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My building has a septic tank which is at the bottom of the groundfloor. Basically it's right underneath the building and it has open bottom.

I'm worried if this can weaken the soil (Clay ground) leading to weakening of building foundation.

Is it a problem ? if yes , what are the solutions we have to keep in mind.

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    So after all the questions yesterday, you now find out there's a septic tank under the building?
    – JACK
    Oct 13 at 22:20
  • How old is the building?
    – JACK
    Oct 13 at 22:20
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    I think you need to hire some professionals rather than asking tons of broad questions Oct 13 at 22:47
  • No, not if you have a basement and the groundwater has raised above the original elevation it was designed for. Groundwater fluctuation has minimal effect on the spread footings, except overdrawn the groundwater that causing the soil to consolidate (settle). I assume your building has a footprint of 120'x40', for every day it releases 70 cf of wastewater, then assume the ground does not absorb any of the released water, the groundwater will raise 70*12/(120^40) = 0.175" per day, or 1' per 68 days. Please check with an engineer to relieve your anxiety.
    – r13
    Oct 14 at 1:21
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Without soil cores and information on elevation changes, we don't know if it's a problem or not. If it is a problem, you could install another septic tank away from the building. If you're sure it's open bottom, you could add one.

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  • Soil is complete clay and it's plain land like it has farm fields near by. The ground water table is at 8 feet.
    – RaviMan
    yesterday
  • When you say , if its open bottom then I could add one ? what's the meaning , you mean to say that I could add one more septic tank below the current one and seal the bottom with concrete
    – RaviMan
    yesterday
  • @RaviMan We can't determine if there's a problem. If there is a problem, you could install a septic tank away from the house. You don't really have a septic tank, you have a septic pit. You could get someone to add a floor to it , making it a tank.
    – JACK
    yesterday
  • The problem is I don't have extra space either to have seperate septic tank but just wondering whether the septic pit would cause some issue like weakening the foundation
    – RaviMan
    15 hours ago

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