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Table 2 <br />Daytime Peak -Hour Highway Noise Modeling Noise Impact Results1 <br />Platinum Land LLC Development, Ramsey, MN <br />Receptor <br />Llo (dBA) <br />L50 (dBA) <br />R1S <br />51.0 <br />43.7 <br />R2S <br />49.1 <br />42.5 <br />R3S <br />49.0 <br />42.4 <br />R4S <br />48.3 <br />41.8 <br />R5S <br />47.5 <br />41.0 <br />R6S <br />47.9 <br />41.4 <br />R7S <br />47.4 <br />40.9 <br />' Outdoor use areas are on the south side of the proposed multi -family buildings. These areas are shielded from <br />Nowthen Boulevard traffic noise by the proposed buildings. Receptors R1S — R7S represent theses outdoor use areas <br />for each of the 7 proposed buildings. The Minnesota NAC-1 daytime noise standards are based on preventing speech <br />interference in areas for outdoor use, <br />Table 3 <br />Nighttime Peak -Hour Highway Noise Modeling Noise Impact Results <br />Platinum Land LLC Development, Ramsey, MN1 <br />Receptor <br />Llo (dBA)2 <br />L50 (dBA)2 <br />R1N <br />63.6 <br />55.6 <br />R2N <br />63.6 <br />55.6 <br />R3N <br />63.6 <br />55.7 <br />R4N <br />63.6 <br />55.7 <br />RSN <br />63.6 <br />55.6 <br />R6N <br />63.6 <br />55.6 <br />R7N <br />63.4 <br />55.3 <br />'Receptors R1N — R7N represent the areas near the north edge of each the 7 proposed buildings. The Minnesota <br />NAC-1 nighttime noise standards are based on preventing sleep interference in bedrooms with partially open <br />windows. 2Bolded numbers exceed Minnesota NAC-1 standards for nighttime hours. <br />All modeled noise levels are within the Minnesota NAC-1 standard for the peak daytime hour. <br />The modeled noise levels exceed the Minnesota NAC-1 standard for the peak nighttime hour. <br />The nighttime NAC-1 standards are designed to prevent sleep interference for people sleeping in <br />bedrooms with partially open windows. NAC-2 nighttime standards apply to NAC-1 locations if <br />the building is constructed in such a way that the exterior to interior sound level attenuation is at <br />least 30 dBA and the building has year-round climate control. Buildings meeting the State <br />building code requirements typically meet the 30 dBA exterior to interior sound level attenuation <br />requirement. <br />All modeled nighttime impacts are within the NAC-2 standards. Therefore, assuming the <br />proposed residences will have year-round climate control, the modeled impacts at the proposed <br />development are within the State noise standards and no additional mitigation is required. <br />