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Tthe Utility Manual is a regulation and is part of DE Administrative Code and companies making installations within State roadway rights-of-way need to abide by the requirements.
http://deldot.gov/information/business/drc/manuals/utilities_manual_2008_may_5.pdf
The below link other takes you to the official administrative code version which does not contain appendices.
http://regulations.delaware.gov/AdminCode/title2/2000/2400/2401.shtml#TopOfPage