An underground utility trench measuring twenty-four inches wide is excavated to varying depths depending on location, requiring forty-five inches in dirt or fifty-one inches in street conditions. A four-inch sandbed is placed at the base of the twenty-four-inch wide trench to support the utility conduit or duct bank. Vertical clearance dimensions indicate a twenty-four-inch in dirt or thirty-inch in street depth above the twenty-one-inch high conduit zone.
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