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Council adopts microtrenching standard updates to engineering code after freeze‑thaw concerns addressed
Summary
The council adopted amendments to Flagstaff’s Engineering Design Standards to permit microtrenching under specified conditions. Staff said the standard limits trench depth to avoid conflicts with frost‑protected utilities and requires quality backfill and sealants to limit freeze‑thaw damage.
Flagstaff City Council on Oct. 21 adopted amendments to the city’s Engineering Design Standards to incorporate microtrenching as an allowed construction technique under defined specifications, including sealant and backfill requirements and placement guidance intended to minimize freeze‑thaw damage.
Development Engineer Dave Millis presented the draft amendments and responded to questions about microtrenching performance in a cold climate. He said the city examined…
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