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Thread: Pool Dig - Struck Loose Gravel

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    Pool Dig - Struck Loose Gravel

    Hi

    During the dig of our DIY pool we have struck gravel, the gravel ranges from Pea Gravel to large rock the size of 2 fists all mixed also with some clumps of clay, when wet it moves easy, ie when I stood in it I sank about an inch as the gravel displaced around my feet. Now that it has dried it is fairly hard. This goes for about 1/2 the width of the pool to 1/2 the length of the pool. I didn't dig most of the hopper because of this, but now that it is dry I can finish off by hand (not looking forward to that) the rest of the deep end. The shallow end was solid clay the full width - so no issue there. It looks like the half end that I chose for the deep end was back filled many years ago as I also found broken bricks etc.

    So now that I have a huge hole in the yard, is this gravel mix an issue, can I construct the pool on top of this? I will have this inspected by local authorities on Monday so would like it fixed by the inspection if possible?

    Other than that the dig went fairly well, a little leveling but not too much, hopefully the kit will arrive this week and the inspection goes well I can start putting up the walls this weekend and bolting it all together.

    Thanks for any help.
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

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    pwrstrk's Avatar
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    Re: Pool Dig - Struck Loose Gravel

    If that's a hole that somebody buried junk I'd dig all that out and see how deep you are in relation to how deep you want it to be. If its deeper than you want then you can bring it up with some crushed stone and compacted in lifts.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    4knights's Avatar
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    Re: Pool Dig - Struck Loose Gravel

    Possibly an old oil tank that was removed and the hole filled in with gravel? County records would show any permitted work done on your property.
    Ron- Kansas. IG fiberglass, Riviera 30 Freeform 13600 gallons,
    EasyTouch 4 w/IC20 SWCG, Pentair Whisperflo 1hp, 2 speed 220 pump, Hayward ProGrid 4820 DE filter using Eco Klean instead of DE, 2 Savi Melody 12v 5 color LEDs, Raypack 266k btu millivolt heater, Arctic Armour Mesh custom safety cover (Total self Install) TF-100 test kit w/Magic stir.

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    Re: Pool Dig - Struck Loose Gravel

    I dug down the 6 feet already - its all the same. I think it is just fill, as we live in the edge of a slope, I think the slope was filled on the side to give some more area in the back before it goes down. I need to build a retaining wall as well. When you see the pics you will get a idea of my description.

    I will post some pictures in about an hour.
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

  5. Back To Top    #5

    Join Date
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    Central Massachusetts
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    Re: Pool Dig - Struck Loose Gravel

    It's not your septic leech-field is it??
    26,000 gal 18x36' IG Vinyl Pool - Hayward S244T Sand filter - Hayward Tri-star 2-speed 1.5HP pump - Goldline Aqua Plus SWCG and Controller with Tcell-15 - Aquacomfort 125K BTU Heatpump - Hayward Color Comfort 4.0 LED - Zodiac MX8 suction cleaner - TF100 test kit
    My Build thread

  6. Back To Top    #6

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    Re: Pool Dig - Struck Loose Gravel

    Here are some photos.
    the corner where the rocky gravel is, with a zoomed in shot so you can see the type of fill used - very deep with some very large rocks, I couldn't drive pegs into the ground here due to too many large rocks.
    Attached Images Attached Images
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

  7. Back To Top    #7

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    Michigan
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    Re: Pool Dig - Struck Loose Gravel

    Definitely not my septic, that is on the side of my house. (so I was told when I bought the house - plus can see the blocks that mark the top inspection points)
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

  8. Back To Top    #8
    4knights's Avatar
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    NE Kansas
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    Re: Pool Dig - Struck Loose Gravel

    What about a very wide shot? You said its on a slope that was filled, do you know how steep a slope? That will make a difference in how deep you have to go to stabilize the retaining wall.
    Ron- Kansas. IG fiberglass, Riviera 30 Freeform 13600 gallons,
    EasyTouch 4 w/IC20 SWCG, Pentair Whisperflo 1hp, 2 speed 220 pump, Hayward ProGrid 4820 DE filter using Eco Klean instead of DE, 2 Savi Melody 12v 5 color LEDs, Raypack 266k btu millivolt heater, Arctic Armour Mesh custom safety cover (Total self Install) TF-100 test kit w/Magic stir.

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    Michigan
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    Re: Pool Dig - Struck Loose Gravel

    Here sorry, only let me upload the three, so I just left it there.
    Attached Images Attached Images
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

  10. Back To Top    #10

    Re: Pool Dig - Struck Loose Gravel

    It's hard to tell for sure, but that slope looks like it might be a problem. You might want to get an engineer's opinion on a proper solution to make sure that everything is stable.

  11. Back To Top    #11

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    Michigan
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    Re: Pool Dig - Struck Loose Gravel

    The retaining wall people coming this week - there was one there previously but it was all rotten and eaten by ants. Wanted to replace it with concrete
    Currently installing new pool into new home.
    16x32 Steel Walled, Vinyl, 4ft to 6ft depth
    Hayward SWG, Aqua 4 Plus
    Hayward 1.5 HP Pump
    Hayward Cartridge Filter
    Heater - Not Decided yet.

  12. Back To Top    #12
    4knights's Avatar
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    NE Kansas
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    Re: Pool Dig - Struck Loose Gravel

    Definitely want an engineer on this one!! That slope with any form of ground water or even rain runoff could be disaster for the pool (and anyone in it, if it let go)
    Not saying it can't be done, Ive seen very nice concrete retaining walls at were 30ft tall.
    My parents have a 15 ft tall retaining wall made of tires that has held for 40 years. (man that was a pain packing dirt and rock into those things!)

    So structurally it can be done. Just want to make sure it's engineered and the builder has a great warranty.
    Ron- Kansas. IG fiberglass, Riviera 30 Freeform 13600 gallons,
    EasyTouch 4 w/IC20 SWCG, Pentair Whisperflo 1hp, 2 speed 220 pump, Hayward ProGrid 4820 DE filter using Eco Klean instead of DE, 2 Savi Melody 12v 5 color LEDs, Raypack 266k btu millivolt heater, Arctic Armour Mesh custom safety cover (Total self Install) TF-100 test kit w/Magic stir.

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