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Guam EPA revises Y‑15 well risk assessment; plans public comment and press release as testing regime is clarified
Summary
Guam Environmental Protection Agency staff presented proposed updates Nov. 13 to the agency’s interim action level (IAL) risk assessment for the Y‑15 well and other systems affected by PFAS, adding explicit monitoring steps after treatment is in place.
Guam Environmental Protection Agency staff presented proposed updates Nov. 13 to the agency’s interim action level (IAL) risk assessment for the Y‑15 well and other water systems affected by PFAS. The changes add specific monitoring and mitigation requirements staff say will make it clearer when treatment can be deemed effective and a public advisory could be lifted.
"We want at least four weekly samples for consecutive weekly samples to verify that the treatment that is in place is non‑detect or less than half of the interim action level," Shannon, the presenting agency staffer, told the board, explaining that weekly testing would be followed by…
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