ML21239A073
| ML21239A073 | |
| Person / Time | |
|---|---|
| Site: | 07000925 |
| Issue date: | 08/31/2007 |
| From: | Lux J Cimarron Corp |
| To: | Kenneth Kalman Document Control Desk, Office of Nuclear Material Safety and Safeguards |
| References | |
| Download: ML21239A073 (30) | |
Text
CIMARRON CORPORATION P.O.BOX316e CRESCENT, OK73028 August 31, 2007 Mr.Kenneth Kalman Office ofNuclear Materials Safety & Safeguards U.S.
Nuclear Regulatory Commission Washington, D.C.20555 Re: Docket No.70-925; License No.
SNM-928 Closure onSeveral Issues
DearMr.Kalman:
Cimarron Corporation (Cimarron) submits this request toobtain closure onseveral items associated with groundwater remediation and monitoring which areNOTrelated toongoing groundwater decommissioning Obtaining closure on these items will enable NRCandTronox todemonstrate that several aspects ofthe decommissioning project havebeencompleted, and Tronox will then beable tofocus its resources onthe final remaining aspect ofdecommissioning.
Noneoftheissues addressed herein arerelated tothe decommissioning ofuranium-impacted groundwater regarding which Cimarron isengaged intechnical discussions with NRC.
D a
License Condition 27(b) stipulates 6.7Bq/1(180 pCi/l) total uranium as the groundwater release criterion foruranium attheCimarron site.
Italso specifies the followingmeans ofdemonstrating compliance with this limit:
".NRCwill notterminate Radioactive Materials License SNM-928 until Cimarron demonstrates that thetotal uranium concentrations inallwells havebeen belowthe groundwater release criteria for eight consecutive quarterly samples (the past2years). "
Since this license condition wasissued, Cimarron hasinstalled numerous groundwater monitoring wells toidentify areas ofgroundwater impact andtocharacterize the hydrogeology andgeochemistry ofimpacted areasItisourunderstanding that itwasnever NRC'sintent that Cimarron sample every well onthesite foreight consecutive quarters todemonstrate compliance with therelease criterion.
- Rather, NRCintended that eachwell used todemonstrate compliance mustyield groundwater below thelimit
- i.e.,
Cimarron will notemploy "averaging" for groundwater IntheWell1319Area(the areaoccupied bytheformer uranium facility),
Cimarron has demonstrated that total uranium concentrations arewellbelow thegroundwater release criterion for morethan eight consecutive quarters.
Cimarron requests that NRCprovide closure inthis areabyreleasing Cimarron fromfurther monitoring inthis areaandapproving theabandomnent ofmonitoring wells intheplant area.
Cimarron Corporation Page1of2 August 2007
Assessment ofGroundwaterforTc-99 Ina letter datedMarch13,1997, NRCestablished acriterion of3,790 pCi/1 forTechnetium 99in groundwater.
Cimarron conducted extensive groundwater assessment andmonitoring, andhas demonstrated thatgroundwater isbelow this
- limit, satisfying the"eight quarters" criterion stated inLicenseCondition 27(b),
asdiscussed above.
Consequently, Cimarron requests that NRC provide closure by releasing Cimarron fromcontinued monitoring forTc-99 andapproving the abandonment ofmonitoring wells installed forthe assessment ofTc-99 ingroundwater.
EW Theexisting environmental monitoring
- program, Section 15of (RPP),
isneither necessary for assessment
- purposes, norisitappropriate forgroundwater decommissioning.
This program, in which numerouswells aresampled onanannual
- basis, requires theexpenditure ofeffortand expense with nobenefit toeither Cimarron orNRC.
Cimarron believes itisauthorized toeliminate the environmental monitoring program in accordance withlicense Condition 27(e). However, NRChasexpressed concern that monitoring mustcontinue inareas requiring remediation.
Consequently, Cimarron requests NRCapprovalto remove fromtheenvironmental monitoring program onlythose sampling locations notassociated with areasstill requiring remediation.
Sampling inareas requiring remediation will continuein accordance with theenvironmental monitoring program until anNRC-approved amendmentto the sitedecommissioning plan replaces theenvironmental monitoring program with adecommissioning (and post-decommissioning) monitoring program forthese areas.
WellAbandonment Overthepastthree
- decades, Cimarron hasinstalled manygroundwatermonitoring wells atthe Cimarron site fornumerous purposes.
