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<br />John Stark, Community Development Director <br />City ofRoseville <br /> <br />November 17, 2006 <br />Page 2] <br /> <br />Receptor <br />1 <br />2 <br /> <br />Fairview Avenue north of County Road C2 <br />Fairview Avenue south of County Road C <br />Cleveland Avenue between County Road C2 and County Road D <br />See Figure 7: Noise Receptor Site Locations <br /> <br />o <br />~ <br /> <br />, <br /> <br />These three noise receptors represent first-row residences adjacent to Fairview Avenue and <br />Cleveland Avenue, and fall within Noise Area Classification One (NAC-I). Minnesota State <br />noise standards for NAC-I are shown in Table 7. The LlO and L5D are the noise levels in decibels <br />that are exceeded 10 and 50 percent, respectively, ofa given time interval, usually one hour. <br /> <br />Table 7 <br />Minnesota State Noise Standards <br /> <br />MPCA State Noise Standards <br />Land Use Code Daytime (7 a.m. - 10 p.m.) Nighttime (10 p.m. - 7 a.m.) <br /> dBA dBA <br />Residential NAC-l LlO of 65 Lso of60 LlO of 55 LSD of 50 <br />Commercial NAC-2 LlO of70 LSD of 65 LlO of70 LSD of 65 <br />Industrial NAC-3 LlO of80 LSD of75 LlO of80 LSD of75 <br /> <br />Traffic noise levels modeled at the three residential areas from the Year 2001 Twin Lakes <br />AUAR ranged from 68 to 70 dBAI (daytime LlO) under year 2001 conditions. Traffic increases <br />from year 2001 to year 2020 with the Twin Lakes development were reported to result in a 1 to 2 <br />dBA increase (daytime LlO). The Year 2006 Twin Lakes AUAR update includes two <br />redevelopment scenarios for the Twin Lakes area. Potential traffic noise impacts on the three <br />residential areas adjacent to the AUAR area were again reviewed consistent with the 2001 Twin <br />Lakes AUAR. <br /> <br />Predicted daytime and nighttime peak hour traffic generated noise levels were estimated using <br />the noise prediction program "MINNOISE," a version of the Federal Highway Administration <br />(FHWA) noise model "STAMINA" adapted by the Minnesota Depm1ment of Transportation <br />(Mn/DOT) and approved by the Minnesota Pollution Control Agency (MPCA). Peak hour <br />(daytime and nighttime) traffic generated noise levels were estimated for existing (year 2006) <br />and future (year 2030) conditions with the Twin Lakes redevelopment. Data input into the noise <br />models include traffic volumes, vehicle mix, and receptor locations. Posted speeds were used to <br />model all roads. <br /> <br />1 To approximate the way that an average person hears sound, an adjustment, or weighting, of the high- and low- <br />pitched sounds is made. The adjusted sound levels are stated in units of "A-weighted decibels" (dBA). <br />