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Site Closure Achieved at Colorado Service Station
Benzene Levels Reduced to Below 5 PPB in Clay Soils through Use of ORC® Advanced
Project Highlights
- Benzene concentrations remained on-site despite previous excavation efforts.
- Enhanced aerobic biodegradation using ORC Advanced produced a 99.8% reduction over 12 months.
- Benzene reduced to below detection limits.
- “No Further Action” letter granted in October 2010.
Project Summary
Three underground storage tanks (USTs) were removed at a former tire store as part of corrective measures. Roughly 108 cubic yards of soils were excavated to reduce contamination levels. However, the excavation did not extend below the groundwater interface and residual sorbed contaminant mass remained, resulting in a lingering benzene plume. The client was interested in an in situ approach to reduce the remaining benzene contamination to below the Tier 1 risk based screening level of 5 ppb.
Remediation Approach
A direct-push injection of Oxygen Release Compound Advanced (ORC® Advanced) was chosen to reduce remaining soil and groundwater contamination at the location of the former excavation and well BW-1. Maximum TVPH and benzene concentrations in the prior two years were as high as 2.4 mg/L and 0.48 mg/L, respectively. Due to tighter soils, a 7-footon-center grid pattern with 15 injection points was implemented on-site. ORC Advanced was injected from approximately 6 to 13 feet below ground surface with about 1 foot of the injection interval extending above groundwater in the event of rising water levels. A total of 725 pounds of ORC Advanced was injected for this project.
Despite the relatively tight soils and high potential for contaminant back diffusion, the ORC Advanced treatment resulted in consistent downward trends of benzene contamination. A 96.3% reduction in benzene after only 3 months was observed. By month 12, a 99.8% reduction to below detection limits (The site was granted a no further action letter.)
Technology Description
ORC Advanced® is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled-release of molecular oxygen for periods of up to 12 months upon hydration.
RegenOx® Injected Into Frozen Permafrost at Alaska Site
Seasonal Access and Remote Location Require Unique Remediation Plan at Service Station
Project Highlights
- Sensitive ecosystem and limited seasonal accessibility required a unique remediation plan design.
- RegenOx® injected into frozen permafrost.
- Overall remediation plan requires three applications while site is accessible in summer months.
Project Summary
Located in Deadhorse, Alaska, this service station site was contaminated through multiple releases from the diesel and gasoline tanks. When this lease site was originally bid, it was required to be constructed with a minimum of 5 feet of gravel on the pads to protect the tundra. This lease requirement remains today.
The remote location on the North Slope of Alaska made it challenging to design, plan, and implement a remediation plan considering the temperatures were just above freezing. The area can only be accessed seasonally for monitoring/application and shipping products to the site proved to be a challenge. Located in a very sensitive native ecosystem (tundra/permafrost), in situ chemical oxidation (ISCO) was chosen as the remediation approach to avoid enlarging the plume.
Overall treatment goal for the project is to reduce hydrocarbon concentrations in approximately 365 cubic yards of source area soil to below cleanup levels. Treatment will be conducted in multiple phases and this project summary will summarize steps taken within the first year to address one-third of the exceedance area.
Remediation Approach
Surface soil to down to one-foot below ground surface was removed and stockpiled before subsurface soil from (1-5 feet below ground surface) was treated via in situ soil mixing using RegenOx®. Based on the effectiveness of Year 1 treatment; the plan is to use the same treatment method on remaining soil in subsequent years.
For the 125 cubic yards (or 1/3 of contaminated soil at the site), a total of 3,430 pounds of RegenOx (2,500 pounds of RegenOx Part A and 930 pounds of RegenOx Part B) were applied to treat BTEX, TPH, and naphthalene concentrations. Due to the sensitive and remote nature of the site, the application was staggered and the methodology was ultimately modified to prevent oversaturation and reduce the risk of plume migration. The Part B was mixed with a small amount of water and then applied and mechanically mixed thoroughly into the treatment area, followed by the Part A being applied dry and then well-mixed over the same area.
