The LATimes story on which this IBD article is based is quite good. Speaks to geologists and engineers about the challenges of tunneling through the San Gabriel mountains. Made is sound as though Cave-ins will be very difficult to predict or prevent. The mountains are highly friable.
RE: Speaks to geologists and engineers about the challenges of tunneling through the San Gabriel mountains. Made is sound as though Cave-ins will be very difficult to predict or prevent
So, did the original estimate take the above difficulties and challenges into account and factor in the cost? I think not.