DRC-2011-007893 - 0901a068802cbd01

DENISO
MINES
November 14, 2011
Denison Mines (USA) Corp.
1050 17th Street, Suite 950
Denver, CO 80265
USA
Tel : [phone]
Fax ; 303 389-4125
www.donl8onmine3.com
VIA E-MAIL AND OVERNIGHT DEUVERY
Mr. Rusty Lundberg
Utah Department of Environmental Quality
195 North 1950 West
P.O. Box 144850
Salt Lake City, UT 84114-4850
Re: Denison Mines (USA) Corp. ("DUSA") White Mesa Mill Facility Response to 2nd Quarter, 2011 DUSA
DMT Performance Standards Monitoring Report and Cell 4A and Cell 4B Performance Standards
Monitoring Report (Dated August 31, 2011): Ground Water Quality Discharge Permit UGW370004:
DRC Findings, Confirmatory Action and Notice of Enforcement Letter
Dear Mr. Lundberg:
This letter transmits Denison Mines (USA) Corp's ("DUSA's") responses to the DRC Findings, Confirmatory
Action and Notice of Enforcement Letter, dated November 7, 2011.
We have re-quoted each of DRC's Findings and Confirmatory Action items and provided below, specific
responses to each item discussed in DRC's November 7, 2011 letter.
DRC Findings:
1. Part 3.1 (b) (v) of the GWDP requires DUSA to monitor and record weekly, the depth to wastewater in the
Cell 2 slimes drain access pipe to determine maximum and minimum head before and after a pumping cycle,
respectively. This information was not included in the Report.
DUSA Response:
See response to Confirmatory Action ^1. The data has been provided in attached Tab A.
As discussed during DRC's telephone conference with DUSA on October 26, 2011, DUSA currently has one
DRC-approved DMT Plan, which addresses the DMT requirements set forth in the Radioactive Materials
License ("RML"), which has no quarterly reporting requirement, as well as those set forth in the Mill's GWDP,
which requires a quarterly DMT report. The quarterly DMT reports submitted by DUSA are intended to satisfy
the requirements in the GWDP, and afe not intended to include information that is required to be monitored, but
not reported, by the RML. Information required by the RML is available for inspection at the Mill.
The requirement in Section 3.1(b)(v) of the DMT Plan is a requirement of the RML and is not a DMT
performance monitoring standard required by Parts I.D.3 or I.E.7 of the GWDP and hence is not required to be
included in the routine DMT Performance Standards Monitoring Report under Part I.F.2 of the GWDP
N:\Required Reports\DMT Reports\2011 DMTAQ2 2011 DMT Report\Q2 AddendumM 1.14.11 Response to DEQ 11 7,11 Itr
DMT.doc
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Letterto Mr, Buaty arrot
Norrember 14, e011
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DUSA has provided the information reque8tEd in the DRC'$ November 7,2011 letier lor completene68 ol
response, Howevsr, as disoussed dudng the telephons cortference, DUSA intends to reviee the DMT Plan by
prepadng two eeparate plans for the GWDP and BML requlrementa. Following approval of the plans, DUSA
proposes to contlnue providng quarterly DMT reports addresslng the GWDP DMT requlrem€nta only. Untll
suoh tlmE ae the aeparate plans are approved, DUSA wlllcontlnue to inolude the HML:required informatlon in
the DMT rsport, lf required by the Executlve Secretary.
2" Affiondh( A,ttc tlre fuport prafp|nte waaw water aufiafE elalatiij,he in tha tdlllnga oalb aN Rd.bsrla Pond.
DaE for tha wqak of Apfil E , eal t @a nd appear ln thp rurterciwd Attaohmant A.
DUSA Rgeponsc:
$ee reaponee to Conlinnatory Action #2, below, The data has boen provlded ln attached Tab B.
3. DUSA began dlvertlng tailings to Qell 48 on February 1, 2011. No eolution pool elevatlon mdasurcments
werc tr,lron until Mqy 91, zol 1 . This is in .vlolatlon of Part 3,1 (a) of tha BAT Plan, ORC prevlously noted thle
violatiort durlng lb raviaw letter tor the t'I Quaftar Report dated August gt, 2011, Duflng the Ond Quartar ot
2011 DUSA dlecwarsd this violafun and returnod to compllance.
DU$A Fccpon*e:
No reeponse required.
4, Paila.\d) otthe DMTB,AT requi+s DUSA meas.ure tha gizg arrd ma,rlmum elavation of the tallinge beach in
Cella 4A and 4:8 monthly. Thle lnformation dooe not eppffir in the R;efrclrt.
DUSA Hesponct:
Baeed on tho lacts and background informatton inc-luded in Tab C of the Second QuaftEr 2011 DMT
Addendum, beach Elevetlon maasur€mente are no longer required for Cell 4A per the approved DMT Plan,
Revieion 11.1, dated January 2011 and approvad by DHC on January 10, 2011. Moaeurements oeaeed ln
February 2011, after the approval lor thE us€ of C6ll 4ts was recelved from DRC, The remeining reference to
beach el€vation meagurements in Coll 4A ln the currently approved DMT Phn, Sestion 9,1(d) is a typographlcal
error. The lntent of Section 3,'l(d),b, was clearly lo remove ihe beach elevation msseurem€nts from all talllngs
oelle except Cell 48. DUSA will submlt a revised DMT Plan, for DRC review and approval, to corrsct thle error.
DU$A proposes to Eubmit tw'o separhta revised DMT Plana to address tlrls correctlon as well as the separation
ol requlrementE disougsod in raeponee to Cornment Number 1, above, by January 14, 2012.
No baach elevation measurements have heen conducted to date ln C6ll 48, as there are no beaches present at
tftie time. Future beach alevation meAsurom€flts will be oonducted in Cell48 when beachae are observgd.
5. Ff,dfl. l(a) of the DMT Flan raqulrce DUSAlo monftorthe leak dsteotton sJlatom forCeils I aN I wwkly,
Ihp'F/an ruqulrw DUSAtB,-trprrlthetilkdeterlthn *ystem,ea,drye or.'to.rero(the f,uid'lewllntheeya/clm,
Dateotlng tluid triggere d Hgulrapent to *xtrant il1e f,utd, me&sut6 tfie exfrEctgd volume, aN cvlrnputo e
leakagl ruts lot the call. The { Quarter DMf Pailormanoe &Endarde Monitoring norrrtt @fitalne no date tor
either ths Cell I or Cell I leak daeciisn $ysIErnE.
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Letter to Mr, Rusty LrnOt
November 14, 201 1
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DUSA Reeponse:
The requirement in Section 3,1(e) CIf the DMT Plan is a requirement of the FIML and is not a DMT performance
monitoring standard roquirod by Parts 1.D.3 or 1.8.7 of the GWDP and hence is not required to be includod in
the routine DMT Porlormance $tandards Monitoring Beport undor Part 1.F,2 of the GWDP.
DUSA has provicled the informalion requested in DRC's Novembor 7,2011 letter for completeness of ro$pons6.
Howsver, ae discussod during the above-mentioned tolophone conforonce, DUSA intends to.revise tho DMT
Plan by preparing two soparate plans for the GWDP and RML requirements, Following approval ol the plans,
DUSA proposes to continue providing quarterly DMT reports addressing the GWDP DMT requiroments only,
Until such time as lhe separate plans are approved, DUSA willcontinue to include the RMl-required
information in the DMT report, if required by tho Executive Secretary.
Monitoring results for the second quarter 201 1 Cell 1 and 3 leak detection syste rTts are included in the DMT
Addondum in Tab D and are discussod in Conlirmatory Action #4.
As shown in Tab D of the Socond Quader 2011 DMT Addendum, Csll 3 loak detection system was dry for tho
entire quader, but Cell 'l had fluid levol detections during this period, Howavor, no fluid extraction or sampling
was required or took place as a rosull ol the Cell 1 fluid dotections. ln regard to DFIC's findings above
"Datecting fluid triggors a requirement to extract tho fluid, m&a$ure the oxtracted volume, and compute a
leakago rato for the cell.' DUSA believe thi$ to be incorrect, Cell 1 fluid measurements throughout the quarter
wero minimaldetections ranging lrom 4 inches on April 1, 2011 to 0.1 inches on June 30, 2011, and did not
consist ol sufficient fluid to allow extraction or pumping, Tho currently approved DMT plan, Revision '11.1,
Section 3.1 .a states , " lf suff iciant fluid is prc'sent in the leak detection sysfem of any cell, the llttid shall be
pumpad from the LDS, to the extent reasortably posslb/e, and record the volume of fluid recovered. Any fluid
pumped from an LDS shall be returned to a disposa/ cel/." DU$A believe the f luid detections in eell 1 were
residual fluicJ which could not be removod lrom the last Cell 1 leak detection sy$tom pumping event on August
8, e010. ln an August 18, 2010 lettor f rom DU$A to DBC, DUSA described in detail the root cause of signif icant
fluid levels in the leak detection system which required extraction and sampling on June 3, 2010 and August 8,
2010 to possibly be a break in the Coll 1 linar near the surface level of th6 c6ll, and includod a detailed plan lor
the repairs to the liner which bogan in $eptomber 2010 and are ongoing. Tho August 18, 2010 letter is included
in Tab D of the Second Quarter 2011 DMT Addendum,
6. Part 1.D.6(b) of the GWOP specifies a head"dopendent allowable leakage rate through the Cell 4A flexible
rnembrane liner, Part 3.1 (a) of the BAT Plan rsiterates fhr.s requiremenl. ln light of the spillway belween Gell 4A
and Cell48, the DRC removed the requirement to measure the Cell 4A salution pool elovation to demonstrate
compliance with freeboard requiremsnts for the cell. When DUSA placed Cell 48 into sorvice on Februaty 1,
2011, measurament of ths solution pool elevation in Cell 4A ceased. Tho rosull of terminating the Cell 4A
monitoring was a /ack of data lo use to calculate the allowablo /eakago rate through the flet<ible membrane liner.
This failure to monitor perslsted through the end af the Znd Quarter of 201 I . DRC ac/dressec/ this lssue tn
cortjunction with the roview of the l't Quarter Report. DIJSA has now returned to compliance with respecf fo this
mon itori ng requ irement.
DUSA Response:
No response required.
7. Pad 1.8.8(a)(l) ol th@ GWAP roquires DUSA to provide cotttinuou$ operation ot the Cell 4A LDS pumping
and monitoring oquipmont, and to make such equipment aperational within 24 hours of discavery of a lailurs of
such equipmsnt. On June 22, 201 I Mill personneldlscoyorecl that the LDS monitoring data logger had ceased
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Letterto Mr, Rusty Lundt
November 1+2011
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to reoord on Jund 7, 2011. Plant perconnel rebootd the eystem qnd oWerued rusumption ol data logghg.
Plant parconnel checked tha loggar morc frcguently tollowing the raboot, and rerr,ated the aystam raboot on
July 1, 2011, Upon dlsoovery that rcbooting the eystam did not coneat the failurd, DUSA consulted with the
equipmont manutalturer lor trcuble atooting and rcpalr advlca. DUSA has reetorcd he data logging equipment
to aompliant opdratlon, lncluding installatiort of an upgruded version of the data manegement aoftware durlng
July, E?l l, Fallure to repalr a tailed aystem and brlng ft to tull operation within 24 hwtx consfrtu|es a violatlon of
Part 1,G,3 0lthe QWDP.
DU9A Herponec:
No response requlred.
DRC Confl rmatory Ac'tion :
1. DUSA will provide the weekU lnepction sheets aN a ckta tabld summartzing the weeh$ maxlmum and
mlnimum fluid level inthe Qell 2 Sllmda Dmin tor the Znd quarter of 20/.1 to the DHC as an adddndum to the
Znd Quaiter DMT Pertormanoe Sfandards Monrtorlng Reryft. All tuture OU$A DMT Performance Standlards
Monitoring Reporta will lnoluda waakly inepaotiort sfieels and a data table preeerrttrtg he weakly maximum and
minimum fluid level in thd Call 2 $limes Drain.
DUSA Hcrpontc:
See the respon0e to Number 1, above. As requested, the Cell 2 Slimee data for the second guarter ol 8011 ara
inoluded in Tab A of the Second Quarter a011 Dlvff Addendum.
?, DUSA wlll proulde a revisd Afiacnment A to the relport that ittctudea the weekly water surtaoe alevatione in
the tatllngs cellle and Floberts Pond tor the wa€k of Aptil 29, 9011,
DUSA Response:
The omleaion of data lrom the week of Aprll 29, 201'1 was an overalght. As raquested, the revieed weekly water
surface elevations in thetailings cetle and Roberts Pond, whlch now lncludethe weekof Aprll 29,2011, are
lncluded in Tab B of the Seoond Quartsr 2011 DMT Addendum.
0, DUSA wlll provlde tha monhly sulay data and a data tabla sunmailzing the laillnga heaoh araa and
mgu(ffium elavatlon for aach maltth othe ?N quafiEr of N11, Nlfuture DUSA FW Pertormarw,,e fiandarda
Monttodng Re4lofie wlllinclude fi,onthly Butwy drfa and a Mta Hble preeentlng ha lu,ilings DEaefi aren aN
maxlmum elevefron for each firottth
DU$A Responre:
As explained above, no beach elevatiofts were ob66rued in the 2M Quarter of 2011. Ftfiure beaoh elevatlon
measurements wlll ha oondueted and included ln the Quarterly DMT reporte for Cell 48 when beachee are
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Letter to Mr. Rusty Lr"db;
November 14,2011
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4. DIJSA will provide tho loak dotaction system monitoring results for Cells 1 and 3 in a tabla for each week of
the 2nd quarter of 2011, All tuture DUSA DMT Porformanca Standards Monitoring Reports will include leak
detection system monitoring rosulfs for Cells 1 and 3 in a tablo for each week ol the monitoring pariod.
DUSA Response:
See response Number 5, above. As requested, a table including the leak detection system monitoring results
for Cells 1 and 3 is included in Tab D of the Second Quarter 2011 DMT Addendum.
