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Odor modeling, monitoring and verification emerge as central issues in Coffin Butte expansion review
Summary
County staff and third‑party consultants reviewed the applicant's odor modeling, recommended a measurable boundary standard and third‑party verification; the applicant agreed to monitoring and to third‑party review for an initial period, while opponents questioned the model inputs and public reporting.
The potential for odor from the Coffin Butte Landfill expansion was a focal point of technical testimony at the Oct. 22 Benton County hearing. Staff and independent reviewers examined the applicant’s odor dispersion modeling, proposed mitigation and conditions to make odor enforcement actionable for the county.
County staff described the approach taken by Mall Foster and other consultants to evaluate the applicant’s odor model and translate subjective smell reports into an engineering threshold. Staff said the applicant’s model predicts ‘‘a noticeable odor below 4, above 1 at the property boundary’’ on a typical day and recommended conditions that include daily odor survey points, regular boundary patrols and an independent third‑party odor verification program. The staff report proposed that an independent verification measurement at or above a 4 d/Dt (dilution to threshold) trigger require immediate mitigation steps and that the county require third‑party…
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