Site-wide groundwater assessment has identified several areas which mayhaveinthepastexceeded groundwater release
- criteria, andthree areas which still require remediation.
Numerous wells areinstalled inareas inwhich there has never been anyevidence ofgroundwater impact.
Cimarron requests NRCapproval toabandonwells not associated with areas still requiring remediation.
Attachment 1tothis letter provides amorethorough description oftheworkperformed, presents supporting
- data, andlists specifically themonitoring wells described above.
Ifyouhaveany questions regarding this license amendment
- request, please call meat405-775-5194 (OKC) or 405-642-5152 (mobile).
Sincerely, 6
Jeff Lux Project Manager Cc: Blair Spitzberg, NRCRegion IV David
ATTACHMENT 1
INFORMATIONSUPPORTING CLOSURE ONFOURGROUNDWATER MONITORING ISSUES
TABLEOFCONTENTS 1.0 Executive Summary
,=......3 2.0 Facility Operating History.......................,............................................4 2.1 License Number/Status
.............................................................................4 2.2 LicenseHistory
,.............,......,......,,.....................,,.4 2.3 Previous Decommissioning Activities......................................5 2.4 Spills........................................................,................................................6 2.5 Prior On-Site Burials...................,...................................6 3.0 Facility Description........................................................8 4.0 Radiological Status ofFacility
...................................................................9 4.1 Structures, Equipment,Soil, andSurfaceWater
......................,........9 4.2 Ground Water...,...................................................9 5.0 Environmental Monitoring for Groundwater....................................................11 5.1.1Well1319 Area................................,..................................,...........11 5.1.2Uranium Pond#1Area...........=.=..........,
.................12 5.1.3Uranium Pond#2Area................................................,..................13 5.1.4Monitoring Wells inOther Areas...........,........,.................................13 5.1.5Surface Water Sampling Locations............,...............14
LISTOFTABLES Table1.1 Subarea Status Table 5.1 Wells 1319B-1 and1319C-1 Total Uranium Data Table 5.2 Uranium Pond #1and#2AreaTechnitium-99 Data LISTOFFIGURES Figure 1.1
- Cimarron Site Subareas Figure 4.1
- Groundwater PlumeAreas Figure 5.1
- Graph ofWell1319B-1 UraniumData Figure 5.2
- Graph ofWell1319C-1 Uranium Data Figure 5.3-Well1312Tc-99Data Figure 5.4
- Seep1208Tc-99 Data Figure 5.5
- Well1336ATc-99Data i
1.0 Executive Summary Cimarron Corporation (Cimarron) ownsa former nuclear fuelproduction facility near Crescent,Oklahoma.
The Cimarron sitewas closed in1975,andisbeing decommissioned in accordance withanNRC-approved decommissioning planunder License SNM-928.
The license nowaddresses thedecommissioning ofthefacility, whichiscomplete forall environmental mediaexcept groundwater.
Cimarron plans to decommission thesite forrelease for unrestricted use.NRCestablished release criteria of180pCi/I fortotal uranium and 3,790 pCi/I forTc-99ingroundwater.
License Condition 27(b) established aprotocol fordemonstrating compliance withthose criteria.
Thissubmittal demonstrates, inaccordance withLicense Condition 27(b),
that groundwater inthree areas which atonetime exceeded groundwater release criteria no longer exceed those criteria.
2.0 FacilityOperating History 2.1 License Number/Status TheCimarronfacility wasoperatedasanuclear fuel production facility underLicense SNM-928until itwas closed in1975.Facility decommissioning beganin1976; decommissioning continues inaccordance withadecommissioning planapproved by NRCinAugust 1999.
The site isoneoftheformer Site Decommissioning Management Program(SDMP) sites referenced in10CFR70.38a(3)iii.
Thedecommissioning and final status survey ofbuildings and soils iscomplete. Groundwater exceeds license criteria inthreeareas.Groundwater inthreeotherareasformerly exceeded groundwater release criteria.
Duetoeither natural attenuation ortheactive removal of impacted groundwater, groundwater inthesethree areas hasbeenremediated.
2.2 License History Thelicensing history ofthesite, fromissuance throughApril 1995, ispresented in Section 1ofW (Chase EnvironmentalGroup, April1995).
The SDPwassupplemented by Repod(GER,ChaseEnvironmental Group,1998).
