7B, 10-96 Update on Position Paper

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Total Length of Barrier :870' Total Attenuation Cost of 10' Barrier (@S15/sq.ft) ~S130,500/12 decibel reduction $10,875 Figure 5, 10' Noise Barrier Feasibility Table, RL Noise Barrier I A 20' noise barrier placed within the model to maximize decibel reduction at the receptors on the north end of Round Lake does not meet the Mn/DOT minimum criteria of $3,250 per residence, per decibel reduced. The price per decibel reduction for a 20' barrier is $5,839. For a 10' barrier in the same location, the Mn/DOT minimum criterion of $3,250 is not met with a price per decibel reduction of$10,875. 3.2 Round Lake Noise Barrier 2 The second noise barrier analyzed for this report is labeled "RL Noise Barrier 2" and begins 900 feet south of the Hwy 96 and 10 intersection on the west side of 10, is 2000' long and shields 11 homes which reside on the eastem shore of Round Lake (receptors A-H). Figures 6 and 7 illustrate the complete noise impact survey including design year levels (2030), MINNOISE modeled noise figures, resulting differences and noise barrier attenuation figures for both a 20' and 10' barrier at the "RL Noise Barrier 2" location. A B C D E F G H 4 71.1 73 72.9 72.4 72.7 72.3 72.1 73.2 66.1 62.5 62.3 61.7 63.3 61.6 61 60.9 5.4 10.7 10.5 10.5 9 10.5 10.9 11.5 5.4 10.7 10.5 10.5 9 10.5 10.9 46 103.5 $5,797 Total Length of Barrier :2,000 Total Attenuation Cost of 20' Barrier (@S15/sq.ft) ~S600.000/103.5 decibel reduction Figurc 6, 20' Noisc Barrier Feasibility Table, RL Noise Barricr 2 Noise Barrier Analysis Highway 10 Page 6