Dig It, What Is The Gas Company Digging For?

Two hours until the jackhammers commence and I will lose sleep without recompense. Tell me ladies and gentlemen, just what is it, that the Gas Company looking for:

A) A frisbee lost during the Summer of Love.
B) Dinosaur bones.
C) The bones of Emperor Norton.
D) The Last Emperor.
E) The Last Days of Disco.
F) Just to give yours truly, a dose of the letter that starts this line.