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Table N-3: Project Operational Noise Level Compliance Receiver Location Land Use Noise Level at Receiver Locations dBA Threshold Exceeded? Lso 30 mins L2s 15 mins Ls 5 mins L2 1 min L.a, e1 min) Daytime Residential Standards 55 60 65 70 75 Nighttime 50 55 60 65 70 R1 Residential 37.9 40.7 44.8 48.7 51.8 No R2 Residential 43.2 45.4 49.0 52.8 58.6 No R3 Residential 46.3 48.6 51.7 54.9 59.9 No R4 Residential 46.9 49.1 52.1 55.3 59.9 No R5 Residential 36.7 39.4 45.7 51.2 58.5 No R6 Residential 34.3 37.2 43.3 48.8 56.0 No R7 Residential 31.4 34.2 39.0 43.6 50.3 No Source: Urban Crossroads, 2019. Attachment A. Conclusion for Noise Consistent with the Original Project, the construction generated by the Modified Project would generate temporary noise and vibration that would require mitigation to reduce impacts to a less than significant level. Also, due to the location of the proposed residential units, mitigation is required to ensure that interior noise is within City standards. With implementation mitigation identified in the EIR, potential impacts would be reduced to less than significant levels. Based on the foregoing, none of the conditions identified in CEQA Guidelines Section 15088.5 that would trigger the need to prepare a recirculated EIR or other environmental document exist. The Modified Project would not result in either a new significant environmental impact or a substantial increase in the severity of a previously identified impact. EIR Mitigation Measures Mitigation Measure NO1-1: The Project plans and specifications shall include the following construction requirements to be implemented and verified prior to provision of occupancy permits: • Windows/Glass Doors: Residential units adjacent to N. Main Street (all floors) require upgraded windows and sliding glass doors (all windows/doors on all floors) with minimum STC ratings of 30, and all other buildings require standards windows and sliding glass doors with a minimum STC rating of 27. • Exterior Doors (Non -Glass): Exterior doors facing N. Main Street (all floors) require upgraded exterior doors with minimum STC ratings of 30 and shall be well weather-stripped, and all other residential building exterior doors shall be well weather-stripped and have minimum STC ratings of 27. Well -sealed perimeter gaps around the doors are essential to achieve the optimal STC rating. • Walls: At any penetrations of exterior walls by pipes, ducts, or conduits, the space between the wall and pipes, ducts, or conduits shall be caulked or filled with mortar to form an airtight seal. • Ventilation: Residential exterior vents shall be oriented away from 1-5 and N. Main Street. If such an orientation cannot be avoided, then an acoustical baffle shall be placed in the attic space behind the vents. Mitigation Measure NO1-2: The Project plans and specifications shall include the following. requirements: • Large loaded trucks and mobile equipment, such as bulldozers (greater than or equal to 80,000 pounds) shall not be used within 50 feet of the eastern boundary of the Project site. Instead, smaller, rubber -tired mobile equipment (less than 80,000 pounds) or equivalent alternative equipment shall be used within this area during Project construction. • All construction equipment, fixed or mobile, shall be equipped with properly operating and maintained mufflers, consistent with manufacturers' standards. The construction contractor shall place all stationary