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Joined: Aug 2020
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Jim N. Offline OP
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Hello and I am relatively new to the forum. I have a 5-6 Acre lake I am planning on my property. Before I spent any money moving dirt I wanted to get some real analysis done. I hired a geo-technical engineering firm to core sample the lake site as well as a future home site. I guess the good news is that the area is notorious for thick clay deposits and the sampling seemed to confirm that.

Several holes were dug to 25' and from that I can see the soil condition is heavy clay (CH) well past my 25' sample. I intend to have a lake depth of about a dozen feet or so so I hope this works. One thing that confused me was they took a surface soil sample (several) and ran a conductivity test on this. From what I understand the conductivity of the surface is 6.3e-8. I have no clue what this means and tried to understand it a bit better. I have a call into the Geo Engineering team to help me decipher this but thought I would ask here as well.

I read some information that conductivity of under 1-e9 is considered good for holding water. My surface material at least does not meet those conditions. However the plasticity of the clay is in the mid 50's to over 70 if we go deeper. Will i have any issues if that plastic material is spread in a nice thick layer across the entire lake bottom and sides?

Location is south Bastrop County Texas. Further north of me is a black clay soil while most of mine is brown, orange and black in spots. Anyone have suggestions on what questions to ask the Geo firm?

BTW - The watershed has plenty of area to fill this lake. I think we figured it to be 700 acres so obviously a wide spilway that goes around the lake is part of the plan.

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Archive for soil and water tests

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92617#Post92617

Can you post your results ?

Also archive on pond building

https://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=92487#Post92487

Surface dirt is usually moved away for top spreading and the pond bottom is clay mix.

Last edited by ewest; 02/05/21 12:56 PM.















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Don't forget the Mike Otto clay test - form a handful of wet clay into a lump and throw it onto the side of your pickup truck. If it sticks, it's good for sealing a pond.

This also includes the implication that if you want a pond in Texas, you should have a pickup truck.


"Live like you'll die tomorrow, but manage your grass like you'll live forever."
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Originally Posted by Theo Gallus
Don't forget the Mike Otto clay test - form a handful of wet clay into a lump and throw it onto the side of your pickup truck. If it sticks, it's good for sealing a pond.

This also includes the implication that if you want a pond in Texas, you should have a pickup truck.

I'm an Aggie. I throw that mudball at my neighbor's truck.

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If they don’t have a pickup, they’re a galvanized Texan


It's not about the fish. It's about the pond. Take care of the pond and the fish will be fine. PB subscriber since before it was in color.

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