Mitigation Monitoring and Reporting Matrix (continued)

Significant Impact Being Mitigated

Mitigation Measure

Responsibility for Implementation

Enforcement Responsibility

Monitoring Responsibility/ Frequency

Actions Indicating Compliance

Noise and Vibration (cont.)

Site design measures, including use of building orientation to minimize window exposure toward noise sources, avoid placing balcony areas in high noise areas, and use of buildings as noise barriers;

• Use of acoustically rated building materials (insulation and windows);
• Construction of architectural noise barriers between sources and receptors; and
• Provision of landscaping or other non-noise- sensitive buffer zones between sources and receptors.

Exposure of onsite residents to vibration from rail operations.

DSP and DSP-V

scenarios.

Measure 4.J-2a: All development in the Baylands shall be designed to avoid vibration from Caltrain operations in excess of 72 VdB for residences. Prior to issuance of any building permit for structures intended for human occupancy within 200 feet of the mainline track, a detailed vibration design study shall be completed by a qualified acoustical engineer to confirm the ground vibration levels and frequency content along the Caltrain tracks and to determine appropriate design to limit interior vibration levels to 72 VdB for residences. Implementation of the recommended measures of the acoustical study into project design elements shall be verified by the Brisbane Building Department as part of the plan-check process.

Specific measures to achieve the performance standards set forth above shall include all or any combination of the following methods:

• Use of vibration isolation techniques such as supporting the new building foundations on elastomer pads similar to bridge bearing pads;
• Installation of vibration wave barriers. Wave barriers would consist of control trenches or sheet piles, which are analogous to controlling noise with sound barrier. The applicability of this technique depends on the characteristics of the vibration waves.

Applicant(s) for development of residential structures intended for human occupancy within 200 feet of the Caltrain mainline track shall provide a vibration design study prepared by a qualified acoustical professional verifying that the performance standards set forth in Mitigation Measure 4.J-2a will be achieved.

City of Brisbane Building Official

Prior to issuing any building permit(s) for residential structures intended for human occupancy within 200 feet of the Caltrain mainline track, the City Building Official shall review the vibration design study prepared for the applicant by a qualified acoustical professional to ensure that the performance standards set forth in Mitigation Measure 4.J-2a will be achieved.

The City Building Official shall also be responsible for monitoring site construction to ensure that the development features proposed by the applicant to meet applicable performance standards are constructed as approved.

Issuance of building permit(s) for residential structures intended for human occupancy within 200 feet of the Caltrain mainline track in compliance with Mitigation Measure 4.J- 2a.