Technology Description
RegenOx is an advanced chemical oxidation technology that destroys contaminants through powerful, yet controlled chemical reactions and not through biological means. This product maximizes in situ performance while using a solid alkaline oxidant that employs a sodium percarbonate complex with a multi-part catalytic formula.
REGENESIS Remediation Services – LNAPL Treated with Combined Remedies
Active Michigan Service Stated Remediated Through Use of PetroCleanze® and ORC® Advanced
RRS was contracted to remediate a residual LNAPL and dissolved phase petroleum plume from historic gasoline and diesel fuel releases at an active service station. PetroCleanze® was chosen as the primary remediation technology to facilitate recovery of residual LNAPL and chemically oxidize contaminants without negatively impacting sensitive infrastructure. ORC® Advanced was also applied with the final PetroCleanze application event and in a downgradient plume cut off barrier to promote the enhanced aerobic bioremediation of the dissolved-phase petroleum hydrocarbons.
Eight injection/extraction wells and 28 direct-push injection points were used to apply the remediation reagents in the silty sand aquifer and smear zone over three application/injection events. Vacuum extraction was conducted between PetroCleanze applications to recover residual free phase petroleum hydrocarbons liberated from the soils. Reagent distribution monitoring confirmed PetroCleanze was dispersed across the targeted source area during each application event.
Prior to the first PetroCleanze application event, no measurable free product was observed on this site since 2006. Less than twenty-four hours after the first PetroCleanze application event, LNAPL was observed in four of the eight wells in the source area at quantities up to three inches thick.
Not more than a sheen was observed in any wells on site after the third injection event. A total of 2,160 pounds of PetroCleanze and 1,120 pounds of ORC Advanced were injected.
Regenesis Remediation Services™ – LNAPL Plume Treated at Iowa Service Station
PetroCleanze and ORC Advanced Remediate Historic Petroleum Hydrocarbon Contamination
RRS was contracted to remediate a dissolved phase LNAPL petroleum hydrocarbon plume petroleum fuel releases at a former service station PetroCleanze® was chosen as the primary remediation technology to facilitate recovery of residual LNAPL and chemically oxidize contaminants without negatively impacting sensitive infrastructure. ORC Advanced was also applied with the final PetroCleanze application enhanced aerobic bioremediation of hydrocarbons.
Eighteen direct-push injection points were used to apply the reagents in the silty sand aquifer and application events. Three vacuum extraction conducted after each PetroCleanze application to recover residual free phase petroleum hydrocarbons liberated from the soils.
Reagent distribution monitoring confirmed PetroCleanze was dispersed across the targeted source area during events.
Direct-push injection points were advanced to 15 feet below ground surface where bottom-up injections were performed to 5 feet. A total of 4,470 pounds of PetroCleanze and 720 pounds were injected.
Regenesis Remediation Services™ – TCE Plume Treated with Combined Remedies
Wisconsin Manufacturing Facility Remediated with RegenOx®, 3-D Microemulsion ®
A stainless steel tube manufacturing facility and their environmental consultant, Symbiont, selected Regenesis as a team member to assist in the design and implementation an in situ chemical oxidation and ERD remediation plan. The goal was to reduce trichloroethene (TCE) in source area groundwater over a 1.5 acre site from as high as 110,000ug/L to less than 10,000 ug/L using RegenOx, then transition to ERD. RegenOx® was applied through injection wells over three to five applications from 11/2007 to 6/2008. Five month later, ERD was started using 3-D Microemulsion® in this sandy surficial aquifer.