Please contact mo if you have any questions or roquire any further information,
Yours very truly,
Derutsor.r MrNEs (U$A) Conp.
fue^ **"u#d*-.*_
Jo Ann Tischler
Director, Compliance and Permitting
David C. Frydenlund
Harold B, Boberts
David E, Turk
K. Weinel
Centralfiles
0ENrsorJ)#d
IrillHE$
WHITE MESA URANIUMMILL
ADDENDUM TO Zd Qu""t r 2011
DMT PtsRTI)RMANCE STANDARDS MONMORING REFORT AND CELL 4A And
CELL 48 BAT PERFORII4ANCE STAIYDARDS MOMTORING REPORT
Reporting Pertod
Aprll throughJune
20tt
State of Utalr
Groundwator Disoharge Permit No. UGW370004
Prtpared By:
Denison lvlines ruSA) Corp,
1050 17o $Eeot, Suite 950
Denver, CO. 80265
November 14, 2011
TABLE OT CONTEIYIE
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INDEX OE TABS
Tah A - Cell 2 Slimes Drain Liquid Lovels
Tab B - Tailings Pond Elevations
Tab C - Tailiugs Beaoh Elevations
Tab D - Cell 1 and Cell 3 l"eak Detection Systems
Tab E - Calculation of Maximum Daily Allowable LDS Flow Volume for Varying Head
Conditions in CeUs 4.{ and 48
1.0
WIIIIE MESA UBANTUM MILL
ADDENDIIM to 2"d Quader 201.1
DMT PMRTORMANSE STANDARDS MONTTORING REPORT AND CELL 4A ANI)
CELL 48 BAT PERFORMANCP STANDARDS MOIVTORING REPORTS
INTRODUCTION
This is an Addendum to the Second Quarter Discharge Minimization Tcchnology ("DMT")
Performance Standards Monitoring Report prepared by Denison Mines (USA) Cory.
('*Denison"), as required under Pafi I.F.2 of the Vfhite Mesa Mill's (the "Mill's") State of Utah
Groundwater Discharge Permit No, UGW370004 (the "GWDP"), and the Routino Cell 4A and
Cell48 Best Availablo Technology ("BAT"') Performance Standards Monitoring Roports for the
second Quarter, as required underPart I,F.3 of the GWDP,
This Addendum is being prepared in response to the October 25,2OLl teleconference between
State of Utah Division of Radiation Control ("DRC") and Denison as documenhd in the DRC
letter dated October n,20tl (received by Denison on November 7, 2011). The Octobor 27,
201[ letter transmits the DRC findings, Confirrratory Actions and Notico of Enforcemont
Discretion. This Addendum provides the infotmatron requested in the aforemsntioned October
27,2011 letter.
2,0 ADDENDTJM ORGANIZATION AND CONTEI{TS
This Addendum cortsists of the following items:
Tab A - Tab A includes the Weekly Tailings Inspection Fonns as wpll aE a Burnmary table of the
Cell 2 slimes drain data for e€cond quarter ?Oll. The Weekly Tailings Inspection Forms are
included ln rcsponse to the DRC rcquest for tlu second quarter 2011 Cell 2 sllmes drain liquid
level measurements. The, Cell 2 slimos drain measurcrnonts are recorded in itom number 2 of the
Weekly Tailings Inspection Forms,
Tab B * Tab B contains a revision to the Tailings Pond Elevatione Measurcment Summary
originally submitted August 31, 2011 with the routine second quarter DMT Report The data for
the week of April 29,2Dll was inadvortently omitted firm the original rcport subrnitted August
31, 2011, No changas will be made to the routine DMT report as a rpsult of this submission
because these data are alrcady included in the rcutine rcports. These data are being submitted as
e correction to previously submitted report.
Tah C-- Tab C includes the background documentation diecussed below for beach elevation
mca$uroments in Cells 4A and 48.
Facts and background infonnation regarding the measuremont of beach elevations arE as followe:
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a) Beach elevation msasurements arc required for the calculation of annual Freeboard limits as
specified in 6.3,5 of the White Mesa MiU Tailings Management System and Discharge
Minimization Technology tvlonitoring Plan ('DMT Flan') Revision 11,1 dated January 2011. It
is important to note that freeboard limits are only calculated for Cell4B. The Fresboard limit for
Cell 48 is set assuming that the totat PMP flood volume for Cells 2, 3, 4A, and 48 will be
accornsrpdatrd in Cell 48.
b) Beach elevation mes$ureffr€nts for Cell 4A werc completed ftom second quarter 2@9 when
beaches were first rcported, through first quarter 2011, The Iast measurtment of beach
olevations in CeIl 4A was conducted February 18, 2011 (firet quarr€r 2011),
c) The cunently approved rovision of the DMT Plau is Rwision 11.1 dated January 2011.
d) Approval for the DMT Plan, Reviaion 11.1, dated January ?.011, was tran$mitted to Denison
via conospondence from DRC, dated January 20,2011 (Attached in Tab C).
e) Prior io Dsnieon rcceipt of the approval for the DMT Plan, Revision 11.1, dated January 20,
2011, Denison submitted several draft iterations and rcvisions of the DMT Plan in preparation
for placing Tailings Cell 4B into service. Tho draft revisions of the DMT PIan incorporated
changes required to address the newly cons[ucted CeU 48.
f) DRC comments in a letmr dated January 6, 201I to ttre Draft DMT Plan, Revision 11.0, dated
Novpmber 12,2010, provided Denison with several options regarding tho approval of the DMT
Plan with regard to the inclusion or exclusion of Cell 4A freeboard limits. Denison chose to
rEmove the Cell4A freeboard requircments (including beach elevation measurements) and await
DRC approval of the DMT Plan, Revision 11.1, dated January 2011 prior to DRC authorization
for use of Cell 48. Approval of the DMT PIan, Revision I l.l, dated January 2011 allowed the
removal of the CeU 4A Freeboard limits and the rtquirements to measure beach elevations
associated with the calculation of Cell 4A, Freeboard limits on an annual basis. Denison's
reeponse to DRC's comrnsnts letter is included in Tab C.
g) The DhdT Plan, Revisiort 11.1, datod January 2011 requires the measurement of beach
elevations in Cell 48 only, as specified in Section 3.1(d),8 and on the Weekly Tailings
Intpection Form included in Attachment A of the DMT Ptan, The DMT Plan, Revision 11.1
reference cited in the DRC letter dated October 27,2071 is conpct in notirrg that Section 3.1(d)
state'$ that beach elevations will be measured monthly in Cells 4A and 48. The text in Section
3.1(d) which statee that beach elovations in CeIl 4A will be measurEd is a tlpographical enor,
which will be comected by revision of the DMT Plan.
h) Beach olevation measurEments were not conducted in Coll 4B during the second quarter 201I
because there wore no beaches in Cell4B in ttre second quarter of 2011, It is important to note
that as of the date of this Addondum, beach elevations have not been measured in Cell 48
because there are no bEaches in Cell4B. Currently, Cell48 receives fluids only.
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In sumrnflry, based on the above facts ard background information, beach glevatlon
measuremente are no longar requted for Cell 44 per the approved'DMT PIan, Revisiotr 11.1,
dated January 2011 and approved by DRC on Januaxy ?O,2011. Moasrtrcments cessed in
February 201I, after the approval for the use of Cell4B was received from DRC. Ttre remaining
reference to beach elevation measuretnents in Coll 4A in the curfently approved DMT Plsn,
Section 3,1(d) is a t;pographical 0rror; The intprrt of Section 3.1(d).8, was clearly to rumOve the
beach elevation mea$urements frotn all tailiugs cells except Cell 48. The DMT Plan will ba
revised to oonect this error, No boach olevation measurementg haVo been conduoted to t&& in
Cell 48, as ttrere are no beaches pr*ont at this time. Future beach elevation meqsurtments will
be conductod in Cell48 when beaches are observed.
Tnb D - Tab D includos a summary table of the Cells I and 3 LeaI( Detpctlon Systems ("LDS")
data for rccond quarter 2011. Additionally, DUSA's August 18,2010, letter ".Irara of Utah
'Ground Water Discharge Permit ("GWDP" ) No. UGW370N4 Whtte Mesa Uranium Mill - Phn
ard Scltcdule for Cell I Inspection and Repairs" is included to provide baclcground infonnation
on the Cell I liner repaira, The last time liquid was detected at sufficiEnt volume 0o be pumped
from the LDS system was on August 8, 2010, Per the cunently approved DMT Plan, "If
sufficient fluid is present in the leak detestion system of any cell, the fluid shall be pumped from
the LDS, to the extent reasonably possible, and record the volume of fluid resovernd. .{ny flutd
pumBed frqm an LDS shall be returned to a dlsposal oell." (3,1,a) The flqid was purrped t0 th's
extont roasonably poseibie, elthough,a rninimal lgvel of .fluid, insuffloisnt to allow pUmpingi
rcmainp in'the LSS systotu, Mi0irnal fluid detottiahs wEre Beeri iri tlle'(hll 1 [D$ iri tn'e eecone
quarter of 201 1, but the detections were not sufflcient to allow exffacdon or purnpin-g.
Tab E - Equatiou/foiunula for rnaximum daily ellpwable I.,D$ f,Uw volUu-re fot'v,ar$iu& trbad
corulidon$ ln tho pell, Tahlss tA artd 1B from the Best Svatlehl$, Tochtolo&ll ('EAf)
Opsraffoils and [4anagem6nt FIan, Bevtsion 9.2 have hmn iqp]ud*tifof 6fl$e oJ rsyiprfl. Toblag
1A ffrd 1B are routhely provided ttr the {partorly DMT reportr. fhe ffiethudg qf cnlsdilion fqr
s€cond quafier 201I am slso iilpludcd in tsb E Futurs roritln-o DMi ruports wflt inOluile a copy
of the oquation/fordtula methodo, the quartpdy calculafions, andTabler 1A snd- 18;
3.0 Yerlfleatlon
Except as set out above by this Addendum, the contents of the Seoond Quarter DMI
Performance Standards Monltoring Report, as submitted on August 31,2011, rcmains
unchanged
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':
4.0 SI(;NA1I'[JRAANDCITR'I'IFICATION
This clocrtrllcnt wttri prcprarerl by Dcnison on Novcrrrhcr 14, 201 l,
Ilenison Mipes (tJ6A) Corp.
By:
Davirl C./Frydcnlund
Vice Presir.lent, Rcgulat<.lry Aftairs and Ccxrnscl
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C[R]'IFICA1'ION:
I certily, undcr penalty ol-law, that this ckurrncnt lncl all uttachnrcnts wcre prcparccl uncler my
clirootion r"rr supcrvision in *ccordancc with a systcnr clesigncd [o as.sLrrc thitt qualilicd pcrsonnel
properly gathcr and cvaluate the inlbrnration suhrnittcd, l3ased on nly inquiry o[ tlre pcrson or
pefsons who nrunagc thc systcm, or those persons dircctly responsible fur gathering the
inlornration, the inl'r:r'nlittion suhnritted is, to thc best of rny knowledgc and bcliel true, accurate
ibiIity ol'linc anel irnprisonulcnt fc.rr knowing violatit:ns.
D atfi ff (i . $"yclcn I u ncl
Vice Presi&ent, Rcgulatory al irs and Clounscl
Denison Mincs (USA) Clorp.
5
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4lLlZfrLL 24,01 25,04 13,99 12,96 ve#,I'''
418/20LL 24.,6 25.ss 19,4 12.4s ve$
4lt5l20tt ru/e I N/A 1 NC NC , Y€S
4lzzlzott ru/e 3 N/R ?NC NC yes
4lzelaotl 24.55 25.X7 13.45 12.63
sl6/20L1 23.65 24.98 14.35 13.02 ye5
SlrsilzaLL 23.88 2s.96 L4.L2 12.04 ye5
3lZOlz0LL N/A 3 N/A 3 NC NC yes
5l?71:7O77 24.2s 25,4s 13.75 12.55 yes
613l20LL 25.45 .25.7s 12.55 12.25 yes
6lnlzoLL 24.96 25,9 13.04 12.1 yes
6lt7l.Z0L1,N/A 4 N/A 4 NC NC ye$
dl24lfioLt 20r18 :2:g::6.7.17.82 14r,33 ves,
7lUfiLt 16.85 19,52 21:$s 18,48:rldS
N/Ar - 4/15 128'l!,, Unable tp perforrn tsst dua to a haktng flanBe, Pump ls oper-ational but turneC
off,and waltlhg for maintenance to fix,
nl* - +/i2lz}t1., Urrable to perform dile td dlonthly recovEry test,
N/At - S!olz}1.J.,Unable to perform due to monthly recovery test,
N/go: 6llTlzollL, Unable to perform due to monthly recovery te$.
NC - Head levels not calculated, hecause no measurernent was taken this week.
The pre and post-pump head level calculatlons are done as follows :
reid = (38 (fr)- depth to liquid pre-pump)
head = (38 (ft) - depth to llquld posl-pump)
n"t, Ll/l#.61{ ,.hspectotr: {n,r..,:. llollul$, /*nrin Polrrr
Wlrltc Mem Mill- $tandma Oporatini Pmcodurtc
Book I lr Bnvimnmntal Protoction Manual, Seodon 3,1
t. PondandBeadt
elovations firul, h)
0l/l I Rovisionr Denimnl l.I
Pago 28 of49
*"J{a
-
s6t2,g_
APPEI{DIX A (CONT)
DENISON MINES OS4 CSRP,
WEETNLY TAILnrlGS TNSPEEIION
Ccll lr (a) Pond $olution,plevadon
O) FMlBottomElsvation ',tr
--,qlryE:dGi Ucpur of W#'abovo FML (rXb)) -J4,3fl--*
@ll4A: (e)Pod Solutiou Elcrvation
(b)FMLBofiom Elovation
-5555.14-
(o)Doptt of \Ydcr above FML (a[b))
Coll 4Er (a)Pond Solution Elcvetion
(b)FldlBomom Blovafion _s551.50
(c)Depttt of Watff abovcFMl (a)-(bD
(d)Bhvaflon of Boao[ ArEa with Higbcet Blovation
(mon&ly)
Roberte
Potrd: (a)Pond Sohrtion Elpvadm
(b)FML Bouom Elcvadon
(o)Dtp0r sf Waor above FML ((cXb)) -1,,L -,
2, Slie€s Drain tlquid t#tch Cell 2 Pumpftrncdoningproperly 9r S
Aq.Ot neFh olJquidpro{ump
MioliquidPort-purp
(all rmeasurcumts aru depth"tn-piBe)
UH, hcrd le 38'-Dopttr tol,Jguld Prolpump =
ilffitrffic 38'*Dcpth to LiquidPort'
Cl\Dmmu lld S€dne\dt!*.DlilUl-drd E*tlaEATfirfor$y I'rhild Fms\Codlo(.Onloot\llM3Y6$ltt'lulnp Mtt* gpt?tu ild DMT
li{oo Ph l{ov t0l0 Rv 1l I . Rcdltopdoc
Whirc MstrMill - Standad Opomfing Procodures
BoqB llr Bnvlrunrrcltral Protectlon Mrnusl, Socdot 3,1
0l/l I Revision: Dsnisont l. I
Puo l0 of 49 r
7, Coiltrminstod WasE Oump: LaoBp GooA ,,. , , , .",
* Doos Lcvol exceed l? inchoe abovc tho lowest polnt ort fro bofiotn RoxibIE meqbrane liner (solution
ehvatim of 5556.14 anrstfsrCall 4A nnd 5558,50 forCclt 4B)? --1 no
-
yet
If CcU 4A leak detecdm Bystcm leval H(ceed* 12 lnchee fbove thc lowwt poiot on tho botbm floxible
mombrane lluet (elorrtion 5556,t4 amel), no$fy eupawimr on MiIl mrnrgpr immcdl*oly,
C;\Doquuffi md ScalnplfrutDMCU.ml SofdnjATenrponry lnurg,Hlxt0odad.OudooRVMtY6gtl\Ttl[agrMgrrsylErn urd DMT
tvlon Ptsn t{ov 20t0 Rv ll I . Rqlllfi.doc
lrVhir MecE MiU -Sundud Operatl4g Procndutts
Book lll Envhonmonnl hotoctlon Manual, Sootion 3.1
0lill Rovition: Denironl l.l
Pago 2E of49
APPENDTX A (CONT)
DEhrrsoN MINES ruSA) COBP.
