Text

Sweetwater Uranium Project, Response to Comments: License Renewal Request, License Amendment for the Proposed Change to the Groundwater Corrective Action Program, Environmental Monitoring Program and Reclamation Plan
	ML042110348
Person / Time
Site:	04008584
Issue date:	07/22/2004
From:	Paulson O A; Kennecott Energy Co
To:	Janosko G S; NRC/NMSS/FCSS
References
	-RFPFR
	Download: ML042110348 (80)
	v • d • e

Kennecott Uranium Company Sweetwater Uranium Project-A' ~enneco tt Post Office Box 1500~FRawlins, Wyoming 82301-1500 wEnergy Phone: (307) 328-1476 Fax: (307) 324-4925 22 July 2004 Mr. Gary Janosko, Chief Fuel Cycle Facilities Branch Division of Fuel Cycle Safety and Safeguards Office of Nuclear Material Safety and Safeguards Mail Stop T-8A33 11545 Rockville Pike Rockville, Maryland 20852-2738

Dear Mr. Janosko:

Subject:

Sweetwater Uranium Project -Docket Number 40-8584 Source Material License #SUA-1350

-Response to Comments:* License Renewal Request* License Amendment for the Proposed Change to the Groundwater Corrective Action Program, Environmental Monitoring Program and Reclamation Plan Enclosed please find the following:

1. Revised Appendix 4 of the Request for Renewal entitled -Sweetwater Uranium Project -2004 Surety Update for the Nuclear Regulatory Commission

-May 2004. This submittal is in response to a request dated June 24, 2004 made by Elaine Brummett of your staff. This surety document uses a long-term surveillance fee of $698,301.00, provided by Elaine Brummett of your staff in a telephone conversation on Wednesday, May 14, 2004. This fee is based on the May 2004 Consumer Price Index (CPI). Since this fee is based on the May 2004 CPI, it is requested that the anniversary month for surety calculation be May of each year.2. Response to Comments submitted in response to a request dated June 24, 2004 by Elaine Brummett of your staff, for additional information regarding the license amendment request for a proposed change to the groundwater Corrective Action Program (CAP), Environmental Monitoring Program and Reclamation Plan related to contaminated soils and groundwater discovered in the vicinity of the Sweetwater Uranium Project's Catchment Basin.3. Completed NRCForm 313 -ApplicationforMaterial License.This submittal has been discussed with Elaine Brummett of your staff. If you have any questions please do not hesitate to contact me.Sincrl ourr Oscar Paulson -ll jo Facility Supervisor cc: Elaine Brummett (2)2 Director -NRC DRSS Region IV (w/o enclosures)

Rich Atkinson Antelope Mine

Colowyo Mine

Cordero Rojo Mine

Jacobs Ranch Mine -Spring Creek Mine ,A Iml('IIblM'r of the Jil 7Tinto (;Grou fI, 1 Kennecott' Q r Energy Kennecott Uranium Company Sweetwater Uranium Project Docket No. 40-8584 SML #SUA-1350 REVISED APPENDIX 4 Request for Renewal -May 12, 2004 15 July 2004 SWEETWATER URANIUM PROJECT 2004 SURETY UPDATE FOR THE NUCLEAR REGULATORY COMMISSION JULY 2004 REVISION 2 Preparedfor:

KENNECOTT URANIUM P.O. Box 1500 Rawlins, Wyoming 82301 Prepared by: MFG, INC.3801 Automation Way, Suite 100 Fort Collins, Colorado 80525 (970) 223-9600 Fax: (970) 223-7171 MFG Project No. 181113 TABLE OF CONTENTS 1.0 2.0 3.0

4.0 INTRODUCTION

............................................................................................................................1 COST ESTIMATE ........................

2 2004 SURETY UPDATE COSTS ........................

4 REFERENCES

........................

5 LIST OF FIGURES Existing NRC Bonded Areas LIST OF TABLES Unit Cost Summary 2004 Surety Estimate Summary LIST OF APPENDICES Figure I Table I Table 2 Appendix A Cost Estimate Kennecoti Uranium Company 2004 Surety Update -updated 7-1-04 doc MFG, Inc.July 2004 i

1.0 INTRODUCTION

MFG, Inc., on behalf of Kennecott Uranium Company, has prepared a surety rebaselining for the Sweetwater Uranium Facility for the year 2004. A rebaselining of the surety using current costs is required by the Nuclear Regulatory Commission (NRC) every five (5) years. A rebaselining of the surety involves recalculation of the surety amount using current costs as opposed to merely increasing the surety based upon changes in the Consumer Price Index (CPI). Additional backup for the referenced source, quantities, and unit rates that comprise the estimate are present or referenced in the following pages.The attached sheets present the details of the cost estimates for mill decommissioning, existing impoundment reclamation, soil cleanup and verification, including backup and a description of assumptions.

These sheets have been prepared in accordance with NUREG-1620-Standard Review Plan for the Review of a Reclamation Plan for Mill Tailings Sites Under Title II of the Uranium Mill Tailings Radiation Control Act. Key unit prices used in the estimates are summarized on Table 1, and cost estimates are summarized on Table 2. The map showing the current area under the NRC bond is included as Figure 1.Kennecott Uranium Company 2004 Surety Update -updated 7-1-04 doc MFG, Inc.July 2004 I 2.0 COST ESTIMATE The mill and shop area decommissioning costs are based on quantities and information from previous reports, listed in the references (Landmark Engineering, 1990; Shepherd Miller 1997, 1999). Volumes and quantities for the site calculated for the April 20, 1999 surety update were used for this update.Various publicly available sources were used for estimating the costs in this surety update. Mill demolition rates were selected based on rates identified in RS Means (2003), and were calculated to be$0.50 per cubic foot of material.

Concrete demolition and disposal rates were identified from rates presented by Portle and Jakubowksi (2002). Materials retrieved from the dismantling of the mill will be placed inside the tailings impoundment.

