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Yelm planning staff previews comprehensive plan updates and outlines sewer, traffic conditions for 640 development
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Summary
Planning staff briefed council on a comprehensive plan update (planning commission recommended approval) that adds a new climate chapter and revises housing and transportation policies. Staff also described sewer plans (gravity mains and lift stations) and traffic mitigation obligations for the BlueFern/640 development, including intersection upgrades and phased requirements tied to build thresholds.
Planning staff presented the city’s comprehensive plan update and discussed infrastructure commitments tied to a large annexation and development project referred to in the session as the 640/BlueFern proposal.
The planning update consolidates updated maps and new text; staff said the planning commission voted to recommend approval to council in December. "The planning commission voted to recommend approval to the council in December," the planner said, noting maps, annexation contingencies and a brand‑new climate chapter that the staff expects will help guide development decisions.
On housing, staff described affordability categories used in state and local planning ("There's 0 to 30, which is what our Habitat project is. There's 30 to 50, 50 to 80, 80 to 100. And they actually have a 120"), and explained the difficulty of producing housing under 80% of area median income without nonprofit providers. The planner noted that military housing allowances can distort local AMI calculations and rental markets.
Staff also outlined infrastructure commitments from the 640 developer: recent meetings covered sewer capacity and lift‑station design, and staff observed that the developer is proposing gravity sewer — "so right now throughout the city of Yelm, it's all set tanks here or rare, which is pressurized main. This will be gravity, which is much more convenient for us" — with lift stations and generator backups where required. The developer will also be responsible for intersection improvements at multiple locations; staff cited several intersections and described phased timing tied to housing thresholds. As an example of developer obligations, staff said a recent decision required $950,000 for a Longmire roundabout before construction begins in a comparable project.
Staff said they expect to bring the comp plan adoption to council in about two weeks and that the developer plans to submit a conceptual plan to council shortly. If council approves the conceptual plan, staff said the developer will proceed with a master plan and phased plats.
Next steps: staff will provide the full comp plan documents, maps and the developer’s conceptual materials to council ahead of the adoption hearing planned for the next meeting cycle.

