south of the equipment rooms. It is too small and too far away to reduce noise from <br />multiple sources to the south by 10dB. <br /> <br /> <br />subject property or any noise to the north. <br /> <br /> The reflection from the wall <br />doubles sound power projected to the east, south, and west. <br /> <br />The octave analysis reveals the noise model underestimates generator noise impact by 10 <br />dBA because the dBA noise level is controlled by noise in the low frequency range, not <br />the mid-range as the applicant assumed. <br /> <br />The effects of barriers are overestimated. Octave analysis reveals low frequency, not <br />mid-range noise defines dBA level. Noise barriers are weaker for low frequency. <br /> <br />The octave analysis of generator exhaust/muffler reveals that the noise model <br />underestimates noise by 3 dBA. <br /> <br />generator exhaust noise model, which underestimates exhaust noise by an additional 6 <br />dBA. <br /> <br />The combination of generator and air condition noise is predicted to deliver <br />neighborhood noise levels between 53 and 62 dBA, far in excess of the city and state <br />noise standards. <br /> <br />-on back scatters sound around <br />the SW corner of the addition, decreasing the -15 sound barrier effect and increasing the <br />noise level at the west property corner. <br /> <br />Unless a formal variance is granted, EC 6.750(b) is violated. <br /> <br />The noise model fails to demonstrate the noise impact of collocated equipment. <br />The applicant has, therefore, failed to satisfy the requirements of city code and administrative <br />rule. <br />Therefore, the application must be denied on noise impacts alone. <br /> <br /> <br /> <br /> <br />8 <br /> <br />