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[Fwd: re: Muriatic acid Alternatives for masonry]



  This sounds like a safer solution--but I wouldn't wash it into a storm 
drain that flows directly to a surface water body without treatment.  As 
a reminder, all larger municipalities with separate sewer systems are 
subject to NPDES permit requirements for urban runoff, including water 
from cleaning activities.  Such permits prohibit discharge of pollutants 
including cleaning agents (even mild ones) into storm drains.  In areas 
with separate storm sewer systems, the wash water can be collected and 
pumped into the sewer system (this is easier than it sounds).

Kelly Moran
TDC Environmental

-------- Original Message --------
Subject: re: Muriatic acid Alternatives for masonry
Date: Fri, 5 Sep 2003 11:15:02 -0500
From: David Inman <dinman@norbic.org>
Reply-To: David Inman <dinman@norbic.org>
Organization: NORBIC
To: "Bechdel, Denise" <dlf14@psu.edu>



The City of Chicago is using a high pressure water and baking soda solution to surface clean concrete and brick. This is obviously an abrasive rather than chemical cleaning technique, but ther's no hazardous chemical worries, and it can be washed away so the clean-up is more sound than using grit. I don't know if it will give the same color restoration effect that muriatic acid does.

Try:

http://egov.cityofchicago.org/StreetsAndSan/StreetOperations/GraffitiRemoval.html

for a contact 

DRI
NORBIC
Chicago
===============================================================================================
 >>  Hello folks,

 >>  Does anyone know if there are any environmentally friendly cleaning
 >>  products
 >>  available to replace the use of muriatic acid on stone and brick surfaces?

 >>  Thanks
 >>  Denise Bechdel


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,

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