Agenda Packets - 1982/07/26 - Laserfiche WebLink

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of relatively homogeneous land lisp.. The chosen receptor iocation was normally the structure or activity center nearest the roadway. The noise susceptible homogeneous land use wrens and the approximate receptor locations are shown in figure 21. The noise regulations applicable to the proposed project are those established in FlIPM 7-7-3, and the State of Minnesota in its Noise Pollution Control Regulations. Tables 17 and 19 describe the permitted noise levels under these regubitions. The existing "Oise levels 'it the receptors were determined by monitoring and/or using a highway noise prediction model. Noise monitoring was conducted at nineteen of the receptors on average weekdays between 9 A.M. and 3 P.M. Modeling of existing highway noise levels was performed for all but nine of the receptor sites. The nine sites exchtded from this modeling were considered too remote from any existing major roadway (and thus, could not be satisfactorily estimated by a highway noise prediction method). The highway noise prediction model used was the procedure described in N-0:ional Cooperative Highway Research Program Report 174 (NCIIRP Report 174) Ilighwoy Noise - A Design Guide for Prediction and Control." This procedure which has been computerized, reoresenls a revision of the previous procedures under NCIIRP Reports 117 and 144. The input parameters for this revised modeling procedure include traffic volumes, traffic speeds, and the physical characteristics of the roadway and the surrounding aren. The traffic volumes used in estimating existing highway noise levels were taken from traffic flow maps issued by the Minnesota Departtncnl of Transportation and by Ramsey County. The specific traffic conditions examined for existing conditions were the estimated 1977 Design Hourly Volumes of autos? and trucks and the corresponding operating speeds. Predictions under these traffic 7According to FIIPM 7-7-3 for automobile traffic the lesser of the Design Ilourly Volume or the manimum volume which can be handled under traffic level of service C conditions is to be used for predicting noise levels. for truck traffic the use of the Design Hourly Volume is recommended. for the proposed project the Design Ilourly Volumes of automobiles is less than the roadway capacity at traffic level of service C conditions and therefore was used in this analysis. 156 r L: L