09.05.2023 Reso 0091 PC23-20 PC Reso 800 Main Hotel Sequoia

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ATTY/RESO.0091/PC RESO 800 MAIN HOTEL SEQUOIA REV: 09-01-23 VR Page 25 of 32 Coordinator shall work directly with an assigned City staff member.) [COA][MMRP] NO-3: The City shall reduce ground-borne vibration levels that may be generated by future site-specific demolition and construction activities by imposing conditions of approval on all future projects involving demolition and construction activities, which conditions shall require the Project Applicant to ensure the following ground-borne vibration abatement measures are implemented by the construction contractor: • Restrict vibration-generating activity to between the hours of 7:00 AM and 5:00 PM, Monday through Friday except when authorized by the Building Official (Redwood City Municipal Code Section 24.32). • Notify occupants of land uses located within 200 feet of pile-driving activities of the project construction schedule in writing. • Investigate in consultation with City staff possible pre-drilling of pile holes as a means of minimizing the number of percussions required to seat the pile. • Conduct a pre-construction site survey documenting the condition of any historic structure located within 200 feet of pile driving activities. • Monitor pile driving vibration levels to ensure vibration does not exceed appropriate thresholds for the building (5 mm/sec (0.20 inches/sec) ppv for structurally sound buildings and 2 mm/sec (0.08 inches/sec) ppv for historic buildings. d. Operational Noise Performance Standard (SEIR Mitigation NO-2): Prior to the issuance of any building permit, future project applicants within the amended DTPP area shall ensure that all mechanical equipment is selected and designed to reduce impacts on surrounding uses by meeting the performance standards of Chapters 36.7.B of the Redwood City Zoning Code, limiting noise from stationary sources such as mechanical equipment to 55 dBA at the property lines. If noise levels exceed these standards, the activity causing the noise shall be abated until appropriate noise reduction measures have been installed and compliance has been verified by the City. Methods of achieving these standards include, but are not limited to, using low-noise-emitting HVAC equipment, locating HVAC and other mechanical equipment within a rooftop mechanical penthouse, and using shields and parapets to reduce noise levels to adjacent land uses. Project applicants shall submit an acoustical study prepared by a qualified acoustical engineer during final building design that evaluates the potential noise generated by building mechanical equipment and to identify the necessary design measures to be incorporated to meet the City’s standards. The study