[Greenbuilding] Toxic Materials in Roof Runoff

futureship0000 futureship0000 at hotmail.com
Fri Aug 15 13:28:27 MDT 2014


John,

I have been researching best management practices (bmp's)
 for stormwater runoff.  With
Particular focus on small residential
Applications.  I attached a couple of documents that I found helpful.

So far raingardens, wetlands and bio-
Retention basins seem to be the
BMP of choice. However it is site
Dependent that determines the bmp.

My goal is to eliminate the stormwater
Run off monthly fee charged by Mecklenburg county (Charlotte, NC)
by implementing An approved bmp for stormwater management.

This is not my area of expertise but
I am trying to get up to speed ..

I am open to any suggestions on this
Very important subject! !!

I would be interested to hear from
Erin Rasmussen on his experiences
With the stormwater conference mentioned!

Thank you for all the great
Information this group freely shares!!!





<div>-------- Original message --------</div><div>From: John Salmen <terrain at shaw.ca> </div><div>Date:08/14/2014  11:20 PM  (GMT-05:00) </div><div>To: 'Green Building' <greenbuilding at lists.bioenergylists.org> </div><div>Subject: Re: [Greenbuilding] Toxic Materials in Roof Runoff </div><div>
</div>
Tall buildings...small roofs. Maybe Corbusiers vision of high buildings and
parks was not such a bad concept.  Meanwhile I think we are still trying to
figure out acid rain.

What is the state of the art for stormwater filtration and control and who
is becoming liable - especially long term contamination?

john

-----Original Message-----
From: Greenbuilding [mailto:greenbuilding-bounces at lists.bioenergylists.org]
On Behalf Of Erin Rasmussen
Sent: August-13-14 4:24 PM
To: 'Green Building'
Subject: Re: [Greenbuilding] Toxic Materials in Roof Runoff

I was at a stormwater conference.  I could have shared the studies that also
look at Copper and Zinc from cars, but it's the green building list.... so I
assumed you would prefer the one about roofs.

Copper and Zinc from roofs comes up quite a bit in stormwater run-off, and
the allowed limits here in the US have dropped quite a bit especially for
industrial permit holders.  In this context, understanding the contribution
to run-off from the roof material becomes more important,  especially for
businesses that have to cope with levels of Zinc flowing off their roofs at
levels that exceed the maximum levels.  Washington State Dept of Ecology has
several studies looking at sources of metal toxins, and also ambient
airborne toxics.

Part of the problem may be that fairly obvious point that metal dust from
cars doesn't stay on cars or roads, it can also become airborne and join a
variety of other airborne contaminants that stormwater managers, business
owners and others have to cope with. So the problem for city managers
becomes one of trying to determine the most effective methods of control. (I
just saw some really good statistical analysis of this from the city of
Tacoma, if anyone cares).

And you know, it's not just the folks in the US that worry about metals and
other pollutants in water....

 - Erin



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