How would the base be sealed for you guys? Don't you have a site manager? He usually takes care of the correct execution according to DIN.
I will post the report later as soon as it is available. This was also already explained somewhere here by the first expert.
Yes, we have a site manager. But as you can read in this thread, not everything runs ideally and the site manager says he is aware that he deviated from the DIN but that it is faster and, from his point of view, equivalent.