The intent of the project is to repair a section of the Sheppard Air Force Base (AFB) 15kV class electrical distribution system (specifically Circuit 1) and the airfield lighting, power, and control systems connected to Circuit 1. This work includes conversion to underground (UG) of the portion of Circuit 1 that is overhead (OH), repair of the portion of Circuit 1 that is already UG, repair of airfield lighting equipment, and repair of portions of the airfield lighting system’s power, series lighting, and control circuits (some in the base bid and some in options 3 and 4 if awarded). At the end of construction, Circuit 1 shall be #500 kcmil copper from the substation to pad mounted switch SG-106, #4/0 copper from SG-106 to SG-109, and #2 copper from SG-109 to SG-110. Remove the existing OH portions of Circuit 1 identified for conversion in its entirety. Remove the existing UG portions of Circuit 1 identified for repair in its entirety to include duct banks. Also, remove the existing airfield lighting, power, and control circuits identified for repair in their entirety (to include duct banks) unless deemed appropriate for continued use by the Government. Most existing pad mounted transformers will be replaced due to condition, some in the base bid and some in option 2 (if awarded). All existing pad mounted switches will be replaced due to condition or configuration. Work will require provision of manholes and UG ducts necessary to separate the power, series lighting, and control circuits into separate duct banks. In some sections, these circuits are presently in the same duct bank and even in the same duct. Work will also require removal of existing and provision of new street lighting. Boring with steel casing is required, but pavement cutting will be considered on a case-by-case basis if approved by the Government. The design phase shall determine the best method of accomplishing the repair of Circuit 1 which consists of approximately 0.65 miles of OH distribution and approximately 4.9 miles of UG distribution.