Minnesota Pollution Control Agency
David Scheer has worked for the Minnesota Pollution Control Agency in St. Paul, Minnesota, since 1987. He is a Senior Hydrogeologist in the Superfund program specializing in characterization and remediation of complex sites including chlorinated solvent and coal tar sites in fractured rock. David began his career at the MPCA in the Petroleum Remediation program where he authored, and co-authored several guidance documents. He also worked in the Site Assessment program where he gained extensive field experience before moving into the Superfund program. David has contributed to the ITRC as a team member for the Use and Measurement of Mass Flux and Mass Discharge, Integrated DNAPL Site Strategy and Integrated DNAPL Site Characterization teams. Currently David is co-team leader for the Characterization and Remediation in Fractured Rock team. David earned a bachelor's degree in Geology from St. Cloud State University in St. Cloud, Minnesota in 1986 and he is a licensed Professional Geologist with the State of Minnesota.
Characterization and Remediation of Fractured Rock
The Commerce Street Plume Superfund Site is contaminated with TCE and degradation products. After decades of contaminated site characterization and remediation, our understanding of the distribution, fate, and transport of contamination, and remedial technologies have improved such that many sites are reaching remedial objectives. Many of the remaining sites that require remediation are more challenging with contamination is present in fractured and weathered bedrock. To help meet these challenges, the ITRC has created a Technical and Regulatory Guidance document on Characterization and Remediation of Fractured Bedrock, which was published in December 2017.
While ITRC is currently offering free two-hour webinars that summarize this newest ITRC guidance document, the proposed workshop will provide a more in-depth analysis of the guidance in an interactive classroom format. At its core, the ITRC fractured rock guidance document and this workshop will cover the fundamental differences between characterization and remediation at fractured rock sites versus unconsolidated sites. The workshop will discuss basic site characteristics such as geology/rock type, flow of groundwater in the rock matrix and in fractures, and fate and transport of contaminants, including the potential impact of matrix diffusion. In addition, the workshop will discuss planning and design of characterization programs, selection of appropriate tools (including an interactive demonstration of a tools matrix), and will provide a primer regarding remedy selection, design, implementation, and monitoring. Finally, case studies will be presented to illustrate the concepts presented in each section of the workshop.
Following presentation of these topics, this workshop will discuss how the ITRC fractured rock document incorporates principles from the 2015 ITRC Integrated Site Characterization document and also how the ITRC 2011 Integrated DNAPL Site Strategy can be used at fractured rock sites Overall, this workshop will show attendees how to use these ITRC resources to develop a fully integrated site strategy and apply robust decision making to improve characterization and remedy implementation at fractured rock sites.