WEEI{LY TAILII{GS INSPECTION
Dato;-H-d:.ll--
l. PondandB6ach
elcvafions (mrt, ft)
2, Slimcr Draiu liguid Lcvck CEll2
Cell t : (a) Pond $oludon Blovation
(b) FMLBouornElovadon
Cell 4A: (a)Pood Solution Blcvatiorr
(b)FML Boftom Blevadon
Cell 48: (a)Pond Eolution Bhrnliou
(b)FML Bottom Elovrdon
(monhly)
Robsrts
Pond; (a)Pond Soludon Hcvadou
(o)Dopfr of WatEr above FML (aXb))
(o)Deph of Wasr abovo F[4L (t)-O))
(d)Elavation of Beach Am wlth IllgheetElcvation
_ 412D.33(bfihrf,,BotottElcvaliqrr , , 16l?.1-(o)Dcpft of WaH abovo Fh,fl- (i)+) g - O 3
Pump fu nctiming properly
. Zl, f=Q nnttr to uquid pE pump'rl;q 5 q, rt+& to Llquid Port-PumP
(alt moasurcmcnts are @th{n-plpe)
Pre.pump hcadis 38'-Dcpth to Liquid Prupump =l'1t 1'{-#HTHS338' -DePh to Liquid Pout-
CrDoqlmrile ad slttDSddn*nMcll.acrt S.trhplvurymry Inemor EBrtcodd'orloolrlVMlY6slllr{tnrr Mgnt Eyrum ud DMI
MuPterllov2010Rv Il I 'Bodllnsdm
r-
\(J/
lnspectoul , G+nrt^ Pr" L**eu, Y**ra{r f+"lli4ct7
16 tA. Aq
_55W
(c) Dopilr of Waftrabove FML(a){b)) .l$r dq
/u^ ..
-5555,14-dl./^
5557,50
Whln MemMlll -Stindald Opomting Proccdures
Eook I l; Bnvironnrntal Protcotion Mmual, Scotion 3.1
OUl I Rnvision: Dcnimnl l,l
Prye 30 of 49 r*
7, ContamlnatsdWrrto oumpt LgpJ'J 6r.& .,*- -*- .,
r Doos Invel excoed 12 inches abovo tho lowrst potnt on tho botonr flodblc mcrnbranc lioor (golutioo
olov*tion of 5556,14 amel for CcU 4A nd 5558.50 for Ccll4B)? *{.rn
-
yls
If Cell 4A leak detec$on Bystem level orcceds 12 tnches abovo Src lowost point su tho bcfrom fladblE
momHuno linpr (olovation 5556.14 ffisf[ notify mpenriaor or Mlll manrgcr immcdlamly.
CtDootmffi md Sctdn#tfiIt DtilOl"oqEl Sednputmponry htetr*t Plh*\Con$nt Ourlmt(\vM9Y6sll\Trultgl M$t $yd!m lltd DMI
Mo Ptn NoYilll0Rv lr I . Rrdlnadoo
t
White tvlosr Mtll - Strndard Opsnling ProEpdu:tc
Book I I : Ertvirunmuul ProEctlfi Manrul, $ectlon 3. I
L Pond mdBearh
elevadons (nu[ fr)
0l/l I Rovirion: Denleonl l.l
PrgE28 of49 r*
APPENDIX A (CONT)
DENIBON TT,IINES (USA) CONP.
WEEIilY TAILINGg IMITMCTION
Ccll l: (a) Pond $olr*ioa Blovaflon ,.,,,;, SGI&'6e.
.,,,. .,5555.14*
--r557.s0(c)Dopth sf Wa$( atoveFMI"(t){b))
(d)Elovdion of Boaoh Area wittr Hlgb*Blcvation
li€rI.D.EP
-5612,3-
*,w
2. Slimas Dnin Liquid l.Etcls Cell1 Punpfrmcuooing propurlv X YtS
Urn*\\" {o ?-$.^
T"rt 1,.* to a' Lsk
I*$;
{" S",y
$* rnn+q*#=-
H'nl flPtr{d is 38'"Depth toti{utd ho-pump=
T"frrcl Foetaurnp hoad it 3E'-Dcpth to Liquid Poat"
ci\Dofim6F ud $ctrtnjr\dint DMClIorl $iltlrtg$'Ibmg0ilry laallEl Hlor1cmmt()l5oot\Wrly6sl ItTdilrUl tv,tllt svrtsm {ld DMf
Moo Plrn llou 10t0 Rv lI I - Redlhcdoo
(all rrarurcments drt dep&-tn-pipo)
, PurvrF
*-n'b
rS
('*
Darctqlt5i/ tt Inrpectonr *t' . l1,l[lt tsSrr*q
G) ftfl Botbm Elovation .. ,iSfl=-
(c) Dcp0r of \ffatsr abovc Fh{L (eXb)) ,, . ..,t?,:6?L
Cell 4A: (a)Pond Solution Elevttion
(b)FML Bottom Blovation
(c)Dop6 of Watcr abowFML (t)-(b))
Cell4B; 1e)Pord Solutim Blwatiot
(b)FML Bofiom Elrovatiou
(monthly)
RobcrB
Pondr (e)Pond $olution Blevtdon
(b)FMLBouou Elevadon
(c)Depth of Sluct abovo fML (rXu))
7. cmhmiulmd lllute nvrnp; -- -].lzp#E- 6a) - , .,. ." , ,-... ..-
I Dom lpvel sxoood l2 inohcs *bovc tho lowert point on tfic bouom flcxible membgp ltner (eohtlon
olovatlon of 5556.14 amsl for Cell 4.{ Bnd 5558,50 for Cell 4B)? -*{no
-
ycs
If Cell4A lcakdotootioil eysufi lovol cxcseda 12 inchrs rbove thc lowo*polm on the bottom flextble
nourbtare llnu (elovation 5556,14 amsD, notiff atpavisor q Mill trmagu iE rtdiffely.
ClDosnGrlr md sctdnt[\d[l(t.DMcu,ocnl Surlntruh[pon]y hrtnm Estoo0acat OulIodWMtYdSlNbUrW MEnt syst$rtl uxl Dl'fl
I\&r Ph I$v 2010 Rv lt I . Red&Bdoc
Wbltt Mr86 Mill - Stlrdrd Oporatlng ProsGduros
Book I l: Environnontal Protoction Manurl, Scction 3,1
0l/l t Bovlclou Donironl l.lPago30of49 f
L,
c
r'' -
\_,
rtrhlts MoraMlll - StandrU Opcrating Procaerce
Boolc I l: Environmontal futouionManual, Sccdon 3.1
Daro: 1/le/8elt
L Porrd and Beach
clevadons (msl, ft)
0l/l I Revirion: Dmisonl l,l
Pagc 28 of49
APPENDIXA (CONT)
DEMSONMINES (U$al CORP.
IVBKLY TNLINGB INSPECTION
Call l: (a) Ibnd Solution Blovation sffi*
G) m{LBosom Ehvaflon
-.5597-
(o) Dopfi of Warcr abovo FML (a)-O)) --15Jt-
Coll4A: (a)Pond $oludou Elcwtion
O)FML Bouom Elovadon -_5555.14_(c)Dcpdr of Sranr aboveFML (al0))
Celt 4B: (a)Pond Soludon Blevation
(b)FMl-Bofrom Elcvation ,5557.fl)
(c)Pepfi cf Wattr abovcFltdl (sl$))
(d)Blovarton of Baach A$awith Htghcst Blcvation
(monftty)
Robffc
Pondr (a)Pold Solutioa ElGvaflon
&FndL Bottom Elcvation
(c)Dapttr of Warer rborrc fML ((EXb))
DoD& to Uould Dro{uulp
-oitrr
to l*i,ia eo**.rne
(all rnpaturernente uu doptlt-lnTipe)
,
Pro-pump hoad ls 38'Oepth to Uquld Prc.pump x
..,,.,,,5!f,s'1s ..._ s6T2,X_
rt.rlf,
2, Slimos Drain Liquid [.owk CelI2 Pump firncdonrrrg properly *S
\I""bL lo p"firnn )*.
+" A'nl[,5 Rccoue.g I,s[
Poct pump hoad ir 38' -Deptb to Liquid Pott
PutIlP e
Ct\Doctre;ru rsd $r{tln6r1*ntt DMOrI.mrl S€ulrt8s\Tffportry htdmct nhswollEat.oldo*\\A&Y6s llYldllrg: Mg* Syaam urd DMr
Mos PLn Hov 20lo RY I I I - Rcdtl*doc
Whltc Mcsr Mlll - Sh{dard Oporrtirtg hocoduror
Book I l; Envhonrncntal Prouctlon Mmurl, section 3,1
0l/l t Rovlsionr Denisoill l.l
Page 30 of49 t
7, Cortlminated lYasrc Dump:
* Does l,evel e.xccod 12 inohes above fie lowost point on the botom flcxtble mem$ans liner (solutlr
alevatim of 5556,14 amal for Coll4A and 5558.50 for Coll4B)? -5-no
-
ygs
If CcU 4A lesk dctcotion ry$em lcvol excoede 12 in&es abovo fte lowoet pdut on tho bottom flexible
menrbrane tlner (ebvadon 5556.14 amsl), nodfy suporviror or Mill mmager lmmedhaly.
C:Vloc$ptt rnd Ecdng$dtort-DMGtrncrl S*rlnfr\Trnfrry htlnt* Flto.\Cssilt OiloohvMlYf$lnTiflrlp Mt tl s),riior fid DMT
Mon Plen Nov il)10 Rv tt I . tudlncdoc
ifrL
t
Whib Mo$a Mill- $undlrd Opcrating Proccdurct
Book I l; Envimnmental ProtcctionManunl, Ecction 3.1
0l/l t Rovhiorr; Donlcon I Ll
Psgo 28 of49 C
APTEIIIDIX A (COIITT)
DENIBON MINHI (TISA) CORP.
WMKLY TAILINGS INSPECIION
Dxet {:r?-l t'--
l. PondandBedc,tt
clevatlong (msl, ft)
Irrrpw*r hierme,t
56el.oF
_ _ s6t2.9_
-, 9.73
Puup tunctionlng pro,porly +Ze.i[-
, a4,85 ncpmbLiqutdpro.pump,5,S-7 Dopth tolJquid PortAump
(all meaaurunonu arc dopth"inprpe)
Pnr-pump hcad if 38'-Dopth to Uquid Pr+pump =, lJ!6
Post pump head is 38' -Dopth o Liquid Post-
PUutP= . ,4.6f
Ct\Dqrrm.o0 rod $tttftrgtliluk-DMCllocrl Scilhp\TGrryorary Inttrurd ft*Coqtart.AdooHvM3Y6Sll\frlItt$ Mgtl Sy$str rad DMI
Moo Ph Nov All0Ev I I I. n d[rro.doc
Cell I: (e) Pond Soflution Blcvation {6te. 17..__
(b) FMLBosom Elcvulon
-55n-
(o) Dsp$oflYrrcrabovcFIUL(a){bD,,,, t s. ? t -
Call4Ar (a)Pond $olurion Ebvatlom
(b)FML ButomElevadon _5355.14_
(o)De,pttt of lVatct abovo FML (aXb))
CeU 48: (c)Pond Soludou Elovation
O)EMLBotbmtsIevadon
-55s7.50
(o)Dcp,th of Wrt6r abovo fML (a)"(bD
(d)Elovatim of Beech A$ca wih I,IiSoS Ehvatlon
(monfhV)
Robcrts
Potttl : (e)Pond Soluflou Elavagiqrl
(b)IIML Bot0om Elovation
(c)Dopflt of Wilerabove FML (a)-(b))
2. Slimoe Dnin Liqutd l,cvele CcU 2
Whib Mesa Mitl * Stardlrd OpsratlrB hoqdurce
Boqk l } Bnvimilmcnrsl Protsction Manrtal, Secdon 3,1
Ot/t I Rcvlslofll Denisoal l. I
rage 30 of49
1, Contaminusd'ttraste numpz Ar+Ft 6a+l . -- -
-r' Doos Lsrrcl exc*d 12 inches *orn the loweet point on he bottom flexlble meurbrane ltnor (roludon
slevadou of 5556.14 anul for Coll 4A and 5558.50 for Csll 4B)?
-
no
-
yc$
If Coll 44 leak dotoflion ByFtEm level eilccede 12 iuotrse abow the loweet polnt on tho bouom flcr,iblo
mcmbrane liua (chvation 5556.14 nmol), nod$ cuporvipr orMill mueger immedirtcfy.
G\Doorre ud Srfilogdilu*,DMC\tocdserinp\tlrrrponry htcurci Hlor$orortOudogHVMSY6lllNlU[np Mprt$yrmr rud DMT
Moa Hor Nov20l0 Rv ll I . Rodlin*doo
.t
Wblte Mess Mill * Strndrrd Opating Prooodurcs
Book t l: Bnvironrncntal hotection Mrnual, Scctlon 3.1
l. Pond ardBotoh
olcvatimr (mel, ft)
n*, 5/6/snt"t Inryectors: Po'lnr'
0l/l I Revision: Denbonl Ll
Prgo 2E of49
APPENDTX A (COND
DEIIISTON MINES (USA1 ConP.
