Noise Report: ODOT Solar Highway Project: West Linn Site Clackamas County.
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Noise Report: ODOT Solar Highway Project: West Linn Site Clackamas County.

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      This report analyzes the potential changes in noise levels resulting from the proposed Solar Highway Project in West Linn, Oregon. The project will place solar arrays and inverters on the north side of I-205 to generate approximately 3,000,000 kilowatt-hours of renewable energy to power the Oregon transportation system. The project will place between 13,000 and 17,000 panels and ten 260 kilowatt (kW) inverters at the site. Solar inverters will be clustered at 3 separate locations with 3 to 4 inverters at each location for a total of 10 inverters. Changes to the noise environment which is dominated by the traffic noise from I-205, due to either the noise emitted from the solar inverters or as a result of on-site tree removal are analyzed in this report as part of the National Environmental Policy Act (NEPA) process. The conservative analysis determined that during the day the solar inverters will increase noise levels at residential receivers (receiver) by 2 dBA or less and that this change will not be perceptible to human ears 1 . However, in spring and summer, during the 1st hour and last two hours of daylight when traffic noise is reduced, solar inverters may increase noise levels at the closest residences by 3 dBA or less. This change is just perceptible to human ears. At night, the inverters will not emit any sound. The effects of tree removal on the project site will not cause clearly noticeable changes in noise levels (5 dBA). The trees slated for removal are not currently dense or tall enough to provide shielding for the residences located along the northern edge of the right-of-way (ROW) from I-205 traffic noise. Once the project is in place, additional noise monitoring will be conducted to determine if mitigation needs to be considered.
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