It was assumed, for this estimate, that there will be no salvageable materials from the mill facility.Different unit rates for soil excavation and placement were used for the Update. Unit rates were selected based on cost estimates presented by the Wyoming Department of Environmental Quality (2003) and Portle and Jakubowski (2002). These cost estimates are presented below.Table 1 Unit Cost Summary Item Description 2004 Unit Cost Replace Topsoil " $1.25 per cubic yard Regrading/Ripping Soil a $350 per acre Remove/Excavate Soil a $1.60 per cubic yard Concrete Foundation Demolition b $2.50 per square foot Onsite Concrete Disposal b $6.00 per cubic yard aWyoming Department of Environmental Quality, 2003 bPortle and Jakubowvski, 2002 For situations in which use of nearby borrow areas for fill or nearby spoil areas for excess cut will be made, and in which limited engineering and construction quality assurance (CQA) is required (because moisture and compaction specifications do not apply), a unit of rate of $1.25 per cubic yard was used.For situations in which removal of soil will be performed with tight construction quality assurance and control, as will be the case with windblown and contaminated soils cleanup, a unit rate of $1.60 per cubic yard was used. Corrective Action Program (CAP) restoration costs were estimated based on MFG, Inc.consulting costs for the project.Radiological costs have been reduced since the 1999 surety update due to advances in technology.

For the 1999 surety update, the radiological survey was based on dividing the area into grids, surveying each grid location, staking the grids and walking each grid with a handheld Ludlum 2350 Gamma meter. Data from the grids was recorded manually and an analysis was completed using a spreadsheet.

Kennecoll Uranium Company MFG, Inc.2004 Surety Update -updated 7-1-04.doc 2 July 2004 Global Positioning System (GPS) based systems have considerably reduce the cost for this analysis.

The handheld GPS based system is attached directly to a Ludlum meter. Data from the system is then fed directly into a laptop PC from the meter. This system can be mounted on a truck, all terrain vehicle or in a backpack, greatly increasing the data gathering ability. This method of radiological survey analysis has also reduced the time it takes to complete a survey, thus reducing the costs further. Based on recent radiological surveys conducted by MFG, Inc., the costs of this survey were estimated to be $1,000 per acre (MFG, 2003).Engineering/CQA was considered either to have already occurred through preparation of the final design or is incorporated in the unit rates selected for this surety estimate.

Engineering/CQA was not included in cost estimating for the current bond and this convention was followed for the cost estimate presented herein. A 15 percent contingency factor for all construction items, as required by NRC, was included in the cost estimate presented herein.Kennecoll Uranium Company 2004 Surety Update -updated 7-1-04-doc MFG, Inc.July 2004 3 3.0 2004 SURETY UPDATE COSTS The estimated cost for demolition and placement of all materials in the tailings impoundment, decommissioning the mill, reclaiming the existing tailings impoundment, performing soils cleanup, performing CAP groundwater restoration and miscellaneous building removal is estimated to be$7,664,298 in 2004 dollars. The attached Appendix A provides the details and the backup materials for this estimate.

This cost estimate includes $698,301 for long-term surveillance fees. Rounding the value of the estimate up to the nearest $1,000, in keeping with existing practice, would result in a bond to cover these costs of $7,665,000.

Table 2 2004 Surety Estimate Summary Item Description 2004 Estimatedl___tem_ DescriptionCost Mill Decommissioning

$1,434,256 Soils Reclamation

$ 768,257 CAP Restoration

$1,141,953 Existing Impoundment Reclamation

$2,004,851 Radiological Survey Monitoring

$ 455,680 Long Term Surveillance Fees $ 698,301 Mobilization/Demobilization

$ 290,250 Contingency (15%/) $ 870,750 TOTAL $7,664,298 Kennecott Uranium Company 2004 Surety Update -updated 7-1.04.doc MFG, Inc.July 2004 4

4.0 REFERENCES

Landmark Reclamation, 1990. "Bonding Cost Estimate, Sweetwater Uranium Operations Tailings/Mill Area" September.

MFG, Inc., 2003. "Integrated Project Schedule for Closure of the Dawn Mining Company Millsite" Prepared for the Dawn Mining Company and presented to the Washington Department of Health.November 20.RSMeans, 2003. "Heavy Construction Cost Data 17'h Annual Edition." RSMeans Construction Publishers and Consultants.

Kingston, Massachusetts.

Portle, T. and Jakubowski, R., 2002. "A Guide to Preparing and Reviewing Financial Assurance for Reclamation of Nonmetallic Mining Sites in Wisconsin".

PUBL-WA-835 2002. July. Wisconsin Department of Natural Resources

-Bureau of Waste Management.

Shepherd Miller, Inc. (SMI), 1997. "New Impoundment Reclamation Plan Vol. I -VIII." August 5.Shepherd Miller, Inc. (SMI), 1999. "Final Design: Sweetwater Uranium Project. Volumes I through IX." Wyoming Department of Environmental Quality, 2003. "Standard Reclamation Performance Bond Format and Cost Calculation Methods, Guideline No. 12" Wyoming. November.

Appendices A -J.Kennecott Uranium Company 2004 Surfty Update -updated 7-1-04.doc MFG, Inc.July 2004 5

APPENDIX A COST ESTIMATE SWEETWATER URANIUM PROJECT 2004 Surety Update) Wyoming Operations Worksheet I (Revision

2. July 2004)Mill Area Decommissioning i A. Demolition Area (f 2) Volume (f 3) Cost'Mill Building 48,175 722,625 $361,313 SIX Building 26.400 396,000 $198,000 Main Shop 22,550 338.250 $169,125 Administration Bldg 13,050 195,750 $97,875 Tire and Lube Bldg 9,000 135,000 $67,500 Misc Buildings 10,000 150,000 $75,000 Tank #1 (75ft Diam) 4,418 66,268 $33,134 Tank #2 (65 ft Diam) 3,318 49,775 $24,887 Tank #3 (50 ft Diam) 1.963 29,452 $14,726 Misc Tanks 1,600 24,000 $12,000 Quonset Hut and Misc Buildings

