When choosing a protective system for excavation, which factor is NOT a consideration?

When selecting a protective system for excavation, assessing soil type, vibration sources, and the presence of water is crucial as these factors significantly influence the safety and stability of the excavation site. Soil type determines the appropriate shoring or shielding methods necessary to prevent collapses. Vibration sources, such as nearby construction activities, can destabilize the excavation walls, affecting the safety of workers. The presence of water is also a key factor, as it can weaken soil and increase the risk of cave-ins, requiring additional measures for stabilization.

Client preference, while important in project planning and execution, does not impact the engineering and safety standards required for excavation. Safety measures must be based on technical assessments and regulatory standards rather than the preferences of the client. Therefore, it is not a consideration in the selection of protective systems for excavation.