Document yD7ydM9kGkynMp6j2oa6qkr3

Summary of Actions at WPAFB to address PFAS contamination bon mo j I^ ITM* Sierra Club v. EPA 18cv3472 NDCA T ier 10 hio * Ohio Environmental Protection Agency ED 002061 00269786-00001 Initial Response Through UCMR sampling, WPAFB detects PFOS in distribution samples collected from their drinking water system Based on info - Ohio EPA then recommended WPAFB collect samples to determine which water supply wells were impacted Air Force also decided to move up site investigation from beginning of 2017 to late spring 2016 Sierra Club v. EPA 18cv3472 NDCA Tier 10 ff Ohio Environmental Protection Agency ED 002061 00269786-00002 Legend Sierra Club v. EPA 18cv3472 NDCA Tier 10 ED 002061 00269786-00003 Initial response continued US EPA issues new health advisory- and PFOS results from entry points and another production well are above this level Ohio EPA requests WPAFB take this well offline and provide bottled water to sensitive populations When WPAFB does not comply, Ohio EPA issues Emergency Orders hio ff Ohio Environmental Protection Agency Sierra Club v. EPA 18cv3472 NDCA Tier 10 ED 002061 00269786-00004 Actions to Protect Unimpacted wells WPAFB, Ohio EPA, and US EPA developed a sentinel well network that would be sampled quarterly Three sampling rounds have been completed Surface water and sediment samples have also been collected Sierra Club v. EPA 18cv3472 NDCA Tier 10 hio * Ohio Environmental Protection Agency ED 002061 00269786-00005 IWPFB & Dayton PFS Results -Aug/Sept 2017 PFS Ground Water Results - Huffman Dam Wellfieid Legend <l Qsjskm PiXS B es - Sep 2017 (pptj O WPAFBFFASResult-/tag 2E517{pp Stasar and River Flow&s I SamplmLocsttoType OMIfaratomgW^ i f IfortaragTOsS | P fA3 (ytoHteg WeB ^ ^ 1 WPAFB Boundary - .-- J Mp ---- ,/ c -rr.:T|i i'. k| A O h io Prote`citnivoini'oAnmcerr e 15D m , : i i IIi 7 d l , :W m ::* ______pr - " \ v t w m m ar^ mmm u " j$ jm flV * X " " . ' i "w J mm mmBMtmmMmm Sierra Club v. EPA 18cv3472 NDCA Tier 10 ED 002061 00269786-00006 Next Challenges: Air Force is hesitant to begin remedial investigation to determine nature and extent Dayton has temporarily limited pumping of Huffman Dam production wells Dayton also wants the Air Force to take actions to prevent further migration of PFAS Sierra Club v. EPA 18cv3472 NDCA Tier 10 hio * Ohio Environmental Protection Agency ED 002061 00269786-00007