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FW: Sandblasting vs. Acid washing concrete



Other input?

-----Original Message-----
From: Moscato, Doenee L USAEC 
Sent: Friday, August 06, 1999 9:56 AM
To: 'owner-usgbcmembers@crest.org'; 'usgbcmembers@usgbc.org'
Subject: RE: Sandblasting vs. Acid washing concrete


Neither is more or less impact, depending on what you're removing from the
concrete and how you're collecting/controlling the applied media.  In some
applications, microbial solution could be used.  More info is required to
select the best method.

Doenee L. Moscato
U.S. Army Environmental Center
Pollution Prevention/Environmental Technology Division
Pollution Prevention Branch
(410)436-1228
DSN 584-1228




-----Original Message-----
From: Elizabeth Daniel [mailto:ElizabethD@seattlechamber.com]
Sent: Thursday, August 05, 1999 7:19 PM
To: 'usgbcmembers@usgbc.org'
Subject: Sandblasting vs. Acid washing concrete


Fellow members,

Here is a technical assistance question I received that is out my range of
expertise.  I was wondering if anyone else had thoughts on it.

"Which would have the least impact on water quality (considering that many
salmonid species have been listed as endangered or threatened in the Pacific
Northwest)  sandblasting concrete or acid washing it?"

This is the only response I could give:

"I'd have to get more information to really answer that one.  On the surface
sandblasting sounds more benign but I happen to know there are a lot of
heavy metals and free silicates wastes from it, therefore I'd say they are
both pretty harmful.  Either one should be done so no wastes enter the water
cycle.  If one had a better process for catching the wastes I'd pick that
one.

There is one company that makes a sandblasting product out of recycled glass
which also happens to have no free silicates.  It might also be free of
heavy metals, so maybe that is your answer.

Maybe the USGBC list serve could tackle that one."

Any acid washing/sandblasting specialists out there?


Elizabeth Daniel
Program Manager
Business and Industry Recycling Venture
Greater Seattle Chamber of Commerce
1301 5th Ave. Ste. 2400
Seattle, WA 98101-2603
(206) 389-7281
(206) 903-3431 - fax
elizabethd@seattlechamber.com

Visit our web page at http://www.seattlechamber.com/birv


----------
Juna Z. Snow
List Manager
Waste Management & Research Center
listman@wmrc.hazard.uiuc.edu
217.333.8945