California Code, Labor Code - LAB § 6705.5

Regulations of the department requiring the shoring, bracing, or sloping of excavations, or which contain similar requirements for excavations, shall only apply to the excavation of swimming pools where a reasonable examination by a qualified person reveals recognizable conditions which would expose employees to injury from possible moving ground. If these conditions are found to exist with respect to a swimming pool excavation, employees shall not be permitted to enter the excavation until the condition is abated or otherwise no longer exists.