DRC-2009-006036 - 0901a0688036199c

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From: Steve Landau <[e-mail]>
To: "[e-mail]" <[e-mail]>
CC: Dave Rupp <[e-mail]>, Harold Roberts <[e-mail]>....
Date: 10/20/2009 1:11 PM
Subject: Freeboard Calculation-UDEQ Request For Information dated October 8. 2009
Attachments: ScanOOl 2934.PDF: SC0349.Site Stormwater Proposal.20091019.f.prp.pdf
Dear Mr. Finerfrock.
Please find attached a letter concerning the information requested by UDEQ in correspondence dated October 8. 2009 and a
proposed work scope referenced in the letter.
If you should have any questions regarding this matter, please contact Ur. Harold Roberts or me.
Yours Truly,
Steven D. Landau
Manager. Environmental Affairs
Steve Landau
Manager. Environmental Affairs
t: [phone] I f: [phone]
1050 17th Street. Suite 950, Denver, CO 80265
DENISON MINES (USA) CORP
wvkw. den isonm ines. com <hltp://wvw/. den isonmines.com/>
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10875 Rancho Bernardo Road
Suite 200
San Diego, CA 92127

PH 858.674.6559
FAX [phone]

www.geosyntec.com
19 October 2009
Mr. Harold R. Roberts
Vice President, Corporate Development
Denison Mines (USA) Corp.
Independence Plaza, Suite 950
1050 Seventeen Street
Denver, Colorado 80265

Subject:

Proposal for Professional Services
Tailings Cell Freeboard Limits and Stormwater Control
White Mesa Mill, Blanding, Utah
Geosyntec Project: SC0349

Dear Mr. Roberts:
In accordance with your request, Geosyntec Consultants (Geosyntec) is pleased to present this
proposal to Denison Mines (USA) Corp. (DMC) for professional services related to the
evaluation of freeboard limits within the tailings cells at the White Mesa Mill in Blanding, Utah.
SCOPE OF WORK
As requested by DMC, Geosyntec has prepared the following scope of work for providing
professional services for the evaluation of the tailings cells freeboard limits. Geosyntec’s
understanding of the work required to achieve the project objectives is outlined in the following
tasks.
Task 1 – Engineering Analyses
Geosyntec will prepare a grading plan for the top of tailings for Cell 3, along with a grading plan
for the top of interim cover. Interim cover will have a minimum thickness of 3 feet (based on
Reclamation Drawings) with interim cover thickness increasing to provide drainage of surface
water toward the Cell 3 to Cell 4A spillway. Geosyntec will include a small berm along the
eastern and western perimeter of Cells 2 and 3 to contain and direct surface water toward Cell
4A and Cell 4B (as appropriate). Geosyntec will perform analyses to estimate surface water run
off and appropriate freeboard limits in Cell 4A to collect and store the run-off water. Analyses
will be performed for the following conditions:
1. Current conditions – Cell 3 not filled with tailings
SC0349.Site Stormwater Proposal.20091019.f.prp.doc

Mr. Harold R. Roberts
19 October 2009
Page 2

SC0349.Site Stormwater Proposal.20091019.f.prp.doc

2. Interim conditions – Cell 3 filled with tailings and interim cover, Cell 4A accepting
surface water run off from Cells 2 and 3.
3. Interim conditions – Cell 3 filled with tailings and interim cover, Cell 4A and Cell 4B
accepting surface water run off from Cells 2 and 3.
Upon completion of the analyses, Geosyntec will prepare and submit to DMC a draft letter report
summarizing the analyses performed and our engineering recommendations. The letter report
will include copies of the engineering analyses and grading plans for the top of tailings and
interim cover.
Task 2 - Project Management
Geosyntec has budgeted for standard project management costs that are required for the
successful management of the work for the anticipated schedule.
SCHEDULE AND COST ESTIMATE
Geosyntec proposes to complete the scope of work outlined above on a time-and-materials basis
for a not-to-exceed cost of $21,100. A breakdown of the estimated costs is shown on the table
below.
Task No. Proposed Budget
Task 1 – Engineering Analyses $ 19,680
Task 2 – Project Management $ 1,420
Total:$ 21,100

Geosyntec anticipates submittal of draft letter report and supporting documents within two
weeks of receiving approval of this proposal. Upon receipt of DMC’s comments, Geosyntec
anticipates submittal of the 100% letter report to DMC within one week.
This scope of work shall be performed in accordance with the terms and conditions with the
existing Professional Services Agreement between Geosyntec and DMC dated 30 September
Mr. Harold R. Roberts
19 October 2009
Page 3

SC0349.Site Stormwater Proposal.20091019.f.prp.doc

2008. An authorized representative of DMC shall indicate their acceptance of this proposal by
signing where indicated below and returning a copy of the signed agreement to Geosyntec.
Geosyntec appreciates this opportunity to provide engineering services to DMC. If you have any
questions or require additional information regarding this proposal, please contact Greg
Corcoran at [phone] ext 205.

Sincerely,

Gregory T. Corcoran, P.E.
Principal Engineer

APPROVED AND ACCEPTED:
Denison Mines Corporation

By:
Mr. Harold R. Roberts Date