Well Lining!!!

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Old 01-11-09, 08:36 AM
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Well Lining!!!

We have a private well that is 402 ft. deep. Only real problem with it is iron and the real problem is that it fluctuates depending on rainfall and water usage. If it doesn't rain alot at once or we don't try to wash 3-4 loads of laundry back-to-back it's OK and stays around 1-3ppm, easy to control. If we get 3-4 inches of rain in a day or 2 or we use alot of water that causes the iron to stir up. We have alot of iron pockets on our land and were told that the well was probably drilled through some large pockets and as the static water level changes it probably moves in/out of these pockets causing the fluctuation.

We do have a chemical injection system that utilizes one pump/tank with alum for iron removal and another pump/tank with caustic/bleach for PH neutralization and disinfection/iron oxidation. The pumps settingsa are manually controlled and operate on a flow sensor as water is used.

One solution would be to use some sort of iron sensing probe in the water line coming from the well and that would control a pulse feeder pump to increase/decrease the alum for the fluctuating as needed. The caustic/bleach setup never changes so it could be left on manual.

The other solution would be to have the well inspected with video and possibly have it lined. If it was to be lined all the way to the aquifier (if possible or needed) could this possibly eliminate the iron altogether and eliminate the need for any alum injection? Anybody had similar issues and had a lining done? Thanks in advance. Later!
 
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Old 01-11-09, 02:29 PM
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the well must have been installed quite some time ago. most wells today are lined from surface to the water bearing zone, that should help to prevent the problem you are describing. unless you have sink holes or caves in your area you should not see that severe of a change due to rain with that deep of a well. it takes years for rain water to affect aquifiers that deep unless a direct channel is available due to mines, openbore holes, or caves.

I would have it inspected and maybe lined if lined then use a neat grout or sodium bentonite product to seal off the shallow water bearing zone this more than likely will help with the water quallity issues you are experiencing, you might be able to use a packer and pull samples from different areas to find out just exactly where the high iron is coming from. in the long run it might be the best and cheapest way to correct this problem

murphy was an optimist.
 
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Old 01-11-09, 05:54 PM
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The well was drilled only 7 years or so ago. In this area the casing (steel) only goes down the first 40 feet or so and ours is 42 ft. After that I guess it's just dirt/rock that makes up the wall the rest of the way down. The theory is that as the water table changes it stirs up the iron. I guess the only real way to tell will be a video inspection. Later!
 
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Old 01-11-09, 07:16 PM
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The way your well is drilled, sounds like it is in rock. Most wells that are drilled in rock, only case the top 30 to 50 feet. The rest of the way down is solid rock, in most cases.
Most of the time, wells that are in rock have a high iron content, and the water is (hard).


Travis
 
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Old 01-12-09, 03:59 AM
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Thanks for that info. Could be the case, but our water is relatively soft, testing at only 3 grains. We do have a softener, but only because we transferred it from our previous home to this one. It does help a bit with some of the residual iron that might escape by the chemical setup, but can't handle much.

I think we're going to have it video inspected to really get a good look and go from there. Thanks again. Later!
 
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