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396 posts

Ultimate Geek
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Topic # 215082 11-Jun-2017 19:47
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Well, construction on the Metro Sports Centre is scheduled to start by mid 2017 or quarter two, depending on which article or official placard you read.


Looking through the fence today I saw big piles of top soil covered with plastic & some large and small ponds.    Presumably the piles of topsoil are from the cleanup of contaminated soil after the demolition of buildings found to have asbestos.    No sign of any building work yet.    The soil seems to have come from the area where the two large ponds are.


The photos show some small and large ponds.    The brewery was built there to take advantage of the the natural springs or so Grizz Wylie said in the tv ads.


In the 2011 earthquake some buildings with cracked floor slabs were said to have had water bubbling up through the cracks.     All this information can be found quite easily in the comments made on the Stuff.co.nz articles about the delays to the project.


So my question is how will the ground be remediated & how long will it take?    I will try to upload some photos.






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1274 posts

Uber Geek
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  Reply # 1798165 11-Jun-2017 20:06
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Building a jet sprint course?



396 posts

Ultimate Geek
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  Reply # 1798170 11-Jun-2017 20:12
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I should add that Christchurch has not had a lot of rain in the last two weeks.    A few mm here and there.    So to me it looks like those natural springs might be bubbling away under most of the site...


 
 
 
 


220 posts

Master Geek
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  Reply # 1798171 11-Jun-2017 20:13
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Isn't it meant to have a pool or two in the new Centre.


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Uber Geek
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  Reply # 1798172 11-Jun-2017 20:13
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That's rainwater - not groundwater/water table related. It's been wet in Chch for the past weeks - beautiful weekend now.

 

If you don't like the project - that's one thing.

 


Arguing that there's some reason it's flawed technically - when all the evidence I've seen of what's going on with the major anchor projects in Chch indicates that they're so cautious to ensure that they've covered everything - it's not a winning argument.




396 posts

Ultimate Geek
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  Reply # 1798177 11-Jun-2017 20:32
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Fred99:

 

That's rainwater - not groundwater/water table related. It's been wet in Chch for the past weeks - beautiful weekend now.

 

If you don't like the project - that's one thing.

 


Arguing that there's some reason it's flawed technically - when all the evidence I've seen of what's going on with the major anchor projects in Chch indicates that they're so cautious to ensure that they've covered everything - it's not a winning argument.

 

 

 

 

You may well  be right.   However, the 2nd photo looks awfully like the areas near the Travis Wetlands that slumped.    This Metro site looks a lot wetter than other bare building sites around the central city.     Let's see if the ponds dry up with some better weather!


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Uber Geek
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  Reply # 1798311 12-Jun-2017 09:16
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This PDF includes pre/post levels measured by LIDAR.  Not very high resolution - but you can see the area and it doesn't look like levels shifted much at all.  OTOH you can see the Travis Wetlands area etc slumped significantly.

 

http://cera.govt.nz/sites/default/files/common/tonkin-and-taylor-land-damage-presentation-ccc-area-23-june-2011.pdf

 

I believe that most of the worst affected areas for subsidence, lateral spread, and liquefaction were areas that in the past had been "inside" loops of the Avon as it meandered, including areas inside bends which had become oxbow lakes.  The river deposited fine silts, the water table was high, with a bit of a shake (understatement) it separated and turned to slush.  Many of those areas are the residential red-zone. 

 

I doubt that's asbestos contaminated soil stockpiled.  Perhaps it's just hard-fill from the demolished buildings - if they're going to need some for the project then perhaps a waste to cart it and dump, then pay to cart more back.  I guess that area is possibly close to or below 100 year (or whatever they're going to have to use) flood levels, so unless they find some other way of mitigating the effects from future floods, building up the ground before constructing on it may be needed.

 

 




396 posts

Ultimate Geek
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  Reply # 1802659 17-Jun-2017 17:30
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Exactly a week on, and a week of fine weather, those ponds look the same.    Three wading sea birds were busy at the shallow western pond!

 

I also had a look at the Convention centre site yesterday and the major activity seemed to be drainage work.    A company called Water Wells had a massive piece of plant in there at the N/W corner and there was a nice little stream (about a metre wide) leading down to a very large & deep pond on the S/E corner of the site.     I saw two engineer type people looking at the little stream & they had puzzled looks on their faces.

 

Now, this is speculation on my part, but I'm thinking there may no progress on the Metro Sports site until all the drainage work on the Convention Centre site is done.    I'm assuming that the same contractors may have both jobs?    It all looked like very specialised and expensive plant at the Convention Centre site.

 

The ground works at the convention centre site look nothing like what was done at the new Novotel hotel site at the airport.    This is not surprising of course but expected work can sometimes throw up unexpected challenges and delays...


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Uber Geek
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  Reply # 1802664 17-Jun-2017 17:43
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The slabs that cracked after the EQs, which had water bubbling up would have been from the liquefaction at the time of the earthquakes, as well as after the aftershocks, as the water gets forced up from the ground movement. So I don't think the water in the ponds is related to that. I guess they have engineers that will solve any problem. Will probably require deep foundations to get good ground bearing. You can build buildings on top of water logged areas. A lot of wellington buildings are. Some buildings basements are even below the water table in Wellington, have have pumps . The weight of some buildings also help to keep the basements, underground. 


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