$13,445 Subtotal:

$1,067,005 B. Concrete Demolition and Disposal

_Area (f 2) Volume (ft 3) Cost'Mill Building 48,175 24,088 $125,790 SIX Building 26,400 13,200 $68,933 Main Shop 22,550 11,275 $58,881 Admin Bldg 13,050 6.525 $34,075 Tire and Lube Bldg 9,000 4,500 $23,500 Misc Buildings 10,000 5.000 $26,111 Tank #1 (75ff Diam) 4,418 2,209 $11,536 Tank #2 (65 ft Diam) 3,318 1.659 S8,664 Tank #3 (50 ft Diam) 1,963 982 S5,127 K> Misc Tanks 1,600 800 $4,178 C. Chemdcal Disposall Quantity Volume (ft) CostC lIon Exchange Resin 174,740 lbs 2,496 $456 Subtotal:

$367,251 Mil Area Decommissioning Total: $1,434,256 Notes: ' RSMeans Heavy Construction Cost Data, 2003 Cost estimate of $0.50lf c A Guide to Preparing and Reviewing FinancialAssurance For Reclamation of Nonmetallic Mining Sites in Wisconsin, 2002 p. 19-20* As presented In reference above, Concrete Disposal $6.00/cy; Concrete Demolition

$2.501cy.C Guideline No. 12 Standard Reclamation Performance Bond Format and Cost Calculation Method, Wyoming DEQ, 2003* Assuming 70 Ibft density Demolition Includes removal of piping, Insulation and electrical equipment Insulation on site does not contain asbestos Electrical equipment on site does not contain PolychlorInated Blphenyls (PCBs)Materials retrieved from the dismantling of the mill will be placed inside the tailings Impoundment It was assumed, for this estimate, that there will be no salvageable materials from the mill facility P:\181113\Surety Estimate'2004 Estimate -Final 21-04 (1).xls.xds 7104 SWEETWATER URANIUM PROJECT 2004 Surety Update Wyoming Operations Worksheet 2 (Revision 2, July 2004)ISoil Reclamation andRevegetation lA. Soil Reclamation and Revegetation Area (ft 2) Volume (1 3) Cost Notes Scoping Survey 240 ac -586,400 * $355/ac Performnance Evaluation Survey --540.000 Lump Sum Soil Removal -155,567 CY $248,907 be $1.6/cy.Site Grading/Ripping 67 ac -$23.450 d 5350/ac Grading and Ripping Overburden Cover (1.5ft thick) 20 ac 48,400 CY 560,500 d S1.25/cy.TopSoil Replacement 67 ac 5,472,225 5253,344 d $1.25/cy.TopSoil Regrading 67 ac -520.1 00 d 5300/ac Grading Chiseling, Seeding, Mulching and 67 ac -$35,556

530.69/ac Crimping (Including Seed and Straw)Total Soil Reclamation and Revegetation 5768,257 Notes:* Based on MFG, Inc. Proposed Costs b Includes Catchment Basin and surrounding areas OA Guide to Preparing and Reviewing Financial Assurance For Reclamation of Nonmetallic Mining Sites In Wisconsin, 2002 p. 19-20 d Guideline No. 12 Standard Reclamation Performance Bond Format and Cost Calculation Method, Wyoming DEQ, 2003* Costs based on actual revegetation work performed for Kennecott Uranium In September 2003 by MGM Enterprises, Inc. Change Order No. 12 -September 2, 2003.* 2004 estimate includes Inberg Millers estimate of 26,500 CY of soils containing concentrations of Ra-226 higher than 16.4 pC/g located In the Catchment Basin plus 111,000 CY of petroleum contaminated soils In the vicinity and windblown materials.

The Inberg Miller volume estimate includes some overlap, where dually contaminated soils exist as per submittal dated May 12. 2004 'Request for Amendment to Final Design -Vol 6 -Part 2, Mill Decommissioning Addendum to the Existing Impoundment Reclamation Plan".P:.181113\Surety Estimate\2004 Estimate -Final 21-04 (1).xds.xls rev 7/04 SWEETWATER URANIUM PROJECT 2004 Surety Update Wyoming Operations Worksheet 3 (Revision 2, July 2004)C (IGroundwater

.7-Corrective Action Program (CAP) Restoration' Unit Unit Rate Quantity Cost Comments Pumping -Electricity 1 Inspection 2 Acidization or Chlorination 2 Meter Cleaning 2 Meter Replacement 2 Pump Replacement 2 Miscellaneous Electric 2 Quarterly Sampling 2 Pumping Wells 2 Semi Annual Sampling 2 Monitoring Wells " hour hour each each each each lump sum samples hour sample hour$0.239$28$85$35$115$600$600$335$28$335$28 8,760 1460 10 30 4 1 40 20 76 76$2,094$40,880$848$1,050$460$600$600$13,400$560$25,460$2,128 5 pumps (using 5 HP or 3.73 kw) running year round One employee 4.0 hr per day One employee 2 hours2.314815e-5 days 5.555556e-4 hours 3.306878e-6 weeks 7.61e-7 months plus chemicals One employee 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months plus supplies Cost to Replace meter Pump costs $400 plus 4 hours4.62963e-5 days 0.00111 hours 6.613757e-6 weeks 1.522e-6 months of employee time to replace Estimate 10 Pumping Wells @ I sample/well/quarter 0.5 hour5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months per well fro technician to sample 38 Monitoring Wells I hours per well to sample Summary of Annual Costs for 1 Year $88,079 CAP Costs for 10 Years ---$880,794 Assume 10-year timeframe adequate to terminate CAP Well Abandonment 2 per well $1,250 68 $85,000 Abandoned using concrete plug and overdrilling casing TOTAL CAP Restoration

$1,141,953 NOTES: 1 Electric costs per hour for operation of all 10 pumps based on Pacific Corp Schedule 25 rate of $0.06411 kw-hr (1-888-221-7070) 2 Based on MFG, Inc. 2004 costs* The 2004 CAP Plan includes 7 pumping wells In the vicinity of the tailings impoundment, and 3 pumping wells in the vicinity of the catchment basin.P:\181113\Surety Estimate\2004 Estimate -Final 21-04 (1).xls.xls 7/04

