Re: Concrete Demolition

["Spell, Bill" <bills@deq.state.la.us>]

I'm sure you've already thought of it, but don't forget to evaluate the need 
for personnel doing the work using respiratory protection!

Bill Spell
bills@deq.state.la.us

 ----------
From: radsafe
To: Multiple recipients of list
Subject: Re: Concrete Demolition
Date: Wednesday, July 17, 1996 10:58AM

Date:          Wed, 17 Jul 96 09:58:54 -0500
Reply-to:      radsafe@romulus.ehs.uiuc.edu
From:          kg1@cosmail1.ctd.ornl.gov (Kurt Geber)
To:            Multiple recipients of list <radsafe@romulus.ehs.uiuc.edu>
Subject:       Concrete Demolition

Does anybody in radsafe have experience controlling airborne contamination
generated by an electric jack hammer?  We're planning to use a "Bosch
electric breaker hammer" to decontaminate about 15 sq. ft. of Cs-137 and
Sr-90 contaminated concrete inside a building.  Based on core sample results
we're going to remove the top  1" from a 12" thick slab.  Of course we'll be
using respitory protection, but we don't want spread contamination to the
adjacent lesser contaminated areas so we want some engineered control for
the dust. I really don't have time to experiment on clean concrete with
various size HEPA vacs.  Any practical advice is appreciated.  Thanks in
advance.


**********************************************
        Kurt R. Geber
        Lockheed Martin Energy Research Corp.
        Oak Ridge National Laboratory
        P.O. Box 2008
        Oak Ridge, TN  37831-6160

        Internet:       kg1@ornl.gov
        Phone:          423-574-0929
        Fax:            423-241-2779

Kurt,
There are devices available, called concrete scabblers, which are
equipped with concentric vacuum hoses which might be able to remove
that first inch of concrete and simultaneously eliminate or at least
significantly reduce airborne material.  The device blasts the
surface with steel shot to "wear away " the concrete.  A vacuum hose
which surrounds the shot delivery hose, pulls up shot, concrete
particles, pebbles, etc.

Good luck,

             ***************************************
               Russ Meyer
               Internet: cmeyer@brc1.tdh.state.tx.us
               tel: 512/834-6688 


               fax: 512/834-6654
             ***************************************