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Old 05-04-2015, 06:55 PM   #1
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Quicksand used as fill


I had a new sewage holding tank installed last fall. They brought in some fill to level everything out. In some places it was 2-3 feet thick. Problem is I think this stuff was quicksand. I can take a 2x4 and push it in until I hit the original clay bottom 2 feet down. I even tried walking on it in bare feet and sank up to my knees. It was kind of funny as didn't expect that level of softness. It looked like nice sandy stuff when they brought it and it was dry.
The question I have is, does it need to be removed or will it solidify if I cap it with 3-4 inches of better soil and plant grass? Do to winter settling I need more soil brought in anyway.
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Old 05-15-2015, 02:43 PM   #2
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If it has a clay bottom and doesn't drain it may stay soft. Is it saturated with water? I wouldn't put anything on top of it until it solidifies.
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Old 05-15-2015, 03:02 PM   #3
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I would say you're only asking for problems by using it .even if you give it the time to solidify it will not be a good base for anything.
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Old 05-15-2015, 04:01 PM   #4
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Quote:
The question I have is, does it need to be removed or will it solidify if I cap it with 3-4 inches of better soil and plant grass? Do to winter settling I need more soil brought in anyway.
Ayuh,..... How much material ya bringin' in,..??

What sorta Equipment is gonna be involved,...

Rather than exportin' the sand, it can be mixed into the clay, 'n soils,....

Sounds like the sub-grades shoulda be graded, Before it was filled, insteada just fillin' the holes,.....
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Old 05-15-2015, 04:40 PM   #5
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Fill a pint or quart jar about 2/3 full of the sand in question and top it off with water until the jar is full. Shake vigorously for a few minutes, leave set over night then see what you have.

The sample may need to be taken to a soils engineer to determine what you have.
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Old 05-15-2015, 10:59 PM   #6
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Quick sand is basically round where regular sand has jagged edges that will catch on each other.
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