Agenda - Council - 02/26/2019 - Laserfiche WebLink

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• Avoid nighttime activities. 3) Alternative Construction Methods: • Avoid impact pile driving where possible in sensitive areas. Drilled piles or the use of sonic vibratory drivers can reduce vibration levels. • Select demolition methods not involving impact. • Avoid vibratory rollers and packers near sensitive areas. Long-term Vibration Mitigation 1) Building Modifications: • Implement setback requirements similar to the screening distances above for different classes of buildings. • If there is no way to avoid vibration impacts to a certain building, construction methods such as the use of special foundations is possible. 2) Trenches: • The use of trenches to reduce vibration impacts is analogous to the use of sound barriers for noise abatement. 3) Operational Changes: • Use train equipment that generates the least amount of vibrations. • Reduce nighttime traffic." Summary of Environmental Impacts. There are no areas within the proposed Ramsey Town Center development that are projected to exceed the state daytime standards. However, there are four blocks along Industry Avenue (Blocks 28, 36, 37, and 38) that either already or will exceed the state nighttime NAC-1 standard of 52 dBA. The exceedances are less than 10 dBA. While these predicted noise levels are above the state nighttime standard, they are not uncommon in developed residential areas that are adjacent to busy roadways. The impacts of vibration from the railroad and roadway traffic can be minimized through a mix of commonly used mitigation measures used during construction and post - construction periods, and careful site/land use design. Mitigation Element. Noise wall mitigation would not be practical along Industry Avenue. Driveways and street intersections would create gaps in the wall, defeating its purpose. It is suggested that the proposed residential units in Blocks 28, 36, 37, and 38 be designed to minimize noise impacts. The noise around the homes and surrounding areas can be reduced by providing climate -controlled units, increasing wall insulation, and providing common areas on the side of the buildings furthest from Industry Avenue. 23/24-10