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Arden Hills 55+ Senior Housing Complex Traffic Noise Assessment David Braslau Associates, Inc. Page 16 3.3. Compliance with State Noise Standards The L10 metric is used here to evaluate compliance since standard exceedances for the L50 metric are essentially the same within several dBA. Table 3.2 shows exceedances at all receptor sites relative to the “nighttime” (am) standards in the 6-7 am hour but only two exceedances for R9 and R11 relative to the daytime standards. The daytime exceedance could be considered with modeling error. Table 3.2 Predicted L10 Noise Levels (dBA) re AM and PM Standards Rec L10 AM L10 PM re am55 re pm 65 R1 61 62 6 -3 R2 61 62 6 -3 R3 64 65 9 0 R4 62 63 7 -3 R5 62 63 7 -2 R6 63 64 8 -1 R7 57 58 2 -7 R8 58 59 3 -6 R9 68 69 13 4 R10 61 62 6 -3 R11 65 66 10 1 To comply with Minnesota “nighttime” state noise standards, exceptions to the rules under Subpart 3 of Minnesota Rule 7030.0050 must be met. Under exceptions contained in Minnesota Rules, commercial noise standards (NAC-2) can be applied to residential land use if the exceptions to the rules can be met. The applicable provisions of Minnesota Rule 7030.0050 are presented below. Subp. 3. Exceptions. The noise area classification for land use may be changed in the following ways if the applicable conditions are met. B. The standards for a building in a noise area classification 2 shall be applied to a building in a noise area classification 1 if the following conditions are met: (1) the building is constructed in such a way that the exterior to interior sound level attenuation is at least 30 dB(A) (2) the building has year-round climate control; and (3) the building has no areas or accommodations that are intended for outdoor activities. Three representative living unit plans that have extensive glazing and exposure to traffic noise have been selected for analysis. These are shown in Figure 3.6 below.