CEMS Hybrid Luncheon – Finally: A Practical Guide to PFAS Sampling – April 9

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Finally: A Practical Guide to PFAS Sampling

Andy Horn, PG, Westwater Hydrology LLC

Tuesday, April 9, 2024, 11:45am-1pm

Hybrid Format – In person and virtual

CEMS has received one (1) general CLE credit for this presentation

Presentation Notes


For years the dominant paradigm in PFAS sampling has been highly restrictive with a focus on excluding any materials from the field activity that may possibly contain PFAS. A broad collection of products including makeup, sunscreen, insect repellants, field books, pens and markers, and other items that may contain PFAS have been strictly forbidden from PFAS sampling sites. This presentation will discuss recent research showing that many of these products either 1) do not contain PFAS or 2) are not plausible sources of sample bias merely because of their presence at a PFAS sampling site. Mr. Horn will draw on his experience as a contributor serving on two National Groundwater Association (NGWA) PFAS task groups, one in 2017, developing a white paper on the state of the science relevant to PFAS sampling and analysis at that time, and subsequently on the 2023 NGWA task group developing an updated white paper on PFAS sampling incorporating recent sampling interference research.

Andy Horn, PG, has been an environmental and water resource consultant for over 30 years. He has also served on an NGWA PFAS task group on risk communication for water well contractors, and has presented generally on PFAS as well as regulatory issues and the state of major PFAS litigation. He is currently a contributor to an NGWA task group developing a white paper on PFAS forensics. Andy has performed hydrogeologic investigations at hazardous waste sites and facilities including US EPA Superfund, manufacturing, fueling & maintenance, and chemical storage & distribution and for basic scientific research. Andy’s areas of expertise include data collection program design and management for environmental and water resources investigations, data analysis and synthesis, and study results reporting and presentation. Andy earned his Bachelor of Science in Geology from the University of Alabama in 1990 and his Master of Science degree from the University of Colorado, Boulder in 1997.

In Person Location:  New LocationCDPHE,  4300 Cherry Creek S Drive, Denver, CO 80246, Building B (SE Corner), room B1E (The Crayton Room), MAP with parking

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Notice: CEMS would like to thank Colorado Department of Public Health and Environment (CDPHE) for the use of meeting space and would like to emphasize that the use of CDPHE space does not constitute endorsement of CEMS, sponsors of CEMS functions, or the content of CEMS workshops or meetings.

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