San Francisco Building Inspection Commission Codes § 13.1 Selection of Instrumentation and Monitoring Requirements

The type, location, and requirements for instrumentation should be determined by the GEOR based on the impact of construction related to excavation, shoring, dewatering, foundation installation including noise and vibration, and implementation of ground improvement on groundwater conditions and performance of adjacent structures, roadways, utilities, and other improvements.

The geotechnical report should provide the rationale for selection of instrumentation type and number, installation method, and the frequency of monitoring for each type of instrumentation.

The frequency of monitoring should be defined based on the type of loading and construction activities. Monitoring should be initiated before the construction work starts to obtain ambient or baseline conditions. As appropriate, monitoring rates may be adjusted after initial period of monitoring, if data from instrumentations indicate that the rate of change is diminishing with time.

The instrumentation used for monitoring during construction should be sufficient to meet accuracy and reliability requirements needed for the duration of monitoring.