>anything other than "pretty much exactly as expected" is vanishingly tiny. Anyone who has ever worked construction on a historic site (even with ‘good’ as-bui

>anything other than "pretty much exactly as expected" is vanishingly tiny. Anyone who has ever worked construction on a historic site (even with ‘good’ as-built drawings) can give you plenty of examples of this going wrong whether it’s running into abandoned/moved utilities, unknown geology (increasingly common there deeper you go), or a host of other examples with anything more complicated that fence post digging.