful treatments demonstrated at other sites.
225m Permeable Reactive Barrier Treats TCE and Chromium (VI)
Case study highlights:
- A large-scale remediation project with challenging conditions: geology, underground services, ongoing site use and multiple stakeholders
- Treatment of a co-mingled chromium (VI) and TCE plume via enhanced biological dechlorination and chemical reduction, using: S-MicroZVI,
3-D Microemulsion and BDI Plus - Pilot study proves appropriateness of the proposed in situ remedial solution, allowing regulatory sign off for the full scale works.
- Post remediation monitoring results to date show significant chromium reduction and TCE below detection limits
Sustainable and cost-effective remediation of a co-mingled plume in a sensitive chalk aquifer. A 48 hectare site in the UK was to be redeveloped for mixed commercial and residential use. The existing site included a mix of historic and existing industrial land use, including a metal plating works, surrounded by agricultural land and residential housing. The Mott MacDonald engaged early with REGENESIS regarding potential options for remediation.
New York Brownfield Site Treated for PFAS Achieves Closure
Case study highlights:
- NYSDEC certifies cleanup requirements achieved, making the site eligible for redevelopment
- Brownfield cleanup program’s green remediation policy leads to PlumeStop for PFAS treatment
- PlumeStop barrier for PFAS treatment is a key component in pursuit of site closure
- Skillfully managed PlumeStop application achieves GSR and cost reduction objectives
This case study reviews a 25-acre former refinery located in a mixed-use industrial/commercial area that was contaminated with PFAS. Benchmark Environmental Engineering & Science, PLLC & TurnKey Environmental Restoration, LLC (Benchmark & TurnKey), a leading engineering and redevelopment consulting company headquartered in Buffalo, New York, engaged REGENESIS for an in situ remedy that would effectively and economically cut off the plume and prevent migration of PFAS offsite. The site was entered into the New York State Department of Environmental Conservation’s (NYSDEC’s) Brownfield Cleanup Program (BCP) to facilitate its commercial redevelopment. Remedial alternatives were evaluated for a comprehensive site closure strategy, and approaches were scored based on NYSDEC’s Green Remediation Policy Document DER-31, which considers the “environmental impacts of treatment technologies and remedy stewardship over the long term.”
PlumeStop Barrier Protects Drinking Water Supply Wells
Case study highlights:
- Innovative remedial approach addresses large PCE plume at a bedrock site under the CERCLA-Regulatory Framework
- Substrates successfully addressed contaminants in the Ogallala Sandstone
- PlumeStop PRB successfully cut off PCE and chlorinated solvent daughter products and prevented further movement downgradient toward private water supply wells
This case study reviews a former chemical manufacturing facility in Texas where PlumeStop® Colloidal Activated Carbon was used in a permeable reactive barrier (PRB) to halt the movement of chlorinated solvents in groundwater. EA Engineering, Science, and Technology, Inc., PBC, a leading multi-disciplinary environmental and engineering consulting firm, contracted REGENESIS to implement the solution. PlumeStop was to be applied as part of an in situ bioremediation PRB near the distal end of the plume to promote sorption-enhanced natural attenuation of the contaminants.
>99% Contaminant Reduction at Largest Train Maintenance Depot in Northern Europe
Case study highlights:
- Carefully designed integrated remediation strategy used physical, chemical, sorptive and biological treatment
- Innovative use of PetroFix Permeable Reactive Barriers (PRBs) completed to prevent residual contaminant egress from outside of the treatment area and protect against future spills
- Significant reductions of petroleum hydrocarbons have been achieved onsite – starting with LNAPL and reaching stringent target values – within nine months
This case study reviews the in situ remediation strategy implemented across the largest train maintenance depot in northern Europe, located in Hagalund, Sweden. As part of the remedial application, Swedish remediation contractor Envytech installed a network of additional monitoring wells across the site. This was done to better delineate the plume and identify any unknown contamination prior to commencement of remediation. Site investigations identified LNAPL across much of the northern area of the site, which required a revised groundwater remediation strategy.
