Abstract
The Skagit Hydroelectric Project comprises three dams and power plants in the North Cascades and transmission lines running from the plants to Seattle. HDR helped Seattle City Light complete numerous studies in support of relicensing of the Project. The sound study was charged with evaluating noise from all project-related activities, which include noise from the powerhouses, transmission lines, dam spill events, emergency sirens, telephone alerts, helicopter flights, boat traffic, vehicle traffic, construction equipment, and even a locomotive bell rung by visitors. Models used include Cadna-A, AEDT, and BPA's corona noise model. The sound study also included week-long measurements of existing noise at six locations during summer (peak recreation season) and spring (off-season), processed using National Park Service methods. Regular emergency siren testing allowed the model to be validated across long distances using the noise monitoring data. This presentation will discuss the varied approaches HDR's acoustics team used to synthesize all of these aspects into one award-winning sound study - this project won INCE's 2023 Nancy Timmerman Member's Choice Award.
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