The agency CM is managing a contract that installs interior finish work for an underground pedestrian tunnel. The concrete tunnel shell was constructed under another contract over a year ago. The shell contract specified embeds in the cast-in-place ceiling for hanging all-thread to support chilled water pipes. The finishes contractor has discovered that only expansion anchors were installed, which will not support the pipe weight. He proposes a costly change to retrofit embeds using epoxy. The CM learns that the tunnel shell designer approved the shell contractor's submittal for the expansion anchors. Which of the following is the CM's best course of action? a. Contact the shell designer to design and contract for the repair based on the submittal approved in error.
b. Ask a third party task order contractor to design and install the retrofit with back charge to the shell contractor and shell designer in proportion to their contract dollar values.
e. Issue a change order to the finishes contractor for the epoxy embeds. Seek to recover from the designer or shell contractor.
d. Contact the shell contractor to do the retrofit based on a latent defect.