Nitra-Seal Specified to Mitigate VOCs for Urban Atlanta Townhome Development

Estimated Reading Time: < 1 minute

Case study highlights:

  • Nitra-Seal protects future residents of new urban townhomes
  • Total Vapor Solutions selected Nitra-Seal and TerraVent for this site after soil and gas samples revealed the need for a vapor intrusion mitigation system.
  • It was determined that Nitra-Seal should be laid across every foundation, but ventilation needs were not uniform for all the buildings.

A leading national builder of luxury homes recently acquired a brownfield site in Midtown Atlanta with plans to develop a large-scale multi-phase townhome project. The developer planned to construct nine individual buildings on the site, each ranging from 4,000 to 6,000 square feet, with multiple townhouse units inside. Slab-on-grade foundations were set, but construction could not continue without understanding each building’s vapor intrusion risks and creating a plan to provide reliable protection for future residents.

Buxton

PetroFix Chosen as Most Cost-Effective Approach

Estimated Reading Time: < 1 minute

Case study highlights:

  • PetroFix Remediation Fluid was chosen because it is specifically designed to treat PHC plumes stemming from bulk storage, gas station, and UST spills.
  • The responsible party plans on closely monitoring the site and is using PetroFix on other CERCLA/RCRA-funded sites to accelerate site closure.
  • The crew was able to make real-time adjustments to injection volumes, pressure, tooling, and locations to accomplish the distribution goals.

This case study reviews a PetroFix application to address hydrocarbon contaminants at the former Buxton Naval Auxiliary Air Station, located within the Cape Hatteras National Park in the Outerbanks region of North Carolina. The US Navy utilized the site as a submarine monitoring station from 1956 to 1982. The US Coast Guard (USCG) acquired the facility after 1982 and used the site as a logistical, communication, medical, and supply support center. The site contains four areas of investigation which encompass a total area of approximately 50,000 square feet. Since 2011, the site has been undergoing long-term monitoring. Although the monitoring shows natural attenuation occurring, persistent exceedances of petroleum hydrocarbons warranted additional remediation efforts. In the process of a thorough evaluation of viable remedies, the responsible party specified PetroFix micron-scale, liquid-carbon amendment to be applied to quickly and effectively address the contaminant levels and achieve their site goals of NFA.

NFA Status Achieved at Virginia Gas Station Site

Estimated Reading Time: < 1 minute

Case study highlights:

  • PetroFix quickly reduced BTEX, Naphthalene, and THP-GRO Concentrations to reach site goals
  • Pollution Complaint Case Closure granted by the VADEQ in less than one year post-application
  • Single application of PetroFix addressed contaminants of concern to help site reach closure

This case study reviews a former retail fueling center in Virginia where Sovereign Consulting was hired to demolish the site and remove a 25,000 gallon underground storage tank (UST) which was also the source of the LNAPL contamination. Working with the Virginia Department of Environmental Quality (VADEQ) Sovereign conducted a Site Characterization Assessment and following monitoring was then retained by their client to demolish the fueling center and remove the 25,000-gallon gasoline UST and the associated fueling system which represented the source of the contamination. Once the source of contamination (UST) and the free-product was addressed, Sovereign worked with REGENESIS to formulate and execute a groundwater remediation plan that used PetroFix. Unlike other groundwater treatment materials, PetroFix was utilized due to its dual function – it quickly removes hydrocarbons from the dissolved phase by absorbing them onto the activated micro-carbon particles and the electron acceptors promote hydrocarbon biodegradation in situ to encourage continued remediation. This combination resulted in a rapid decreases in contamination in weeks as opposed to months as determined through monitoring well groundwater sampling and the corresponding concentration curves for each chemical of concern.

Martinsville, IN

PlumeStop Arrests PCE in Fast Moving Aquifer

Estimated Reading Time: < 1 minute

Case study highlights:

  • PlumeStop effectively treated the plume in the well-oxygenated, sand and gravel lithology
  • 99% reduction of PCE ~30 days after the application in key monitoring wells
  • Demonstration of PRB leading to full-scale treatment in Spring 2020

This case study reviews a former dry-cleaning site in Martinsville, Indiana that had a perchloroethylene (PCE) release which contaminated the community’s groundwater with concentrations in excess of 370 parts per billion (ppb). After a successful pilot test and four monitoring events, environmental consulting firm Wilcox Environmental Engineering and the site owner decided to implement a full-scale application using PlumeStop. The sand and gravel aquifer created a challenging problem due to the high flow regime, with a groundwater velocity of approximately 1,560 ft/year and oxygenated geochemistry which had limited natural attenuation. The property owner, interested in the potential sale of the site, engaged Wilcox, a regional environmental consulting firm based in Indianapolis. After a thorough evaluation of possible technologies, Wilcox determined that PlumeStop® Liquid Activated Carbon™ in combination with HRC® and BDI Plus® could prevent the plume from migrating and would work in the well-oxygenated, sand and gravel lithology.

