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Expert: revised biological evaluation and noise mitigations sharply reduce pile‑driving risk to fish
Summary
The city's biological evaluator testified that at the request of the Army Corps and National Marine Fisheries the Biological Evaluation (Ex. 12) will be revised to remove upland analyses and reflect noise‑attenuation measures (timber block, bubble curtains) that shrink modeled injury and disturbance zones for pile driving.
Mister Callow, the city's testifying biologist, told the hearing that federal and state agencies asked the city to narrow the Biological Evaluation (Exhibit 12) to work below the ordinary high water mark and to reassess potential harms from pile driving. He said National Marine Fisheries and the Army Corps asked that the BE remove references to upland work and clarify why impact pile driving might cause injury or mortality to listed fish.
Callow said the project will drive piles with a vibratory hammer and then proof them with an impact hammer; the Washington Department of Fish and Wildlife…
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