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<br /> <br />A 1 71.1 69.9 <5 0 <br />B 1 73 68.7 <5 0 <br />C 1 72.9 69 <5 0 <br />D 1 72.4 68.4 <5 0 <br />E 1 72.7 70.3 <5 0 <br />F 1 72.3 68.4 <5 0 <br />G 1 72.1 67.4 <5 0 <br />H 4 70.9 66.5 <5 0 <br />N 1 70.2 69.3 <5 0 <br />0 1 69.4 67.4 <5 0 <br />P 1 67.5 64.8 <5 0 <br />Q 1 66.4 63.9 <5 0 <br />R 2 64.1 61.8 <5 0 <br />S 2 69.2 66.0 <5 0 <br />T 2 61.3 60.3 <5 0 <br /> Total Attenuation 0 <br />T olal Length of Cost of 10' Barrier (@S15/sq.ft)=$510,000/0decibel reduction NA <br />Barriers :3,400 <br /> Figure 9, 10' Noise B~TTicr Feasibility Table, RL Noise Barrier 2cxt <br /> <br />A 20' noise barrier placed within the model to maximize decibel reduction at the receptors on <br />the north end of Round Lake does not meet the Mn/DOT minimum criteria of $3,250.00 per <br />residence, per decibel reduced. <br /> <br />The price per decibel reduction for a 20' barrier is $5,842. Therefore, a 20' noise barrier <br />including the south em extension is not cost effective. <br /> <br />For a 10' barrier in the same location, there is not enough attenuation provided at any of the <br />receptors to make the barrier acoustically effective. Receptors that receive less than a 5dBA <br />reduction are not included within the overall (per Mn/DOT policy]) A 10' noise barrier, <br />including the southerly extension, does not achieve enough acoustic reduction therefore is <br />considered not effective. <br /> <br />Noise Barrier Analysis <br />Highway 10 <br /> <br />Page 9 <br />