WEBI(LY TAILINGS INSPECIION
Cell lr (a) Pond $oludott Elcvatisn kll.$*
{
(b) EMLBottom Blcvatiqn 1597-
(c) Doph oftrIateraboveptr6l(a)-(b)) lE.ha...-..
Coll 4A: (a)Potrd Solution Elraafion
(b)Wt Bottom Blav4iqn
Ccll48: (a)Pod Solution Elevuion
(b)FIvfL B ofiom Elovation
(montrty)
RobEtta
Pond: (a)Pond Solutioa Blevdm
&m,tt Bomom Elovuiou
(o)Dopttr of Warr above FML (aXb))--5555.14*
-5* lB
-561e3-
-5f57"50
G)Dcpth of Waor abova frI{L (&Xb)
(d)Blovrdon of Bea$ Arw with llighcrt Elova[on
2, Slimq Drein Llqutd Lovols CGll 2 Pump tuucdouing proeo*y ;JeS
(c)Dep,& of lVatar rbovo FNIL ((e[b)) El$-.-
.. .|n*.(5 PepUrtolJquidprc,punp
--lS-9.6-DcEft to uquid Pootgump
(all mearuromontr ars deph-tn-plpo)
iffi head ts 38'-Daplh to Ugutd Pru-pump =
Post-prmp hendfu 38'-Depth toHquid Pooc.
pumpl* 15.9*
..;I
C;\Doqul* ud &tdngldtuftDDvl0Locd $fflnp\Thrrponry trcrncr ElsfrnlsrtotltlootWMlYdgttllrlUry Mgrt SFFis rnd Dtm
Mo PlEa Noy 2010 Rv I I I - RcrlUhtdoc
ttrhita Mesa Mill - Standard Oporating hoceduer
Book tlt EnvuonmcnulPmteodon Mmrnl, Sectlon 3.1
0l/l t Revisioul Donironl 1,1
Pqge 30 of49 t
7, Contarnlncted WastoDump: L"clE ('
^,1
'I DocE Lcvol sxccod 12 tnohes abovc thc lowcgt polnt on ttrc bonom fbxible mo4brrnc llnor (golctlon
ebv*lon of 5556,14 amal for Coll4A and 5558,50 for Cell4B)? Lno
-
yps
If CcU 4A IoaE detcotion tyetsur lovd corocods 12 inchcd rbove Se lowect point on the bouom flextble
membranc linm (chvation 5556.14 amrl), notify supcrisor or Mill managsr immedirely.
c\DE mcnb ud e*nretm*.DMCtln+U8oulryr\Tempcary htama Fll*W,Ordml\\/MrY6luuhilry Mgil. syrBrn fiU DrilT
Mq'l Pha Ncv &I0 Rv ll I . nldrradoc
Whitc MBa Milt - Str&rd Operrting Stooadurcs
Book ll: Envimnmonul PrutactlouMtnuel, Sesdon 3,1
0l/l I Rovldonr Donlsonl l.I
Prge 28 of49 C
APpBr{DUtA (CONT)
DEI{ISON MINB (USa) CORP.
WEEKLY TAILINGS INEPEETION
not . -f.r8-l(Inupecroru: P,ie^,^ #ticr*ofirfrfier lbll)ay { hrrinPalr'
Call l: (a) Pond Soludou Blevation 5hle,37
O)mvlLBdoilrBlevetion
-55Y1-
(") oepttr of lVatotnbovoFML(i){b)) /#,fr,7
C,ell4A (a)Pond $olution Ehvatotr
O)FktL Bottm Elevatlon _5555.14_
(c)DeB& of Warer above FML (r|(b)
Cell 4B: (a)Pond Solution Elcv#lon
G)Ftvg" Bottqm Elovatioo *-5557,50
(c)Dcpth of Watcr above FML (r)"(bD
(d)Elcvation of Beac[ Arer wlth Hlghert Blevation
(monfiy)
Robctts
Pond: (a)Pond Solutim Elovallon
t. Pond andBooch
clovations (msl, fr)
8bAl.{s
O)FMlBottomElcvatiou 5-61?,9-
(c)DWth of ntatarabovoFl\dl. (CI-&)) ..,..-?*it
2, Slinres Druin Liquld Lpvde Cell2 Pump functiouing prcpcrty y'€s ..-
4S' $F". , nepttroLlquidp+puop
,.f,6. 76- rEpfitotl$idPof,t-puup
(all moasrucmenu aru dopth"in-pipe)
Prc-punp lrcad is 38'-Dopth to Ilquld Prupump =lH.,e
Poetjump head it 38' -Depth to Uquld Post
PumP =Jarg{
C.\DoqrG{s ryl tctiqr\dqrrtDMCtl.fl] $dthtnmlpfiiry hrrna pttsrtCurrmQdooltglrmY6stnftEry M$t $Frol !d DMT
Mm Pltn Nw 2010 Rv ll I - Rtduio,dos
lVhitc Meu Mill - Stsdad Oparating ftoceduus
Book l lr Environmonhl Prorction Manurl, $octlon 3.1
0l/l t Revhiort Denisonl 1.1
Pqsc 30 of49 r;t
7. ContartrinrtcdWNsEDurup:
If Ccll 4A bak detootisn sygtcm lovel rmcccdr 12 inohee above Se lowrst point on tho bofiom flexiblo
mombrane lincr (elcvuiou 5556.14 anrsl), nodfy eupcrviror of Mill managcr immedirtcly.
C;\Doaropnr axl $ulAilautDMc:llacrl scftrg\Tsrnp0Hry Intmru Filse\CorrHltosufifvM3YostnTill08r ME I syilffi r$d DMf
Mor Fhn t{ov 20lo Rv I t I - Rsdttrrl.d,oo
,;l*1.(.*,
APFENDTX A (CONT)
DENISON MINIS (USA) CORP.
WEEKLY TAILINGS INSPECTION
o*n,:;k 7#.:11-Inspectols :, - l6.q:t t *,,, --Pa l**cr*:-
White Mesa Mill - Standud Oporating Proceduree
Book I I: Environmental Protsction Maiual, Ssctiort 3.1
OUl I Revision: Denisonll.l
Page 28 of49
--S"$Jt.1L
_5397
-*-/l:*-_5555.14_
-4^-
_,.. -..._5557.s0
l. PondandBeach
olevations (msl, ft)
Cell 1: (a) Pond Solution Elevation
(b) FML Bottom Elevation
Cell 4A: (a)Pond Solution Blevation
0)fML Bottom Elevation
(c) Dcpth of Water above FML ((a)-(b)) - " lS.q{t ",.,
(c)Dop0r of Water aboveFML (a)-(b))
Cell 48: (a)Pond Solutiou Elevation
$)fML Bottom Hlevation
(c)Depth of Watu ahovs FML (a)-O))
(d)Elevation of Beach Area wi0r }lighest Blevation
(monthly)
Robere
Pond: (a)Pond Solutiou Elevation -., 5lt8-13_
(b)FMlBottom Blovation
-561?.1-
(cin*ptt,ofWateraboveFML((a)"(b))
-
.6*L9-
Pump functioning properly2. Slimes Drain Liquid L,evels Cell2
(,ovl* ,wl Tcrfi*,.*. *alt baca.ust*
thr* .fli'oaat rcl,ev.r! ta+t L'A,S
ba:3 Ap^,*.
Dopth to Liquid Pre-PumP:*-DePth to Liquid Post-PumP
(all measurements are depth-in'pipe)
Pre-pump head is 38'-Depth to Liquid Pre-pump =
Post-pump head is 38'-Depth to Liguid Post-
DumD =
C:\Docunronts arrd Settllgr\dturk.DMClLocal $ettingtYltmporary btcmot Frlst\Contant.OrrtlEok\VMlY6S I I\Trlltngl Mgnt Sysem and DMT
Mon Plarr Nov 2010 Rv I I I " Rcdline.doc
S,hiE Moga Mll - Sundard Oporatlng hocodunc
Boot I l: Err,ironmnd Prouotion Marurl, Scction 3.1
7, CouEmtnstedWaste
0l/l t Rsvisionr Dcnisonl l.t
PIstSO of49 r
ow*0-! ool
r'J Sof,ir Does Lovol oxoesd 12 inctrs abovo the lorrttt polnt ou tha bottom flcxtblo rnomb4p linor (eolution
slevation sf 5556.14 am*l for Coll4A a;d 5558.50 for Cell4B)? J,.#ho
-
)6s
If CeU 44 lcak dctsotiou sytEm Isvol exccedr 12 inches abovo tho lowust point on &o boftom flotiblo
ncrnbmnc liucr (elcvatlon 5556.14 ffiEDr notify upwleororMlll manrge*immediaEly.
clDoflffie ud gcttrpuildrDMc{.d0dltdngrYknpfiry ht*ncrftu\osrFnt frrto*IvMlYd$lluuliua ug* $yeht *d DtrlT
MmPhnt{svtrOl0Rv lt I -RtdUnuhc
(
WhiaMcolMill - Standart Oirudng Pmsodurcs
Book 1l: Bnvhorunental Prmcofion Menual, Scction 3.t
0l/l I Revtslon: Donieonl l.l
Pago 28 of49
AP?ENDT'( A (CONT)
DENISON MINBS (UBA) CORP.
!\IEEKLY TAILINGS INEPBSIION
1. Pq,od g11dBerqlt
elovadous (mal, ft)
Inspctou, 4,n.^ l'l"tl;fu, funrh Pol^r,
Cell t: (a) Pond $olution Blevation
(b)FMLBofiotrrBbvation ,,----J591(c)DcpthofWalcrabovaFNIL((+(b)) lE.q2 ._
Cell 4A: (a)Pond Sohtion Elevation
O)FML Bousln Etevadott
5580.7:5
(b)ItrdlBctouBlevadou 5557.50
(c)Deryt6 of sratcr abovo EML (offi
(d)Blovuion of Boaoh Arlr wih }Iighcst Elcvdion
(c)Depttr of Watc( rbove FML ((a){b))
Coll 48: (a)Poud Solution Blavation
(mffithty)
Roberts
Poud: (a)Pmd Soludou Hcvadon
(b)Fktr Bottou Blovatioo
(c)DEpft of Wator &ove mUL (q).(b))
-5555.14*
*tk.u,#- s6L?,9-6.3A_
2. SHmel Ddn Li$ddl-cwls edl 2 I\lmp ftnctioning Eropeily j, *t
toUquidpn+'pump
pth !o UquidPoet{unp
(all moarurcmcntr arc depth-in-pipc)
HHn head ir 38'-D6pth to Lrquid h+purB =
Po$aump tnad iB 38' -DGp& h Liquld M.
purop= Je"55
C;\Documarts ryrd S.dotptdnllcD,M61"0cd Eedhf\ltanponry IEt trlct Hl6s\Corffi,Oltlooh\\D{tY68lttlld[nE Mrnt Syrts[r rnC DMT
Mon Plm t+ov 2010 Rv ll t - Rtr{hq&o
lilbitc Moea Mill - Strndard Qperaring Procedrrar
Book Il: Brvhonmcnul Proteotlon Manual, Scctlon 3.1
01/l I Rcvlsioru Donieonl 1. t
Page go of49 t'
Contauriuatpd Wuto
Doel kvel exceed 12 lnchee above tho longt poht ort tlp botom
If Cell 4d leak detcctlon sysem lcvcl exoocds 12 inoh* above tlro lowost point on the bottom flsxiblo
mcrubrane Unr (elevsfion 5556.14 a$Bl), uofiS supuvisor or Mlll managor imrusdiatoly.
G\Doomcffi idsottrgs\fiutDMcu..crtscsln&fltmDor#yhtsradHl.E\oonhllf,OctloohVM3Y6sll\Trlltrgr M$rgyoE,r rU DIdT
Moo Plil }.trov 20t0 Rv ll I , Rcdlluo.dw
rnorubrrne linor (soludon
-{-oo
-ws
(
olovatioq of 5556,14 ausl fur CoIl 4A E d 5558.50 for Cell 4B)?
WhitoMera Mill- $tandad Oprtting Pruoodtnrs
Bootc I Ll Emvlrorunentel hotactlon Manud' $oction 3'l
0I/l I Rcvlsion: Denilonl l,l
Prgo28 of49
l, Pond andBoanh
olovafiong (mel, fr)
APPENDIX A (CONT)
IIEf.lISoN II{INE$ ([ISA) C!}Rp.
WEEffiLY TAILINGS ITiLSFECTION
Coll l: (a) Poud Solution Blsvation
(b) EMLEottomHevetion
Inrpectors; drrr.. ilr.rrortlG+-mr^z-hr,BpA
..,,,J6lero_,,.
__ _559?_
(o) Dcpth ofWaerabovoFML(a)-(b)) -,, lq.lo
Cell4A; (a)Pond Soludou Blovation
(b)FI\,fL Botom Elevation _5555.14-
(c)Depft of Wator aboveFML (a)"(b)
Coll 48 : (a)Pond Solutton Blev*iqr
(b)FML Bottffitr Elovadou . .,.5557,50
(c)Dopth qf lyafer abovo fh,IL (a)-(b))
(d)Elov*ion of Beach Aroa wifr llighoat Elevation
(mooUrly)
Roborte
Poud: (c)Poud Solution Blcrra{on
O)FMLBofionHevnriou
(o)Dcptr of Wdor aborra FIvIL (a)-(b))
2. Slinrcs Drain Liquid l*vele Coll 3 Pump tuucflouiug proporty V".
PF'tts n€pfttoLtquilPrtPump
et . r" Ibpg to tiquid Poat-pmp
(rll moasuwurouts aro dapth-in-pipc)
ho-pumpheadir 38'-DopUr to LiqddPro'gump -
tA.E5
Port-prrmp hoad is 38' -DGph to Li$id PoBt-
pumpa-t8*5
Cr\Documutr End $canlr\dtrhDM6ld.$l Sarbp\Tcmp*uy Inuffixt Fltor\Cmtfit,Oilo0k\ln{3Y68lfilUlhsr Milt Snrm ud DMI
Montur Nov20l0 Rv ll I . Rallhtloo
,,, +d612.3-
7, CmtaminatodWastsnump;"- D*xmP l""ls G.i.J ,,
White Moca Mill - Sundrrd Opurting Frocoduros
Book lL Bnylrcnnenhl hotootion Mdnual, Section 3.1
0l/l I Rcviglon: Denisorrl l. I
Pago 30 of49 f
* Does kvel qxcecd l? inches ibow tlro loweotpoint on tle boUom flexlble rnemlranc linu (cohfion
olovuion of 5556.14 amsl for Coll 4A and 5558.50 for Ccll 4B)? / -no
-
ycs
If @l aA b* dotoctisn Byctem level exooode 12 inchcE above the lowest point on tho bdbm floxibh
mornbrrano linor (clwation 5556,14 amsl), notify mpcrvieor or Mi[ managor immodiaEly.
