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Mountlake Terrace staff pitch Engineering Development Manual updates, including ADU stormwater rule and narrower local street widths
Summary
City staff presented proposed municipal code updates and a revised Engineering Development Manual to consolidate standards, define ADUs as half an ERU for stormwater billing, tighten stormwater evaluation to a three‑year lookback, and reduce local street curb-to-curb widths.
Lucas Crott, civil engineer with the City of Mountlake Terrace, presented proposed updates to the municipal code and the Engineering Development Manual (EDM), saying the changes are intended to consolidate scattered engineering standards and remove conflicting code language.
Key proposals include codifying accessory dwelling units (ADUs) as half an equivalent residential unit (0.5 ERU) for stormwater billing and capital facility charges; carving out small exceptions to avoid requiring a permit for minor landscape…
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