( ( C SWEETWATER URAMIUM PROJECT 2004 Surety Update Wyoming Operationa Wotrhetd 4 (Revision

2. July 2004)A. Dewtrint iAttm Unit Unit Rate Quantity Cost Comments Wei Completion Per Weii 5,000 10 $50,000 Based on MFG costs. 2004 Quarty Sampling sample $335 40 $13,400 10 Pumping Wets, 4 times yearly Pumping Wetis hour S28 10 S280 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months per well to sample Seam Anrial Sampling sample S335 20 se,700 10 Monitortng Wens, twice yearly Montorn Wets hour S28 10 5280 1 hours1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months perwen to sample Pumonho Eieceicty hour S0.239 8,760 S2.094 5 pumps (usino 5 HP or 3.73 kwi running veer round Subtotal Dewatering:

$72,754 B. Eartheork item Unit Rate Area (fi) Volure (yd') Cost Tailings Regradng' 50.75 350.000 S262.500 Seed Detvery (ChIse"n.Furoviing, CrImping.

$198.45 83 e -16.305 Fertilfznt)g)

Stlrew Dery' $238.81 83eo .S19,821 Seed Mulch 94.43 B3 t -7.921 SubTotal Earthwork:

S308,547 C. Cover Placement Itm Rate Volume yd) Cost Comments Mov embankment' S0.90 1,283,000 51,138.700 Eidsng quantity Covertopsol' 11.25 108,000 5135,000 1,951,488SFx1.8t1*108,000CY Place overburden in' S1.25 93,000 S118.250 Remaining cover requirement Margintopsodt' 51.25 93.000 S118,250 1,484,000-1,203,000.108,000-93.000yd3 SubTotal Cover Placemant:

S1,504.200 D. NESiAP Analysis Analysis' Cosvcanrrster Cannisters Total Cost NESHAP Testing 15500 110 58,050 Sample Set up/Rebeival 5851hr 220 hwa S18,700 Shipping fees .* $500 Report Pparation 51009hr 18 hrs 51500 Subtotal NESHAP Testing 528,850 E. Settlement Monitoring Ktm Cost/Acre CostdQuarter Total Cost (3 years)Ouarterly Survey (3 years) 150 acres' S52.50 17,875 194,500 Subtotal Settlement Analys 194.500 TOTAL EXISTING IMPOUNDMENT 12.004,851 Notes: 'Based on MFG, Inc 2004 costs'Guideline No. 12 Standard Redamation Performance Bond Fomat and Cost Catluletion Method, Wyoming DEQ, 2003'Costs based on revegetator bid presented to Kennecoft Uranium. September 2003 by MGM enterprises, Inc'Costs of analysts based on ERG Labs analytical semices sheet 2003; cost of cotiection and report preparation based on 2004 MFG proposed costs Survey costs based on RS Means 2003, cost of topographic survey per acre PA\181113'2004 Surety EstimateU004 Estimate -Final 21-04 (1s x4 70 rev. 7104 SWEETWATER URANIUM PROJECT 2004 Surety Update\yJ Wyoming Operations Worksheet 5 (Revision 2, July 2004)I RP,1inloninal Siurvv Roninrnn-I......-; --A. Soil Samolina Analysisb Cost Samples/acre Costs/acre Total Uranium $15.00 3 $45 Digestion for Radiochemistry

$37.50 3 $113 Radium 226 $112.50 3 $338 Collecting Samples $85/hr 1 hr/acre $12,750 Data Analysis and Report Preparatior SIOhr 40 hr $4,000 Total per acre $580 Costs Mill area (67 ac) $38,860 Costs Impoundment (83 ac) $48,140 TOTAL COSTS -SOIL SAMPLING $91,000 B. Decommissioning Equipmentb Item Hours Costs/hr Total Costs Scan/end of day 60 $100 $6,000 Scan/free release equipment 40 $100 $4,000 Data Analysis and Report Preparation 40 $100 $4,000 TOTAL DECOMMISSIONING

$14,000 C. Gamma Survey Itemb Acres Cost/Acre Total Costs Radiological Support and Soil Survey 160 $1,000 $160,000 Site Verification c 160 $1,000 $160,000 Data Analysis and Report Preparation 120 hrs $100/hr $12,000 TOTAL GAMMA SURVEY $332,000 D. Environmental Monitoring' Item Weeks Costtwk Total Costs Air Pump 24 $125 $3,000 Calibration Equipment 24 $150 $3,600 Air Monitoring Sampler 24 $20 $480 Data Analysis and Report Preparation 40 hrs $100/hr 4000 TOTAL ENVIRONMENTAL MONITORING

$11,080 E. Personnel Monitoring Itemb Costs/sample Total Costs Bioassay Urinalysis

$50 $3,000 Personal Radiation Badge Testing $30 $600 Data Analysis and Report Preparation (40 hrs) $100/hr $4,000 TOTAL PERSONNEL MONITORING

$7,600 TOTAL RADIOLOGICAL SURVEY$455,680 Notes:* Costs from Energy Labs, Casper, WY Cost Sheet Version 2003. www.energylab.com bRadiation Testing and Monitoring Program based on MFG, Inc. Specifications

'Assuming 6-month project completion C Costs adapted from recent scans using GPS based equipment as well as costs outlined in'Integrated Project Schedule for the Closure of the Dawn Mining Company Millsite" Appendix H. November 20,2003. Prepared by MFG, Inc.Public Record, Washington Department of Health P:%181113%Surety estimate\2004 Estimate -Final 21-04 (1).xIs.xIs rev 7/04 SWEETWATER URANIUM PROJECT 2004 Surety Update\,~ Wyoming Operations Worksheet 6 -Summary (Revision 2, July 2004)ILong Tem Surveillance Fees A. Maintenance Fee Item Long Term Surveillance Fee a Adjusted based on I Cost$698,301 Consumer Price Index (CPI). All Urban Consumers Subtotal Maintenance Fee Total cost Maintenance

