The contractor that installed my septic system had an extend-a-hoe - Caterpillar, on steel tracks, the boom extended. Down to the spring - rip out the old "well box" and plumbing. The homesteader had built a box that housed an old two piston wobble pump. It pumped water up to the one sink in the homestead house. Considering this was the 1890's - they were state of the art - ultra modern.
He dug down as far as possible and hit gravel at about 18 feet. Was able to go about another four feet into the gravel. Set one 4' diameter, 4' high perforated cement ring on the bottom. Came all the way back up to the surface with non-perf cement rings. Topped it off with a "reducer" cement ring and lid. Backfilled around the bottom perf'ed ring with washed coarse stone. Filled up to the surface with the dug dirt.
Then the fun began. For the next 76 hours, continuously, I pumped the spring to clear the mud, silt & sand. Used a 5" diesel powered trash pump - ~ 500 gpm. I built a surge tool - like a plumbers helper. A long 2x4 with a chunk of plywood nailed on the bottom. EVERY half hour - either myself, my wife or my son - down to the well - check the fuel level on the trash pump - use this home made surge tool to surge the well.
After 76 hours we were dam tired and figured it had been surged/pumped enough to clean it out. During this time of continuous pumping the water level NEVER dropped more than half an inch. This is just one of many springs that feed my little lake. Fortunately, this one is on dry land. The remainder of the springs are out under the water in the little lake( 5 acres of open water - 80 feet deep).
I've used this setup for 38+ years now. House water - water the yard. I have a half horse submersible pump in the spring and pressure tank in the basement. Year-round the water is clear as a crystal and always 54 degree F.