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Planners preview supplemental EIS for Thurston 2045; draft to be released for 30‑day comment
Summary
Planning staff told commissioners the county will publish a draft supplemental environmental impact statement for the Thurston 2045 comp plan update and invited focused review on housing, water and climate.
Planning staff told the Thurston County Planning Commission the county will issue a draft supplemental environmental impact statement (SEIS) for the Thurston 2045 comprehensive plan update and described the schedule, scope and how commissioners can engage.
Planner Anna Rodriguez said the county issued a determination of significance last year and that the SEIS will be a supplement to the environmental review completed for the 2022 Habitat Conservation Plan. The draft SEIS will be released for public review and a 30‑day comment period, staff said; a final SEIS is expected later in the year after revisions. “We will issue the draft, SEIS, next month at some point with the intention of it being stage 1 of getting more public comment,” staff said.
Staff asked commissioners where to focus their review and recommended concentrating on water, housing and climate because those topics drive the largest legal and technical impacts. Staff said the SEIS will analyze alternatives (for example, different rural‑growth distributions and housing allocations) and that the document will not be a brand‑new, full EIS because the 2022 HCP analysis covers many overlapping topics.
Water and groundwater: Commissioners asked about aquifer recharge and critical‑aquifer areas in Grand Mound. Staff said much of the county is mapped in some category of critical‑aquifer recharge; Grand Mound includes higher‑sensitivity soils and special provisions. A planning staff hydrology subconsultant will provide a focused framework to analyze water impacts tied to comp‑plan alternatives, staff said.
Public engagement and timing: Staff said the draft SEIS will be 400 pages or more and that the department will set aside time for commissioners to review the document and discuss key sections. The public comment period on the SEIS is expected to overlap with the public hearing period for the comp‑plan chapters, offering one coordinated window for feedback.
Ending: Staff asked commissioners if they wanted to dive deeply into the full SEIS or focus on targeted topics; commissioners recommended concentrating on housing, water and climate and leaving other chapters to subsequent review. Staff will circulate the draft SEIS when it is available and schedule follow‑up meetings for focused review.