$698,301$698,301 Notes: ' Maintenance fee based on December 1978 cost of 250,000, adjusted annually for inflation based on CPI, All Urban Consumers P:l 8111 3\Surety Estimate\2004 Estimate -Final 21-04 (1).xls.xls version 2, July 2004 SWEETWATER URANIUM PROJECT K> 2004 Surety Update Wyoming Operations Worksheet 7 -Summary (Revision 2, July 2004)1I. MILL DECOMMISSIONING A. Demolition Worksheet 1 $1,067,005 B. Concrete Decontamination, Demolition and Disposal Worksheet 1 $367,251 C. Chemical Disposal Worksheet I $456 1I. TOTAL MILL DECOMMISSIONING

$1,434,256 III. TOTAL SOILS RECLAMATION

$768,2577 Jill. TOTAL CAP RESTORATION

$1,141,953 IV. EXISTING IMPOUNDMENT RECLAMATION A. Dewatering Worksheet 4 $72,754 B. Earthwork Worksheet 4 $306,547 C. Cover Placement Worksheet 4 $1,504,200 D. NESHAP Analysis Worksheet 4 $26,850 E. Settlement Monitoring Worksheet 4 $94,500lIV. TOTAL EXISTING IMPOUNDMENT RECLAMATION

$2,004,851 IV. RADIOLOGICAL SURVEY MONITORING A. Soil Sampling Worksheet 5 $91,000 B. Decommissioning Equipment Worksheet 5 $14,000 C. Gamma Survey Worksheet 5 $332,000 D. Environmental Monitoring Worksheet 5 $11,080 E. Personnel Monitoring Worksheet 5 $7,600 IV. TOTAL RADIOLOGICAL SURVEY MONITORING

$455,680 IVI. TOTAL LONG TERM SURVEILLANCE FEES $698,3011 Mobilization/

Demobilization a $290,250 Contingency 15% $870,750lTOTAL RESTORATION AND RECLAMATION 2004 $7,664,2981 Notes: a Mobilization/demobilization fees 5% based on Califomia Financial Assurance Guidelines for Surface Mining P:\181113\Surety Estimate\2004 Estimate -Final 21-04 (1).xls.xls rev 7/04 Response to Comments 1. Table 5-1 A revised version of Table 5.1 NRC Standby Environmental Mfonitoring Summary with changes in red text is attached, as requested.

Please see Appendix 2.2. Reasons for Testing in the Catchment Basin Area Drilling in the vicinity of the Catchment Basin was begun on August 18, 2003. This drilling was performed in response to a sample containing diesel range organics excavated from approximately nine (9) feet below the Catchment Basin bottom on January 6, 2003. The Catchment Basin bottom was investigated because it was always known to be only lined on the sides with concrete, but not on the bottom. The fact that the Catchment Basin lacked a bottom liner was also known to the Nuclear Regulatory Commission (NRC), as a commitment for resumed operations was required in Volume VII of the Final Design -Operations Plan, dated September 26, 1997, stating: The sides of the catchment basin are concrete-lined and the bottom will be lined with concrete prior to resumed operations.

The mill has not operated since April 15, 1983. Aerial photographs dated September 25, 1980 (pre-operational), September 28, 1981, March 25, 1982 and July 26, 1982 all showed the Catchment Basin filled with fluid. The September 29, 1981 and March 25, 1982 photographs showed the basin filled with brown fluid. Based on the knowledge that the basin lacked a concrete bottom and the knowledge that it was filled in four aerial photographs taken over three years, an investigation was undertaken.

These photographs are included on page 5 of this Response to Comments.3. Updated Sample Data Updated sample data is included for TMWs-90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 104, 105, 111, 112, 113 and 115, as requested.

Please see Appendix 4.4. Organic Groundwater Plume Map The requested organic plume map is included in Appendix 3 of this submittal, entitled "Catchment Basin -Battle Spring Aquifer Hydrocarbon Contamination Map". In addition to the wells recently completed around the Catchment Basin, the two potable water wells (PWW-1 and PWW-2) north of the Catchment Basin were sampled and found to be free of any organics.

Sample data for these wells is included with this submittal in Appendix 4. TMW-52, an existing tailings impoundment monitor well, was also sampled for organics in September, October and November of 2003. The September 15, 2003 sample contained

3.8 micrograms

per liter naphthalene.

Subsequent samples were free of organics.5. Impacts of the Contaminated Material on the Tailings Impoundment and the Environment The contaminated material contains Natural Uranium, Radium-226 and Thorium-230 as the primary radiological contaminants, in concentrations ranging up to 153 picocuries per gram for Natural Uranium, 75 picocuries per gram for Radium-226 and 123 picocuries per gram for Thorium-230.

This material is radiologically similar to the existing tailings in the impoundment.

Radium-226 concentrations for the tailings (based upon twenty (20)) samples as reported in Table A-5 of Final Design Volume VI -Existing Impoundment Reclamation Plan, averaged 70.9 picocuries per gram, ranging from 11.6 to 188 picocuries per gram.The contaminated materials are soils/earthen materials.

The contaminated material also contains petroleum hydrocarbons (diesel and oil range organics) ranging from Non-Detect to 4870 milligrams per kilogram.

The primary contaminant is diesel range organics.

This contamination is from materials routinely used in the mill process. The mill incorporates a solvent extraction (SX) circuit. This circuit uses an organic based solvent consisting of 95% kerosene (a vehicle), 2.5% isodecyl alcohol (to promote phase separation) and 2.5% tertiary amine (the compound that binds/removes the uranium from the aqueous phase).The hydrocarbon contamination found in the soils is derived from kerosene based solvent extraction fluids that seeped out of the bottom of the basin into the underlying soils. Since this kerosene-based solvent was part of the mill circuit, it is by default also present in the tailings in the tailings impoundment.

