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Council weighs sound-wall options for 96th Avenue; CDOT cost metrics shape staff recommendation
Summary
A consultant noise study for the planned 96th Avenue widening identified limited beneficiaries and high per-capita costs for sound walls. Staff recommended against building walls under CDOT/FHWA thresholds but council asked for targeted public outreach of beneficiaries and suggested a higher buy-in threshold.
Commerce City staff presented a noise-analysis follow-up for the 96th Avenue (E. 96th Avenue) widening project and asked council how to proceed on potential sound-wall mitigation.
The study, prepared for the city using CDOT and FHWA methodologies, modeled existing and future noise conditions for the widening project area and estimated who would “benefit” from noise mitigation. Staff cited CDOT’s metric in the analysis: “CDOT defines a beneficiary as someone who will receive at least 5 decibel reduction from noise mitigation efforts,” and said CDOT’s cost-effectiveness threshold is about $34,000 per benefited receptor.
The study considered walls on the western and eastern segments adjacent to the project and—excluding properties that face the roadway (front…
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