Water, gas, and electricity in a trench

Hello,
I have a small house in a very mountainous location.
From the street below, I want to lay gas, electricity, and water through my private property.
The slope is about 50° with rocky, stony, root-infested soil, and the trench would have to be dug over about 70 meters.
This means very difficult and complex excavation work.
How deep and wide does the trench have to be at a minimum? What do I have to consider?
Can I lay water at 70 cm depth and everything else above with marking tape 20 cm below the surface?
Regards,
Frank

I would direct your question to the utility company.

With us, everything could have been laid in one duct. Water frost-free at under 80 cm, gas and electricity at 60 cm. 20 cm is probably not deep enough, since the marking tape won't help you then, as you would already be hitting the cable with the first spade stroke.

In this situation (50°), only a walking excavator can help. Generally, I would rather inquire how the utility providers feel about a horizontal (flush) drilling. With that, the incline could be managed without excavation, laying correspondingly large protective pipes in 1 or 2 boreholes, into which the actual utility media would be installed.

In case of doubt, this would also be significantly easier to maintain, as you don’t have to work on the slope every time, but “only” work with the installed lines.

In this situation (50°), only a walking excavator can help.

The slope is forested. No excavator can get through there, or it is not supposed to / allowed to clear that much. (landscape protection area)

Generally, I would rather ask how the suppliers feel about a horizontal (flush) drilling.

It is private property, so the suppliers are probably no longer responsible?!

The slope is forested. No excavator can get through there or it is not supposed to / allowed to be cleared that much. (Landscape protection area) It is private property, so the utility providers are probably no longer responsible?!

If there is forest there, drilling is probably the best solution anyway. What kind of trees are there (regarding root depth)? The utility providers also set requirements for the construction of the trenches on private land, unless you build a complete transfer shaft at the property boundary (in which, for example, shut-off devices, water meters, etc. are installed). But as soon as the utility provider connects up to your house, they have, to my knowledge, the authority regarding safe installation.