Sweetwater Uranium Project- Source Material License SUA-1350 15 July 2004 Response to Comments 1.

It is planned to excavate approximately 120, 000 cubic yards of material around the Catchment Basin. This volume is small when compared to the approximately

2.5 million

tons of tailings that are currently in the impoundment.

Addition of these contaminated soils into the tailings impoundment will not create any new environmental impacts or impacts on the tailings impoundment over and above those impacts created by materials already present in the impoundment.

6. Additional Proposed Standards a. General Considerations The State of Wyoming stipulates (Chapter 17 -Wyoming Water Quality Rules & Regulations, October 31, 1994 Section III) that the Applicable, Relevant and Appropriate Standards (ARARs) for protecting groundwater quality will be the Environmental Protection Agency (EPA) Safe Drinking Water Program Maximum Contaminant Level (MCL) concentrations.

In the event that no MCLs are provided by the EPA, the regulations state: For those situations where a MCL does not exist for drinking water quality, the following procedures will be used to calculate an acceptable drinking water concentration.

For non-carcinogenic chemical compounds or elements, a drinking water equivalent level (DWEL) is determined A DIWEL is defined as a medium specific (i.e., drinking water) lifetime exposure level, assuming 100% exposure from that medium, at which adverse, non-carcinogenic health effects would not be expected to occur. Because LUST remediation actions may require several years to complete and since groundwater quality in Wyoming must be protected as a potential drinking water source(s), these calculations will be based upon a chronic exposure scenario.A. Non-carcinogenic substances:

DWEL = (RfD)(ABIf9(HQ)/(D WI)(AB)(FOE)

B. Carcinogenic substances:

ADWL (RSK)(ABIF)(LIFE)1(CPF)(D V)(AB)(FOE)(DUR) where;DWEL= Drinking water equivalent level, mg/L.ADWYL= Acceptable drinking water level, mg/L RISK = Cancer risk factorfor drinking water, (I x 10 -6).ABW = Average body weight over exposure period (62 kg).CPF = Oral cancer potencyfactor (mg/kg-day)

-1 ; chemical specific.RJD = Oral reference dose (mg/kg-day);

chemical specific.DWI = Drinking water intake, 2 Lday.AB = Gastrointestinal absorption rate (1.0).LIFE = Lifetime (70 years).DUR = Duration of exposure (30years).

FOE = Frequency of exposure, (350 days/365 days = 0.96).HQ = Hazard quotient (1.0).Values for oral toxicological reference doses (RfD) and/or cancer potency factors (CPF) will be obtainedfrom current data in either the US. Environmental Protection Agency's Integrated Risk Information System (IRIS) or the EPA Health Effects Assessment Summary Tables (HEAS7) toxicity data sources. If an oral reference dose or cancer potency factor is not listed in the above data base sources, the administrator will determine an acceptable drinking water concentration using the latest available scientific information.

The average body weight (ABWI) of 62 kilograms for potential 70-year carcinogenic substances exposures was established using the following time-weighted calculation:

ABWI = (5 yr) (12 kg) + (8 yr) (35 kg) + (57yr) (70 kg)70yr Sweetwater Uranium Project -Source Material License SUA-1350 15 July 2004 Response to Comments 2.

ABIV = 62 kg In some cases, the State of Wyoming has provided a Drinking Water Equivalent Level (DWEL). If such a level is provided, it is found in Appendix I of Chapter 17 Wyoming Water Quality Rules and Regulations.

In addition, in some cases, while no MCL is available, the EPA will provide a recommendation to protect human health.The standards proposed in this document were discussed with Mark Thiesse of the Department of Environmental Quality (DEQ) Water Quality Division (WQD) in a telephone conversation on Tuesday, July 13, 2004.b. Naphthalene Naphthalene is listed in 10 CFR 40, Appendix A, Criterion

13. The EPA has no MCL for naphthalene.

Chapter 17, Appendix I of the Wyoming Water Quality Rules and Regulations provides a Drinking Water Equivalent Level (DWEL) of 1.3 milligrams per liter for naphthalene.

1.3 milligrams

per liter is the proposed groundwater protection standard for naphthalene.

c. 1,1, dichloroethane This compound is listed in 10 CFR Part 40 Appendix A Criterion 13 and has been found in well samples around the Catchment Basin. No maximum concentration limit is provided for I, I, dichloroethane.

Chapter 17, Appendix I of the Wyoming Water Quality Rules and Regulations provides a Drinking Water Equivalent Level (DWEL) of 3.0 milligrams per liter for 1,1, dichloroethane.

Thus, 3.0 milligrams per liter is the proposed groundwater protection standard for 1,1 ,dichloroethane.

d. Chloromethane (Methyl chloride)This compound is listed in 10 CFR Part 40 Appendix A Criterion 13 and has been found in well samples around the Catchment Basin. No maximum concentration limit exists for chloromethane.

Chloromethane is discussed in the IRIS database, however no reference dose is provided.

The discussion concerning chloromethane is provided in Appendix 1 of this submittal.

The Agency for Toxic Substances and Disease Registry Division of Toxicology, in their Toxicological Profile for Chloromethane (http://wwv.atsdr.cdc.cov/toxprofiles/tplO6.html), provides a Regulations and Advisories document that cites a reference dose for chloromethane of 0.004 milligrams/kilogram-day. (Table 7-1 Regulations and Guidelines Applicable to Chloromethane).

Using this reference dose, the following concentration is calculated:

(0.004 mg/kg-day)(62 kilograms)(l)/(2 L/day)(1)(0.96)

= 0.129 milligrams per liter.Thus, a groundwater protection standard of 0.12 milligrams per liter for chloromethane is proposed.e. 1,1, dichloroethene/1,1,dichloroethylene 1,1, dichloroethene is listed in 10 CFR Part 40 Appendix A Criterion 13 as 1,l,dichloroethylene.

A maximum concentration limit (MCL) of 0.007 milligrams per liter (7 micrograms per liter) exists for this substance.

