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Those performing the work will need to have the silica hazard
training. They will need to do the paperwork.<br>
<br>
The Hall B techs drilling the holes will be required to use a vacuum
cleaner to prevent contaminating the clean room with fine dust. This
also eliminates the silica hazard.<br>
<br>
We have drilled many many holes in the clean room floor since 1993.
You will find that there are no utilities in the floor, just rebar.
Perhaps the permit is still valid from the DC construction project.<br>
<br>
<div class="moz-cite-prefix">On 11/7/2016 11:27 AM, Tyler Lemon
wrote:<br>
</div>
<blockquote
cite="mid:1367874113.3091224.1478536070860.JavaMail.zimbra@jlab.org"
type="cite">
<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt; color: #000000">
<div>Dear George and Marc,<br data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>For anchoring the RICH assembly structure, we would need to
drill about 6 inches into the clean room floor.<br
data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>For the drilling process, Walt mentioned this morning we do
need a blind penetration permit and also a silica dust hazard
analysis. Would there be any other hazard analysis or safety
steps we would need for the drilling in the clean room?<br
data-mce-bogus="1">
</div>
<div><br data-mce-bogus="1">
</div>
<div>Best regards,<br data-mce-bogus="1">
</div>
<div>Tyler<br data-mce-bogus="1">
</div>
</div>
<br>
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</blockquote>
<br>
<pre class="moz-signature" cols="72">--
George Jacobs
Jefferson Lab (TJNAF)
STE 12
12000 Jefferson Ave.
Newport News, VA 23606
(office) 757-269-7115
(cell) 757-876-0480
(email) <a class="moz-txt-link-abbreviated" href="mailto:jacobsg@jlab.org">jacobsg@jlab.org</a>
(website) <a class="moz-txt-link-freetext" href="https://userweb.jlab.org/~jacobsg">https://userweb.jlab.org/~jacobsg</a></pre>
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