Successful Performance-Based Remediation Program at DOD Facility
Former Air National Guard Base in Ohio Treated for High TCE Levels
Project Highlights
- Highly technical design included three different remediation approaches requiring 105 injection points
- 87,000 lbs of PersulfOx successfully applied while not impeding operations at active military site
- Treatment area included injections through an 18-inch-thick concrete tarmac
- State-of-the-art mixing and application equipment allowed for optimal reagent injection in sub-zero temperatures
Project Summary
REGENESIS Remediation Services (RRS) partnered with an environmental consulting firm on a performance-based contract for a Department of Defense site remediation project in Ohio. A TCE plume was detected below the Air National Guard base with concentrations as high as 14,000 ppb. REGENESIS designed the remediation program and performed turn-key application services, including on-site treatment of excavated soils, in situ chemical oxidation through galleries within the subsurface, and injection points across the 16,000-square-foot plume. All operations were accomplished within an active military installation and included injecting through an 18-inch-thick tarmac into a sandy aquifer.
Injections took place during the winter months in below freezing conditions. RRS used heaters around the water supply and utilized their heated trailers to prevent the product and water from freezing. Over the course of two injection events, over 80,000 pounds of PersulfOx® Catalyzed Persulfate was applied to the contaminated area. Three application areas called for different remediation approaches with three horizontal injection galleries below a former excavation, nine injection wells down 27 feet below ground surface and a grid of 105 injection points around a hot spot source area. An additional 7,000 pounds of PersulfOx was applied to the bottom of the excavation site to treat the impacted soil. Application monitoring data collected throughout the field work documented the area of influence impacted by each application point.
Technology Description
PersulfOx is a sodium persulfate-based chemical oxidation technology which destroys both hydrocarbon and chlorinated solvent-type contaminants in the subsurface. PersulfOx contains a built-in catalyst which activates the persulfate component and generates contaminant-destroying free radicals without the need for the addition of a separate activator.
Results
Employing a highly technical remediation strategy, RRS successfully applied PersulfOx to three different areas using targeted remediation approaches resulting in performance-based remediation goals sequentially being met and ensuring a high level of client satisfaction.
Combined Remedies Treat Chlorinated Solvents at Gulf Coast Superfund Site
Former Industrial Facility and Landfill Pilot Test Shows Rapid Reduction in PCE, TCE and 1,2 DCE
Project Highlights
- Superfund Site once housed an industrial facility and landfill.
- Rapid reduction needed to avoid off-site migration of daughter products.
- Simultaneous application of Enhanced Aerobic Biodegradation, Bioaugmentation and In Situ Chemical Reduction (ISCR).
Project Summary
This former industrial property had a landfill that was used in the mid-1900s for disposal of magnesium dross and refractory brick as well as breakout material from electrolytic chlorine cells. As much as 254,000 cubic feet of material were removed from the landfill although a large chlorinated solvent plume remains both from landfill waste below the water table and from industrial operations on-site. A feasibility study for the site was approved in 2012 which evaluated the use of enhanced reductive dechlorination to treat dissolved chlorinated solvents at the site and to prevent off-site migration past the property boundary and beneath a highway. A pilot test to evaluate at least two different biological amendments was conducted and Regenesis supplied 3D Microemulsion, BDI, and CRS for the evaluation. Three aquifers exist at the site, but the pilot test was performed in the first groundwater bearing unit only.
Remediation Approach
After a review of sulfate concentrations, other natural attenuation data, and cVOC concentrations it was determined that the optimal treatment choice would be to test a combination of an electron donor in the form of 3-D Mircoemulsion®, a bioaugmentation culture called Bio-Dechlor INOCULUM® Plus, and the use of Chemical Reducing Solution® (CRS) to prevent any hydrogen sulfide toxicity and to promote a level of beneficial in situ chemical reduction (ISCR). For the pilot test 10 injections points were used to place 800 pounds of 3-D Microemulsion, 18 liters of BDI Plus and 400 pounds of CRS. The product was injected over a 10-foot interval.
The goal for this project was to attain as rapid reduction as possible for the site specifically to avoid off-site migration of daughter products such as vinyl chloride. Therefore, it was deemed beneficial to inject all three proposed products at once. The product was injected in March 2014 and results at roughly 1 month post injection are extremely promising. PCE has been reduced from 134 ppb to 1.57 ppb, TCE from 271 ppb to 1.77 ppb, and cic-1,2-DCE from 235 ppb to 4.25 ppb. Vinyl Chloride has shown some increase from non-detect to 13 ppb.
