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

Home

Jeremy Larson Hampton Companies, LLC June 26, 2019 Page 4 The daytime hour of analysis was the morning rush hour (7:00 a.m. to 8:00 a.m.). The nighttime hour of analysis was 6:00 a.m. to 7:00 a.m., just prior to the start of the morning rush hour period. The modeled speed on Highway 10 was 60 miles per hour (MPH). The vehicle mix was 98 percent passenger vehicles and 2 percent heavy commercial vehicles on eastbound Highway 10, and 94 percent passenger vehicles and 6 percent heavy commercial vehicles on westbound Highway 10. Noise Analysis Results Existing Noise Levels Existing noise levels were measured at the site during the daytime and nighttime on May 30, 2019. Table 2 summarizes field measurement results. Existing noise levels exceed State daytime and nighttime standards for residential uses (NAC-1). For residential uses, the State limits are 65 dBA (L1o) and 60 dBA (L50) during the daytime, and 55 dBA (L1o) and 50 dBA (L50) during the nighttime. Table 2. Field Measurement Summary Table Daytime Nighttime Measurement Start Time Measurement End Time •• . 7:00 a.m. Modeled Noise Levels 8:00 a.m. Measured Level, Lio, dBA 69.23 66.11 Measured Level, Lso, dBA 66.23 63.08 Noise levels were assessed by modeling traffic noise at receptors representing proposed outdoor use areas at the assisted living/extended care facility. One receptor was placed on the north side of the assisted living/extended care facility building representing a proposed outdoor use area, and one receptor was placed on the south side of the building adjacent to the entrance. A figure illustrating the modeled receptor locations is attached. Table 3 tabulates the traffic noise modeling results during the daytime and nighttime. Modeled traffic noise levels at the assisted living/extended care facility on the south side of the building (Receptor 1-1) are below State daytime standards (L10 and L50) for NAC-1, but above State nighttime standards (L10 and L50) for NAC-1. Modeled traffic noise levels at the assisted living/extended care facility on the north side of the building facing Highway 10 (Receptor 1-2) exceed State daytime and nighttime standards (L10 and L50) for NAC-1.