If you have noticed a water dripping from your horizontal radon pipe , it means that pipe does not have pitch towards the ground. Radon pipe has condensation, its normal . Radon fan is powerful enough to pull from radon collection point soil moisture. This water is collected as condensation in radon pipe. If pipe does not have pitch , this condensation / water is trapped in horizontal pipe.

The radon system also has bends. If you hear the gouging sound from one of this bend, it means one of horizontal pipes is connected downward in a wrong way water is being trapped in radon pipe.

Make sure all radon pipes has a a pitch towards the ground for a proper condensation drainage in the system.