G\DmmooE otd qtngt\du*,.DMClllocil S!trrtp\tunponry Inma Ftloot&nrentOslffi\vtvllY$lnTlur$ l{mt s:rrm rnd DMT
Moo Prd Nor, 2010 Rv I I I . RrdlLndoo
(
White Mesa Mill - Standard Operating Prooeduro$
Book I l; Environmentd Protection Manual, Sectlon 3,1
0l/l I Revision: Dsnisonl [,1
Pago 28 of49
_ . /u-/A _
_5555.14-"-.
" 558l.rL .".
-55s7,50
Dat*:J:JA:L!-Inspectors: da*d(*-.-&lr**.r*r.^,,hr tletti J"7
I,13.
_559'l
(c) Depth of Water above rML (a)-(bll -**i5*K
l. PondandBeach
elevations (msl, ft)"
APPENDIX A (CONT)
DENISON MINES (USA) CORP.
WMMKLY TAU,INGS INSPACTION
Cell 1: (a) Pond Solution Elovation
(b) FML Bottom Elevation
Cell 44 : (a)Pond Solution Hlevation
(b)FML Bottom Elcvation
(c)Depth of Water above FML (a)-(b))
Cell 4B: (a)Pond Solution Elevation
(b)FML Bottom Elovation
(c)Depth of Water above FML (a)-(b) . ,$..d**-(dlBlovation of Beach Area with HighestElevation
(monthlY)
Roberu
Poudr (a)Poud Solutiou Elevation
(b)FML Bottom Elevation
(c)Depth of Watcr absvc FML (a)"(b))
2. Slimos Drain Liquid Lovels Cell2 Pump functioning propert| *;{
ffi#,}ffifJJ$$x[?
(all measuremcnts are itepth-in-pipe)
iEru head is 38'-Depth to Liquid Pre-pump -
Post-pump head is 38' -Depth to Liquid Post-
pump= lA, l
*fi+"1 P-**g*rI 'fi33Y
C:\Docurnents and S€{tlngs\dturk.DMC\Local ScttJngoYfcrnpolary Intenrettrles\Conteilt,OutlookVM3Y6SlI\TatUn6s Mgnt Syrlorn and DMT
Mon Plan Nov 2010 Rv t I I - Redtine,doc
b_56
Wbim Mesa Mill - Stardard Operadng Proceduroe
Book I lr Envlmnumnml Protaction Msnual, Scclion 3.1
0l/l I Bariaiolt: Denisonl l. I
PacP 30 of49 (
7. ContaminatedWash
'* Doos lovel exceed 12 inctres above the lowost point ou the bonorr flextble membryne liner (eolutton
ebvation ot 5556,14 lmel fu Coll 44 and 555E.50 for Cetl 4B)? -{oo -
yog
If Call4A loak deEcdon eystem lovel orcee& 12 inchs above the lowertpolnt on the boffom floxtblo
memb,ruc lluer (elovuion 5556.14 rmol), nodfy supeMsor ot Mill mrnager irnrrudietely,
Cl\Docsmc# ind Sahtr$tdB*DMc{.ooel Sdrlafr\Tumpoarry lirflrnrot Fllce\Conbot.Outlodr\Wt3Y68ltwtI[t, Mtnt $yrlc6 md pMT
Mon Ptm lfov2010Rv ll I ,fudUtsdoc
(
Whltc Mesa Mlll - Standard fuouatitg Prcocdwus
Boolr I lr Environmental Pnotccilon Mrnrul, Ssction 3.1.
0l/l I Revision: Denisonl I'l
Pafo 28 of49
APPENDDT A (crlNr)
DEMSON MINES (UsA) coBP,
WEEITLY TAILINGS INBTtsCTION
Data: 6-17*2r,,Inspecton: ,RFrv., I ni,drno . ,€ T"Ht Holltddl
t. Po,ndandBmctr
clcvatione (ms[, fr)
CoII l: (a) Pond Solu6on Blcvuion d6H.oq
(b) Fl\{LBottomBlerration
-fr.517-
(c) Doptr of Srator abovoFMl ((a)-(bll ^, Jt-€-f-
CoIl 4A; (a)Pond Solutiou Hsvadon
(b)Ftl,tr EofiomElovadon ,..._ 5555,14_
(c)Depe of Wafior abovo EML (a)-(b))
CoII 48: (a)Pood Solution Elcv*io,n .6',0t 1 ,5 01 _
(b)FMlBffiomBlovaton
-55!7.50tcjoeFh of Waier abqva FML ((aXbE--{ q , og-
(d)Blovadon of Boach Arca with HigboetBhvailon
Gu
(o)Dopthof lYffirabovsFMl(a)-(bD ,6, *4 .-.
2, Slimce Draln Liquid Lnvda Call2 Puup hnodontg pro,party
iln.&ts *" 6rry9.^
Slme5 d'rb h n*rlhty
6hrne6,.(all measure,rncutr are dopth-in-pipe)
Pre.pump hoad is 38'-Dopth to Liquid Prc-pump =
Poet-pump hsad is 38' -Dcpttt to IJguid Poor
PUmp =-
ClDocnrncnr rnrt Sofrhls\dmdcDMolocd fuElnp\Tcmponry IntenrctF[lor\Coopf.QuuootriVl.I3Y68tl\ftI[ry M$t SpumuttlDMT
MonFhnNov2010Rv ll I -R*dllncdoc
(motrthly)
Roberte
Pond: (a)Pond Soludon Blevation
G)HUL BottomBhvatlon
Whia Me*a MU - Sundard Oporetirg Proccduos
Book ll; Bnvirunrrcrtrl Protection Mrnusl, S€ction 3.[
7, CouhminatodWacto
OUl I Rcvisiow Donisonl Ll
Prgo 30 of49 fI,
(
* Docs Lcvcl axcced t2 lnchcs abovc tho lowcst [loiut on &e bottom flexlble ntm$ane linor (soludon
elovation of 5556.f4 amsl for CEll4A aud 5558.50 for Coll fi)? .[l1- no -- ytg
If Cell 4A lodkdetecdsn eyrtom lowl cxooodg 12 tncles aboraa the lowestpoint on t]e bofiom flexiblc
mcmbrane liuer (ehvation 5556.14 amel), nodfy auperylmt or Mill mtrnagcr immodiataty,
e\Doerrmds r{d 8qilhg\dir*,DMCuiel Sqtilrp\ftmporrry hhtne( Rlccttbner*Ocd0on14{3Y6$lfiIU!ilt0 MB 9yac$ asd DMT
Mm Ptrt t{w ?lll0 Rv t I I . Rcdtnc.doo
Whio Mesa Mill - $uudard Oporating.Ptoccdure$
Book ll: Bnvironmbntal hofecdon Manual, Soction 3'l
0l/l l Revblon: Deniaonl l.l'
Pagc ?8 of49
AI?ENDIX A (CONT)
DENIS0N MrNES (USA) COBP.
WEEIftY TAILINGE INSPECTION
CEll I ; (a) Pond Solution BlEvatlon
O) FMLBofromElsvadon
(o) Dof& of Watrt above BML (a)-(b)
Co[ 4/q* (a)Pond Solutiou Blevation
(b)FMLBoftomElcvation
(c)Depth of Wahr abovo FML
Cell4B: (alPoud Solutlon Ehv*lon
(moutrIy)
Rpborts
Pond; (r)Pond $olutim Blevafron
O)BML Bottom Eleynflon
(o)Do,pth of Wilcr abo,e FI{L ((aXb))
-5555.14-s580-97
tu
Inrpectorer -lir,/l:j* . P*lr,*.qr r,, frrYr' * SaLi 4r&
5t tl" 8ql. PoodandBoEotr
elcvadonr (mel, fr)
(b)FMlBothmElovatiou
-5A57.59-
(e)Dcpth ofWater sbovoEMl (a)-O)) .-'*)L)J-
(d)Elovdon of Bcach Amwith Higbost Elovadon
2. Slim* Draln Liquidlnvela Cellz Ptrmp ftrrrctionlng proptr\y *d
(all rncasrurmenm arc d6pth-in-pipe)
tryflt"ad ie 38'-Dopor to LtqsidPre'pump =
ilHTAStr 38' -DePth tolrsuid Poet'
C\Docu:afio ud go6hgEld[rrt,DMcllrcnl Scrtlngs\Ilempcuy tuurtctFtlcr[ormt.OurhoftlVlt3Ydlll\Tdllng Mltt SyDtffi add DMf
Mm Plm ldov II10 Rv lI t - Rcd[ilo,(ht
O
Wlrirs Mo*r Mlll - Sundrd Opandrg Prrocedurst
Book ll: Bnvirfirffinral hotectlon Mrnud, Saction 3.1
7, Cqrtaruinated Waslc Duwp: .Ut''. L a r' 8.9 /^.*,oel "-,,,
'i Doe0Inval cxoeod 12lnches abovo the lowcst point on flro bottom ftexiblo rrcmbrano liner (eolution
olevrtiou of 5556,14 omrl for Coll4A and 5558.50 forCell4B)? Jg-A6
-
ycE
If Coll 4A lask dseotion eystom lwol eercecds l? iuchee aborre 0ro lowoot piut on tho botom floxiHo
mcmbrans Iinor (dsvadou J556,14 insl), nofrfy rupwtoor m Mill manqgor immcdlatoly.
f
0l/l I Rsvitlonr Denieonl l.l
Pags30 of49
(
C,\Do(irffi ild $athgrtdurr,DMc1l,Gal SEBtUE\TtnrpotEy bhrut EhdPoror$"O{{ootlYuSY$lnTdlht' M$t Sydeor anl DMT
MooPha l,lov2010Rv Il I . Rldlhc,doc
Srhito Mosa Mill -Studtd Oporuirg Pmapdwcr
Book [ [: Envtrurns[tal hotsdion Mmusl, $edtion 3.1
0I/l I Rsvirionr D$ti$onl1.1
Prgo 28 of49
t, Pond and Beaoh
olovatone (msl, fi)
2, Sllmes Dnin LiquidLovolg CeIl 2
APPENDTX A (CONT)
DEM$ON MINES (UsA) CORP.
WEEIilY TAILING,S INSTECTION
Ccll4A; (t)Pona $olutiop Blovrdon
(b)EML Botour Blevrtion
(o)Deftb of Water abova FML (r)-(b))
Cell 4El (a)Pooa Solution Elovation
(uourhlv)
Robcrts
Pond: (a)Poud Solutiou Elcv*ion
(b)FMLBottomElcvaflou
(c)Dopth of Wator aborc mvIL (r).O))
Sifio. AQ
(b)FMLBfrtonrBlevatim
(o)Dcpth o'f Wffir above FML ((&)-(b)
(d)Blovatiou of Bcmtr ArEs witr Highoet Elcvation,44
Inrpccton: l ,ir.l,*, Pa.l. <r, T*^rrq* tlo*toLa7
Call l; (a) Pond Solution BlcYuion .adl,lf
ft) m,U. Bsttom Elovation .,.--5597-
<c) Depth of lYatcr abovc FML (a)-(b)) *-JlC.-65-
-5555,14-
Dr*l:rfi_
Pump tonctimingprop **
-d
Depth to Llqutd pn "pump
optr to Liqtrid Post-pumP
(all naasuromonts are dcpth.in*ipo)
HflHf* ie 38"Dopth to Ltqutdftp-pulry=
Port-pump lcad le 38' -Daph to Liquid Poet
PumP = -1fr,,!8
C\Documiltr rnd Scdtr1ltdru*.m{Curc5lscoh3t\TE upor*ybtruuctF[bs\CoamntOr{oolrlvtylSY6gtnlhl[ogr M6fl symumd DMT
Mon Plur l,lov 2010 Rv ll I - Rcdtae.doo
Whito Maca Mill - Stildard Operuing hocodwc
Book lI; Environrncotel Prctoctiou Msnuql, Sectioo 3.1
0l/l I Rsvldonr Donisonl I. I
Page30 of49
t,
7, Curtaminrted Waste nump, [+e E-J 6^a A. --
* DoaE Lovel exceed 12 lnchog abovo tho lonret polnt ur fre bottom flcxiblo mombrano liuec (roludon
elpvatlqu of 5556,14 amsl fm CcIl4A and 5558.50 for Cell4BX J,,ao
-
yGs
If CoIl 4A leah detecdor systsm lovol oxc*sdg l? inctreg above tho lowost point on tho bottom flexible
rucmbrane ltner (elewffsn 5556.14 amrl), notify rupcrviror s MiII rn nagpr immediably.
Cr\Domrnuts rad gcfihFldrukDMclldof,l Setlq$Trmporrry htcnanl0e[w,Orflooltw]AY6$tlt'lUlng! M3rt sydim md DMT
Uen Ptro Nov ?010 Rv I I I . Rsdlinc.doc
(
Tab B
Tailings Pond Elevations
2nd Quarter Elevations
D.ele
Free. Eoard {
41112011
4t8tm11
4115t2011
AlZZlZOtt
4129f2011
5tw2f11
511U2011
512012011
5/2712011
eBE011
atl.otgfJ11
alfiEol1
aleqlzo1t
7l't12011
GelLl.
56t5.lo
5613.39
5612.69
5612.62
5612,68
5812.77
5612.52
5612.87
5612.41
6012.32
5812.20
5612.I2
5612.04
5e11.89
561 1.65
Cell 3 z Foherts Pgnd Ce[ 4A I 9p-ll 48 4
6808,80 60e4,00 6600.74 5694.60
No longer required 5619.6 lnadvertentlY
*
lnadvertontly
No longer required 5620.3 omitted *
Inadvertently
No longer raqulred 5620.5 omittEd t
lnadvartently
No longer requlred 5€90.8 omltted *
lnadvertently
No longer required 5621.0 omltted *
lnadvertently
No tonger required 5621.3 omitted *
lnadvertontly
No longer required 5621.5 omittad *
. lnadvertently
No longer requlred 5619.0 omitted i
lnadvertentlY
No longor requited 6618.6 omltted 5580.76
lnadV0ItentlY
No longar reguired DRY omitted **
lnadvertently
No longer required Dry omittbd 5581.11
Inadvertently
No longer requlred 5619.1 omltted 5681,59
lnadvertentlY
No longer required W omitted 5580.87
lnadveftentlY
No longnr roquired Dry omitted 5580.69
* The wastewater elBvations wtre not measuted in Cell48 at the boginning of the qu$ter bscauso ttre fluid levols
were below tho ths level at whish tho survey can be sonductod from the bank of Coll 48.
