Guam EPA says US EPA/ATSDR involvement expanding as soil and groundwater contamination investigation continues
Get AI-powered insights, summaries, and transcripts
Sign Up Free
Summary
Agency staff told the board that US EPA Region Marianas and ATSDR are coordinating on a scoping assessment and requested additional historical exposure data; an expert told the board consistent concentrations across years suggest a possible point source and further sampling is needed.
The Guam Environmental Protection Agency told its board on Feb. 19 that federal partners are increasingly involved in an environmental investigation after staff provided data indicating persistent concentrations of a pesticide‑class contaminant in soil and groundwater.
Agency staff said US EPA Region Marianas will conduct an initial scoping assessment (not a final sampling plan) and that some sampling may take place on federal property outside Andersen’s back gate near a site referred to as Y‑15. The agency also said the Agency for Toxic Substances and Disease Registry (ATSDR) requested additional historical exposure data, including drinking‑water, crop and fish‑consumption information, to evaluate potential public‑health risks.
A technical consultant or staff scientist briefed the board on persistence and pathways, explaining that breakdown times vary by temperature and soil conditions; in some temperate conditions half‑life may be years, while warmer tropical conditions may show faster breakdown. The scientist said the available local data show unusually consistent concentrations over many years and added, “My gut says there’s a point source somewhere,” emphasizing the need for targeted sampling and data rather than conjecture.
Why it matters: Persistent contamination that does not decline over time may indicate ongoing sources or legacy deposits that continue to affect soil and groundwater; federal involvement adds sampling and technical resources but also involves additional permitting and coordination steps.
What the board directed and next steps: Staff said a scoping assessment from US EPA is expected and the agency aims to have more data in the “relatively near future,” with a further update to the board in March. ATSDR’s request for additional exposure data has been transmitted to staff, who are assembling and providing historical drinking‑water, crop and fish consumption records for review.
Quotes from the meeting
“My gut says there’s a point source somewhere.” — Speaker 4, technical briefing to the board.
“They have also sent me the closeout report for the housing units 1 through 3… so we should have some data, hopefully, in the relatively near future.” — Speaker 4, on cooperation with US EPA Region Marianas.
Ending
Agency staff said they will continue to supply requested historical exposure data to ATSDR and coordinate with US EPA Region Marianas on scoping sampling; the board expects an update at its March meeting.