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Thread: quick sand used as fill

  1. #1
    Join Date
    Feb 2012
    Location
    Welland Ontario
    Posts
    397

    Default quick sand 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 setttling I need more soil brougt in anyway.
    Operation Overlord.

  2. #2
    Join Date
    Jan 2013
    Location
    North Caroilna
    Posts
    19

    Default

    Is it currently wet ?

  3. #3
    Join Date
    Feb 2012
    Location
    Welland Ontario
    Posts
    397

    Default

    Yes. The trench they dug for the pipe and tank is in solid clay so it acts like bathtub to hold the water. Very poor drainage.
    Operation Overlord.

  4. #4
    Join Date
    Jan 2013
    Location
    North Caroilna
    Posts
    19

    Default

    Then you answered your own question. If the replacement fill was sand and it's surrounded by clay your absolutely correct in the fact that they created a bath tub full of sand. The worst part is the only two solutions are either a drain out of the tub or replace the sand with a more compact fill. Even if you remove half and fill on top with compact soil it will still feel squishy under foot after rain.

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