on the demolition of the east span of the san francisco-oakland bay bridge in spring 2017, bluegrass cut and segmented the above-water blocks of piers e6, e7, e8, and e10 through e16, then core drilled for rigging and removal all the cut blocks except those on e6. the pier demolition project was authorized by the san francisco bay conservation and development commission in part to mitigate for all the fill associated with construction of the new east span of the bay bridge.