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Air Force response to PFOS/PFOA:

Learn about PFOS and PFOA, the Air Force's response, identification, prevention, and ongoing actions at Davis-Monthan AFB. Find base-specific information and get your questions answered.

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Air Force response to PFOS/PFOA:

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  1. Air Force response to PFOS/PFOA: Davis-Monthan AFB 26 Jul 2019

  2. Agenda What are PFOS and PFOA? • Background CERCLA Air Force Response • Identify • Respond • Prevent Base-specific info Questions?

  3. What are PFOS and PFOA? • AFFF is widely used to extinguish petroleum fires at civilian and military airports across the U.S. The Air Force began using AFFF in 1970. • In 2009, the Environmental Protection Agency issued provisional health advisories for PFOS and PFOA, followed by a lifetime HA in 2016 of 70 parts per trillion (ppt) for PFOS and/or PFOA in drinking water. The LHA applies only to drinking water for humans.. • PFOS/PFOA are classified as emerging contaminants because:  They have reasonable pathways to reach drinking water sources.  They present a potential unacceptable risk to human health.  Regulatory standards are evolving.

  4. What are PFOS and PFOA?Background The Air Force is taking aggressive measures to reduce the risk of mission-related PFOS/PFOA contamination to drinking-water sources. In June 2009, DoD established policy and assigned responsibilities for the identification, assessment and risk management of emerging contaminants. In 2010, AFCEC began a comprehensive assessment that determined AFFF may have been released at the following locations:

  5. CERCLA The CERCLA process: • Ensures thorough investigation work • Promotes accountability, community involvement and long-term protectiveness

  6. Air Force Response The Air Force is using a three-step approach to assess the potential for PFOS/PFOA contamination of drinking water and respond appropriately.

  7. Air Force ResponseIdentify

  8. Air Force ResponseRespond • Criteria developed IAW SAF/IEE policy • Confirmation of PFOS/PFOA above US EPA’s Lifetime Health Advisory (LHA) • Probablility that AF mission is a source of PFOS/PFOA contamination • Proximity of AF contaminant area(s) above the LHA to drinking water sources • Pathway to exposure exists between contaminant source and receptor(s)

  9. Air Force ResponsePrevent

  10. Air Force Response The safety and health of our Airmen, their families, and our community partners are our priority: We are members of the communities where we serve. We share concerns about potential PFOS/PFOA contamination of drinking water and we are moving aggressively to protect human drinking water supplies connected to and affected by our installations. PFOS/PFOA contamination of drinking water is an urgent national issue requiring a whole of government response to evaluate and determine solutions for health effects and concerns about food safety and agricultural commodities. The Air Force is proud to be a leader in the response to PFOS/PFOA, and we will continue to work with our neighbors, regulators and elected officials to comply with environmental protection law and protect human health and our environment.

  11. Air Force Response Action Update

  12. PUBLIC WORKS WORKING GROUP Aqueous Film-Forming Foam and Associated Compounds Christopher Brewster, PE – Chief, Environmental Compliance DMAFB

  13. Aqueous Film-Forming Foam and Associated Compounds Initial Site Investigation (SI) at DMAFB for Perfluorinated Compounds • SI Report released by Air Force Civil Engineer Center (AFCEC) in March 2019 • No groundwater contamination within installation. Surface soil concentrations exceeded Regional Screening Level (RSL), based on residential exposure scenario of 0.126 ppm, at the fire training area. Subsurface soil (>1’) was non-detect. • Recommended installation of additional monitoring wells within NW installation boundary

  14. DMAFB, AFCEC, Tucson Water, and AZ DEQ continue to work together on developing an investigation strategy for our community • Two additional monitoring wells have been installed within the 100 Acre Wood Bike Park which is just up-gradient from TW well locations. Samples were taken and the Expanded SI Report was released by AFCEC in late July 2019. • PFOS, PFOA and PFOS+PFOA were detected in vertical aquifer samples (VAS) at concentrations exceeding the USEPA lifetime health advisory (HA) values and PFBS was detected at concentrations below the USEPA Tap Water RSL at AFFF Release Area 3. Maximum concentrations were identified at the groundwater interface at approximately 296 feet bgs with concentrations decreasing with depth. PFOS/PFOA were not detected within the screened intervals of the installed monitoring wells during subsequent groundwater sampling. • DM is working with AFCEC on determining what additional studies/surveys are to be done next. • The Air Force is also spending $500K to perform a groundwater hydrogeology survey of the installation. • Public reports are available through http://afcec.publicadmin-record.us.af.mil/

  15. Questions?

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