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Residential-Grade Mechanical Equipment <br />Receptor:Noise Level Calculation Prior to Implementation of Noise Attenuation Requirements <br />No.Equipment Description Lmax Lmax Leq <br />1 Residential grade mechanical ventilation equipment 70 1 80 160 1 0 35.5 17.2 52.734375 <br />2 Residential grade mechanical ventilation equipment 70 1 80 275 1 0 30.8 10.2 10.38617581 <br />3 <br />4 <br />5 <br />6 <br />7 <br />8 <br />9 <br />10 <br />Notes:Leq 18 <br />[1] Percentage of time activity occurs each hour <br />[2] Soft ground terrain between project site and receptor. <br />[3] Shielding due to structural/soundwall shielding <br />Ground <br />Effect[2] <br />Shielding <br />(dBA)[3] <br />Calculated (dBA) <br />Energy <br />Nearest Residential Receptor <br />Reference <br />(dBA) 3 ft <br />Quantity <br />Usage <br />factor[1] <br />Distance to <br />Receptor <br />I I I I I I I <br />I I I I <br />I I I I