Assessment of Soil Report - Experiences

Have it re-drilled.

In the end, you will only see it when
excavating.

The property is already yours, so just take the costs as they come.
Settlement with the civil engineer not at a fixed price but per m3 (or better per tons).
Assume the higher costs for the bank. For yourself, something in the middle.

Well, if money were really no object, I would just accept the costs as they come.

But going from planned 20k earthworks to possibly 50k is quite a difference!

I would like to know beforehand whether the worst case is really coming my way or if I can approach it a bit more relaxed...

Should I then contact the company that created the report again for re-drillings?

That doesn’t help you.

You might be unlucky and make 4 drillings and find nothing, and still have a clay lens under your house.

Just plan for the expensive option and be happy if it turns out cheaper.

That doesn’t help you.

You can be unlucky that you make 4 boreholes and find nothing, and still there is a clay lens under your house.

Just calculate with the expensive option and be happy if it gets cheaper.

I contacted the company again to inquire about additional boreholes. The contact person told me that the glacial till clay at our place has good load-bearing capacity and lies deep enough, so it doesn’t need to be removed.

The general contractor is very well known and experienced. The gentleman who prepared the report said he could only explain it by the fact that the site manager didn’t look carefully that day and what kind of glacial till clay it actually is.

Afterwards, I contacted the general contractor again and was told the same thing as the author of the construction report.

The site manager was here on site, it was raining, and in my presence he really only briefly looked at the scale on the tablet where the results were visible. To err is human, no matter how it turns out. However, the huge difference from the original estimate almost discouraged me.