Agenda - Council - 07/23/2019 - Laserfiche WebLink

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Jeremy Larson Hampton Companies, LLC Table 3. Traffic Noise Analysis Results (Daytime and Nighttime) June 26, 2019 Page 5 Receptor ID Land Use State NAC Daytime Lio, dBA Daytime Lso, dBA Nighttime Lio, dBA Nighttime Lso, dBA 1-1 Residential NAC-1 58.8 55.7 58.4 55.2 1-2 Residential NAC-1 71.8 67.1 71.5 66.6 State Standard Residential NAC-1 65 60 55 50 Bold numbers are above State daytime and nighttime noise standards. Noise Abatement Recommendations An outdoor use area is planned on the north side of the assisted living/extended care facility on the north side of the building facing Highway 10 (Receptor 1-2). This area is expected to see limited use. Modeled daytime noise levels at this location are 71.8 dBA (Lio) and 67.1 dBA (Lso), above State limits for NAC-1. Modeled nighttime noise levels at this location are 71.5 dBA (Lio) and 66.6 dBA (Lso), above State limits for NAC-1. It is recommended to consider removing planned outdoor use areas from the north side of the assisted living/extended care building, and locate outdoor use areas on the south side of structure. Under this scenario, the building itself functions as a barrier. Noise levels were modeled on the south side of the building near the proposed entrance location (Receptor 1-1). Modeled daytime noise levels at this location are 58.8 dBA (Lio) and 55.7 dBA (L50), below State limits for NAC-1. Modeled nighttime noise levels at this location are 58.4 dBA (Lio) and 55.2 dBA (L50), above State limits for NAC-1. There is no reasonable noise abatement measure to reduce modeled noise levels on the south side of the assisted living/extended care building (Receptor 1-1) below State nighttime limits for residential uses (NAC-1). A 20-foot tall noise wall was modeled along the Highway 10 right of way adjacent to the proposed assisted living/extended care facility. The modeled wall location is illustrated in the attached figure. Table 4 tabulates the noise wall effectiveness results. The modeled noise wall results in a 0.4 dBA (Lio) reduction in nighttime noise levels at Receptor 1-1, and is not considered acoustically effective.