"Cost of highway construction" includes the cost of relocating or removing utility facilities in connection with any project on the Interstate System or primary state highway system within counties.
"Cost of relocation or removal" includes the entire amount paid by such utility properly attributable to such relocation or removal after deducting therefrom any increase in the value of the new facility and any salvage value derived from the old facility.
"Facility of a utility" includes pipes, mains, storm sewers, water lines, sanitary sewers, natural gas facilities, or other structures, equipment, and appliances.
Va. Code § 33.2-308