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Septic tank question...

A

Anonymous

Guest
...regarding a dried out cement septic tank that was used as a holding tank for an outhouse that has been abandoned for at least 50 years. Why would there be a layer of clay approximately a foot and a half thick under an 8" layer of very compact humus?
Would this layer of clay be formed by a natural decomposition (maybe with lyme) and settling of the sludge like silt as the tank dried out? Would someone maybe have poured a layer of clay in to try to plug a cracked and leaking tank?
Any ideas or suggestions appreciated.
BTW, this is a hypothetical situation... please don't ask <img src="/metal/html/biggrin.gif" border=0 width=15 height=15 alt=":D">
 
There is an old church, long since abandonded, which has a septic tank with about 10 inches of dirt in the bottom. I think it is the result of decomposition of the contents. It is now pure dirt.
And yes, I did scan it and picked up one silver ring and a fair bit of coinage.
All the best
Sunny skies
M
 
That "clay"is the solids that settled out over time and use.That"humas" is anything that would decompose over time- T.paper,newspaper,paper cups,etc. and could not drain off because the water level was too low. <img src="/metal/html/confused.gif" border=0 width=15 height=22 alt=":?">
 
...was there a layer of "clay" at the bottom of yours as well?
 
...Makes sense if the tanks were full of water. I guess I was expecting pure rich dirt all the way down.
 
If it was a shallow well, and a pump, they tend to pick up bits of clay and put it throughout the system, the bottom of the hot water tank, toilet tank etc. Over many years, that could account for some of the accumulation.
 
maybe that clay came in as a clay sludge, during a flood in time past. It would take a lot of it but once the water had run off, a layer of clay would have been left.
Look uphill from the tank and see if there is a bunch of clay up there and if so, I bet that is what happened. A bunch of clay water washed in, during some downpour and filled it up. When the water ran off, the clay was left
 
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