Water pipeline for water backfeeding and irrigation

With us, the two holes for the brine pipes are 10-20cm apart, the multi-utility connection about 100cm away from them.

I have been desperately trying to figure out how to get another line out and forgot that we still have a complete spare sector at the [Mehrspartenanschluss], which was planned as a reserve for, for example, cable television. Can you run a line out from there?

Sure, if the diameter fits. You just have to ask the electrician what kind of cable he needs. I guess 5x6 or something like that.

In the division, there are cables with different diameters. In my opinion, that should work. I was just not sure whether the "introduction" can also be used as an outlet. From the outside, the landscaper is allowed to work with an excavator and shovel, or are the supply lines that are also involved the exclusive domain of the utility providers?

You or your agent may of course dig. It is your house and property. If he breaks something, you are also responsible.

I would prefer to dig separately and rather do another core drilling. You can then do it exactly where it fits best. The risk of digging near existing pipes and then compacting properly so that nothing gets damaged during settling would be way too high for me. Then you can also lay all supply lines into your technical shaft there.