However, Dehalococcoides has increased from non-detect to 7 x 10×5 cells/bead and vinyl chloride reduced from non-detect to 9 x 10×4 cells per bead which strongly correlates to the rapid enhanced reductive dechlorination.
Technology Description
3-D Microemulsion is an engineered electron donor material that offers a novel 3-stage electron donor release profile, pH neutral chemistry and is delivered on-site as a factory emulsified product.
BDI Plus is an enriched natural microbial consortium containing species of Dehalococcoides sp. (DHC). This microbial consortium has since been enriched to increase its ability to rapidly dechlorinate contaminants during in situ bioremediation processes.
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.
Chlorinated Solvent Concentrations Reduced >100x within Six Months
Enhanced Reductive Dechlorination Used to Treat Former Dry Cleaner in South Carolina Coastal Plain
Project Highlights
- Small groundwater recovery system in place to provide hydraulic control.
- Enhanced Reductive Dechlorination (ERD) treatment selected to achieve site closure more quickly.
- High PCE concentrations reduced by more than 100x within 6 months and remain
- Follow-up treatments enhanced initial injection and contributed to continued dechlorination.
Project Summary
The site, located in the Coastal Plain of South Carolina, was impacted from former dry cleaning operations. A small groundwater recovery system had historically been used to provide hydraulic control, but the site owner wanted to move the site toward closure more quickly. Enhanced Reductive Dechlorination (ERD) with 3-D Microemulsion® was selected based on cost, ease-of-use and expected remediation performance. After the initial injection, PCE concentrations decreased by more than 100x within 6 months of application and remain below 5 ug/L two years after the initial injection.
Remediation Approach
The core of the plume was characterized by concentrations of 14-18 mg/L PCE at baseline plus the full suite of chlorinated ethene daughter products. An initial application of 3-D Microemulsion occurred in June 2011 over a 7,750-square-foot area in the surficial aquifer from 3-25 feet below ground surface. The injections were completed using direct-push equipment into temporary borings on 13-20 foot centers. Based on the success of the initial injection, a follow-up injection was completed in September 2013 over a much smaller footprint (2,200 square feet) to fill in treatment gaps near the upgradient edge of the initial treatment area and to supplement the 3-D Microemulsion in the core of the plume. The follow-up treatment has built on the initial treatment and is contributing to continued depletion of the chlorinated solvents.
Technology Description
3-D Microemulsion is an engineered electron donor material that offers a novel 3-stage electron donor release profile, pH neutral chemistry and is delivered on-site as a factory-emulsified product.
Chlorinated Solvents in Soil, Gas, and Groundwater Remediated at Former Manufacturing Facility
No Further Action” Status Achieved at Ohio Brownfields Site
Project Highlights
- Integrated Site Remediation coupling enhanced reductive dechlorination (ERD) and vapor mitigation was implemented to address the immediate risk of vapor intrusion and the long-term risk of identified CVOCs in groundwater.
- Combined remedy approach allowed site to be redeveloped as an apartment complex roughly 6 months following the groundwater treatment.
- “No Further Action” status and covenant not to sue letter was granted in 2013.
- Cost for groundwater water treatment was approximately $10 per cubic yard (product and application) and vapor intrusion mitigation was $3.34 per square foot with no long term O&M required.
Project Summary
The site, a former industrial magnet manufacturing facility in Ohio, received a $2.34 million Clean Ohio Revitalization Fund grant through the Ohio Department of Development in 2011. Site investigation activities identified chlorinated VOCs in groundwater and vapors above the state regulatory limits. Using a combined approach of ERD with vapor mitigation addressed the immediate risk of vapor intrusion and the long-term risk of groundwater impacts. By implementing this strategy, the site was allowed to be redeveloped as an apartment complex roughly 6 months following the groundwater treatment. “No Further Action” status and covenant not to sue letter was granted in 2013. The site currently operates as a residential apartment complex.
