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Old 04-22-2015, 04:00 PM   #1
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hole in lawn near septic tank.


I've noticed soft spots before but today when mowing I stomped down and my foot went in the ground about 4-5". I kept pushing and you can see the area where grass sunk.

This us near the end of my concrete septic tank. There are no tunnels like moles make in my back yard. This part of Fla doesn't have many sinkholes.

I pushed a tomato stake in the hole and it went down 16" in a couple of spots. Its not wet and doesn't stink.

Any ideas?
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Old 04-22-2015, 04:11 PM   #2
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Start digging and see what is going on. Could be your tank has failed.
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Old 04-22-2015, 04:13 PM   #3
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If it was mine I would start digging until I found the problem. Is this a fairly new tank? It could just be ground settling. That would be an easy fix.
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Old 04-22-2015, 04:18 PM   #4
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Joed,
Wouldn't I have some kind of trouble, like with drains in the house, or bad odors outside?

This is at the far end of the tank, opposite where the guy opened it to pump it when I moved in. ( 3 yrs ago).

Im able to start digging, but I'm a little afraid.

What would I look for?

Jim,
Its 31 yrs old and there are no trees roots nearby and I had a man who's been in the business for 50 yrs inspect it and he said it was a good concrete tank.

Last edited by Startingover; 04-22-2015 at 04:21 PM.
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Old 04-22-2015, 04:41 PM   #5
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Ayuh,.... Yer lookin' for a broken pipe, as the dirt falls into it, 'n is carried away by the effluent, hence yer hole,...
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Old 04-22-2015, 07:08 PM   #6
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Bondo.
Ok, Ill call the Septic Co, I used to drain the tank, an see who they recommend.

Hope it doesnt cost much.

Now if one spot broke hope other spots don't break.
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Old 04-22-2015, 09:01 PM   #7
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Fill the hole with #2 rock just below the grass line and see what happens. may just be a gap around the septic tank cavity sinking common problem keep an eye on it.
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Old 04-22-2015, 10:24 PM   #8
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My lawn looks like it has a belly button.

Javiles,
Ok, I'll buy some gravel an try that.
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Old 04-23-2015, 06:38 AM   #9
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Ayuh,.... You say it's 31 years old,..?? That's not settlement, but a Problem,....

Just fillin' the hole, will lead to more stone, 'n soil fillin' the leach field,....
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Old 04-23-2015, 06:46 AM   #10
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Filling will not fix the real problum.
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Old 04-23-2015, 12:36 PM   #11
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Ok, I'll dig down a little.
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Old 04-23-2015, 01:35 PM   #12
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Tell someone to watch while you dig just in case it is one of those Fl sinkholes. We don't want to lose a forum member. Better yet, tell someone to dig while you watch.
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Old 04-23-2015, 06:25 PM   #13
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LOL,
Seriously, I think thats what scares me.

A couple of yrs ago a man, over near Tampa, was sleeping in his bed an a sink opened and swallowed him. His brother ran in and just saw his arm disappearing down the hole.

I'm going to call someone and if it costs to have them investigate the hole I'll do the digging then.
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Old 04-23-2015, 08:33 PM   #14
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If you know the depth of your tank lid- thats how deep you'll probably need to dig- plus a tad more to the outlet pipe....
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Old 04-24-2015, 05:59 AM   #15
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Heres a photo from 3 yrs ago when the inspector marked the tank with white flags and drainfield with yellow flags.

When I watched the tank being drained I'd say its the depth of the tomato stake I poked down, about 18"

From the white flags, now it looks like the hole is on the side of the tank away from the drainfield.

hole in lawn near septic tank.-image.jpg

Last edited by Startingover; 04-24-2015 at 06:15 AM.
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