Evaluation of offer for civil engineer for wastewater and rainwater

Hello everyone,
I have received an offer from the civil engineer for the installation of the wastewater and rainwater pipes including the soakaway shaft. Can someone help me to classify the numbers?
The numbers are excluding VAT.

I just took out my invoice, the numbers seem fair (comparable to mine and those were not astronomical prices).

Item 3 initially has nothing to do with the sewage connections.

No, of course Pos. 3 has nothing to do with it :) I also meant the other positions. Thank you very much for the info.

No inspection pit for wastewater?

The inspection shaft is fortunately already in place. It was installed during the renewal of the road.