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.)

piles), alternative foundation types for the new construction (e.g., spread footings versus driven piles), alternative compaction methods, and physical measures (intervening trench, increased distance).

• Require monitoring to be conducted at the building during construction. This monitoring can include crack gages on existing cracks and vibration amplitude monitoring. Establish warning and stop work thresholds for monitoring. Implement visual and audible signals that are triggered by a vibration monitor when exceedances of warning and stop work thresholds occur. If warning thresholds are exceeded routinely, consider alternative construction approaches.
• If the stop work threshold is exceeded, evaluate the condition of the building for damage. If no damage is indicated consult with structural engineer and/or architectural historian to assess whether higher thresholds are possible and adjust as appropriate.
• If damage occurs determine if any other construction approaches are feasible to reduce vibration. If none is available examine the severity of the damage to determine if damage is minor and repair is feasible. If repair is feasible continue with construction, but monitor vibration and damage closely to ensure that damage remains repairable. Consider whether a lower stop work threshold is feasible.
• If damage approaches becoming unrepairable and vibration levels have approached or exceeded the stop work threshold repeatedly, reconsider construction of the project.
• Repair any damage that has occurred.

Building shall be

undertaken during pile-

driving activities to inspect

for damage.

Should damage to the

Roundhouse or the

Machinery & Equipment

building due to pile-driving

activities be detected,

construction shall be

halted until damage is

repaired and modified pile-

driving protocols or

alternatives methods are

implemented to avoid

further damage.