| Vibration monitoring is performed during vibration producing construction activities or other activities likely to cause ground vibrations and potential damage to other structures. For that purpose, Testing Mechanics Corporation utilizes MultiSeis Plus Vibration Monitors (or equivalent) to monitor particle velocity in three directions, vertical, longitudinal and transverse. If the vibrations caused by construction activity as measured at the adjoining structures are kept below certain threshold levels, they are not likely to cause physical damage to the building. Testing Mechanics Corporation identifies 0.5 inches/second as the field "vibration monitoring action level". If this level is reached, then the Testing Mechanics Corporation's on-site representative will notify the Project supervisor that the vibration levels (peak vector sum) have met or exceeded the field threshold level (0.5 inches/second). Daily reports are provided including histograms for all events, and the peak vector sum measured at the instrument station for the duration of the testing. The final daily results are compared to the recommendations as set forth by the United States Bureau of Mines (R18507) and the Office of Surface Mining Reclamation and Enforcement |
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