Posted by T_Bone on March 11, 2008 at 00:58:42 from (4.240.42.18):
In Reply to: O/T new well posted by Roy in georgia on March 10, 2008 at 19:31:09:
Hi Roy,
I see where so far your driller has given you the shaft (pun intended). Why drill a bore hole 250ft then set the pump at 150ft? What, is the water gonna jump up that other 100ft to the pump?
Well basics: A bore is drilled, the water fills the bore, then the pump removes the water from the bore. End water well 101 class.
By sitting the pump at 150ft he's left 60ft of static head sitting in the bore or 39gal or about 1gpm on a 4" bore, more on a larger bore. You have to set the pump 40ft off the bottom to keep sand out of the pump. He should have set about 40ft of perferated pipe (screened) and a 20ft section of solid pipe. The pump should set about 10ft up into the solid pipe to keep from pumping fines.
There's just not a good reason not too use 100ft of bore shaft unless the bottom was caving thus he drilled past the sands & gravel bearing water. When the bore fills with water, called the static level, then that supports the bore side walls. If he didn't screen case this pumping area then you would get mud water with alot of sand in the discharge water.
Any new well should pump clean with-in 48hrs during the sanitation pumping phase then remain clean for the rest of it's useful life.
Could be your over pumping the available water??? As in too many gpm for what the aquifer can produce.
There should be a sanitary seal put in before the bore was started. This is a 10ft or 20ft pipe about 40% larger than the desired bore size and 12" higher than surrounding surface, then packed with 3" of side wall concrete the full length of the pipe to ground level. This keeps all surface contaminets from entering the bore shaft. After the concrete sits over night then the next day the bore is drilled.
If this sanitary seal is missing or leaking then you would also get muddy water at the pump discharge. Some codes call for a 2ftx4" thick flat surface concrete seal around the sanitary pipe with a 1 on 12 slope on the concrete surface.
Your aquifer could come from a surface feed vien many miles away from your bore hole site. If that area had alot of rain then you could also see cloudy water in your bore, just highly unlikely that this would be a problem. Check your states water aquifer map to confirm.
You paid your well driller good money for a clean hole. I sure would call him and talk with him asking a few questions then do my own research to make sure he's telling me the truth. He may well have drilled you a good bore and it has a unforseen problem.
I sure would like to hear his response of why he sat the pump at 150ft tho.
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