NRCapproved the SDP onAugust 23,1999.
TheSDPandGERpresented information indicating that natural attenuation mayreduce theconcentration oflicensed material ingroundwater sufficiently thatactive groundwater remediation maynotbeneeded.
TheGERstated
- that, should information indicate thatnatural attenuation maynotachieve
- this, additional assessment and/or remediation maybeneeded.
Additional assessment hasbeenperformed andtheSDP will beamendedtoprovide formoreactive remediation inthethree areas inwhich groundwater continues toexceed license criteria.
Fabricatjon Facility (Chase Environmental Group,1994) divided theCimarron site into Subareas Athrough O(Figure 1.1).
TheseSubareas weregrouped into three "Phases"
Phase ISubareas (Athrough E)weresurveyed asunimpacted areas.
Thefinal status survey plan forPhaseISubareas wasapproved byNRCinMay1995.PhaseII Subareas (F through J)andPhaseIllSubareas (Kthrough O)weresurveyed as impacted areas.
Finalstatus survey plans forPhaseIIandPhaseIII Subareas were approved inMarch 1997 andSeptember1998,respectively.
Cimarron submitted Final Status Survey reports foreachsubarea ofthesite from1996 to2005.Table1.1, taken from W (Nextep Environmental, Inc.,
2005) provides alistingofthedates offinal status survey plans and
- reports, status ofconfirmatorysurveys, andthedatesofrelease forthefifteen Subareas.
NRCreleased allbutthree subareas inLicense Conditions 25and28 through 30.Remaining unreleased subareas willnotbereleased until groundwater remediation iscomplete.
A license amendmentrequest(LAR) containing an amendment totheSite Decommissioning Planwassubmitted in2006.TheLAR was intended toprovide for thedecommissioning ofareasexceeding release criteria and closure forareas already remediated.
NRCnoted deficiencies inthegroundwater remediation proposal; these will beaddressed ina subsequent LAR.However, NRCdidnot respond tothose portions oftheLARthat wouldprovide closure forareas which already comply with decommissioning criteria.
Consequently, this document isbeing submitted separately fromtheDecommissioning Plan amendment tosecure closure forthose areasfor which decommissioning iscomplete.
2.3 Previous Decommissioning Activities Previous decommissioning activities include thedecontamination andremoval/disposal ofallequipment usedintheprocessing offeedmaterial andtheproduction ofuranium
- fuel, aswell asthedecontamination oftheprocess buildings.
A portion oftheuranium building hasbeendismantled andremoved fromthesite.
Allremaining buildings were released forunrestricted useinLicense Conditions 29and30.
Soil yielding greater thanthe30pCi/g total uranium criterion specified inLicense Condition 27(c) wasexcavated.
Soil exceeding 100pCi/g total uranium waspackaged andshipped toalicenseddisposal facility.
Soil yielding between 30and100pCi/g total uranium was buried inanonsite disposal cell inaccordance withLicense Condition 27(a).
Decommissioning ofsoils iscomplete attheCimarron site.
Final status survey reports weresubmitted forallareasofthesite between 1996and2005.Three subareas havenotyetbeen released forunrestricted use:Subareas F,G,andN.The remaining subareas were released for unrestricted useinLicense Conditions 25,28,29, and30.
Groundwater whichexceeds orrecently exceeded NRC-stipulated criteria wasidentified insixareas.
inthree
- areas, natural attenuation orextraction reduced theconcentration ofradionuclides toless than theNRC-stipulated criteria.
2.4 Spills During operating
- years, a pipeline carried wastewater from lagoons totheCimarron River.
During decommissioning activities, itwasdiscovered that thepipelinehad historically leaked into alluvial materials nearthebluff overlookingthe Cimarron River.
Thepipeline wasremoved, andsoil exceeding thecriteria specified inLicense Condition 17(c) wasremovedfordisposal.
Thetrench was thenbackfilled.
Site-Wide Groundwater Assessment Review (Kerr-McGee, 2005) identifies this areaasan area in whichgroundwater remediation isrequired.
Groundwater exceeding thetotal uranium criterion of180pCi/I hasbeendelineated, andthehydrogeology andgeochemistryof theareawasreported inCW (ENSR,2006).
Theamendment totheSDPwill address theremediation ofgroundwater inthis area.
