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Ramboll - Stoneridge Mall Residential Project <br />158850326.2 <br />8/11 <br />Confidential <br />Because current Section 9.04.030 regulates only the noise that may be generated by a residential project <br />and is not relevant to the impact described in the SEIR, this assessment considered the potential exterior <br />noise levels at the Project site boundaries from non-Project (off-site) stationary (non-transportation) <br />sources in the vicinity of the Project site and evaluated those noise levels relative to the limits quoted <br />above. These non-Project stationary noise sources might include, for example, mechanical equipment <br />associated with the shopping mall and other nearby commercial facilities and loading dock activity at the <br />shopping mall. <br />For nearby mechanical equipment, assumed sound levels were chosen based on the upper end of sound <br />level data available from manufacturers for similar equipment. The 10x Genomics Draft Mitigated <br />Negative Declaration assumed rooftop equipment for the 10x Genomics buildings would not exceed 60 <br />dBA at 25 feet. This was used this for the analysis of sound from the 10x Genomics site. Sound levels for <br />loading dock activity were based on typical sound levels for truck activities. The assumed sound levels of <br />equipment around the project site are shown in Table 5. <br />The Locations of nearby rooftop mechanical equipment loading docks were identified using aerial <br />photographs. The only nearby loading dock serves Macy’s Department Store at the Stoneridge Mall. See <br />Figure 2 for locations of mechanical equipment and the loading dock. <br />Table 5. Assumed Sound Levels for Non-Transportation Sources <br />Source Assumed Sound <br />Levels <br />Number of <br />Sources <br />Mall – Larger RTU 63 dBA at 25 feet 10 <br />Mall – Small RTU 56 dBA at 25 feet 12 <br />6200 and 6210 Stoneridge Mall <br />Road – Large RTU <br />63 dBA at 25 feet 5 <br />6200 and 6210 Stoneridge Mall <br />Road- Chillers <br />77 dBA at 25 feet 2 <br />10x Genomics Rooftop <br />Equipment <br />60 dBA at 25 feet 1 <br />Mall Loading Dock – Idling <br />Truck <br />70 dBA at 25 feet 1 <br />Mall Loading Dock – Backup <br />Beeper <br />79 dBA at 30 feet 1