Appellants press for groundwater study as engineer says stormwater model meets county code
At a San Juan County hearing on OPALCO’s Decatur Island solar project, the applicant’s engineer testified that stormwater modeling (including PV‑SMART inputs and the Western Washington hydrology model) shows no increased off‑site runoff; appellants urged additional subsurface/groundwater study, citing topography and test‑pit evidence of perched groundwater.
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Tyler Stanich, a civil engineer retained by the applicant, told the San Juan County hearing examiner that the project’s drainage analysis used the Department of Ecology’s Stormwater Management Manual for Western Washington and the Western Washington hydrology model and that the site-level inputs (including geotechnical data) showed the post‑development flows would not exceed predevelopment flows.
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