A differing site condition claim will almost universally result in both a cost and time impact. There will be additional, unanticipated costs incurred. And there will likely be a delay requiring additional time to perform.
A Type I differing site condition claim is when the contractor encounters conditions at the site different than those indicated in the contract documents. That seems easy enough to prove, right. Nope. And, I mean nope! If you don’t believe me, consider the recent decision in Meridian Engineering Co. v. U.S., 885 F.3d 1351 (Fed.Cir. 2018).