PCE Concentrations Greatly Reduced within 30 Days
Case study highlights:
- High PCE concentrations were detected in soil and groundwater during a site investigation
- A pragmatic, phased approach was used to target PCE in soil and groundwater
- The multi-component treatment was immediately effective and has maintained 98% PCE reduction in onsite groundwater
The site is a former dry-cleaning supply distribution business that operated from 1957 to 2000. The former facility provided laundry chemicals, including detergents and spotting chemicals, packaging products such as hangers and polyethylene bags, and bulk deliveries of tetrachloroethene (PCE). Remediation at the site was completed in two primary phases. The first phase was a targeted excavation and soil mixing event focused on addressing the highly impacted shallow soils and smear zone. The second phase was focused on treating the groundwater PCE plume onsite and preventing further plume migration offsite.
DNAPL to Non-Detect: 6 Orders of Magnitude Reduction of Chlorinated Solvents
Case study highlights:
- Extensive chlorinated solvent contamination on a complex site was remediated using in situ treatment, including Enhanced Reductive Dechlorination (ERD) and a PlumeStop injectable Permeable Reactive Barrier (i-PRB).
- High-contamination areas saw significant reductions in chlorinated solvents, including potential Dense Non Aqueous Phase Liquid (DNAPL).
- A combination of sorption and ERD technologies achieved and maintained very low contaminant concentrations, meeting strict regulatory requirements and allowing for site closure.
Combined in situ sorption and biological degradation leads to site closure of large manufacturing site in Northern Italy. Chlorinated solvents were used for many years at a former manufacturing facility in Northern Italy. This resulted in contamination of the groundwater underlying a large proportion of this 60,000 m2 site. Groundwater concentrations of up to 155,000 μg/L TCE meant there was a suspected presence of Dense Non Aqueous Phase Liquid (DNAPL) on parts of the site. The contamination posed an unacceptable risk to both on- and off-site receptors and it was determined that active remediation was required on a large proportion of the site.
PFAS Removed from Aquifer at Hazardous Site Where AFFF Was Used
Case study highlights:
- Total PFOS and PFOA reduced from 91,400 to <50 ng/L in one month
- Injection testing effectively used for design confirmation in PlumeStop PFAS remediation pilot study
- Application included innovative injection using straddle packer system to isolate vertical zones
This case study reviews a Pennsylvania Hazardous Site Cleanup Act (HSCA) project where aqueous film-forming foam (AFFF) extinguished a large fire in the 1980s was the target of an innovative pilot study to address per- and polyfluoroalkyl substances (PFAS). Working closely on behalf of the PADEP, Tetra Tech, a leading provider of consulting, engineering, and technical services worldwide, was principally involved in assessing the options and choosing a technology for the pilot test. This effort led to the decision to conduct a pilot study using PlumeStop®, a patented colloidal activated carbon amendment known to eliminate the risk of PFAS. In 2016, a public supply well in the area was found to contain combined concentrations of perfluorooctanesulfonic (PFOS) and perfluorooctanoic acid (PFOA) exceeding the Environmental Protection Agency’s (EPA) 70 parts per trillion (ppt) Health Advisory Level (HAL). Another public supply well was found to contain combined concentrations slightly below the HAL. Upon notification, the affected wells were taken offline and PADEP immediately investigated the surrounding area. The subsequent investigation revealed that PFOA and PFOS had impacted groundwater, resulting from the chemicals contained in the spent AFFF migrating through the surficial soils and underlying fractured bedrock at the site. In addition to the public supply wells, several potable drinking water wells in the area extracting groundwater from the bedrock aquifer were affected. Filtration systems were promptly installed on the affected domestic wells. With the immediate threats to drinking water addressed, attention turned to strategies that could prevent the further spread of PFOS and PFOA from the source area.
Injectable Permeable Reactive Barrier Stops MTBE and Benzene Plume
Case study highlights:
- Pilot test proves injectable permeable reactive barrier (i-PRB) successful at reducing MTBE and benzene
- Technologies used: PlumeStop and ORC Advanced
- Monitoring data includes sampling event at 27 months post-injection
- Full-scale treatment scheduled
Fuel losses at a former petrol filling station in western Belgium, had resulted in the contamination of soil and groundwater with petroleum hydrocarbons and oxygenate additives. During the decommissioning of the site the source area was remediated, however a residual groundwater plume was left in place. Having taken over the site from the previous owner, OVAM determined that this plume represented a potential environmental and human health risk. OVAM required active remediation to take place and Group Van Vooren worked with REGENESIS to develop a suitable strategy. Read the case study to learn more about this site, the remediation approach taken and the results achieved from the pilot test.
