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Engineers tell Cumberland council Vining Way crossing meets design but raise maintenance, compaction follow‑up
Summary
Peer‑review engineer Dan Diffin and design engineer Tom Perkins told the council the 75‑foot StreamSmart crossing and 8‑foot culvert were installed per plan, that top‑of‑subbase compaction tested at 95%, and that guardrail settlement observed in 2021 was localized and repaired; the town asked for deeper compaction records and example sites and will revisit the item on Jan. 12, 2026.
Town Manager Matt convened a workshop before the Dec. 8 regular meeting to give councilors a technical briefing on the Vining (Bynings) Way crossing and the construction observations from peer‑review engineer Dan Diffin and design engineer Tom Perkins.
Diffin said the crossing was constrained by an Army Corps StreamSmart requirement limiting the installed culvert length to 75 feet and that the installed 8‑foot culvert was sized per the StreamSmart full‑width bank rules. He described standard erosion‑control measures — geotextile fabric, Type D gravel bedding and riprap on the 1:1 slopes — and said the project had been observed during installation in November 2019.
On compaction, Diffin said…
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