I was wondering witch is the faster more efficient way to digging a deep trench. Sloping or benching? The material is like a clay mix brown shale. It has good stability when digging. Trying to increase footage. Need to spend more time hogging out material than shaping the sides. Currently using multi-bench technique( 12' deep). Laid 80' ft 24" ADS set manhole and 24" headwall plus back filled ditch with 325c excavator. 8hrs.
Sloping vs benching
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