Charles Schaefer

Charles Schaefer

28 articles
United States CDM Smith

Biography

Dr. Charles Schaefer is the Director of CDM Smith’s Research & Testing Laboratory in Bellevue, WA. He received his PhD in chemical & biochemical engineering from Rutgers University, and has over 25 years of experience in the fate, transport, and treatment of organic contaminants in groundwater, soil, wastewater, and biosolids. Dr. Schaefer has served as a principal or co-principal investigator for several research projects, and has served as the technical lead on several site investigation and remediation efforts.

Publications by Year

Refine Results

Filter Keywords and Select Fields

Search

Sessions

All Sessions

Conference

All Conferences

Session Types

No matches
All Sessions
Reset all filters
Showing 25 of 28
Removal of Per- and Polyfluoroalkyl Substances from Wastewater via Aerosol Capture
Dung Nguyen CDM Smith
Charles Schaefer CDM Smith
John Stults CDM Smith
I1.: Ex Situ PFAS Water Treatment Technologies (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Column Testing to Assess PFAS Removal Using Various Treatment Media: Lessons Learned and Practical Engineering Considerations
Dung Nguyen CDM Smith
Charles Schaefer CDM Smith
I1.: Ex Situ PFAS Water Treatment Technologies (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Nanofiltration Followed by Electrical Discharge Plasma for PFAS Destruction in Groundwater
Stephen Richardson GSI Environmental Inc
Poonam Kulkarni GSI Environmental Inc.
Whitney Bailey GSI Environmental
Selma Mededovic Clarkson University
+5 more
Attachment
I1.: Ex Situ PFAS Water Treatment Technologies (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Lysimeters to Evaluate PFAS Leaching at AFFF-Impacted Sites
Charles Schaefer CDM Smith
Shilai Hao Colorado School of Mines
Nicholas Gonda Colorado School of Mines
Chuhui Zhang Colorado School of Mines
+5 more
I3.: PFAS Fate and Transport (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Practical Applications of Lysimeters within a Regulatory Framework and Lessons Learned
Kristen Hasbrouck Tanaq Environmental LLC
Charles Schaefer CDM Smith
Attachment
I3.: PFAS Fate and Transport (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Naturally-Occurring Abiotic Dechlorination in Clay
Charles Schaefer CDM Smith
Duncan Shih University of Texas
Danielle Tran CDM Smith
Zijie Zheng University of Texas
+1 more
H4.: Abiotic and In Situ Biogeochemical Processes: Applications and Lessons Learned (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Recent Advancements in Mechanistic Understandings of PFAS Fate and Transport in the Vadose Zone
John Stults CDM Smith
Charles Schaefer CDM Smith
Tamzen Macbeth CDM Smith
Christopher Higgins Colorado School of Mines
+2 more
Attachment
I4.: PFAS Fate and Transport Properties (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Field Validation of a Modified HYDRUS Model for Simulating PFAS Leaching in the Vadose Zone
Jeff Silva Arclight Research & Consulting, LLC
Mitch Olson Trihydro Corporation
Fritz Krembs Trihydro Corporation
Jiri Simunek c Department of Environmental Sciences, University of California
+2 more
Attachment
I4.: PFAS Fate and Transport Properties (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Bench-Scale Testing of a Novel Soil PFAS Treatment Train for Informed Remedial Planning and Decision-Making
Heather Lanza CDM Smith
Dung Nguyen CDM Smith
Charles Schaefer CDM Smith
Jeffrey Bamer CDM Smith
+1 more
Attachment
I9.: Ex Situ PFAS Treatment: Soils/Solids and Other Waste Streams (Platform)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
(Group 2, Poster Board #87) Exploring Biostimulation of (ital)Acidimicrobium sp. Strain A6 in Selected PFAS-Impacted Sediments for PFAS Degradation
Peter Jaffe Princeton University
Shan Huang Princeton University
Matthew Sima Princeton University
Jinhee Park Princeton University
+2 more
E7. PFAS and Bugs: The Search Continues (Poster) Poster
E7.: PFAS and Bugs: The Search Continues (Poster)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
(Group 2, Poster Board #238) Validation of a Cell-Based Screening Model for Assessing PFAS Mass Flux from the Vadose Zone to Groundwater
John Stults CDM Smith
Charles Schaefer CDM Smith
Tamzen Macbeth CDM Smith
Dung Nguyen CDM Smith
I4. PFAS Fate and Transport Properties (Poster) Poster
I4.: PFAS Fate and Transport Properties (Poster)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
(Group 1, Poster Board #182) Passive In Situ PFAS Immobilization and Removal Using a Novel Funnel and Gate System
David Lippincott APTIM
Paul Hatzinger APTIM
Graig Lavorgna APTIM
Sara Foxwell APTIM
+3 more
E2. In Situ PFAS Treatment Approaches (Poster) Poster
E2.: In Situ PFAS Treatment Approaches (Poster)
13th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Passive In Situ PFAS Capture and Removal Using a Novel Funnel and Gate System
David Lippincott APTIM
Graig Lavorgna APTIM
Sara Foxwell APTIM
Brett Caron APTIM
+2 more
A1. Innovative Treatment Technologies for PFAS In Situ (Platforms) Platform Attachment
A1.: Innovative Treatment Technologies for PFAS In Situ (Platforms)
