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Putting The Waste Treatment Plant In.

Posted by ProDave , 01 November 2015 · 1,462 views

This weekend was a big job i have been wanting to do all year, but it involves the deepest excavation on site, and with our high water table that demands dry conditions. The summer got off to a very wet start so it wasn't possible then, and then it all became too hectic with the builders building. So I was running out of time to get it done this year, and since it has been quite dry for a while, the warter table is probably as low as it's been all year. So now or never.

This is the beast, a Conder ASP6, 6 person treatment plant. One of the best in terms of effluent quality, and one that works on the air blower principle

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Everything ready for a busy weekend:

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Everything started well on Saturday morning. Digging was going well. No particularly big rocks in the way. Almost down to the required depth, then I noticed the boom on the digger had gone all floppy. Stop to investigate revealed the pin on which the boom swivels had snapped and the boom was only attached on one side

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that threatened to halt the job, but I didn't want to leave such a deep hole open and unfinished, I know it would fill with water, and the sides would start to collapse in. So some quick thinking to find a bodge solution to keep the job going.

the only bit of metal anywhere near big enough that I could immediately find was a steel jumper bar, so that was pressed into service and I carried on cautiously

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The hole got quite deep. It's hard to see what you are doing with the digger at virtually full reach down into the ground

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Eventually we were deep enough t lift the treatment plant into the hole. Well it's never that simple and it was in and out of the hole about 4 times until it was finally at the right depth and orientation and importantly, level.

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So by mid day on Saturday the tank was in the hole in the correct place

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Then the hard work started. Mixing concrete. Saturday afternoon and all day Sunday was spent mixing, barrowing and pouring concrete down the hole to set the bottom of the tank up to the retaining ring into a big block of concrete. Something in the order of 6 tons of concrete now sits in the bottom of the hole to anchor the tank down.




recoveringacademic
02 Nov 2015 07:49 AM
Thanks Dave. Water table..... something I had not even begun to think of. And the amount of concrete necessary. Did an SE need to calculate the amount of concrete, or does the supplier know how much will hold the thing down?
Anyway thanks. This was a big help.
Ian
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When we built our last house I didn't know about such things, and the contractor just set our septic tank in pea gravel. then I witnessed the mishap of a friend nearby when his treatment plant floated out of the ground during a wet spell. So at my present house I will only ever get the tank desludged during a long dry spell when I can be sure the water table is low.

Different tanks have different ways of anchoring them down, most will supply a ground anchor kit if needed. In this case all that's needed is to encase the ring around the bottom in concrete. I just hadn't realised how much concrete needed to go in the hole to get to that level.

Think myself lucky I didn't need to bury it deeper and use a neck extension, the instructions say to encase the whole thing in concrete then.
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I take it the retaining ring is the one approx 1/4 o the way up from the pointed base?
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That hole has got me worried for our 12 person treatment plant... in fractured granite. Something tells me the holes going to be more expensive than the treatment plant!
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I don't envy you the task of digging that one. I think you might need a bigger machine with a breaker on it.
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Rather than a conical treatment plant installed in rock, how about a low profile treatment plant?
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Interesting subject as I too have a very high water table ( in winter can be 6" below ground level!). I would consider a low profile unit and would like to hear of anyone else that has looked into such an animal.
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