I don't have the estimates anymore, but it was something like 32 to 37 piers for $17K-20K, or $30K with the tunnel. Atlas and I think Du West came out. With the tunneling, they would look for, and fix (for extra) any leaks, which we probably have. A hydrological test would come with the package. I did think of having an engineer come out, but never did. A plumber awhile back did say many of the pipes around here (built in 1958) were not in good shape.