2025 Bioremediation Symposium
Managing PFAS Discharges from Wastewater Treatment Plants
Charles Schaefer CDM Smith
Dung Nguyen CDM Smith
Eden Novak CDM Smith
A2. Managing PFAS in Biosolids: Exploring Detection, Fate, and Bioremediation Potential in Wastewater Treatment Plants (Platforms) Platform Attachment
A2.: Managing PFAS in Biosolids: Exploring Detection, Fate, and Bioremediation Potential in Wastewater Treatment Plants (Platforms)
2025 Bioremediation Symposium
Bench-Scale Testing Colloidal Activated Carbon (CAC) Amendments for PFAS Immobilization under Realistic Site Conditions
John Stults CDM Smith
Charles Schaefer CDM Smith
Bridget Ulrich NRRI, University of Minnesota Duluth
Elizabeth Ziegelmeyer CDM Smith
+1 more
A4. Activated Carbon-Based PFAS Treatment Technologies (Platforms) Platform Attachment
A4.: Activated Carbon-Based PFAS Treatment Technologies (Platforms)
2025 Bioremediation Symposium
(Group 1, Poster Board #63) Mechanisms Controlling PFAS Leaching at AFFF-Impacted Sites
Charles Schaefer CDM Smith
Conrad Pritchard Colorado School of Mines
Shilai Hao Colorado School of Mines
Chuhui Zhang Colorado School of Mines
+3 more
C3. Emerging Contaminants: Detection, Degradation, Fate and Transport (Posters) Poster
C3.: Emerging Contaminants: Detection, Degradation, Fate and Transport (Posters)
2025 Bioremediation Symposium
(Group 2, Poster Board #55) High-Permeability Zone Volume Fraction and First-Order Rate Constant Effects on 1,4-Dioxane Degradation in Simulated Aquifer-Aquitard Systems
Juan Jose Romero Conde Clemson University
David Freedman Clemson University
Paul Hatzinger APTIM
Charles Schaefer CDM Smith
D5. Bioremediation Approaches for the Innovative Management of Large or Dilute Plumes (Posters) Poster
D5.: Bioremediation Approaches for the Innovative Management of Large or Dilute Plumes (Posters)
2025 Bioremediation Symposium
Panel Discussion: Navigating PFAS in Biosolids: Treatment, Fate, and End-Use Decisions
Mahsa Modiri EA Engineering, Science, and Technology
Marc Mills US EPA ORD
Charles Schaefer CDM Smith
Linda Lee Purdue University
+3 more
Panel Discussion Attachment
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Field Validation of No-Purge Sampling Methodologies for PFAS
Heather Lanza CDM Smith
Jeff McDonough CDM Smith
Andrew Jackson Texas Tech University
Maxwell Hire CDM Smith
+1 more
A4. PFAS: Sampling and Analytical Methods Challenges in Different Environmental Matrices (Platforms) Platform Attachment
A4.: PFAS: Sampling and Analytical Methods Challenges in Different Environmental Matrices (Platforms)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Characterizing PFAS in AFFF-Impacted Soil and Groundwater: Assessment of Tools and Fluorine Mass Balances
Nicholas Gonda CDM Smith
Jack Elsey CDM Smith
Chuhui Zhang Colorado School of Mines
Sara Jones Colorado School of Mines
+4 more
A4. PFAS: Sampling and Analytical Methods Challenges in Different Environmental Matrices (Platforms) Platform Attachment
A4.: PFAS: Sampling and Analytical Methods Challenges in Different Environmental Matrices (Platforms)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Field Measurement of PFAS Leaching at a Long-Term Land-Applied Biosolids Site
Maxwell Hire CDM Smith
Charles Schaefer CDM Smith
Linda Lee Purdue University
Jamie Klamerus Nutrien
+1 more
A5. PFAS Fate and Transport at Contaminated Sites (Platforms) Platform Attachment
A5.: PFAS Fate and Transport at Contaminated Sites (Platforms)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Long-Term PFAS Rebound in the Vadose Zone following In Situ Flushing
Charles Schaefer CDM Smith
Shilai Hao Colorado School of Mines
Conrad Pritchard Colorado School of Mines
Chuhui Zhang Colorado School of Mines
+3 more
C2. PFAS Fate and Transport Properties (Platforms) Platform Attachment
C2.: PFAS Fate and Transport Properties (Platforms)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
Understanding the Scale and Potential Contributions of Background PFAS in the Environment
David Adamson GSI Environmental Inc.
Jeff Gamlin GSI Environmental Inc
Yukun Jin GSI Environmental Inc.
Wynne Casteel GSI Environmental Inc.
+2 more
C5. PFAS Forensic and Background Evaluations (Platforms) Platform Attachment
C5.: PFAS Forensic and Background Evaluations (Platforms)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
(Group 1, Poster Board #63) Opportunities for PFAS-Enrichment and Removal in Water Resource Recovery Facilities
Heather Lanza CDM Smith
Charles Schaefer CDM Smith
B3. Ex Situ PFAS Treatment: Soils/Solids and Other Waste Streams (Posters) Poster
B3.: Ex Situ PFAS Treatment: Soils/Solids and Other Waste Streams (Posters)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds
(Group 2, Poster Board #14) PFAS Removal via Foam Fractionation in a Groundwater Treatment Train
Evelyn Lundeen CDM Smith
Charles Schaefer CDM Smith
John Stults CDM Smith
Christopher Bellona Colorado School of Mines
+2 more
B7. Ex Situ PFAS Water Treatment Technologies (Posters) Poster
B7.: Ex Situ PFAS Water Treatment Technologies (Posters)
14th International Conference on Remediation of Chlorinated and Recalcitrant Compounds