Molehill under maintenance

You might wonder, like me, what the crane was doing there. It looks like it is working on one of those molehills. You can see three, in total there are six. A big mole was caught and now being pulled out?
Nope. These hills are all part of the water extraction of our neighbouring village. In each hill is a (big?) pump with a big pipe going down, to suck up the drinking water in deeper layers. These pumps need maintenance once in a while. I saw some weeks ago that in another of the hills parts were replaced.
The water goes from the pumps to a water softening plant, before it is sent to all the receivers (even 40% of the water of our village seems to come from that plant).