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Enbridge Energy, LP Hoover & Keith, Inc. <br /> Waterloo Pump Station RN 3083/JN 4796 <br /> Noise Impact Analysis (10/10/14) <br /> 4.0 ACOUSTICAL ASSESSMENT <br /> The noise impact evaluation considers the noise produced by all significant sound <br /> sources associated with proposed Station that could impact the sound contribution at the <br /> Station property lines. A description of the analysis methodology and source of sound <br /> data is provided in Appendix B (p. B-3). The following sound sources are considered <br /> significant: <br /> • Noise of electric motor-driven pump units that penetrates the Pump House <br /> building. <br /> • Noise of aboveground piping (i.e., adjacent to the pumps)that penetrates the <br /> Pump House building. <br /> • Noise associated with the electrical substation (e.g., transformers, etc.). <br /> • Noise associated with the ESB Building. <br /> Tables A-D (pp. B-1 to B-2) show the calculation (i.e., spreadsheet analysis) of the <br /> estimated octave-band SPLs and the A-wt. sound level at the North, East, South and <br /> West Property Lines contributed by the significant noise sources associated with the <br /> proposed facilities for standard day propagating conditions (i.e., no wind, 60 deg. F., 70% <br /> R.H.) and any shielding from buildings, terrain or foliage has been conservatively ignored. <br /> This spreadsheet analysis includes the potential noise reduction due to the anticipated <br /> and/or recommended noise control measures for equipment. <br /> The following Table 1 depicts the estimated Station sound level contribution at the <br /> property lines and the Dane County noise requirement: <br /> Closest Property Lines Distance to Est'd Sound Dane County Compliance with <br /> Center of Pump Contribution of Property Line Dane County <br /> Building Station Requirement Requirement <br /> (dBA) (dBA) <br /> North P.L(Pos. "I'4) 300 ft. 43.4 50 Yes <br /> East P.L. (Pos. "E") 700 ft. 34.8 50 Yes <br /> South P.L. (Pos. "S") 800 ft. 34.0 50 Yes <br /> West P.L. (Pos. "W") 625 ft. 35.3 50 Yes <br /> Table 1: Sound Level Contribution of Proposed Station at Closest Property Lines <br /> and Assessment to Dane County 50 dBA Requirement <br /> In summary, the acoustical assessment indicates that if the recommended and/or <br /> anticipated noise mitigation measures are implemented, the noise attributable to the <br /> Station at property lines would comply noise requirements stipulated by Dane County for <br /> the project. <br /> -2- <br />