Remediation Approach
In the Spring of 2012, ERD using 3-D Microemulsion® and Bio-Dechlor INOCULUM® Plus was implemented within the defined 24,000-square-foot treatment area via direct-push injection. In Fall 2012, the Geo-Seal™ vapor barrier system was installed below a 15,522-square-foot apartment complex raised at the site. The cost for groundwater treatment was approximately $10/cy (product and application) and Geo-Seal was $3.34/sf (product and installation).
Technology Description
3-D Microemulsion is an engineered electron donor material that offers a novel 3-stage electron donor release profile, pH neutral chemistry and is delivered on-site as a factory emulsified product.
Bio-Dechlor INOCULUM Plus is an enriched natural microbial consortium containing species of Dehalococcoides sp. (DHC). This microbial consortium has since been enriched to increase its ability to rapidly dechlorinate contaminants during in situ bioremediation processes.
Geo-Seal is a composite system that creates the ideal blend between constructability and chemical resistance by using both high density polyethylene (HDPE) and spray applied asphalt latex.
Active Manufacturing Facility Remediated to Compliance Levels
Extensive Chlorinated Solvents Contamination Treated with Combined Remedies
Project Highlights
- Active manufacturing and low permeability soil caused application limitations.
- Combined use of 3-D Microemulsion®, Hydrogen Release Compound® (HRC) and Chemical Reducing Solution® (CRS) were used for the remediation approach.
- Significant reductions were observed in TCE, DCE and VC post-application.
- Site closure is pending regulatory approval.
Project Summary
The site, located in Southern New Hampshire, was contaminated with chlorinated solvents in soils, groundwater and surface water beneath and adjacent to a former industrial facility. After investigations to characterize the extent of contamination beneath and adjacent to the industrial facility caused by spills and aggravated by leaks in a storm drain underlying the building, a remedial action was designed and implemented. HRC applications were completed February 2008 and March 2011 to reduce cVOC levels in groundwater. The site had limitations that included reduced access because of active manufacturing inside the building and soil had reduced permeability. Significant reductions were observed in TCE, DCE and VC after the application. However, two wells remained above standards for DCE and VC with the assumption that HRC was not adequately distributed in that area. An application of 3-D Microemulsion® and CRS® was completed in May 2013. Significant reductions of DCE and VC were observed and levels were rapidly brought into compliance.
Remediation Approach
HRC was applied to stimulate the biodegradation of chlorinated solvents. Permanent re-injection points were installed in a grid layout so as to make it easy for re-application without additional construction or drilling activities. Surface water contamination was caused by contaminated groundwater leaking into the storm drain with discharge to the headwaters of a small stream downgradient of the facility. The contamination was addressed by air sparging within the drain pipe near the discharge point but before water discharged to the stream. The discovery of soil contamination causing low level groundwater contamination was addressed by excavating the soil source and disposing the soil off-site.
In the first three years after HRC injection, ¾ of the site was remediated at three source locations. One source area beneath the building exhibited persistent groundwater contamination. The remaining contamination appears to have been caused by poor HRC distribution resulting from underground cement blocks and low permeability soils. 3-D Microemulsion and CRS were injected at two locations surrounding where hot spots of 1,2-DCE and VC persisted at high levels. Recent measurements show significant reductions in the groundwater contamination indicating successful bio-stimulation of chlorinated solvent degraders in the hot spot areas.
Currently the site is under a Groundwater Management Permit which establishes a Groundwater Management Zone with eleven monitoring wells and one surface water monitoring point. Recent monitoring results show dramatic decreases in groundwater concentrations at the location of contamination persistence, and site closure is now projected to occur in the near future.
Technology Description
3-D Microemulsion factory emulsified is an engineered electron donor material that offers a novel 3-stage electron donor release profile, pH neutral chemistry and is delivered on-site as a factory–emulsified product.
HRC is a controlled release, electron donor material, that when hydrated is specifically designed to produce a controlled release of lactic acid. The newly available lactic acid is critical for the production of hydrogen to fuel anaerobic biodegradation processes in soil and groundwater.
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.
