2025-01-22 CC Packet - (Revised 1)

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Memorandum Date: January 17, 2025 To: Honorable Mayor and City Council From: Mark Statz, PE – City Administrator/Engineer Subject: Amazon Noise Study and Escrow Background As part of the Developer’s Agreement with Amazon, an escrow of $80,000 was held in case noise from the facility became an issue and mitigation measures were necessary. The operative language from the agreement is: F. The applicant has prepared a noise study analyzing noise from the truck docks, van loading area, and other places on site where noise from facility operations is likely. The study concluded that the facility operations will not unduly disturb the expected quietude of residential areas west of the project site. At the property owner’s cost, ambient hourly noise levels in the closest residential areas to the site will be measured and analyzed by a qualified noise professional before construction of the facility begins to determine base hourly equivalent noise levels. Hourly equivalent noise levels will be measured and analyzed by a qualified noise expert after one year of operation, also at the property owner’s cost, and compared to the projected noise level goals from the noise study – 55 dBA nighttime and 60 dBA daytime – with the highest instantaneous maximum noise level being no more than 75 dB at the closest residence. If the monitoring shows levels to be at or below these levels, no mitigation will be required. An escrow will be provided in the amount of $80,000 as the Owner’s total contribution to further mitigate noise from the facility should the results of the analysis after one year show that the hourly equivalent or highest instantaneous maximum noise exceeds these levels, such mitigation measures to be reviewed and approved by the City Engineer. Noise studies shall occur during November of each applicable year. Sound level readings shall be conducted using a Type 1 Sound Level Meter, as determined by American National Standards Institute, ANSI standard S1.43. From the first Sunday in April through the third Saturday of October the nighttime hours shall be 10:00 p.m. to 7:00 a.m., and all other times of year nighttime hours shall be from 9:00 p.m. to 7:00 a.m. While the results of the noise monitoring conducted in the fall of 2024 did NOT exceed the minimumlevels set forth in the agreement, the city has received complaints from residents who can hear back-up alarms from semi-trucks arriving at the west-facing loading docks, during the overnight hours. The alarms have been loud enough to wake some residents, disturbing their sleep. 89