ECC provides vibration monitoring services in accordance with the NYC Building Code. The monitoring process is outlined in technical guidance provided by the NYC Department of Buildings in the Technical Policy and Procedure Notice # 10/88 and within Chapter 33 for demolition and related new construction.
Condition Survey : As part of the vibration monitoring process ECC performs a survey of the project site and adjacent structures documenting baseline conditions prior to start of construction.
Photograph and survey reports follow and compare the baseline conditions with conditions during or after construction.
Monitoring Plan : In accordance with NYC Building Code 3309.16, develops a site and structure specific monitoring plan consisting of the scope and frequency of monitoring acceptable conditions and reporting criteria, along with a detailed map noting the location of all crack and vibration monitors.
Optical Monitoring : When called for, surveyors install optical monitors on buildings in the area of expected influence to the construction site to monitor vertical and lateral displacement.
Vibration Monitoring : ECC installs seismographs to monitor vibrations around the clock at the job site. A text or e-mail is automatically sent to the contractor when the predetermined threshold is exceeded.
In addition, waveform recordings of the vibrations can also be provided. Weekly reports including the highest vibration reading reached for each day are prepared however, reports can be tailored to your need.
Crack Monitoring : The pre-construction condition survey establishes which visible cracks are to be monitored. Hirani inspectors read the crack gauges that have been affixed to the cracks, and report movement readings in millimeters along with a photographic documentation report for each gauge.