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However, the Project has the potential to result in exposure of persons to noise levels in excess of relevant standards as a result of increased traffic -related noise. As discussed in the DEIR, traffic along the roadways near the Project site would generate noise that could exceed interior noise standards within some of the Project units. Thus, some of the residential units would require upgraded windows and sliding glass doors with increased Sound Transmission Class (STC) ratings to meet the interior noise standards. As described in Section 4.8, Noise, of the DEIR, the residential units along N. Main Street would require upgraded windows and sliding glass doors with minimum STC ratings of between 27 and 30 to meet the interior noise standards. Mitigation Measure NOI-1 would ensure that the appropriate windows and doors are installed, which would reduce impacts to a less than significant level. (DEIR, pp. 4.8-10 through 4.8-13.) Mitigation Measure N0I-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 I-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. With the implementation of the mitigation measure identified above (MM-NOI-1), the Project's potential impacts relating to noise levels would be less than significant. (DEIR, pp. 4.8-10 through 4.8-13.) 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 FIR 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. (Final FIR, Clarifications to the Final EIR, Section 3.8.) 8.4.2 Groundborne Vibrations Threshold: Would the Project result in exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels? Resolution No. Page 18 of 76 Certification of the Magnolia at the Park EIR