2.5 Prior OnSite Burials Licensed material wasburied intrenches inthree
- areas, historically referred toasBurial Grounds
- 1,#2,and#3.Allmaterial exceeding criteria forsoils specified inLicense Condition 27(c) wereremoved fromthetrenches during previous decommissioning activities.
Groundwater impacted bylicensed material atconcentrations exceeding the
release criteria specified inLicense Condition 27(b) hasbeenidentified downgradient fromtwo oftheseareas:
Burial Ground
- 1andBurial Ground
- 3.
Site-WideGroundwater AssessmentReview (Kerr-McGee, 2005) identified theareas in which groundwater remediation isrequired.
Groundwater exceeding thetotal uranium criterion of180pCi/I has beendelineated,andthehydrogeology andgeochemistry of theareas werereported in W (ENSR,2006).
3.0 Facility Description The Cimarron siteislocated nearCrescent, Oklahoma.Detailed information concerningthe facility,
- climate, land use,andradiological characterization ofthesite are presented inthe SDP andtheGER, Detailed information onthegeology andsurface andground waterhydrology arepresented inW (ENSR, 2006).
4.0 Radiological Status ofFacility 4.1 Structures, Equipment,
- Soil, andSurface Water Cimarron hascompleted thedecommissioning ofallstructures, equipment, andsoils.
NRChasperformed confirmatory surveys forallareas except Subarea F.AllSubareas except Subareas F,G,and Nhavebeenreleased forunrestricted use.
4.2 Ground Water TheCimarron facility isunderlain bysandstone bedrock inthesouthern two-thirds ofthe site oralluvium inthenorthern third.The Cimarron River floodplain contains alluvial
- material, andrepresents themostpermeable water-bearing zoneonsiteUpland areas areunderlain bythree sandstones ofrelatively low permeability, which arereferred toas Sandstones A,B,andC,fromhigher tolower elevation.
These three sandstone layers areseparated bylow-permeability mudstones, whichfunction asaquitards,severely limiting groundwater flowbetween permeable zones.
The hydrogeology ofthesiteis described indetail inW (ENSR, 2006).
NRChasestablished release criteria of180pCi/I fortotal uraniumand 3,790 pCi/1 for Technitium-99 ingroundwater.
Cimarron identified allpotential sources of groundwater contamination andinstalled groundwater monitoring wells asneeded todetermine if licensed material had migrated fromanyofthesepotential
- sources, causing groundwater toexceedthecriteria.
Inaddition, historical groundwater data was reviewed toidentify areas which mayhaveexceeded thecriteria inthepast.
Site-Wide Groundwater Assessment Review(Cimarron, 2005) describes this groundwater assessment anddivides thesite intofourcategories ofareas,termed "Phases" PhaseIareas arehydrologically isolated fromformer production ordisposal activities; groundwater intheseareasisunimpacted.
PhaseIIareas arepotentially impacted areasinwhichgroundwater monitoring hasdemonstrated impact isbelow release criteria.
PhaseIll areasareareas whichhavebeenimpacted aboverelease
- criteria, butforwhichgroundwater monitoring indicates impact no longer exceeds
release criteria.
Phaselila areasareareasforwhichmonitoring demonstrating compliance waslongagoobtained andisnolonger needed.
Phaselilb areas areareas for which needed monitoring dataispresented inSection 5ofthis document.
PhaseIV areas are areas inwhichgroundwater monitoring indicates impact still exceeds release criteria.
PhaseIV areas requiregroundwaterremediation, andarenotaddressed inthis license amendmentrequest.
S (Cimarron, 2005) identified sixareasin whichgroundwater hasatsome time exceeded license criteria.
Threeoftheseareas wereidentified asPhaseIIIb areas, and threewereidentified asPhaseIVareas.
Figure 4.1showshowthesite hasbeendivided into thefour "phase" categories, aswell asthe location ofthethree areas addressed inthis license amendment request.
Tc-99 atonetimeexceeded the3,790pCill criterion ingroundwater intwoareas:
theU-Pond#1andU-Pond#2areas.Section 5,Environmental Monitoring andControl, describes themonitoring completed inthese
- areas, demonstrates that groundwaterno longer exceeds applicable
- criteria, andproposes that monitoring beterminated forthese areas.
