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Re: FW: Sandblasting vs. Acid washing concrete

In Northern California we're seeing a lot of people switching to water-based
cleaning methods where possible to avoid generating hazardous waste.  Typical
methods include pressure washing (which can be quite powerful--for example it
can remove many layers of paint from a building) and steam cleaning.  While such
methods involve substantially reduced hazards, the wastewater still can pose a
significant impact to surface waters and thus is typically illegal to discharge
to a storm drain (except in very narrow circumstances where nothing but water is
used, no material other than surface dirt is being removed,  loose material is
swept up first, and oil and other spills are pre-cleaned).  Relatively simple
methods exist to collect wastewater from such cleaning operations for treatment
or sewer disposal (assuming it meets local discharge limits).

Kelly Moran
TDC Environmental

"Moscato, Doenee L USAEC" wrote:

> 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