Drainage according to soil report - but how?

Hello,

I have a question about drainage.

Currently, my excavation pit is dug out (1.5-2m - I know this is too deep) and I am getting a concrete slab. For frost-resistant foundation, the installation of a frost protection layer is planned for me.

The soil report states that the planum or the last meter of frost protection must be permanently drained and, if free drainage is not ensured, it must be drained via a drainage system.

Since I have clay-containing soil, water is currently standing above the first two layers of gravel.

Can someone please help me with the next steps? Do I absolutely need the drainage and at what depth should it be installed? At 1 meter, where the frost protection layer begins? How do I execute it? Do I need a permit?

Thanks in advance…

Here is the excerpt from the soil report.

Isn't something like this absolute routine for a civil engineering company or site manager/architect? Isn't it your job to come up with a solution?

Can you write again whether groundwater was encountered by the soil surveyor and a section showing how the house will later be situated would also be helpful.

Personally, based on my current knowledge, I do not consider a drainage system necessary.

But if the surveyor requires it. Basically, it is just a drainage pipe wrapped in fleece, which is then installed all around at 1.0 m below the slab with a slope into the gravel.
A drainage system in groundwater is not permitted. Drainage systems must be applied for and it must be clarified what happens to the drainage water. Direct discharge is often not permitted due to suspended solids and requires a cistern with a sludge trap or similar.

Thank you for the response.

Attached is the section. Maybe that is already sufficient. Here the groundwater level can be seen. The construction is without frost skirts, but with a frost-resistant gravel base (1.05m).

The expert said it is currently like a bathtub and the 1.05m gravel must always remain dry, hence the drainage. I am afraid that if the earthworks contractor says it is not necessary, there could be problems...

Thank you..