IntheWell1319area,uranium exceeded the180pCill release criterion ingroundwater inSandstones B andC. Cimarron extracted groundwater exceeding the release criterion, pumping theimpacted groundwater fromWells1319B-1 and1319C-1 Section 5,Environmental Monitoring andControl, describes themonitoring completed in this area,demonstrates that groundwater nolonger exceeds applicable
- criteria, and proposes that monitoring beterminated forthis area.
5.0 Environmental Monitoring forGroundwater Asstated inSection 4.2,groundwater inthree areas formerly exceeded release
- criteria, butdonotexceed releasecriteria anymore.Groundwater assessment datahadnot beencollected long enough prior tothesubmission ofSite-Wide Groundwater Assessment Review (Cimarron, 2005) toenable Cimarron todemonstrate compliance withrelease criteria.
Those areas are:
- Well1319Area
- Uranium Pond#1Area
- Uranium Pond#2Area Thissection presents groundwater datacollected todemonstrate compliance with release criteria (in accordance withIlcense condition 27(b)) foreachofthesethree
- areas, andidentifies monitoring wells which will beabandoned, astheyarenolonger needed.
Italsoaddresses theabandonment ofother wellsin areas notassociatedwith areas requiring remediation orcontinued monitoring.
5.1.1 Well1319Area Groundwater exceeded release criteria foruranium inSandstone BandSandstone Cin a smallareasurrounding former Well1319.Groundwater exceeding release criteria wasremovedbypumping.
After thepumpswereshutdown,Cimarron initiated quarterly sampling ofmonitor wells1319B-1 and1319C-1, theonlytwowells that yielded groundwater exceeding release criteria.
Table5.1presents dataobtained from thesewells.
Figures 5.1and5.2provide graphs ofthedataforeachwell, indicating whendatawascollected forassessment, remediation, andpost-remediation monitoring.
Decommissioning ofbuildings andsoil inSubarea K,thesubarea impacted bylicensed material ingroundwater around Well1319,hasbeencompleted.
Cimarron believes this datademonstrates that theonlymediaforwhichdecommissioning wasstill
- required, groundwater, iscomplete.
Inaddition, asstated inSite-Wide Groundwater Assessment
Review (Cimarron, 2005),
there isnoneedforfurther groundwater assessment inanyof theSubareas formerlyoccupied bylicensed operations, whichinclude Subareas I,K,L, andthesouthern portionofSubarea N.
UponDEQand NRC
- approval, Cimarron will plugandabandon groundwater monitoring wells located inthe Well 1319Area,aswellasother wells located intheabove-mentioned Subareas.Cimarron proposes toabandon thefollowing monitor wells:
1319A-1 1319B-1 1319C-1 1322 1323 1319A-2 1319B-2 1319C-2 1326 1327B 1319A-3 1319B-3 1319C-3 1328 1329 1319B-4 1319B-5 1330 Inaddition, several monitor wells wereinstalled inareas incloseproximity toformer lagoons during site widegroundwater assessment activities, from whichnofurther data isneeded.
UponDEQandNRCapproval, Cimarron will plugand abandon thefollowing monitor wells inthese areas:
1331 1332 1333 1334 1348 1349 1353 5.1.2 Uranium Pond#1Area Groundwater exceeded release criteria forTc-99 inonewell located downgradient from Uranium Pond#1
- Well1312.Thisistheonly wellinthis areathathaseveryielded Tc-99above therelease criterion.
Table 5.2presents Tc-99 data forWell1312.Figure 5.3provides agraph ofthese data.
Active remediation wasneverrequired forthis area; natural attenuation reduced theTc-99concentration inthis area toless thantherelease criterion.
UponDEQandNRC
- approval, Cimarron will discontinue monitoring inthis areaandwill plugandabandon thefollowing groundwater monitoring wells located intheUranium Pond#1area:
1311 1312 1313 1340 1341 1345 1354 1355 5.1.3 UraniumPond#2Area Groundwater hasexceeded releasecriteria forTc-99atonelocation downgradient from Uranium Pond#2 labeled Seep 1208.Thisistheonlylocation inthis areathat has recently yielded Tc-99 above the release criterion.
Thehighest concentrations ofTc-99 ingroundwater inthis area were obtained fromWell1336A.
Table 5.2presents Tc-99 dataforthese twolocations.
Figures 5.4 and5.5provide graphs ofthese data.
