Remediation Plan Completed in Two Days at Former Service Station. No Further Action Received Following Successful PlumeStop® Application

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Remediation of BTEX and PHC in the Greater Toronto Area Using PlumeStop

Project Highlights

  • Regulatory standards met following single injection of PlumeStop
  • Remedial injection event completed in two days with the first clean samples obtained within three weeks post-injection
  • Effective design and approach led to time and cost savings for the client
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1m 41s reading time

Project Summary

A former gasoline retail station located in Whitby, Ontario, was the site of BTEX and PHC contaminants requiring remediation. Excavation, as well as pump and treat approaches, had been used to address contaminant levels, but groundwater remained impacted by BTEX and PHC F1 and F2 above regulatory standards. While the contractors were able to remove the majority of impacts, they were not able to remediate the site to the applicable regulatory standards.

The client hired INSITU Remediation Services LTD (IRSL), an environmental firm specializing in in situ remediation technologies, to reduce the levels and reach required standards safely and effectively following a tendered contract issued to a total of five contractors. IRSL was chosen based on their innovative approach and lower total cost. Using a proprietary design, IRSL injected PlumeStop Liquid Activated Carbon™, to remediate residual BTEX and PHC F1 and F2 groundwater impacts.

Technology Description

PlumeStop is an innovative in situ remediation technology designed to rapidly reduce contaminant concentrations, stop migrating plumes, eliminate contaminant rebound, achieve stringent cleanup standards and treat back-diffusing contaminants. PlumeStop provides a unique colloidal biomatrix platform which rapidly sorbs contaminants out of the dissolved-phase. Once contaminants are concentrated within the PlumeStop biomatrix, they can be completely biodegraded in place using compatible REGENESIS bioremediation products.

Results

The remedial program was completed in two days with the first clean samples obtained within three weeks post-injection. The BTEX and PHC plumes were treated to below the regulatory standards. Sampling has been performed over four quarters and the site has been deemed remediated.

About the Client

One of Canada’s most experienced remediation companies, INSITU Remediation Services Ltd. (IRSL) has designed, implemented, and maintained soil and groundwater remediation programs in diverse geological environments in North, Central, and South America, Europe and the Middle East.

Former Dry Cleaning Site Makes Way for Community Hospital Following Successful Treatment Using a Combined Remedy Approach

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cVOC Contaminants Reduced by 97% After Two Months

Project Highlights

  • Two months’ post injection results show contaminants were reduced by 97%
  • Combined remediation approach used to successfully keep project on budget and on schedule
  • Remediation design and amendments applied provided speed and certainty allowing for project to move forward
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1m 55s reading time

Former Dry Cleaners

Project Summary

A former dry cleaning site in Western New York was targeted for redevelopment to make way for a multidisciplinary, world-class cancer center. Before redevelopment could get underway, the developer needed to address the cVOC levels found on site which exceeded state regulatory standards. The developer engaged Benchmark/Turnkey, a leading environmental firm in the Northeast, to develop a solution to address the contaminant levels found. Benchmark/Turnkey worked with REGENESIS® to design a remedial strategy that included 3D-Microemulsion®, Bio Dechlor Inoculum® Plus, and Chemical Reducing Solution® to reduce the PCE, DCE and TCE contaminants. The design focused on speed and certainty, since the site was tagged for immediate redevelopment. Using a direct push application of the amendments, Benchmark/Turnkey was successful in applying the combined remedial approach on budget and on schedule.

Technology Description

3-D Microemulsion is an engineered electron donor material that offers a novel three-stage electron donor release profile, pH neutral chemistry, and is delivered on-site as a factory emulsified product.

Bio Dechlor Inoculum Plus (BDI-Plus) is an enriched natural microbial consortium species of Dehalococcoides sp. (DHC). This microbial consortium has been enriched to increase its ability to rapidly dechlorinate contaminants during in situ bioremediation processes.

Chemical Reducing Solution is an iron-based amendment for in situ chemical reduction (ISCR) of halogenated hydrocarbon contaminants such as chlorinated ethenes and ethanes.

Results

Following the injection event, the team monitored the results and at two months found that total cVOC contaminant levels had been reduced by 97%. Based on the progress to date and the concentration of contaminants versus nutrients remaining in the groundwater, Benchmark/Turnkey expects to collect groundwater samples for two intervening semi-annual events then petition the New York Department of Environmental Conservation to discontinue groundwater monitoring.

About the Client

Benchmark Environmental Engineering & Science, PLLC is a licensed professional engineering company that provides comprehensive civil and environmental engineering services. TurnKey Environmental Restoration, LLC is a “sister” company that provides site investigation, remediation and infrastructure construction, and environmental and site management service.

Remediation of Impacted Groundwater on a Busy Construction Site, UK

Estimated Reading Time: 2 minutes

REGENESIS was asked to provide a remedial solution to mitigate against the off-site migration of the contaminated groundwater. We designed a PlumeStop barrier and was subsequently employed as subcontractor on the works. The barrier injections were made along the downgradient boundary of the site, targeting the groundwater in a gravel formation at 2 – 5m BGL. On this site, PlumeStop was co-injected with ORC-Advanced to enhance the aerobic biodegradation processes in the subsurface.Read More

Contaminant Concentrations at an Active Gas Station Reduced by 90% Using PersulfOx® and ORC Advanced®

Estimated Reading Time: 2 minutes

REGENESIS Uses an Outside-In Application to Push 30-Year Old LUST Case to Closure in Remote Region of Arizona

Project Highlights

  • Innovative “Outside-In” approach incorporated injection design working from perimeter of the treatment area first, and progressively working toward the center
  • First event application completed within seven days with a second event completed in nine days the following month without disruption to active site
  • Closely managed injection wells to ensure proper distribution and avoid surfacing
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Project Summary

An active gasoline station in Springerville, AZ was listed as a hazardous Leaking Underground Storage Tank (LUST) site by the state of Arizona. After 30 years of unsuccessful remediation using a number of approaches, REGENESIS Remediation Services (RRS) was contacted to perform two separate injection events approximately one month apart. Both events included injections at 15 injection points over a range of depths. The first round of injections included a combination of PersulfOx and ORC Advanced. The second round of injections contained only PersulfOx.

During both injections PersulfOx and ORC Advanced were successfully applied within the treatment area and at the targeted treatment interval of 18 to 60 ft. bgs. Low to moderate injection pressures and application flow rates were observed at each of the injection well locations, indicating good distribution of the amendments. Increases in dissolved oxygen, conductivity, pH, and oxidation-reduction potential were observed, indicating good distribution and influence of the PersulfOx and ORC Advanced remediation chemistry.

Technology Description

PersulfOx is an advanced in situ chemical oxidation (ISCO) reagent that destroys organic contaminants found in groundwater and soil through abiotic chemical oxidation reactions. It is an all-in-one product with a built-in catalyst which activates the sodium persulfate component and generates contaminant-destroying free radicals without the costly and potentially hazardous addition of a separate activator. The patented catalyst enhances the oxidative destruction of both petroleum hydrocarbons and chlorinated contaminants in the subsurface.

ORC Advanced is an engineered, oxygen release compound designed specifically for enhanced, in situ aerobic bioremediation of petroleum hydrocarbons in groundwater and saturated soils.

Results

Since the two injections have been completed, three rounds of groundwater monitoring have been performed. Benzene concentrations have been reduced by 90% to 20 μg/L. A closure request has been submitted by the client awaiting regulatory approval.