Scott AFB

Performance-Based Objectives Achieved at Scott AFB

Estimated Reading Time: < 1 minute

Case study highlights:

  • Impacted soil was caused by leaking underground piping and removal of two large UST’s
  • Second round of direct push injections included PetroFix to treat lingering BTEX
  • One month following application of PetroFix, BTEX levels were at non-detect and have continued to remain at that level for 5 sampling events

This case study reviews the Corrective Action Plan (CAP) at Scott Air Force Base, a large military base located in Southwestern Illinois that was contaminated with petroleum impacted soil. One month following the application of PetroFix™, contaminant levels reached non-detect. Benzene continued to remain non-detect through March 2020 and the site was recommended for no further action. The final CAP Addendum proposed two rounds of groundwater treatment by injection at Former Tank 85 to reduce benzene concentrations below the groundwater remediation objectives. The first round of injections was completed in February through March 2018 and consisted of the use of REGENESIS’ RegenOx®, coupled with ORC Advanced® to stimulate aerobic bioremediation. The initial injection was successful in reducing most contaminants within the affected area. The second round of injections at the former UST was completed in March 2019 using REGENESIS’ PetroFix micron-scale remedial fluid.

pfas case study

PFAS Contaminants Reduced to Non-Detect

Estimated Reading Time: < 1 minute

Case study highlights:

  • All 14 PFAS compounds, including short chains, were reduced to ND within 6 weeks with maintained reductions through twelve months
  • Successful pilot test resulted in full scale treatment
  • Modeling performed by IRSL suggests that this reduction will be maintained for over 30 years without the need for further re-injection

This case study reviews a bulk storage facility located in the Middle East region that had released a mixed plume of petroleum hydrocarbons and Per and Polyfluoroalkyl substances (PFAS). PFAS constituents were effectively reduced to non-detect following the application of PlumeStop and have remained at these levels for twelve months post-application. The goal was to achieve mass reduction in all groundwater contaminants in order to mitigate the risk of contaminant migration to an offsite receptor. InSitu Remediation Services Ltd. (IRSL) was engaged to develop a remediation approach for the contaminated site. IRSL has had prior success treating a similar mixture of PFAS and petroleum contaminants at previous sites, using PlumeStop to sorb the contamination from the groundwater. IRSL worked alongside REGENESIS to design a pilot study to ensure the feasibility to treat the affected saline aquifer.

ZVI application

Remediation of TCE Plume Speeds Sale of Brownfield Site

Estimated Reading Time: < 1 minute

Case study highlights:

  • REGENESIS’ micron-scale ZVI is applied under low-pressure and does not require fracking
  • In just one month following the application, monitoring shows successful reduction of the TCE plume
  • Hargis + Associates and Gregg Drilling helped to implement an innovative drilling design which applied the remedial agent through ten points simultaneously at under 50 psi

This case study reviews a former manufacturing site in Fullerton, CA, where a trichloroethylene (TCE) plume contaminated the groundwater and prevented the sale of the brownfield site. REGENESIS designed an injection plan using micron-scale Zero Valent Iron (ZVI) due to its proven ability to effectively reduce contaminant levels within a subsurface environment. In order to complete the remediation and move forward with the sale, Hargis + Associates worked with REGENESIS to develop an in situ chemical reduction (ISCR) design to address the plume. Regulatory limits on pounds per square inch (psi) were enforced for all injections. REGENESIS, Hargis + Associates, and Gregg Drilling worked closely with the regulatory agency to ensure that the remediation and injection of the ZVI would be completed at a low pressure. After gaining regulatory approval, Gregg Drilling injected 50,000 gallons at less than 80 psi. Within a month, this low-pressure application yielded as much as 100% reductions in some zones.