Agenda - Planning Commission - 07/10/2019

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Jeremy Larson June 26, 2019 Hampton Companies, LLCPage 5 Table 3.Traffic Noise Analysis Results (Daytime and Nighttime) Receptor ID Land Use State NAC Daytime L, Daytime L, Nighttime Nighttime 1050 dBA dBA L, dBA L, dBA 1050 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 Residential NAC-1 65 60 55 50 Standard 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 (L) and 67.1 dBA (L), above State 1050 limits for NAC-1. Modeled nighttime noise levels at this location are 71.5 dBA (L) and 66.6 dBA 10 (L), above State limits for NAC-1. 50 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 (L) and 55.7 dBA (L), below State limits for NAC-1. 1050 Modeled nighttime noise levels at this location are 58.4 dBA (L) and 55.2 dBA (L), above State 1050 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 (L) reduction in nighttime noise levels at Receptor 1-1, and is not considered 10 acoustically effective.