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<br />. <br /> <br />. <br /> <br />. <br /> <br />Noise Modeling Methodology <br /> <br />Traffic noise impacts were assessed by modeling noise levels at "sensitive" receptor sites <br />(i.e., existing and future residences) likely to be most affected by changes in traffic <br />volumes and roadway alignment resulting from construction of the proposed project. <br /> <br />Eight noise modeling receptors (R1 - R8) were selected at existing residential properties in <br />the project area to represent those sites most sensitive to potential project-related traffic <br />noise impacts (Figure ]6). Modeling was also performed for Cummings Park, which is <br />located north of the Guidant campus and is represented by R9. All receptor sites are <br />classified within the definition of State of Minnesota Noise Area Classification One <br />(NAC-]). <br /> <br />Noise modeling was done using the noise prediction program "MINNOISE," a version of <br />the FHW A noise model "STAMINA" adapted by MnlDOT and approved by the MPCA. <br />This model uses vehicle numbers, speed, class of vehicle, and the typical characteristics of <br />the roadway being analyzed, The computations for the proposed improvements were based <br />on existing and projected traffic volumes, existing and proposed traffic speeds, and vehicle <br />class percentages. Projected traffic volumes for peak daytime and nighttime hours one year <br />after completion of the full build out scenario (i,e., year 2020) were used to predict future <br />noise levels. <br /> <br />Noise Modeling Results <br /> <br />Noise modeling results for existing (2002) conditions and for the year 2020 are presented <br />in Tables 23 and 24. Both daytime and nighttime LlO and LSD are shown for the existing <br />(2002) condition and for year 2020 with the two project alternatives: No-Build and Build. <br /> <br />TABLE 23 <br />NOISE MONITORING AND MODELING RESULTS - DAYTIME <br /> <br /> Modeled Modeled 2020 Modeled 2020 <br />Receptor Monitored Existing (2002) No-Build Build <br /> LIO L5D LIO L5D LIO L5D LIO LSD <br />Rl 67 61 67 62 68 63 <br />R2 68 63 68 61 69 63 70 64 <br />R3 62 57 63 58 63 59 <br />R4 66 63 68 61 69 63 70 63 <br />R5 69 61 70 63 70 64 <br />R6 67 61 67 62 68 63 <br />R7 64 60 64 59 65 60 66 61 <br />R8 61 56 62 56 63 58 <br />R9 55 52 56 53 56 54 <br />State Standards 65 60 65 60 65 60 65 60 <br /> <br />Bold numbers arc above state standards. <br /> <br />Guidant Campus Master Plan <br />Draft AUAR <br /> <br />-50- <br /> <br />September 2002 <br />