Active remediation wasnever required for this area; natural attenuation reduced theTc-99concentration inthis areatolessthan the release criterion.UponDEQandNRC
- approval, Cimarron will discontinue monitoringin this areaandwill plugandabandon thefollowing groundwater monitoring wells locatedin the Uranium Pond#2area:
1336A 1337 1338 1346 1347 5.1.4 Monitoring Wells inOther Areas Numerous monitoring wells wereinstalled intheCimarron River floodplain toevaluate potential releases fromUranium Ponds#1and#2.Thesewells arenolonger needed.
UponDEQandNRCapproval, Cimarron will plugandabandon thefollowing monitor wells:
1320 1321 1324 1325 1335A 1339 1342 1343 1344 T-51 T-52 T-53 T-54 T-55 T-56 T-57 T-58 T-59 T-60 T-61 T-63 T-69 T-80
5.1.5 Surface Water Sampling Locations Surface water samples werecollected fromthefollowing locations aspartofthe environmental monitoring program.
UponDEQandNRCapproval, Cimarron will eliminate theenvironmental monitoring program anddiscontinue sampling ofthe following locations:
1201 1202 1204 1205 1206 1208 1209
TABLES
TABLE1.1 CIMARRON CORPORATIONCIMARRON FACILITY SUBAREASTATUS A
- E 690Released 1996 F
20FSSR 2005 ResonsetoNRCComments 2006 NRCConfirmatoSurve None Released G
20 FSSR 1999 Res onsetoNRCComments 2000 NRC Confirmato Surve 2001 Released H
40Released 2001 I
20Released 2001 J
7 Released 2000 K
5Released 2002 L
5 Released 2001 M
3Released 2001 N
12FSSR 2002 NRCComments None NRCConfirmato Surve 2002 Released O
7 Released 2000 Page1of1
TABLE5.1 CIMARRON CORPORATION WELLS1319B1AND1319C-1 TOTALURANIUMDATA 1319B1 1319C-1 at al Sample Date Uranium Uranium (pCill)(pCi/I)
Jun-03 200.5 232.2 Se -03 195.3 308.5 Dec-03 146.6 105.6 Dec-03 179.5 98.9 Mar-04 177.4 75.1 Mar-04 179.2 39.4 Ma-04 132.6 51.1 Jun-04 136.6 30.1 Au -04 132.7 29.2 Feb-05 99.6 19.4 Jun-05 109.3 19.7 Se -05 102.5 18.1 Dec-05 84.7 18.9 Feb-06 90.8 20.6 Ma-06 86.7 14.97 Se -06 64.5 15.5 Page1of1
TABLE5.2 CIMARRONCORPORATION URANIUMPOND#1AND#2AREATECHNITlUM99 DATA Well1312Seep1208Well1336A SWe c-M R-M Date (pCill) (pCill) (pCi/I)
Ma -96 4550 Au -96 1700 Oct-96 856 Mar-97 3680 3960 2590 Jun-97 1470 2800 1930 Se-97 2190 3040 1880 Dec-97 1570 2080 1200 Mar-98 1850 2300 1600 Ma-98 1820 1930 Jun-98 1850 Se -98 2110 2640 1510 Dec-98 1650 1820 1260 Mar-99 1450 2370 1160 Jun-99 569 1200 974 Se-99 919 3140 713 Nov-99 3470 1160 Dec-99 1410 Mar-00 1350 4350 1070 Jun-00 930 12.2 Au -00 547 Se -00 1100 Se -00 4030 939 Dec-00 1120 890 Mar-01 957 3560 946 Jun-01 747 3300 875 Dec-01 744 600 Dec-01 2490 Jun-02 826 3230 Jun-02 1060 Se -02 1030 898 Se-02 4050 Dec-02 1030 3990 1020 Feb-03 1260 4280 Jun-03 2060 5300 952 Se -03 2320 2810 873 Page1of2
TABLE5.2 CIMARRON CORPORATION URANIUMPOND#1AND#2AREATECHNITlUM99 DATA Well1312Seep1208Well1336A Sample Tc99 Tc99 Tc99 Date (pCi/I) (pCi/I) (pCi/I)
Dec-03 4300 3220 Mar-04 4590 3400 Ma-04 910 Ma-04 3140 Au -04 607
. 3320 949 Dec-04 943 Feb-05 718 655 Ma-05 801 2810 839 Ma-05 755 Se-05 1050 857 Dec-05 1150 614 Feb-06 915 635 Ma-06 851 2980 577 Sep-06 1150 2910 594 I
Page2of2
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