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John,
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<div>I have been researching best management practices (bmp's)</div>
<div> for stormwater runoff. With </div>
<div>Particular focus on small residential</div>
<div>Applications. I attached a couple of documents that I found helpful. </div>
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</div>
<div>So far raingardens, wetlands and bio-</div>
<div>Retention basins seem to be the </div>
<div>BMP of choice. However it is site </div>
<div>Dependent that determines the bmp.</div>
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<div>My goal is to eliminate the stormwater</div>
<div>Run off monthly fee charged by Mecklenburg county (Charlotte, NC)</div>
<div>by implementing An approved bmp for stormwater management. </div>
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</div>
<div>This is not my area of expertise but </div>
<div>I am trying to get up to speed ..</div>
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<div>I am open to any suggestions on this </div>
<div>Very important subject! !!</div>
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<div>I would be interested to hear from </div>
<div>Erin Rasmussen on his experiences</div>
<div>With the stormwater conference mentioned! </div>
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<div>Thank you for all the great </div>
<div>Information this group freely shares!!!</div>
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<div>-------- Original message --------</div>
<div>From: John Salmen <terrain@shaw.ca></div>
<div>Date:08/14/2014 11:20 PM (GMT-05:00) </div>
<div>To: 'Green Building' <greenbuilding@lists.bioenergylists.org></div>
<div>Subject: Re: [Greenbuilding] Toxic Materials in Roof Runoff </div>
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<div class="BodyFragment">
<div class="PlainText">Tall buildings...small roofs. Maybe Corbusiers vision of high buildings and<br>
parks was not such a bad concept. Meanwhile I think we are still trying to<br>
figure out acid rain.<br>
<br>
What is the state of the art for stormwater filtration and control and who<br>
is becoming liable - especially long term contamination?<br>
<br>
john<br>
<br>
-----Original Message-----<br>
From: Greenbuilding [<a href="mailto:greenbuilding-bounces@lists.bioenergylists.org">mailto:greenbuilding-bounces@lists.bioenergylists.org</a>]<br>
On Behalf Of Erin Rasmussen<br>
Sent: August-13-14 4:24 PM<br>
To: 'Green Building'<br>
Subject: Re: [Greenbuilding] Toxic Materials in Roof Runoff<br>
<br>
I was at a stormwater conference. I could have shared the studies that also<br>
look at Copper and Zinc from cars, but it's the green building list.... so I<br>
assumed you would prefer the one about roofs. <br>
<br>
Copper and Zinc from roofs comes up quite a bit in stormwater run-off, and<br>
the allowed limits here in the US have dropped quite a bit especially for<br>
industrial permit holders. In this context, understanding the contribution<br>
to run-off from the roof material becomes more important, especially for<br>
businesses that have to cope with levels of Zinc flowing off their roofs at<br>
levels that exceed the maximum levels. Washington State Dept of Ecology has<br>
several studies looking at sources of metal toxins, and also ambient<br>
airborne toxics. <br>
<br>
Part of the problem may be that fairly obvious point that metal dust from<br>
cars doesn't stay on cars or roads, it can also become airborne and join a<br>
variety of other airborne contaminants that stormwater managers, business<br>
owners and others have to cope with. So the problem for city managers<br>
becomes one of trying to determine the most effective methods of control. (I<br>
just saw some really good statistical analysis of this from the city of<br>
Tacoma, if anyone cares). <br>
<br>
And you know, it's not just the folks in the US that worry about metals and<br>
other pollutants in water.... <br>
<br>
- Erin <br>
<br>
<br>
<br>
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