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Comparison of Impacts Associated with the Proposed Modified Project Construction Noise Standards: Consistent with the Original Project, construction activities of the Modified Project are subject to the City Municipal Code regulations. Thus, the Modified Project would be in compliance with the City's construction related noise standards. No new or greater impacts related to temporary construction noise would occur from implementation of the Modified Project. Temporary Increase in Ambient Noise: The Modified Project would be smaller and therefore require less overall construction activity than the Original Project. The Modified Project would develop 240 fewer multi -family residential units and a smaller parking structure with 13,300 square feet less of subterranean parking. The Modified Project would involve the same types of construction equipment that would be operated in similar locations as the Original Project. However, the building setback along the eastern side of the Project site would be 50 feet greater. Thus, construction of building structures would be farther from the residences located to the east of the Project site. Consistent with the Original Project, Mitigation Measures NO1-2 and NO1-3 would be required to prohibit the use of large mobile equipment and loaded trucks within 50 feet of the residences to the east of the Project site and install a temporary noise barrier to reduce the temporary increase in ambient noise to a less than significant level. No new or greater impacts related to temporary construction noise would occur from implementation of the Modified Project. Groundborne Vibration: Consistent with the Original Project construction activities for of the Modified Project would generate short-term vibration levels that would exceed the distinctly perceptible vibration standard at receiver locations within 50 feet of large bulldozers usage. Therefore, like the Original Project, Mitigation Measure NO1-2 would be required to reduce vibration impacts to a less than significant level. However, the Modified Project would include a smaller parking structure with 13,300 square feet less of subterranean parking. Therefore, no additional vibration related to ground excavation for the parking structure would result, and overall, no new or greater impacts related to vibration would occur from implementation of the Modified Project. Operation Interior Onsite Noise: Consistent with the conditions of the Original Project traffic along the roadways near the Project site would generate noise that could exceed interior noise standards within some of the proposed residential units. Thus, like the Original Project, Mitigation Measure NO1-1 would be required to ensure that the appropriate windows and doors are installed, which would reduce impacts to a less than significant level. No new or greater impacts related to interior noise would occur from implementation of the Modified Project. Traffic Generated Noise: As described in Section 3.11, Transportation and Traffic, of this document, the Modified Project is estimated to generate 79 fewer a.m. peak hour trips, 96 fewer p.m. peak hour trips, and 1,186 fewer daily trips than the Original Project. The reduction of vehicular trips would also reduce traffic -related noise. Thus, consistent with the Original Project traffic related noise impacts would be less than significant, because fewer vehicular trips would be generated, no new or greater impacts related to traffic noise would occur from implementation of the Modified Project. Project Generated Operational Noise: To evaluate the potential noise impacts from operation of the Modified Project, a Focused Noise Assessment (included as Attachment A) was prepared. This Focused Noise Assessment calculates the potential operational noise levels due to the Project's stationary noise sources including: roof -top air conditioning units, trash enclosure activity, pad -mounted transformers, parking lot vehicle movements, outdoor courtyard activity, outdoor pool/spa activity, and parking structure activities, at seven off -site receiver locations adjacent to the Project site. To estimate the Project operational noise impacts, the Focused Noise Assessment used reference noise level measurements from similar types of activities, which are provided in Table N-1.