CCP 09-30-2002 - Laserfiche WebLink

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TABLE 24 NOISE MODELING RESULTS - NIGHTTIME . Modeled Modeled 2020 Modeled 2020 Receptor Existing (2002) No-Build Build LIO Lso LIO Lso LIO Lso RI 66 60 67 61 67 61 R2 67 60 68 62 69 62 R3 61 55 62 57 62 57 R4 67 60 68 61 69 62 R5 68 60 69 62 70 62 R6 66 60 66 60 68 62 R7 63 58 64 58 65 60 R8 60 54 61 55 62 56 R9* 54 51 55 52 55 53 State 55 50 55 50 55 50 Standards Bold numbers are above state standards. * As stated previously, as there are no overnight uses within Cummings Park (represeuted by R9) nighttime noise standards do not apply. . Residential Receptors (Rl- R8) Based on projected traffic increases, daytime and nighttime noise levels will increase by up to 3 dBA over existing conditions with the No-Build or Build Alternatives. Increases in traffic noise between the 2020 No-Build and 2020 Build conditions range from 1 to 2 decibels. Noise levels at Receptors 1, 2, 4, 5 and 6 currently exceed state daytime standards and will continue to do so with both the 2020 No-Build and Build Alternatives. Noise levels at Receptor 7 are currently just below state daytime standards and will be at state daytime standards for the 2020 No-Build Alternative, and just above these standards for the 2020 Build Alternative Nighttime noise standards are currently exceeded at Receptors 1 -8, and will continue to be exceeded with the 2020 No-Build and Build Alternatives. Violation of the more stringent nighttime standards is common in developed urban and suburban areas, because the "nighttime" period is defined by the MPCA as including the 6:00 a.m, to 7:00 a.m. hour, which is the beginning of the morning rush hour. . Guidant Campus Master Plan Draft AUAR .51 - September 2002