** Ths weekly nreffiuromont for June 3, 201I was not conducted during the const$ction of a platform and walkway ,
MeaEurexrnt$ resumcd the week of Junc 10, 2011.
t Frreboard as permitted under Llconsa condition 10.3 is no longer applicablo to Cell3 or Cell4A,
zCeU 3 is nearly ftrll of solids, is undergoing pro-closue stepe, and the freeboard ltnrit rpocificd here is no longer
requhed and tho weekly measuremonB arc no longer rcquired per the January n sfrMarsh 14, 201I lettors from
DRC.
5 The fteeboard limit for Cell 4A ie not sot out in the Licenso. The freeboqd limit of 5,593 .74 fwCelt 4A is eet out
ln a lcttor from the Bxecudve Secr+ury datrd Novembor 20, 2008. Denison proposed in ttre DMT Plan reyision
datcd November 12,20L0 the rcmoval of tho frooboard timit for ColI 4A to be replaced by a freeboard limit for npw
CeU 4B that wilt accomrnodate ths ffeebqsrd requiremenE of Cells 2,3,4A, and 48. The Bxecutive Sooratary
grantod'a varianse ftom the Cell 4.{ freebosrd limit on January 13, 201I and approved ttre removal of the Cell 4A
limit and the use of Cell 48 on Isnuary n ,2011, Ttre weekly moasurenrents are no longff rcquirgd for compliancc
with freeboard limts. The rneasurements havo resumed in Q3 2011 to complete the daily leakage rate for Cotl 4A.
a The freeboard limit listed is tho value specifred in the DMI plan whcn the pool surface area is 40 asr€s. A pool
surface trea of 40 acres is ugcd because thers ars no boaches prcsent in Cell 48 at ttris timo.
DENI$OND#d
MINES
Oenleon Mlnes (U$A) Corp.
1050 17th Skeel, Sult€ 950
D6nver, CO 80265
USA
Tel : [phone]
Fax : [phone]
www. donleonm ine s. co m
January 10, 201 1
VIA E.MAIL AND OVERNIGHT DELIVERY
Mr, Rusty Lundberg
Utah Departmonl of Environmental Quality
195 North 1950 West
P.O, Box 144A10
Salt Lake City, UT 84'l 14-4820
Fle: State ol Utah GrounclWater Discharge Permit ("GWDP") No. UGW370004
Transmittal of Revisod Doouments Addressing White Mesa Uranium Mill Now Cell 48 and Response
to Divi$ion ol Radiation Control ("DRC") Lotter of January 6, 2011 RogarcJing Comprehensive
Commonts on Proposed Revised Plans
Dear Mr. Lundborg:
This letter transmits Denison Mines (USA) Corp's proposed revisions to tho Tailings Management System
and Diseharge Minimization Technology Monitoring ("DMT") Plan, and the Best Availabla Technology
Operations and Maintenance ("BAT O&M') Plan for the White Mesa Mill which are currently pending UDEQ
approval. This letter also responds to DHC's letter of January 6, 2011 requesting additional changes to
prCIviously submilted versions of these documents. Per DRC's lotter, we understand that lh6 Contingency
Plan will be addressed separately and charrges will not be tied to approval for use of Cell 4B or the New
Decontamination Pad.
DRC received the Octobor 11,2010 letter requesting changes to previously submitted versions of the DMT
Plan BAT O&M Plan, and Contingency Plan, To addross those comments and other changas necessary for
operation of Cell 48, Donison submitted on Novembar 12,2010 redline and clean copy revisions of those
documents entitled DMT Plan Fevision 1 1, BAT O&M Plan Revision 2,0 and Contingency Plan Revision 4.0,
DRC reviewed those submittals and requostecJ additional changes to the DMT and BAT O&M Plans in the
letter of January 6, 201 .l . Donison has accepted all the changes submitted on Novembor 12, 201 0 to create
new black-line copies of tho DMT and BAT O&M Plano, and has prepared tho additional changes, in
response to DRC's January 6, 20'l 1 letter, as redlined markups, entitled DMT Plan 1 1.1 and BAT O&M Plan
Flevision 2.1, These rovisions have been provided, respoctively, as Attachrnents 1 and 2 to this letter.
For ease of rsview, both of the revised documents have also been provided as clean file versions with all
changos accepted. Denison requests that UDEQ review and approve the versions attacho,d to this letter,
which consolidate into one set of documonts all changes subrnitted by Denison sinco Septomber 2008, for
which Denison is awaiting DBC approval.
N:\Cell4B\January 10 2011 Sulrmittals and Flevisions for Cell4B\01,10,11 Transmittalto DRC Plan Flevisions for Cell
4B.doc
Letterto Mr. Rusty Lrndht
January 12,2011
Page 2
We have also provlded, below,'specifio responses to Each roquest ln UDEQ's January 6, 2011 letter. Tho
sections and numherlng of the remaindor of thls letter follow the DRC January 6, 2011 lefier, Each UDECI
request iq shown in italic6, below, followed by Denlson'B r€sponse.
DEO Gommcntc ond Beeponses
TheContingencvPlanlLl!-?9,l0Havision:DUSAA
Pleaee bQ aware thtat in oider to expedlte the Celt 48 review pracese, lhdt DRO, review of the Contingency
Plan will M addrcseed under separate covdr, procead independently, and not be tied to the usd of the NDP
nor Cell 48. The lollowing is noted for luturc retarcnce:
A. ln tha subjeot Novemher l?, 20ti0 lettor, DUSA providas proposed rcd-llnd and clean vorslons
of the Contingency Plan version notad Which lncluda aspeots ragarding Call 48.
B. The thifi paragnph ad wallas Section 2 .a.1 of a September? ,2010 UUSA lei,ttor drsouosos
mntingency plan ffimmdnta in our May l0,20lO latter.
Denison Responsel No response required,
The DMT Plan fiU20-!9_Bevision: DUSA-ll
1, We acknowladga a extion of pangraph 3 .1.e.i.D hae been changad approNiately to read that, u, , ,
The dppth to water frum th.e tep . . . of any of the three (3) obsaruation ports to tlw etanding water
thAll be no lass thah 6,2 faeL" lt appearc that inogrpotatlon of this itam into an Mproved DMT
Pldlrl woald bomplete ff6 issqes regading ttte NDP wlth rcapectto DMT Plan adJuetments,
Denison Reaponee: No responee requlred.
2. Tha DMT Plan (as well as tha O&M Plan), incorporatlng naaessary iteme lor Cell 48, must h€ aryruved
prlor to DRC authorization of use for Cell4B, Regaldlng fraehoard requlremanls, tha Plans propasad by
the eubjeot DUSA Novenbar 12, 2010 letter make the assumptiofi that Cell 48 is ounarttly authorlzad tor
usa, and it ie nof neceeeary'to establieh a frcaboad for Cell 4,A. However, this is inoerrcct. Thls
apprcaofi DUSA haa taken eppeare to flecese/tste ane of the followlng:
a. That the last dotion priar to authorizing uso of Cell 48 muet be the approval ol the DMT Plan (and
thaO&M Plan), orb, To obtain approval of the DMT and O&,M Plans now, DUSA o'hange tha plans to establiah tha
freeboard for Cell 4A. to be one ol the lollowlng, eithen
(1), The tked freeboard elevation for Cell 4A, esteblishod by the DRC fraehoard
variance letter ol Novemhgr N, ?NB, or
(2). Changethe ounentfreeboard datermination vefulage prcposed in fltase Plana ba more
robust. This wouW include that the treeburd for Cell 4A or Cell4B, as may ba applicable, wottld
ba eetablished by tha rlgorwe freeboard calculatlon mathod outlined ln tormar prcposed Plan$,
but woutd be written wih that if Cett 4B becomda approvd, that the fiadboard determinatlon
method would rto longar he neodod for or apply to Cell 4A,
Plaasa pmvido DRC your dacieion to us in thld regard, tryether wtth any and all neoteeary
conasponding changes to the DMT Plan,
oHN'soJy/n"' 'fttlNHg
Letterto Mr. Rusty Lund;
January 12,201,1
Page 3
Denison Responae: Denieon has ohosen optlon (a.) above and wlll requaet the approval of the DMT Plan and
the O&M Plan as the last action prior to the UDEQ authorization for the uee of Cell 48. As such, the changes
requ€sted regarding the ralntroduction of Freeboard llmits for Cell4A are not necessary.
3, ' The following changes in DMT Ptan forms, rutated to taillnga beach elevations, arc nbadad dua to the
need to medsqre beaah elevatlond ln tallings Cells 4A or 48, as applicahle ( per pamgraph 2 above),
Thle lelerua wae bruught to your Attentlon earliar in our lotter dated Ootober 11, 2010, The freqboardtor
tfieee ponde is detsrmined,trofi the uee ot such (see paffigraph 6:s and Appendix F of tha DMT Plan):
a. On page EA of 49 in Appendlx A of the eubmitted clean copy of tha Ftan:(1) -The headtng numbared as onet neartho left marginbn that page; musf st€f€ nPond artd Beach
alevatione . . . ,u thl tollowing oarlier propwed DMT Plan vercions also contalned tfiie ptpvlslon;
(a), lilo7 Fdvleion: Danisoi-7,
(b), 0S/OS Hevlaion: Donison-1, and
(c), 3/t O Revision:Denhon-9,
(2) ln thd conespoMing page otthe eubmined rc*line vdrclon ( i.d. paga 3A of 56), ftam number
one contains sections for Cell 4A. and Cell48, An ltern (d) etating'Elevatiort of Beach Area with
the Highast Etevation(monthty),, must be added trto tta eeaiois ut thie page lor eaoh ot
thase aells, a$ Appilhabla with parugmph 2 above, (Earlier proposed DMT Plan vdrcione
contain tlris item (d) forOell4Ai in the veraiona glvan in paragraph 3,a, ahova).
b. Swtian.g:l.d,vii, Fflr€f,lflph G shoutd be tdbeted ae.paragft,ph E, Thie tittq,of .tttt# peragruphshould ber0re[,47,or,4, aoaqh'Elevatrbo'qs neede.d and a@iiaitble with pa.gmih l'pboid. Tha hodll of llnt
plragtapn Qhotild lndlcata thattlle beach elevathn Buruey witt be ifl C.dtl 4.A, or Cell 48 as apitlcable.
(ll0ui1.48 !@Prye.s.?ppmved tor use, it then wlll be is no longar t ece66a,y to e;stablish hoehoatd
elevatistt tor Cell 4A).
Denison Responee:
3,4,(1) The headlng has beeh changed as requested
9.a,(2) The reguested toxt 'Elovatlon of Eeaah Area wtth the Hlghest Etpvation (manthly),n hag been
added to Oell 48 only. As prevloualy stated, Dsrtison ls requasting UDEA Approvel of the DMT Plan as
the hst aotion prior to the use of Cell 48, and ae euch the requested ohange to the Cell 4A weekly
inEpection is not neceseary.
3.b. Soe response to 9.a.(2) abovo.
4. Pleada coneot mlsoellaneous errorct noted at the tollowlng hcatlone on tlp suhiect aufuiltted redline
DMT Plan oopy;
a. The third paragraph of page 2, and in pangryh a) below it, ihe detethn and relocation ol a
centonce i0 effoneous,b, Laet paragnph of page 3, the elevatlona listad for the lowest polntd on the flexihle membrund linete
for Cells 4A and 4E oontlict wtth thd alavations lic,ted tn Appendlx A (page 93 of the redllna copy) for
Celle4A. and 48,c, On page 1l heading lll, (ueed for the Roberts Pond) ehould ba a heading lV,
oEN'soJ)ll
L€tter to Mr, Husty *r;rg
January 12,2011
Page 4
d. ln Section 6,3, the flfth pangraph, the frrst numbdr in the parenthetlcal phaoa appears it should be
40 la;ther than 45.72,e. On page 28 of the olean copy, conesponding to p. AS of the rcd-lino cpW, for Cell 4A the FML
bottom elevation line neede to be ight justified,t. On page SS,paragraph number 2 , the statement nPump Timer set at t5 mln on ...,n negds to be
daleted,g. On pago 36, tho alterlgk footnote shown refers to an elevation whiah appars to dpply only to Cell
44. The loofioto ne66b to b ac$usted eomahow lnclu* tho ehvation tfiat qplldd to Celt4B ae
well.
Denieon Response: Theee changes have been made ln the attached DMT Plan Hevleion 1 1.1.
The Cell 4A & 48 Q&lt,Plan. l|/Eotl RevldloL.2enipn 2.0. of the submittad re&line oopy;
t, Figure 68 doed not Mlaw tho same togh as Figure 0A 1,e,, the low*Bt FML elevation above the
eump level ia not 1.i-feet above tha dump bottotn (for the |?-lnch diameter aollectisn plpa) as in
Figurd 64. Pleaee explain and lustlly thie difforenae,ll, Qn pagd I l, ln two separate pafagraphs numborod land 2, thd eecond and the laat edntenca
rcdpdclively, cpntairt a parenthatlcalphaaethat mustbe deleted or adiusted, ao it le lnconect.lll. On paga 14, in tho thir.d oentanca the parenthetical phtead muet be deleted or adl4dtad, as il is
lncorrect,
lV. Alsp, on Wgp 14, the eecond to laetsentonp lrcm the bottom ottho pagie, heglnntng with, "Each. pumpisequippedwitfi,,.,ura,brtfrod6tghoeo of 2.25faetand*,.inphie, Iff'eoa.Uistgnaos appearto
npt Peaffilitiabte tpr tnd hlt48 eump Cnd reopactinB Figure 6Bt Pteaae revtsa thie gqntrlni* and
orfigufo, to M frrnectfor Sell 48 as weil,V. 8n page 15, tlte lepf aentenoe'of tha fircrpangrorph on that page muet speclfy what Figuru il refere
to,w. 'FiSe ,l7, tha thlr.d:piragnph sfatep,r Condltton tolg etarep thAt...,' howaver, cunent Licene;e
OsndltlOn 10.8:daas rtol iErte tfie verblaga lubted aftor thdt sentenca. Plpigsl s61rtt th.ip pa;ragru,ph
with fltg prqer refercnogg and verhlagd, as applidable,
Vll, B,ggthnlng on pege ln rewrite the eet/rlon of the A&lt Plan tltl#'Call 4A Solalion Frqe@Ard
Calealatlon,r including'ttw titte:of that siction. Thiswit! need ta bd done acr,odrirrg,to DtlSAie
app,llcation of thi paragraph nutnbercd 2, under the DN(T Plan @mmdnt seotiofl of thle letter.
