In this webinar we are pleased to have a special guest presentation by Richard Desrosiers, Associate Principal and Hydrogeologist at GZA GeoEnvironmental, Inc. In this presentation he discusses cost-effective remediation through enhanced characterization.
Webinar highlights include:
- Effective field exploration techniques outlining the use of high resolution site characterization and optimized well screen placement for improved outcomes
- Presentation of case study showcasing effective in situ treatment of hexavalent chrome and chlorinated solvents
- Complicated site featuring low permeability and high flux zones discussed
- Steps taken to closely define vertical and horizontal contaminant limits leading to a more targeted remedy
- Significant cost savings realized by employing high resolution site characterization techniques
An in situ remediation case study is presented to demonstrate how enhanced characterization techniques were used to not only define existing conditions but also to define the upper and lower boundaries of two 4,000-foot plumes. A detailed understanding of subsurface conditions, including the factors influencing migration and natural attenuation, allowed the development of a source zone mass reduction remedial design, followed by a monitored natural attenuation approach for the downgradient portions of the plumes, rather than active remediation of the entire plume. Stoichiometric doses of PersulfOx (chlorinated plume) and a solution of lactic acid and 3DMe (hexavalent chromium plume) were injected within delineated zones of low and moderate hydraulic conductivity in those high mass zones to effectively reduce contaminant mass. Injection point spacing, and dosing were based on the calculated effective zone of influence of the additive, whereas, treatment barriers were based upon field pilot studies to determine the longevity of the additive and seepage velocities. Current data shows significant plume concentration/mass reductions within the two plumes.
About the Presenter:
Richard Desrosiers
Associate Principal and Hydrogeologist, GZA GeoEnvironmental, Inc.
Richard Desrosiers is a Licensed Environmental Professional in Connecticut and a licensed Professional Geologist in New Hampshire and Tennessee. His 33-years of environmental experience have focused on understanding complex geology, hydrogeology and geochemistry associated with soil and groundwater contamination. His responsibilities have included utilizing state of the art investigation techniques including high resolution site characterization, RCRA and CERCLA hazardous waste investigations and closures; and the development of innovative in-situ technologies to remediate groundwater contamination. Mr. Desrosiers is actively involved with multiple Interstate Technology & Regulatory Council teams including “Optimization of In-Situ Remediation and Injection Strategies” and “PFAS”.