Wednesday, september 20, 2017

Perfluoroalkyl Substance Sampling and Analysis Considerations

12:00 - 12:15 pm Social gathering

12:15 pm Presentation

This presentation has been approved for One Hour of Continuing Education Credit by the
Colorado Board of Examiners of Water Well and Pump Installation Contractors

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Geotech Environmental Equipment, Inc.

2650 E. 40th Avenue

Denver, CO 80205



Perfluoroalkyl Substances (PFAS) are a large family of synthetic chemicals used in a wide variety of products including fire-fighting foams, food packaging, and non-stick coatings. These compounds are also present in standard environmental sampling materials such as Teflon™  tubing and pump parts or other common items such as food wrappers, personal care products, or water resistant clothing. In May 2016 the U.S. EPA Health Advisory Levels were lowered to 70 ng/L (parts-per-trillion) and some states have set much lower limits for allowable drinking water concentrations. Analysis to sub-part-per-trillion levels is commonly required. The concentrations at which PFAS must be analyzed and the ubiquity of these compounds in common products require special precautions be taken to ensure, and demonstrate, that samples are not biased during collection, transport, and analysis. Current state of the practice sampling and analysis considerations will be described in this presentation.


Andy Horn has been an environmental and water resource consultant for over 25 years and is on the National Groundwater Association Best Suggested Practices Task Group developing a guidance document series on PFAS. 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, data analysis and synthesis, and study results reporting and presentation. Andy has worked on a variety of projects across the U.S. He earned his Bachelor of Science in Geology from the University of Alabama and his Master of Science degree from the University of Colorado. Andy is a Kansas registered professional geologist.