Geosyntec to Present at 23rd Annual Florida Remediation Conference
Jim Langenbach, Jim Linton, Zackary Munger (Florida), and Jeff Roberts (Ontario) will present at the 23rd annual Florida Remediation Conference (FRC) at the Rosen Centre Hotel in Orlando Florida on December 7-8, 2017.
Jim Langenbach is the conference chair and Geosyntec will deliver three technical presentations. Jeff Roberts will represent SiREM, a division of Geosyntec.
The Florida Remediation Conference was launched in 1995 to provide professional education in the soil and groundwater cleanup industry. Now moving into its 22nd year, FRC has grown into one of the top technical conferences on soil and groundwater cleanup in the country, complete with continuing education credit for Florida Professional Engineers, Professional Geologists licensed in states with continuing education requirements, and other licensed professionals.
The Florida Remediation Conference is the Southeast's premier soil and groundwater cleanup conference of the year. Over 450 professionals attended for FRC 2016. Over the years, FRC has developed a solid reputation for a casual atmosphere that's conducive to good communications between all participants—speakers, attendees and exhibitors.
Opening Session: A Word from the Chair
Name: Jim Langenbach, PE, BCEE, Senior Principal, Geosyntec Consultants, Titusville
Time: 9:00 a.m.
Date: December 7, 2017
Title: The Application of Engineered Phytotechnology for Remedial System Optimization and Ultimate Site Closure of a Complex 1,4-Dioxane Site in Sarasota
Name: P. James Linton, Principal, Geosyntec, Clearwater
Session: 2: Innovative Assessment and Remediation Strategies
Time: 10:50 a.m.
Date: December 7, 2017
Groundwater at a former manufacturing facility was contaminated with chlorinated volatile organic compounds, the emerging contaminant 1,4-dioxane and arsenic resulting from historic activities. Complex conditions making site cleanup challenging included a complex lithology, a residual source area, and coalescing, on- and off-site dissolved-phase plumes. An ineffective pump-and-treat system was operated by others for 12 years, and an additional 25 additional years of costly O&M was anticipated to obtain closure. Geosyntec planned and conducted high-resolution site investigation activities to refine the conceptual site model and prepared a focused feasibility study for remedial optimization. Investigation tools included vertical lithology and groundwater profiling, pump testing and groundwater flow modeling. The results indicated that the shallow surficial aquifer, the upper 15 feet, was characterized by sands, silty sand/sandy silt with layers of shells and lithified zones, and clay comparable to coastal Central Florida. A 1,4-dioxane/CVOC source area was identified within the fine-grained soils that was slowly back-diffusing into the permeable zones of the SA, resulting in an approximately three-acre dissolved-phase plume in the shallow. The FFS was finalized as a remedial action plan that met the requirements of Chapter 62-780, F.A.C. The final remedy included an impermeable barrier to isolate the 1,4-dioxane source area; innovative, engineered phytotechnology using native species for COC reduction and hydraulic containment; and long-term monitoring for the dissolved plumes. The RAP was implemented and by the second growing season, results demonstrated that the phytotechnology system had captured groundwater flow through hydraulic containment, and groundwater concentrations had decreased by two orders of magnitude. Geosyntec obtained DEP approval to shut down and decommission the P&T system and implement an optimized groundwater monitoring program specific to the phytoremediation design. By the fourth growing season, Geosyntec demonstrated that 1,4-dioxane within the isolation area had decreased to concentrations slightly above the GCTL and that the other plumes were stable and/or shrinking. Based on these results, Geosyntec successfully negotiated DEP approval for no further action with conditions.
Title: Using Real-time Data Monitoring During Large Diameter Auger Drilling with Steam and Zero-Valent Iron Injection to Enhance Source Zone Mass Removal
Name: Zackary Munger, Ph.D., Hydrogeologist, Geosyntec Consultants, Titusville
Session: 5A: Young Professionals
Time: 9:45 a.m.
Date: December 8, 2017
Treatment efficiency and effectiveness are the premium attributes of aggressive remediation efforts. After developing a conceptual site model and performing a remedial alternatives evaluation for a site impacted with chlorinated volatile organic compounds, Geosyntec recommended using large diameter auger drilling with steam and zero-valent iron injection to rapidly eliminate the source zone and facilitate a transition to natural attenuation. The remedial technology involves using the auger to simultaneously mix the subsurface and introduce hot air/steam to promote thermal volatilization and stripping of CVOCs from soil and groundwater, followed by injection of ZVI as a polishing step to provide treatment of residual CVOCs. To focus the LDA/Steam/ZVI treatment in the depths and areas with the greatest CVOC mass, Geosyntec developed and implemented a treatment protocol in which the number of treatment passes, ZVI injection quantity, and the addition of step-out borings were based on real-time data, including off-gas CVOC concentrations. During the three months of LDA/Steam/ZVI implementation, 500 pounds of tetrachloroethylene were remediated with most of the recovered mass being removed from two low hydraulic conductivity layers. Approximately 370,000 pounds of ZVI were injected to treat residual CVOCs. Post-processing of the real-time data was performed to calculate the CVOC mass removed from each treatment boring and to visually present the distribution of mass recovered throughout the treatment area. Utilizing real-time data collection and an adaptive treatment protocol enabled Geosyntec to immediately respond to remediation performance and carefully focus efforts to maximize treatment efficiency and effectiveness
Title: Bioremediation Approaches and Tools for Benzene Remediation Under Anaerobic Conditions
Name: Jeff Roberts, MSc, Senior Manager, SiREM, Guelph, Ontario, Canada
Session: 5B: Petroleum Remediation: Case Studies
Time: 10:20 a.m.
Date: December 8, 2017
Benzene, toluene, ethyl benzene, xylene and other aromatic hydrocarbons typically degrade faster under aerobic conditions than anaerobic conditions. When hydrocarbon-contaminated aquifers are predominantly anaerobic, aerobic bioremediation is not always feasible and anaerobic bioremediation approaches become favorable. Biostimulation and bioaugmentation with anaerobic BTEX-degrading microorganisms may be required for effective remediation at anaerobic hydrocarbon contaminated sites. To address this need, anaerobic cultures capable of complete degradation of benzene toluene and xylene have been developed at the University of Toronto. These cultures have been characterized and key microorganisms have been identified. SiREM, the University of Toronto and Federated Cooperatives Ltd. are currently engaged in a three-year research project to advance anaerobic benzene degradation from the lab to the field, funded in part by Genome Canada and the Province of Ontario. The objectives of the project include scale-up of an anaerobic benzene culture to field volumes, demonstrating its effectiveness for bioaugmentation in treatability studies and field tests. This benzene-degrading culture is currently being assessed in microcosms constructed with materials from hydrocarbon contaminated sites. Information generated will include inoculum density requirements, degradation rates and the range of geochemical conditions required for optimal performance of the culture, and will be used to design field trials. Molecular genetic tools to quantify and track key microbes and functional genes involved in benzene degradation are also being developed. These tools will allow in-situ assessment and monitoring of enhanced bioremediation applications
Learn more at: Florida Remediation Conference 2017.
Learn more about Jim Langenbach at: https://www.geosyntec.com/people/james-langenbach
Learn more about Jim Linton at: https://www.geosyntec.com/people/james-linton
Learn more about Zackary Munger at: https://www.linkedin.com/in/zackarymunger/
Learn more about Jeff Roberts at: https://www.linkedin.com/in/jeff-roberts-209a048/