Chevron Fellow and Sr. Consulting Hydrogeologist
Chevron Energy Technology Company
Tim Buscheck has worked in Chevron’s Health, Environment, and Safety Department since 1985. He leads Remediation R&D programs for Chevron Corporation and Chevron Environmental Management Company. He consults with Chevron Operating Companies on site assessment and remediation for marketing, chemical, refining and upstream facilities throughout the United States and internationally. Tim’s current university research collaborations include application of diagnostic tools and development of innovative methods for groundwater remediation. He has authored papers on diagnostic tools for remediation, natural attenuation, and ethanol fate and transport. He has written several protocols for Compound Specific Isotope Analysis and Monitored Natural Attenuation, used by Chevron, consultants, and regulators. He has collaborated with the US EPA and California State Water Resources Control Board, teaching regulatory classes and short courses on assessment and remediation of oxygenates and natural attenuation. He is an Associate Editor for the Groundwater Monitoring & Remediation journal. He has a M.S. in Geological Engineering from University of California, Berkeley and a B.S. in Chemical Engineering from Lafayette College. Tim is a registered Civil Engineer in California.
Diagnostic Tools for Improved Remediation Performance
To optimize the performance of remediation systems, it is important to differentiate contaminant concentration reductions caused by physical mass removal from in situ destruction, and demonstrate mechanisms of biological and/or chemical transformation. The diagnostic tools used in this research consist of a combination of stable isotope tools and biomarkers.
Diagnostic tools were evaluated in three controlled field experiments with different remediation technologies, conducted at the Borden aquifer. After validating the tools during these experiments, they were applied at two full-scale remediation sites. One site conducted soil vapor extraction and sulfate land application was conducted at the second site.
Diagnostic tools can demonstrate the effectiveness of remediation strategies. The tools can also provide strong evidence to support shutting down the remediation system and transition to Monitored Natural Attenuation earlier than planned. The tools can improve remediation decision quality, design, and performance optimization, leading to lifecycle cost reductions.
AUTHORS: Daniel Hunkeler1, Daniel Bouchard1, Neil Thomson2, Ramon Aravena2, Eugene Madsen3, Ravi Kolhatkar4, Eric Daniels4, Kammy Sra4, Violaine Ponsin1, Christopher DeRito3
1University of Neuchatel
2University of Waterloo
4Chevron Energy Technology Company