Vlll.Pleaep coffeot miloella dotls e;rroet noted atthe tollawlng loeetions on the eUbtect r.ad-linad oopy of
tha Cell 4A and 48 BAT O&M Plan:
a. On page 6 , paragnph .2, add a sentancd which desatibee that the non-woven gaotextite
materlal ls aleo overlain at the dufiaca by a woven geotextlle fabric, whioh is ballaetad laterully
hy sandbags on eadr side of the baakbono gravet berm.b. Tl:e above item also must ba added to paragt€4ih e.2 on page I aN 4.c. On page 6, paragraph e.3, Elso aN a eentdnce which dasaribeg that the non-wovan geotertila
mabrtd rb a/$o overlalfi.at the surtace by a woven geotextile fahilc, wltlch ie ballasted by
sandhago,d, The ahovd ltem aleo muet bo aNN topangmph o.3 on paga 4.e. Page 2o, antry I I on the Attachmente list neede to he updated, and the sentence ended with*DMT Monitoing Plan,'
Denleon Responae:
OENIBOJilI,:'f,ilNE5
Letter to Mr. Husty Lu
January 12,201 I
Page s
ondberg
l, Figure 68 le correcl. The lowaet FML ahove the sump level le 2.00 feet for Cell 48.
ll, Thie phrase hae been deleted from both paragraphs ae requested'lll. The phrase haa been deleted as requested.lV. The iext has been conested to refteot the actual conditione ln Cell 48 as ahown in Figure 68,
wtrioh is correct.
Figure 5 was relerenoed in the previous version and no conection is reqUlred.
The correst verbiage has been added'
See reeponse to 3.a.(2) above.
Iteme aihrough e have been coneoted or amended ae requeeted,
Please contaot the undereigned if pU have any questlona or requlre any further information.
Yourr verytruly,
Deurson llneg (U$A) Conp,
Jo Ann Tiachler
Director, Complianoe and Permitting
so; David C, Frydenlund
Harold Fl, Bobertg
David E, Turk
K Weinel
Centralfilee
V.
vl.
vtl.
vilt.
OEMgOJil/
,vltNE3. " ' '
, Depnrtmont of
Environmental Quality
AmEnde Srnl0t
Wdfl4//N. ANW|
uwubn or nADrAtIoN coFrBoL'Rurty l+nOorf. Dtuaor
l,IdAIL
'. It{s.,Jo Arm Ttschlar
Uirector lgrnp{iance rnd Pormitting
Deulsm Miilas (USA) Corp (DU$A) .
l050,l7n gtrroq, Sutte 950'
uLnvcr.'G$',80265:.
i: :. . "DEor,lds'Tirchleft
..Aftpr Eviow of ttur plEa, .ue ha-vi no firrtts comrpotc, Tharcfor, dE'DDilT Ptin rt Uttdd lsrie{rrtF.
i,":'
tlT:AlI RADIATION CONTROL'BOARD
DA&dr : ,
Cs:', IfuaIdR. Robcils,DUSA.
etrUltrp qqlGr DRC
HSUS,*\ QlfDFq,olllDMT Phr lllBlcflD[fT Plm ContApplp],rl 0l-*2ol l.de' i ..,
l95.Norli'194;Wrtt . Sg Irfo gV, Uf '' MBiliu Ailtur; R,Q"Eor l,llEt0r8rll l.l]ptrty, Ut t4lta48r0
TEEprrfir t80l) re{-ilZrg,r h.r (80t) ttt4v, . T.D,D (tol) 536.44t4. rtuu,*4trlrA\tay
.. , .Prlilldoe lfll* rurpldPq*
ao
Tab D
Cell l and Cell 3 LDS Monitorlng lnformatlon - Second Quarter 2011
April2011
Cell Date
Measurement in
inches from
transducer at the
bottum ofthe LD$
sump.
Cell Date
Measurement in
lnches from
transducer at the
bottum ofthe LDS
sump.
Celll 4ltlz0LL 4 Cell3 4lLl?OLt Dry
4l8l20tL 4 418120L7 Dry
4lLslaoLL Dry 4lt5l20L7 Dry
4l22l20LL Dry 4l22l20Lr Dry
4l2sl20LL Dry 4l2el20tt Dry
May 2011
Cel!Date
Measurement in
lnches from
tran$ducer at the
hottum ofthe tDS
8ulnp,
Cell Date
Measurement ln
lnches from
transducer at the
bottum ofthe LDS
sumlr.
Celll sl6/2OLL Dry Cell3 sl6lZOLL Dry
5lL3lzoLL Dry slLs(ZOLL Dry
5l70laOLL Dry slz0l20Ll Dry
5127/2O1t Dry sl?u20L7 Dry
June ?011
Cell Date
Measurement ln
inches from
transducer at the
bottum ofthe t OS
5UmD.
Cell Date
Measurement in
lnches from
transducer at the
bottum ofthe LDS
sump,
Celll 613/20tL DTV Cell3 613l20tt Dry
6lL0/20L1 Dry 6lLA(aOLL Dry
6lLVlzoLL Dry 6117l?oLL Dry
6l24(ZOLL 0,7 6lZ4lZ0LL Drv
Cells X. end 3 LDS systems put into service on July 13, 2011 per 9/8/11 letter
oENrsohl)dd
MINES
0onhon illnar (U$A) Gorp.
10t0 17lh Streot Sulto 060
Denvor, CO 80f00
UOA
Trl :303 02t.7708
Frx : 303 t8M12!
www.donbsnmlnoo.oom
August 18, 2010
VIA E.MAIL AND OVERNIGHT DETIVERY
Rusty Lundborg, Co-Hxecutive Seorotary
Utah Water Quality Board
Utah Department of Environmontal Quallty
195 North 1950 West
P.O. Box 144810
$alt Lake City, UT 84114-4820
Re: Stato of Utah Ground Water Dischargo Permit ('GWDP') No, UGW370004 Whito Mssa Uranium Mill-
Plan and Schedule for Cell 1 lnspoctlon and Repairs
Doar Mr, Lundberg:
Rsforonce ls made to Denison Mines (USA) Corp's ("Doni$ofi's") notice letter of Juno 7, 2010 and tolophono
conforenoe with Utah Departmont of Environmontal Quality ("UDHQ') personnol on August 12,2010, Doniaon's
Juno 7, 2010 lottor provided a notice to the Executlvs $ocretary regarding tho discovery of fluid ln tho Leak
Doteetion System ('LDS') of the White Mesa Mill's (the "Mill's') Cell 1. This letter responds to Denison's
commitment ln tho June 7, 2010 letter and tho August 12,2010 phono call ln which Denison agreed to provide
UDEO a written plan and echedule for:
r dotsrmination of tho root causo,o identification of tho extsrrt of damage, and. oxecution and reporting of repairs to the Cell 1 llnor system.
Background and Design of Csll {
Tailings Cell 1 serves as the Mlll'o primary liquid evaporation basin. Coll 1 consists of the following rnajor
dosign elements:
Cross-valley Dike and East Dlke - constructed on tho south sido of the pond of native granular rnaterials
with a 3:1 slope, a Z0-foot crest width, and a crost olevation of about 5,620 ft above mean soa lovol (amsl).
A dike of eimilar dosign was constructocl on the east margln of tho pond, which forms a continuous earthon
structuro with the south dike. The romainlng interior slopo* aro cut-slopes at 3:1 grado.
Liner Systom - including a single 30 nril PVC flexible membrans llner (FML) constructod of solvent welded
ssamc on a propared sub-base. Tho top elevation of tho FML liner was 5,618.5 ft amsl on both the south
diko and tho north cut-slopo, A protective soil covor layer was constructed immodlately over tho FML with a
thicknoss of 12-inches on ths cellfloor and 1B-inchos on tho interior sideslopo,
1)
2)
Lettor to Rusty Lunclberg fdt 1 Ropair Flan
August 18, 2010
Pago 2
3) Crushed Sandstono Undorlay " immediately below the FML a nominal 6-lnch thick layor of crushed
sandstone was proparecl and rolled smooth as an FML sub-baso layer. Bonoath thls underlay, natlvo
sandstono and other foundation matorials were gradod to drain to a single low point noar tho upstream too
of the south cross-vallely diks, lnsido this layer, an oast-west oriented plpe was installod to gathor fluids at
the upstroam toe of tho croos-valley dike,
As mentioned in item 2, abovo, Coll 1's FML is overlain by a protoctivo soil layor. As a result, tho FML, and any
toars or damago to seams or linor surfaces, are not roadily visible. Thorough and completo lnspection and
ropair wlll roquire systematio romoval of the soil covor by section, and stepwiso inopoction and repair of
uncovered FML sections in a phasod approach, as discussod further ln the propoood repair plan and sohedulo
below.
Regulatory Framework
Condition 11.3 of the Mill's Stato of Utah Radioactivo Matorials License No. UT190047S (ths "Licon$e") requires
that the licensoo lmplomont a leak detection monitoring system for each of the taillngs colls. According to
condition 11.3:
(l) The licensee shall moasure and recorcl the "depth to fluid" in oach of the tailings disposal coll
standpipea on a woekly basis, lf sufficient fluld is present in the leak detection systom (LD$) of
any cell, the licensoo shall pump fluid from tho LDS, to the extent reasonably possible, and
record lho volumo of fluid recovered. Any fluid pumped from an LDS shall bo returned to a
disposalcell.
(ii) lf fluid is pumpod from an LDS, tho liconsee shall calculats tho flow rato by dlvlding the
recordod volume of fluid recovsred by the elapsed tlme slnco fluid wae last pumped or
lncreagos ln the LD$ fluid levele were recorded, whichover is tho more recent, The llcenseo
shall document the rosults of this calculation.
(iii) Upon tho initial pumping of fluld from an LDS, the liconsoo shall colloct a fluid sample and
analyze the fluid for pH and the parameters llsted in paragraph A of this llcense condltion, The
licensee shall dotermins whether the LDS fluid originated frorn the constituonts listed in
paragraph A of thie licsnse condition or has a pH lovel less than S.0. lf oithor olevated
constituent levols or a pl-l less than 5.0 is obsorved, the licensee shall assumo that tho dlsposal
coll is tho orlgin of the fluid.
Condition 11.3 furthor requlros the ongoing weekly moasuroment of depth to fluid if the calculatocl flow rate is
less than 1 gpm, ancl additional notifloation and mltigation requirements if tho rato is greater than 1 gpm.
Tho above requirement$ havo boon lncorporated into the Diechargo Minimization 'Iochnology Plan in $ection
3,1 of the Mill's Environmontal Protoctlon Manual,
Part 1,8.7(f) of the Mill's GWDP roqulros that the Permitteo ohall lnspect the liner systom at Taillng Oells 1, 2,
and 3 on a daily basis pursuant to the requirements of Sections 2.1 and 2.2 of tho currontly approvod DMT
Monitoring Plan. ln the ovont that any liner defect or damage is identifiod during a linor systom inspoction, tho
Pormittoo shall immediatoly: 1) report pr.rrsuant to Part 1.G.3,2) ropalr said defect or damago by
implornontation of the cunently approved Llnor Maintenance Provisiorrs, and 3) ropc;rt all repairs mado pursuant
to Part 1,F,2.
,)ltNl$ohtry,'f{$iMlhr[$
Letter to Ruaty r-undUai Qell 1 Repalr Plan
Auguet 18, 2010
Page 3
Seotlon 1.e.3 af tho GWDP requlrsa that ln the dvent that ho Permlttes falle to malntaln DMT or BAT u
otherwlgs fulle to moot DMT or BAT etandarda as requlred by tre Permlt, the Pennlttee ahall guhmlt to the
Exeoutlve Eeoetary a notlfloatlon and deocrlptlon of tho failure Eocordlng to RS17,6.6,16(CX1). Notlfloatlon
ahall be $lven orally wlthh 24-hours of the Permlttee's dlscovgry of the fallure of DMT or BAT, and shall be
followed up by w{tten notlfloatlon, lncludlng the lnformatlon n€ceEsary to make s determlnEtlon under R817*
6.16(CX2), wltfiln flve oalendar days of the Permltteo'e dlecovoy d thE fallure of beet avallable tefinology.
UDEQ hae not ooreld*ed the Cell I llner eyetem tp meet BAT mqulrementg and hm oxaludod ltfipm BAT and
DMT regul!'emontg ln the Mille OtA/Pp, Hence, DMT repoflng r€qulrsmEnte do not Ep€clflrally qpply to the GellI LDg, HorBver, Denlson choee to notlfy the Ex€cutlve $eorehry vvlthh 24 houra of the hiilal onset, WtdEplnne oall on June S, 2010, benEuse the fluldg ln th€ Cdl I LDS wBrB ageumed to rcpree6nt a potenilal lher
dd€at that requtriog notlcs under Part 1,E,7(0 of dre GWDP. The Hxeoutlve Seoietary repbtveO wrlttsr
nottfloAtlon wlttrln E daye of the lnltla! lnqldent on Junp 7,2010, Penlson also provlded E fulour-up verhal
notlfloatlon wlthln 24 houre d the recurence by phorre oall orr Auguet 8, 2010,
lnttlal ldentlficatlon s, Nesd ior Repalrr and Reeponre Aptlonr to Date
During the routlne talllngg lnspedlon poriormed at epgoxlmately 2;80pm on June 2, 2010, the Cell 1 LDS
sterilplpp waa observgd to have acoumulatod approxlmatalV 7 fest 6 lrtohas of llquld oompared to tha prevhue
dqy, The preoadlng day'e recorded obqerv,Eflon lndloatsd frrEt ths LD$ standptpe was *diy' (E meapured tevd
of 60 feet 4 lnchee). Sufflctant fluld hed aoanmulated by 8:Z6am Thursday, June O h permlt oollpctlsn of
samplea and lnltlal pH taatlng to.aeoqrtain whsth€r flre fluld orlglnatod ffem th6 oell. The tnltlal pH teetlng ln at
8:46am on June 3, ehowfd H Fl-l of I to 3, lndhatlng that ttre ilq-utd orlglnarcd fiom ths eoll, lnltlht noUsd lf tnn
?AwrflUlaflon of llgttld ln frre LP$ rlme glven by hlaphqne io the Unrtr peparUtrgnt d Hnvlronmontgl Ouallty
Exeduthrs Boffot0ry at 3i48pm or Thurtdsy June g, 2010 (wlthln E4 houre of the dleoovery and wlthln 7 hours
of determinathn of the orlgln of theflutd),
Upoo ttc€lpt of tfrp Inttlel hspepUon mtult, the Mlll's Envhonmenial Ooordln€tff notffled the Mlll Manager Et
3;00prn that day, The Mllt hok the fdlowttrg BtsFB, h q@ddrp6 wtth Lioenae oondltlon 11,s, the Mlll's Lln6r
MElntonance Provlrlons, and Seotlon 0.1of fire Milfs EnvlronmeRtalftotocthn Manual,
Tha Mil cdhdod eamplee and dupllcateg on Juns 0 for analyula at EnerBy Lsboraterleg and AmerhE West
4nal$lcat LabofEtofleg for the full eulE of gloundumtar pplnt of compllanoe anslytos and pammeterc.
