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All excavations made in Type A soil that are 6 m (20 ft) or less in depth, which have
vertically sided lower portions that are supported or shielded, shall have a maximum
allowable slope of 3/4 to 1. The support or shield system shall extend at least 0.45 m (18
inches) above the top of the vertical side.






All simple slope excavations made in Type B soil that are 6 m (20 ft) or less in
depth shall have a slope of not greater than 1 horizontal to 1 vertical.