Laserfiche WebLink
<br /> <br />A 71.1 69.9 <5 0 <br />B 73 68.6 <5 0 <br />C 72.9 68.7 <5 0 <br />0 72.4 67.9 <5 0 <br />E 72.7 69.9 <5 0 <br />F 72.3 67.9 <5 0 <br />G 1 72.1 66.9 5.2 5.2 <br />H 4 73.2 66.2 6.6 26.4 <br /> Total Attenuation 31.6 <br />Total Length of Cost of 10' Barrier (@S15/sq.ft) =S300,000/31.6 decibel reduction 9.494 <br />Barrier :2,000 <br /> Figure 7. 10' Noise Barrier Feasibility Table, RL Noise Bamer 2 <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 $5,797, <br /> <br />For a 10' barrier in the same location, there is not enough attenuation provided at a majority <br />of the receptors to provide a cost feasibility ratio as those reductions that receive less than a <br />5dBA reduction are not included within the overall per MnlDOT policy], There are two <br />exceptions, that ofreceptor H which represents 4 residences, and receptor G which represents <br />I residence, Total decibel reduction at these receptors is 31.6dBA. <br /> <br />This reduction, divided by the cost of the barrier, results in a decibel reduction cost ratio of <br />$9.494, which does not meet the MnDOT criteria of$3,250. <br /> <br />3.3 Round Lake Noise Barrier 2 Extension <br /> <br />In and attempt to detenlline whether further shielding, in the form of a southern extension to <br />RL Noise Barrier 2, would supply additional noise attenuation to more homes south of <br />Round Lake, and thereby increase cost reasonableness, 7 more receptors, representing 10 <br />homes were added to the over-all RL Noise Ban'ier 2 analysis. This extension is an additional <br />1400' long extending to the south and ternlinates 825' before Hwy 10 merges onto 694, This <br />extension is labeled "RL Noise Barrier 2ext" and results in a combined total noise barrier <br />distance along Hwy 10 of3400', The results of 10' and 20' barriers in this configuration, and <br />including 7 new receptors (N- T) are presented here in figures 8 and 9; <br /> <br />Noise Barrier Analysis <br />Highway 10 <br /> <br />Page 7 <br />