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  #21  
Old 10-17-2012, 04:02 PM
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Rotor_Tool Rotor_Tool is offline
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Quote:
Originally Posted by White Gardens View Post
I want to know what the water is going to be used for.

I wouldn't think potable water considering it will be gathering nasty stuff off the parking lot.

On a side note, I've been pushing cistern installs for people this year after the nasty drought we had.



.......
Water will be used for irrigation at the site.
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  #22  
Old 10-17-2012, 04:04 PM
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Originally Posted by hoskm01 View Post
This is Arizona, it won't be used for potable and certainly not off of a parking lot.

Landsacping most likely, maybe grey toilet water flush, but even that is an act of god to get passed and approved.

Rotor-tool- You on the install or just happen to see it? Looks like you have some exclusive site access. Nice project. What type of business?
Yes, I am onsite. This is for a new Walgreen's store.
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  #23  
Old 10-17-2012, 04:10 PM
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Are the tanks secured to a concrete slab with stantions similar to horizontal fuel and propane tanks?
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  #24  
Old 10-17-2012, 04:18 PM
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Originally Posted by 1idejim View Post
Are the tanks secured to a concrete slab with stantions similar to horizontal fuel and propane tanks?
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There are concrete deadmen/straps anchoring the tanks in place.
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  #25  
Old 10-17-2012, 04:21 PM
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Mike Leary Mike Leary is offline
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Mine don't get parking lot runoff, but it is amazing how much gunk collects in the bottom after a few years. We have the septic boys pump them. My comment about fibre cisterns was that special backfill gravel was used on the OUTSIDE of the tank while the tank was being filled. They don't like being dry, which is prolly the reason for more stringent anchoring, such as concrete in certain areas.
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  #26  
Old 10-17-2012, 09:18 PM
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I believe the term for backfilling a plastic cistern is "granulated spoils".
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  #27  
Old 10-17-2012, 09:27 PM
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Quote:
Originally Posted by Mike Leary View Post
I believe the term for backfilling a plastic cistern is "granulated spoils".
do you use a matrix or fabric to contain and separate the native from the specialized backfill material?
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  #28  
Old 10-17-2012, 09:42 PM
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Mike Leary Mike Leary is offline
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Quote:
Originally Posted by 1idejim View Post
do you use a matrix or fabric to contain and separate the native from the specialized backfill material?
No, and I understand what you're saying. We've done that with curtain drains, but, the plastic cistern must be kept filled, otherwise it will prolly rise and/or shift, no matter what.
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  #29  
Old 10-18-2012, 02:20 PM
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Quote:
Originally Posted by 1idejim View Post
do you use a matrix or fabric to contain and separate the native from the specialized backfill material?
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We are separating backfill from native soil with landscape fabric wrap. The hole is lined, tank set, backfilled, then wrapped like a huge burrito, then native soil goes back in for the remainder of the excavation.
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  #30  
Old 10-18-2012, 03:50 PM
Mark Oomkes Mark Oomkes is offline
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So doesn't the oil, gas, antifreeze, etc cause issues with the plant material after time?

There's a local medical center that was going for some sort of LEED cert that was going to use all the runoff from the lot for irrigation. Someone asked them what about all the salt that is applied during the winter collecting in these tanks, being applied to turf and plants.

You could have heard a pin drop.
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