CharaoterlzaUon reeulE oortflrrned that the Bource d the flulde ln the LD$ H talllngr eolutlbne,
Follodng the eempllng on Juns 3, the Mlll pumpod the LDB to dryneeE, arrd begnn msnltorlng the levelfiange
wlth tlmo to ettlmate aolutlon accumulatlon rats. The calculated ratsa esUmated from thls procBEB lndhated
that the solutlon accumulatlon rate dld not exoeed 1 gpm, and rargnd ffom approxlmataly 0.0$ to 0,5 gpm.
At the tlme the LDS level was noted on June 3, th€ Call 1 sdutlon levelwBB approxlmately Afi14,67 fuet amsl,
The Ml[ lorrered the Cell 1 eolutlon level durlng the month d June ln order to reidUoe or ellmlnats the fhv, hh
the LDS, and to alloriu Inepectlon and repElr d damage to th6 C€ll 1 FML. Tho C6ll I level wnE dropped to a lorvof 6013.40 feet amsl dullng thls perlod, Malntenancq ldentlfisd eome FML damago and performed rgmhg
during the p€rlod when thC level wss lowsdt. FollowlnU th6 r6p6lrg, the Cell 1 llquld levd war atlorrdd h
gradually r€tum to lte June 0 level, and the LDB rcmalned dry untll a reourronce of the LDS llquld levsl rame
ldentlfled on Auguat 7,
The Mlll expoflonced perlodlo tmavy ralne ln lateJulyand earlyAugust. Durlng theAuWat 1,2010 tailngr
lnepectlon, the Cell llguld level had reached 6814,22 f€ot amsl. At that tlme, the Envhonmental Technlolan
oEryreftPl/ftil.,3
Lettor to Ruoty LunOUergCell 1 Repalr Flan
August 18,2010
Page 4
ldpnflflEd thqt ths LD$ had an obsenrahH llquld level, Llquld samplm und dupllcalea'were once egnln colleded
and ahipped for onalyeb, srtd pumplng end estlmsdon of the to$ flll rdto wee'rssumed,
At thlE tlme, Itflll mansgpment took a mof6 eggreselve apprqaoh to lovrerlng the Cell 1 Eolutlon lsve!. Cell 1 waa
pumped at rfisxlmum sanefer pump rete lntq Qell 4A, beglnnlng appoxlrnaFly August 8, At the tlme pf thls
wrltln$ Gell tl'o aoltltlofl levd has heen rcduced to 6610,9,l fedt amsl and the Mlll opnunuea h pump and
monftor tho rouovry ldvel ln the LDS.
The MIII elBo conunu8Blp eetlmeto the flow rqts hfq the LD$ bptweon pumphg, shoa the AuguetS detieotlonr
the fldt'v rete lrtto Uro LES haa nst Exceeded 1, gprfl,and. hae rengod frorn 0.01 b 0,02 gph, or approxltnately
oRO tenth to one tuantFth of the r6tB durlng the Juns det6c0on,
[furlng ptpne d]gouseishb wlth UPEO Farsonnelon Auguet 12, 2010, UDEQ agreed wlth Denleon that both the
Juns and Auguet ldsntlf,oatlone sf LD$ soluthne were all part of one eveht, At thlE tlrns, DenEon haE
corpluded thah
r Ths lnqpeotlon ahd repEks performed on th€ Cdll FML ln June and July wsre sppgrently not
suaaoBsful ln ldsntlfylng all of the damsge lyhhh rbgdlrsd rcpah.
r The tsttporery oeeeqthn of flottr lnto he tDS uefwsen the June and August Cetl t Los fluld dotpdlona
may havo resulted frqm the lorcr{ng of the eolutlon levEl tp E point'below ilre remahlng tostr or
damEgp h the FML. F,lounver, flB tho poluflon level ln Cell 1 roee, lt rusohed hp deveHsn d.one sr
morq femdtilfl$ d0Jods ln he llrrer,. Addltlongl Byfrtsmafic lnoprotlon qnd npah of the FML wlll
ttrrorul,o' be narirrli'ed :
Phn
Denlbon propos€s th6follpwirry plan dac'tlon tsr
r ldentlff f,hd eonflrm tne mot ueuqa of ttp obsorv,od Eoluilons ln the Gell il LDS,r Lao€fd'the epoolflc gr€aq of thg FML rgqulrlng repeln,r Goodt{g,t H Ey,StcmAtF snd,oruody rsHHlr Brooeds, hat d@E not qfierfltg further darnegs to thu FMLI oorlilrffi u16t tlta I'Fpe[q hHyts rftdunud,ot ellrnlneted the fl6w mto thd LDs. DooUment thp flhdln&, root:cgt{Bcr,and Gupmse aotlqne.
Thls plEn provldee a phHsed appluach to H6ntlfloetlOn and fapalr of the deJe0t6 in the Cplf I llner. lt lg hf,eed on
the n€sd for a etepwlee achedrrle to syutemafimlly unoovpr and lnepeet all potentlally dama@ arsao,
baglnnlng wlth those aress wlth the hlgheat potrenUalfor weer and reoulting damage, and to pErfurrn he repalre
tvlthotJt lnourrin0 further darnage b th6 FMt durhg the rarnwal of the pfotaotlve aoll oovsr. Denlson doer r-rot
want to dhHrb sny mor6 of the edl aover, and expoue.motB of the FML to thg envlronment, fian la necessary
ln order to mlnlmlze the rlelt 0f furthor daEgB ta 0!e FML, ln addltlon, tlxg toostlon of the rspalrs neqr the
tslllngs solutlon wlll rcqulra cpeCIlal affity precatrtione whloi add ts tho tlmo rcqulrpd for repalrs. Furthmi the
ablllty to perforrn ahy ropalrE durlng tho wlnter monthd wll be limlted due to enor ooverage and sllppery
condltlons, The kBy etepa ln he lhspeotlon arrd repalr prooess will he ae lollowe,
,,Htf,ffJDl/
Lsuor h Rusty l-rnope0 Cdl 1 Repelr Ptan
August 18, ?0:10
Page 5
Phare I Plan and Soheduts
Reduce tho Cell 'l aolutlon levolapproxlmetely to tho lavel lt reaohed durlng the June repaka. EduthnE
from Cell 1 alu ourrently bohg pumped ftom Csll 1 to olth€{ C6ll 3 or Cell4A. Tho aoluthn lEwlshould
be donn to fie June elevatlon by approxlrnetely August 3lx,
Iderilry areaa ln Cell 1 wlth hlghent potontlal for damage (lvfmro plpes enter and ofi he oell, gtc,), The
moot obvlous Eeotlons ang ln the aoutheagt oorrpr d Cetl 1 and ln the aouth cont al arpA 0f Fell I w,tere
tha ptrmp barge le Igoated. Theae srgas are eoilmated tro be appmxlmately 200 feet of the Oell I bank,
$yatamatlcelly lnspegt and repair the FML 6reee wi0r the hlghegt lll<ellhood 0f damage flrst, The 200
feet d he hlgheet rlak areee wlll bo unoovered arrd repa[d aE ng@srary. lt lE ostlmatod fiat thgte
repalrs wllltske appnoxlmately 10 weke, untllOc'toher 01, 2010.
Allq{,v the lsvel ln hE oell to rpoovar and cqnfirm that aoluHsns do not reappeer ln the LD$. Solutlon
fnom the Mlll prooeaa or front C6ll 0 or Cell 4A wtll be pumped tnto tha odl end ths LDB aurnp wlll be
monltored, lt lE estlrnstgd that thle etep w{ll take apFoxlmatdly 4 w6eka, untll Nsvember 00, ?010.
lf, afier the pr0qoBe ln et$ps 1 thtpUgh 4 hag heon comil€tod, solutlong resppeer ln the LD$, the
solution level ln Cell 1 wlll agaln ba rcduoed ln ordor to sohl€vE drynorg ln tha LQS. lt le expeded tlmt
It wllt take Bome tlthe ftr tho Oell 1 pofld solutlon b hF rsdused to the level rieoeeoary to H$leva
dryneer ln thg [Hs, Hnd &I lhe LP$ to bs vurfld to bsdry. Hawwff, thfu ptrsddure le erpsnub to Fe
eaoDmp[thed, by Dqoemherr$'i,,80t0.
A@ Ute solutlon level in Cdl 1 lE lowared, the next hlghestarca of oonoein (likelleat arqa for damage)
wlll he uhmvered, inapeot?d, qnd rapdl'cd. Follevrtng the roFf,ln, thp Gsll 1 aolutlon lgtrof sdl bH
dllfirl,od to gradudlly ttcev6r, ThE qcheduls hr oortrplAtion of ilrls gt$p wltl dapend 0n ilnkr @ndluurF
7, f, qlior the prooees ln $tspd S and 6 haa bepn oqmplEtd, rclullqn8 reqppeor ln the Ld8, tho eo,lutlon
fpvel ln Cell 1 wlll qgaln bB reduoed ln ortlar to aohisve drypaea ln the L[IS. The ofile d Etops 1 and 2
wll! be rgpgstodi ag nsogssary, untll all ttre nBaes8gry rEp€H hsv,g b66n msde to acnFve drynes8 tn
h€ LDg, The Eohedule of euheequent cydee of eteps 6 and 6 wlll he develqpod wlth the qonguruflco
of tho Exgcutive SeoretAry.
Reporilng
The Llner Malntensnoa PnrvlslonE appendlx of the Mlll'a DMT Plan desorlhea th6 typos of flspalrs that wlll he
lmplemented lbllowlng ldentlflcatlon of solutlorle ln the LDS, as r*ell aa requlremente for a repaF report
deeolb{ngthe nsture of ths damage and.the repalra. As requlred by ttre Llner Maintenance Prwlslons, a repalr
rdpurt wl!! b0 eubmltted to the ExecutlVe Seoretary fdlowlng lSvn'plstbfl of repatrs to the cell 1 ltner. The rupalr
repoft wlll oontaln, ln addlthn to a root cauoe analysls, he f0lloi,lng elemenB:
1.
4.
6,
PhrtellPhn and Bchedule
and udll be developed wlth th6 opnoulrsios of the Exogrtitq Sesnetary,
Repolr nanstMe descrlhlng the nature of the damage and the repalr work oompleted to repair the
damage,
Repalr matErlaltype ueed to complete the repalr
t
a
,,$iffiiHDll
Letter to Rusty LundbsrgOetf 1 Ropair Plan
August 18,2010
Pago 6
o Repair material dosorlptlonr Pogt repairs test speoificatlonsr Test Methods (ASTM or othor)r Daily reports during tho ropalr worko Repair test resultsr QualltyAssurancolQualityOontrol lnformation
Data colloctod durlng tho dlagnostlc steps, including solution accumulation rate erstimatlons and analytical
rosults from charaoterizatlon of LD$ solutlon samplos wlll also bo inclucled in the ropair report.
Fleaso contaot the undersigned if you havo any quostlons cr require any further information,
Yours very truly,
DeNrcor,r MrNE$ (USA) GoRP,
0a6l^^ -"-{-o.*-frir-*-//" Jo Ann Tischler
Director, Compliance and Permitting
cc: Rich E. Bartlett
David C, Frydenlund
Ron F. Hochstsin
Ryan Palrner
Harold R, Roberts
David E, Turk
psNr$or$lddd
MINES
Tab E
Calculation of Maximum Daily Allowable LDS Flow Volurue for Varytug Hond Condittone ln
Celts 4A and4B
Tho oquation for thp calpulation of mailimum daily allowahlo flow volump in Celle 4A, and 48 is
ae follows;
Step l)
Wherc:
Stop 2)
Steps)
$tep 4)
Elevation l-Elevetion 2 = Head (ft.)
Blovetion I is the maximunr eleyEtion in feet nressrffod during the reporting
psriod.
Elevuion 2 is tho FML elevation in fect.
Detcrmine CaloulatedAction lrakage Rars from Table lA (for Cell4A) or Tablp
18 (for qeII 4B) using tlte hend calpulated in $tnp I abovp, ffthe trpad onloulntcd
in stnp t ahqvg ftIls hetweps two v&luw tq fUs llsad Atovs Ltuor $y,rtour (feet)
cplwm[, thenthBddgqr of thFqe twq vqh+c*wCllte,uned'te dufertnire'thu '
Caloulntnd Aetioil l*ukqEe H*te;
Calculste the $p{E$ of Eflfnge ceJl flutOs h'$eU m thp qron ofthq bass,uf rhq s6lli
Aption I*alrrage Rafe (ftom Table 1A or 1B) X Aarcs of Tailhrge Cell Fluids =
MEEimt'n Daily Allstiyable Flow V(4qir.rfi
Max head on Cell4A FML
[trlaxlmum Head on Cell 4A FML was not calculated durirtg second quarter 2011. A
letter from the Executive Secretary dated January 27,201,t which approved the use
of Cell 48, and a subsequent letter dated March L5,?;oLL, stated approval of the
OMT and Cell +a operatlons and Malntenance ('O&M") Plans effectiveV ellmlnated
the former freeboard elevation requirements for tailings Cell4A, Pursuant to the
recelpt of the March 15, 2011 letter, freeboard llmits in Cell 4A were no longer
requlred. Denisorr corporete staff rnisintErpreted this waiver as meaning that the
weekly elevations no longer needed to be conducted. As a result, these
mea$urements were not collected during the perlod.
Max heid on Cell48 FML
Mex elvation (ft,}
FML elevatlon (ft.)
Head (ft,1
From BAT O&M Table 18
Assume acres of fluid based on maximum level(acres)
Max allowable flow rate (gal/day)
48 - q2 ?011
5s8X.59
5557.5
24.09
475,6
33
15694.8