The claim: Road to facility is blocked off by cement barriers and a stop sign. Sign states area is restricted; as of 1997 there were barbed wire fences pointing inward, a row of stadium lights pointed toward an empty field, etc. Black boxes on poles may have been cameras.
What it really is: Mather Air Force Base was closed in 1993, and is now the Sacramento Mather Airport.
Barbed wire fences, stadium lights, cement barriers, stop signs, and cameras are all very common things for public airports, and are necessary for both security and safety measures.