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Phillip Goble - Re: White Mesa Mill GWDP UGW370004 Well Development
Approach for MW33 and MW34
DRC-2010-004681 From: Phillip Goble
To: Tischler, Jo Ann
Date: 8/24/2010 8:32 AM
Subject: Re: White Mesa Mill GWDP UGW370004 Well Development Approach for MW33 and MW34
CC: Frydeniund, David; Morton, Loren
Jo Ann,
After reviewing the August 23, 2010 Letter regarding future wells MW-33 and MW-34 and well development for
all wells on site we have the following comments.
DUSA has voiced a concern using air jetting as a well development technique. DUSA also proposes to use water
jetting for well development. Both of these methods are to be considered techniques of last resort, after prior
consultation with the DRC.
We agree that the preferred well development techniques should be the bailing, surging, and overpumping
methods. Please keep in mind that the overpumping method is the most desirable method of these three. If
after exhausting these three methods, the wells still do not show water less than the 5 NTU standard, the DRC
will have to reassess the situation.
In addition, well design and construction techniques are critical to ensure adequate placement of well screens,
sand pack, and seals.
If you have any other questions please let me know.
Sincerely,
Phil Goble
Hydrogeogist
>>> Jo Ann Tischler <jtischler@denisonmines.com> 8/23/2010 5:06 PM >>>
As we discussed, I have attached a letter
a) summarizing our phone call of August 18, 2010 and
b) describing Denison Mines (USA) Corp's approach to developing the new wells MW33 and MW34 to be
installed the last week of August 2010.
A hard copy of this letter has also been transmitted by overnight delivery.
We hope to have you concurrence or comments on this approach before we initiate well development. Please
contact me with your comments or concurrence at your earliest convenience.
Your truly,
Jo Ann Tischler
Jo Ann Tischler
o. c V e nn, P. DENISON MINES (USA) CORP
file://C:\Documents and Settings\Pgoble\Local Settings\Temp\XPgrpwise\4C73838EEQD... 8/24/2010.