1,1,dichlorethene has only been found in a single well, TMW-96, at levels not exceeding

1.1 micrograms

per liter. The only other occurrence of this substance has been at levels not exceeding

2.6 micrograms

per liter in TMW-105, one of the two wells recovering perched fluids west of the Catchment Basin. A groundwater protection standard of 0.007 milligrams per liter (7 micrograms per liter) is proposed.f. 1,2,4 trimethylbenzene/1,3,5 trimethylbenzene 1,2,4 trimethylbenzene has been detected in TMW-90 and 105. 1,3,5 trimethylbenzene has been detected in TMW-90. These wells do not sample the Battle Spring Aquifer. They were completed to collect accumulated perched fluid at a depth of approximately forty (40) feet below the ground surface on the west side of the Catchment Basin. No form of trimethyl benzene has been detected in the Battle Spring Aquifer itself.Sweetwater Uranium Project -Source Material License SUA-1350 15 July 2004 Response to Comments 3.

There are no listed MCLs for any form of trimethyl benzene. It is not listed in the EPA's Integrated Risk Information System. It is not listed in Agency for Toxic Substances and Disease Registry, Division of Toxicology toxicological profiles.Given that no form of trimethylbenzene has been found in the aquifer itself and the fact that it is not listed in 10 CFR Part 40 Appendix A Criterion 13, no standard is proposed.Methyl ethyl ketone has been detected in small quantities in some samples in the following well(s): TMW-91, TMW-92, TMW-102 and TMW-1 05. Methyl ethyl ketone is a major ingredient in primer and glue used to connect PVC pipe. The methyl ethyl ketone discovered in the above listed wells is believed not to be derived from the aquifer but rather from pipe fitting materials.

In TMW-91, methyl ethyl ketone concentrations have dropped from 9.8 milligrams per liter to non-detect.

This well was completed using primer and glue (as opposed to threaded pipe and screen) and the rapid drop in concentration indicates that this contaminant is not in the Battle Spring Aquifer, but rather is derived from the casing. In TMW-92, methyl ethyl ketone was detected in the initial sample and has been non-detect in all subsequent samples. TMW-102 exhibits low levels (24 to 41 micrograms per liter) with the June 15, 2004 sample being non-detect.

TMW-105 (which is not a Battle Spring Aquifer well, but a perched fluid recovery well) exhibited methyl ethyl ketone in two samples; 250 micrograms per liter on March 23, 2004 and 25 micrograms per liter on June 15, 2004. The concentrations have declined by an order of magnitude and are believed to be related to the piping.The high concentrations of methyl ethyl ketone in PVC glue and primer are clearly shown in the analysis results for PVC primer and cement provided in Appendix 5. PVC primer contains 543,000 milligrams per kilogram (54.3%)methyl ethyl ketone and PVC cement contains 150,000 milligrams per kilogram (15%) methyl ethyl ketone.Thus, since it is not believed to be a groundwater contaminant, methyl ethyl ketone was not listed in the original amendment request and no ground water standard is proposed for it. Testing will continue for methyl ethyl ketone since it is included in the normal suite of volatile organic chemicals.

Should it appear that piping materials are not the source and that it is derived from the aquifer, a groundwater protection standard will be proposed.7. Presence of a Groundwater Plume The leakage of fluids from the Catchment Basin involves contamination of the upper portion of the Battle Spring Aquifer around the basin. Since contamination of an aquifer is involved, Kennecott Uranium Company requests prompt consideration of this submittal so that groundwater remediation efforts can begin as soon as possible.Sweetwater Uranium Project -Source Material License SUA-1350 Response to Comments 15 July 2004 4.

Catchment Basin Aerial Photographs ,ii.89t -~ -.S t' L--.'x r Catchment Basin -September 25, 1980 Catchment Basin -September 28, 1981 Catchment Basin During Operations

-March 25, 1982 Catchment Basin -July 26, 1982 Sweetwater Uranium Project- Source Material License SUA-1350 15 July 2004 Response to Comments 5., .

Table of Contents I ItKennecott tI =,Energy Kennecott Uranium Company Sweetwater Uranium Project Docket No. 40-8584 SML #SUA-1350 RESPONSE TO COMMENTS RE: License Amendment Request- May 12, 2004'M Appendix 1 Chloromethane Discussion Appendix 2 Revised Table 5-1 Appendix 3 Catchment Basin -Battle Spring Aquifer Hydrocarbon Contamination Map Appendix 4 Updated Sample Data 15 July 2004 Appendix 5 Glue and Primer Analysis Results VL AVERnY'READY INDEX' INDEXING SYSTEMF

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___ _ __ -re Full IRIS Summary C QuickView Methyl chloride (CASRN 74-87-3)view Ouick View '-MAIN CONTENTS.1 ., Chronic Health -Hazards tor Non-Carcinogenic Effects Reference Dose for Chronic Oral xposure LRMD}IReference Dose for Chronic Oral Exposure (RfD) -_, 1 -I_NVole: A TOXICOLOGICAL REVIEW is available for this chemical in Adobe* PDF format (95 Pages, 337 Kbytes). Similar documents can be found in the List of Available IRIS *roxicological Reviews.Links to specific pages in the toxicological review are available throughout this summary. To utilize this feature, your Web browser and Adobe program must be configured properly so the PDF displays within the browser window. If yoiu browser anid.-Adobe nrogram need configuration.

Please eo to the IRIS Hem Pace forinstructions.

- Oral RfD Summajy-Principal and Supporting Studies-Uncertainty and Modifying Factorsl Additional Studiesl Comments-Confidence in the Oral RfD-EPA Documentation and Review Reference Conc.ntrat.ion Ior 1003 Methyl chloride; CASRN 74-87-3 (07/17/2001)

Health assessment information on a chemical substance is included in IRIS only after a comprehensive review of chronic toxicity data by U.S. EPA health scientists from several Program Offices and the Office of Research and Development.

The summaries presented in Sections I and II represent a consensus reached in the review process. Background information and explanations of the methods used to derive the values given in IRIS are provided in the Background Documents.

