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City to adopt 2024 Surface Water Design Manual and modernize stormwater code; NPDES compliance items reported complete or in progress

3005265 · April 16, 2025
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

Staff recommended early adoption of the 2024 Surface Water Design Manual and a code update to streamline local surface‑water rules; staff also reported all agreed‑order corrective actions with March 31 deadlines were submitted and the city is on track for remaining NPDES requirements.

City staff presented an introduction to the state’s Surface Water Design Manual and recommended the council adopt the 2024 manual earlier than the regulatory deadline so development rules remain consistent for incoming projects. Staff also outlined a code‑update plan to modernize Mill Creek’s surface water code and reactivate a surface water permit process for smaller projects.

Mr. Carmody (staff) explained the manual’s policy and technical history: the manual implements federal and state stormwater requirements (NPDES/Phase II permit), contains five technical volumes, and reflects an evolution from combined sewers and single‑event detention to continuous‑time…

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