DRC-2011-001457 - 0901a068801fb468

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TRANSMITTAL
TO: David Rupp, P.E.
Director, Division of Radiation
Control
Utah Department of Environmental
Quality
Date: 1/27/11 Job No.: SC0349-05-03
195 North 1950 West, PO Box 144810
Salt Lake City, Utah 84114-4820
We are sending you • Enclosed r~l under separate cover via the foUowine items:
Q Original K Report • Letter • Drilling Log(s)
E Copy • Documents D Sepias/Drawings • Test Results
O Contracts Cl Specifications • Photos
Copies Date Description
1 1/27/11 Response to Email Comment - Cell 4B Final CQA Report, White
Mesa Mill Facility
These are transmitted as checked below:
l~] For Approval
K For Your Use
• For Your Information
l~l For Your Review
Q For Your Signature
K As Requested
• Approved as Submitted
O Approved as Noted
n Retumed for Corrections
• Resubmit Copies For Approval
• Submit Copies for Distribution
• Retum Corrected Prints
REMARKS:
Copy to: Harold Roberts, DMC FROM: Gregory T. Corcoran
Rebecca Flynn
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Geosyntec'^
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27 January 2011
David Rupp, P.E.
Division of Radiation Control
Utah Department ofEnvironmental Quality
195 North 1950 West
POBox 144850
Sah Lake City, Utah 84114-4850
Subject: Response to Division of Radiation Control Electronic Mail dated 27 January
2011, Re: Denison Mines Cell 4B - CQA Report Addendum
White Mesa Mill - Cell 4B
Blanding, Utah
Dear Mr. Rupp,
Geosyntec Consultants, Inc. (Geosyntec) has prepared this letter on behalf of Denison Mines
(USA) Corp. (DMC) in response to the Utah Department of Environmental Quality, Division of
Radiation Control's (DRC's) electronic mail (email) letter, dated 27 January 2011; Re: Denison
Mines Cell 4B - CQA Report Addendum. For ease of review, the DRC's comments are
summarized below in italics with DMC's responses following each comment.
...for item 3.b.(l)., we are still trying to determine the method, used in construction, to
change directions of the strip drains that were originally specified io change
direction. Such strip drains are shown on Construction Drawing Sheet 4.
Earlier, in a response to this inquiry, Geosyntec provided catalog copies, showing some
directional fittings for strip drains, and a single photo showing a linear, non-direction
changing fitting. We then requested some example photographs of these installed
directional changing fittings, at the locations described earlier. In this latest response,
Geosyntec has proffered photographs 1 through 4 in Attachment 1 of the letter, which
shows some curving of strip-drains, but not at the referenced locations. What are we to
SC0349 RTC 20l00127a.docx
engineers I scientists I innovators
David Rupp, P.E.
27 January 2011
Page 2
understand from this? Please clarify and certify, specifically what was used in these
cases.
The linear, non-direction changing fitting shown in Photo 3 in Attachment 3 of the letter
response provided 21 January 2011 is a standard splice fitting, as provided by manufacturer, used
as an end-to-end fitting for the strip drains. This fitting was used to join separate strip composite
rolls, in accordance with the manufacturer recommendations. The ends of each strip drain to be
joined are each inserted into separate ends of the splice fitting. Both the geotextile wrap and the
center core of the strip composite slide into the splice fitting. Once inserted, a separate piece of
filter fabric is wrapped around the outside of the fitting. The ends of the filter fabric were taped
to the strip composite filter fabric wrap to form a sealed seam between the strip drain filter fabric
and the separate piece of filter fabric wrapped around the splice fitting.
The manufacturer does not make elbows, bends, or other fittings for making bends in
horizontally installed strip composite. Rather, the strip composite is bent to accommodate turns
as illustrated in photos 1 through 4 of Attachment 1 in the letter response dated 27 January 2011.
No fittings were used to make bends in the strip drains.
If you have any additional quesfions please feel free to contact me at [phone].
Sincerely,
I Digitally signed by Greg Corcoran
/^DN: cn=Greg Corcoran, o,ou, |
__email=[e-mail], c=US
"Date:'2011.01.27 15:37:15 -08'od'
Gregory T Corcoran, P.E
Principal
Copies to: Harold Roberts, DMC
SC0349 RTC 20IOOI27a.docx
engineers I scientists I innovators