My friend just drilled 700' and hit the mother lode. Its a 6" well and its got 35 GPM spilling out the casing. It has only 20 foot of 6" casing [PVC] grouted into granite, and the well driller advised the owner NOT to cap it and use the pressure instead of a pump, he worries that the pressure might blow out the casing. I have a feeling that the driller was planning for the typical dry hole or a 2GPM slogger. It seems to me that wasting 35 GPM down the hollow might endanger someones water up the mountain, and be a general waste in a relatively dry area. The well driller is pretty new, I do not think he has much experience with such a well. [or/and maybe he did not grout the casing correctly?] My advice to the owner was to install a valve and a gauge and to slowly close it and monitor the pressurebefore deciding how to use this gift... I really do not see the casing squirting up into the sky, and it seems to me that the pressure might be quite low at surface to push out 35 GPM from 700 feet. How would you big guys tackle this deal assuming the owner wants to NOT use a pump, preserve the ground water for the neighbors, and not have the water bypass his [short] casing? Check the pressure then set more casing if a high value? This sounds more like an oil well issue than a water well problem!