A locking cover apparatus for construction vaults. The cover has a latch portion configured to rotate in a first and second direction when a threaded locking security bolt is rotated in the first and second direction respectively, and where the cover is locked from removal from the vault when the latch portion comes into contact with a first stop mechanism after rotating in the first direction and wherein the cover is unlocked when the latch portion comes into contact with a second stop mechanism after rotating in the second direction.