Fouling the Watershed

About: Renton Concrete Recyclers


Renton Concrete Recyclers is allowing runoff from their facility to spill out on the soil near the Black River Riparian Forest.   Rain water filters over their facility, collects in a drainage pool, flows into a pipe under the road into a second drainage pool where a pipe leaks it down along the railroad tracks adjacent to the forest.  Now concrete recycling is better than making it from scratch and these are "the good guys", but i just think that they should fix that leaky pipe.

I have one question about the physics of the situation:  Why is the first drainage pool green, yet the second and final pools are very white?  Are the fine particles of concrete "skimmed" off the top before they can settle? 

More in my album Renton Concrete Recycling

Update 9/29/2007  Apparently they are going to fix this ...



... but how?  According to my understanding they cannot discharge runoff from concrete into the storm water system.   Stay tuned ...

Tags

  1. concrete recyclers
  2. water pollution
  3. my photos
  4. concrete
  5. gm

Comments


Seth says
M 2007-08-30 09:21:31 7947
I suspect it is a gravity thing. Factors are like the amount of water in each pool, the origin of the algae etc.  It would be unusual for someone from the company to skim stuff from the polution stream unless there is so much concrete that it fills up the first level pool & they need to have the pool flowing. The question amongst all the factory runoff environmental damage is why does the factory have to do it in the first place?  Is there another way to move the unwanted byproducts of manufacture to a safe location which is environmentally sound?


Well part of the physics i understand.  Look at the site in Google maps which shows it some some years ago.  Back then the first drainage pool was much larger.  What happened is that they subdivided the pool when they built that asfault road for the Sunset Bluff development. When they made the road they put that large pipe under it from the first part of the pool to the second part of the pool.  This was necessary otherwise the first pool would just overflow the road.   A simular arrangement was made between the second pool and the ineviatable last resort in the ditch along the rairoad tracks.  The problem is in that corregated pipe sticking up in the second pool.  The purpose of that pipe is probably to limit the height of the second part of the pool.  If everything worked as it was intended, then the water would only get up that high very rarely.  But there is a leak in the corregated pipe below water level under that mound of gravel so that it always leaks down into the ditch on the other side of the berm.  It seems to me that it would be an easy piece to just install a pipe there that did not leak. 

This is not "unwanted byproducts of manufacture" ... this is just simple rain water runoff from a very large site.  Unfortunately it contains particles from the breakdown of concrete.  The stom water has to go somewhere and they are prohibited from discharging it into the sewer. 

Seth says
When drainage from a "construction" site is handeled professionaly it can be a very elaborate affair.  Below is what they are doing at the construction site of the 3rd runnway at SeaTac.

From Renton Concre...

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