My experience was watching the guy do it for me in FL. [Shallow (33') well for lawn irrigation] However, being he was very good and talkative, I picked up some tips. (I ended up with a 55 gpm @ 40 psi volume where two neighbors who went with the lowest bidder ended up with 12 gpm at 20 psi).
First: steel pipe will be more ridgid and less tendency to bend off on its own as it hits obstructions (hard clay, tree toot, etc). PVC is too flexible.
Second, If the water stops coming up out of the hole bring your "drill" back up immediately. Otherwise, the silt will pack in along your "drill" and make it almost impossible to remove.
Third, put a sleeve on the forward tip of your "drill" at least as large as the well casing (pipe, screen and any PVC connectors that hold it together). Ex: If your well pipe is going to be 1 1/2" PVC, use a 1 1/2" steel pipe to drill and put a sleeve on the end to increase the diameter of the hole large enough so the connectors on the pvc will drop down in it. You may be able to use a 1" steel pipe to get more velocity at the drill, but you still will need almost a 2" diameter tip to blast a big enough hole for the 1 1/2" pipe and connectors.
If your drill does get seized up, you may be able to run another smaller pipe down alongside it to free it up. (That happened also and they used 3/4" schedule 80 for that).
Down there, the "soil" was mostly sand, and the guy knew when to stop when we started seeing crushed shells coming up for about 12" of depth. The porous shell layer let the water flow enough to replenish the well point as fast as it was pumped out. The "lo-bid" guy stopped at a 2" layer that wasn't as deep, and it did not provide enough water to the well point. I don't know what guage you would use to determine a good water flow unless you have some neighbors that have wells that can give you a depth estimation.
The only other well I watched being drilled (I was about 6 yrs old) was when my dad, uncles and grandpa dug one using an auger-type post-hole digger (12"d) that was made to use 3/4" pipe. They constructed an A-frame and went down almost 100' (twist down with pipe wrenches about 6" and pull up and dump and then back at it. After 10', it meant disassembling/reassembling pipe at joints every 10' up and down. Took several weeks and a whole bunch of cussin' when they went too far and had to get the car and a block & tackle to pull it up, not to mention a wagon load of beer. My dad inherited the post hole digger, and my older brother inherited it when Dad died. I can probably get it for you if thats the way you want to go. (By the way, they drilled where a guy using a willow witching stick told them as 2 previous attempts came up dry. Where they drilled it came up as an artesian well with water coming up to about 6' of the surface level).
Haven't used a well point hammered in, so can't comment on that. Those that tried it in FL ended up with smashed well points when they hit a layer of hard pan.
Hope this helps
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