Ex. F <br />2) Intake Air Noise <br />No change was made in the equipment that quiets the fresh air intake of the generator room yet <br />substantial changes are found within the noise prediction calculation. No accounting or narrative <br />describes the rational for the changes. <br />Despite dramatic changes in the calculation, the net effect for the predicted noise level at the westerly <br />property remained the same, 38 dBA. And the predicted noise level at the southern property was <br />reduced by 1 dB, from 44 dB to 43 dBA. The changes are noted below. <br />To the West: Noise Control attenuation is lessened from -17 to -10 dBA <br /> Building Factor attenuation is raised from -15 to -22, <br />Resulting noise impact remains the same at 38 dBA. <br />To the South: Noise Control attenuation is lessened from -17 to -10 dBA <br />Building Factor attenuation of -10 dBA is replaced by-7 dBA <br /> Resulting noise impact increases from 34 dBA (errata 43) to 44 dBA <br />Noise Control attenuation quiets noise by adding a muffler, noise louvers or lined hood. <br />Building Factor attenuation quiets noise by adding sound panels in the room where the noise is created <br />or by blocking the path of the noise with a building or fence <br />The Noise Control is corrected by removing -7 dB attenuation that is actually a Building Factor <br />attenuation, due to the addition of sound absorbing panels inside the generator room, which is a Building <br />Factor attenuation. Accordingly, the Building Factor attenuation is raised by an additional -7 dBA for <br />both the west and southern properties. <br />3) Air Discharge Noise <br />There was a change in the equipment associated with noise control of the air discharge. An acoustic <br />lined hood was added outside, covering the air discharge opening which further attenuates the air <br />discharge noise. The acoustic lined hood was assigned an attenuation rating of -10 dB in the previous <br />report and continues to assign it a -10 dBA rating in the present report. <br />Additionally the above noted adjustment that backs -7 dBA out of Noise Control attenuation and adds it <br />back into the Building Factor attenuation applies here as well. This is how SSA presents the readjusted <br />Air Discharge noise calculation. <br />To the West: Noise Control attenuation is raised from -17 to -27 dBA <br /> Building Factor attenuation remains the same at -15 dBA <br /> Resulting noise impact is reduced by -10 dBA, to 28 dBA <br />To the South: Noise Control attenuation is raised from -17 to -27 dBA <br /> Building Factor remains the same at 0 dBA <br />Resulting noise impact is reduced from 44 dBA to 34 dBA <br />2 <br />