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Author:
miami75 (MA)
My basement foundation wall has a 3 inch PVC pipe coming in from the outside. Inside this PVC pipe is a black plastic pipe from the well, as well as an electric wire, both leading to the water pump.The problem is that water leaks from the PVC pipe after a heavy rain, or spring run-off. The leak is not from the foundation wall, but from the interior of the PVC pipe. Attempts to fix this to date have involved interior work, trying to avoid exterior digging. The line from the well to the house goes under my driveway. Most recently, Prime-flex 900 XLV watercutoff has been sprayed into the PVC pipe as it enters the basement. This product is supposed to expand when water hits it, and although it did expand and reduce the flow of water, it did not stop it. Presently it is not leaking as it is not raining out. I am afraid the next step, come spring, will be to dig outside, unless someone has a better idea.
here's a picture: 
Edited 1 times.
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Author:
waukeshaplumbing (WI)
i think your going to be digging it up...right now your putting a bandaid on it...problem needs to be fixed at its source
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Author:
packy
i agree. just to be safe, make sure the stuff you sprayed into the pipe doesn't have any adverse affect on the black poly pipe or the wiring.
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Author:
m & m (MD)
You might try this: remove the expansion foam as far back as is possible. Take some bentonite (pelletized or crushed) and force it into the pipe as far back as you can, leaving maybe 6" or so void on the front end of the pipe which you fill again with the expansion foam. If that doesn't stop the leak, excavate the other end in the spring and repeat the above. Then, pour bentonite around the entire end of pipe so it is completely encased in bentonite.
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Author:
Shoemaker2 (MA)
Use a couple tubes of pure silicone caulking and cover all that foam and seal everything to the pipe. Use a pair of latex gloves and cover them in dishwashing liquid so you can form the caulking to a nice neat capping, bounding everything together.
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Author:
LemonPlumber (FL)
You might wish to do it now during the dry season.Spring can be a little wet around here.If you had a longer delivery tube, on another can of foam o fill pushing it deeper into the pipe might help to stop the ground water flow.
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Good Luck. Insulate your hot piping, although costly, it will pay you back every day.
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Author:
North Carolina Plumber (NC)
That wire doesn't appear to be rated for underground use. The water is not good at all for that type wire.
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Author:
m & m (MD)
Looks like UF to me.
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Author:
CasualJoe (MO)
It appears to be and might be UF cable, but it's impossible to tell for sure from the picture. Regardless, the electrical installation is a code violation and was probably never inspected.
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