Trench Width and Cover Requirements. Typical trench dimensions will vary with the cable/conduit arrangements but will range from approximately three to six feet in width and up to approximately six feet deep. A total of approximately 34,000 linear feet of trenching will be dug for the conduit installation. The minimum soil cover above the conduit bundle will be 42 inches. If a shallower cover is necessary for an isolated area, appropriate duct bank protection will be used. As necessary, the duct bank may be installed deeper than 42-inches to avoid subsurface conflicts such as existing utilities.
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Sources: Environmental Management and Construction Plan, Environmental Management and Construction Plan