STATUS OF DATA FOR Methyl chloride File First On-Line 07/17/2001 Chronic Inhalaton Exposure (RfC)-Inhalation RfC summary-EPrncl and Supporting Studies-Uncertainty and-iloditrlng ractors-Additional Stud iest Comnents-Confidence In the inhalation RIC-EPA Documentation and Review. a Carcinopenicfty Assessment for Lifetime Exposure Evidccrc f-r Human Carcinogenicity

-Weihht-of-Evidence-tiurnan C_.. rF n..,_-AnimaI C -'arnobenicitv Data-Supporting Data for Carcinouenicity Quantitative Estimate Last Revise Category (section)Oral RfD Assessment (1.A.)Inhalation RfC Assessment (I.B.)Carcinogenicity Assessment (II.)Status not available 07/17/2001 on-line 07/17/2001 r,-,,, .on-line -t,;, ,0711712001 ,d_1. Chronic Health Hazard Assessments for Noncarcinogenic Effects http://ww5Xw.epa.gov/iris/subst/1003.htm 7/12/2004 l.A. Reference Dose for Chronic Oral Exposure (RfD)Substance Name -Methyl chloride CASRN 87-3 Last Revised -07/17/2001 The oral Rcference Dose (RID) is based on the assumption that thresholds exist for certain toxic effects such as cellular necrosis.

It is expressed in units of mg/kg-day.

In general, the RID is an estimate (with uncertainty spanning perhaps an order of magnitude) of a daily exposure to the human population (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a lifetime.

Please refer to the Background Document for an elaboration of these concepts.

RfDs can also be derived for the noncarcinogenic health effects of substances that are also carcinogens.

Therefore, it is essential to refer to other sources of information concerning the carcinogenicity of this substance.

If the U.S. EPA has evaluated this substance for potential human carcinogenicity, a summary of that evaluation will be contained in Section II of this file._I.A.1. Oral RID Summary Not applicable.

Methyl chloride exists primarily as a gas. No adequate oral exposure studies exist from which an oral RID may be derived._I.A.2. Principal and Supporting Studies (Oral RfD)of Carcinogenic Risk from Ural Evadswe-Summary of Risk%Estimates-Additonal Comment-Discussion of Confidence Quantitative Estimate of Carcinogenic Ris from Inhalation q SummsrY ef R;sk Estimates Dose-Re onse Data-Additional Comrnynts-Dhescusn of Conflden-9 EPA Documentation.

Bibriography

Revision History* syngnvms Not applicable.

_I.A.3. Uncertainty and Modifying Factors (Oral RfD)Not applicable.

_I.A.4. Additional Studies/Comments (Oral RfD)Not applicable.

_I.A.5. Confidence in the Oral RfD Not applicable.

_-i.A.6. EPA Documentation and Review of the Oral RfD Source Document--

U.S. EPA, 2001_I.A.7. EPA Contacts (Oral RfD)Please contact the IRIS Hotline for all questions concerning this assessment or IRIS, in general, at (202)566-1676 (phone), (202)566-1749 (fax), or hotline.iris(aeaggov (Interne address).Back to top_I.B. Reference Concentration for Chronic Inhalation Exposure (RfC)Substance Name -Methyl chloride'J http://lwvwv.epagov/iris/subst/l 003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection AgencyP Page 3 of 17 CASRN 87-3 Last Revised -- 07/17/2001 The inhalation Reference Concentration (RfC) is analogous to the oral RfD and is likewvise based on the assumption that thresholds exist for certain toxic effects such as cellular necrosis.

The inhalation RfC considers toxic effects for both the respiratory system (portal-of-entry) and for effects peripheral to the respiratory system (extrarespiratory effects).

It is generally expressed in units of mg/m 3.In general, the RfC is an estimate (with uncertainty spanning perhaps an order of magnitude) of a daily inhalation exposure of the human population (including sensitive subgroups) that is likely to be without an appreciable risk of deleterious effects during a lifetime.

Inhalation RfCs were derived according to the Interim Methods for Development of Inhalation Reference Doses (EPA/600/8-88/066F August 1989)and subsequently, according to Methods for Derivation of Inhalation Reference Concentrations and Application of Inhalation Dosimetry (EPA/600/8-90/066F October 1994).RfCs can also be derived for the noncarcinogenic health effects of substances that are carcinogens.

Therefore, it is essential to refer to other sources of information concerning the carcinogenicity of this substance.

If the U.S. EPA has evaluated this substance for potential human carcinogenicity, a summary of that evaluation will be contained in Section II of this file._I.B.1. Inhalation RfC Summary Critical Effect Exposures*

UF MF RfC Cerebellar lesions NOAEL: 50 ppm (103.2 mg/iM 3)NOAEL(ADJ):

94.6 mg/in 3 Mouse 11 -day continuous NOAEL(HEC):

94.6 mg/M 3 1,000 1 9E-2 inhalation study .mg/m 3 LOAEL: 100 ppm (206.4 mg/M 3)Landryetal., 1983, 1985 LOAEL(ADJ):

189.2mg/M 3 LOAEL(I IEC): 189.2 mg/M 3*Conversion Factors and Assumptions:

MW = 50.49. Assuming 250 and 760 mmHg: NOAEL (no-obscrved-advcrse-cffect level) (mg/M 3) = 50 ppm x 50.49/24.45

= 103.2 mg/M 3; LOAEL (ADJ) (lovest-observed-adverse-effect level) =103.2 mg/m 3 x 22 hour2.546296e-4 days 0.00611 hours 3.637566e-5 weeks 8.371e-6 months s/24 hours x 7 days/7 days = 94.6 mg/M 3.Methyl chloride is a Category 2 gas (U.S. EPA, 1994) for which periodicity was assumed to be attained for systemic effects and for which the blood:gas partition coefficients for humans (Nolan et al., 1985) and rats (Gargas et al., 1989) yield an approximate 1:1 ratio. The assumption is that the partition coefficient for the mouse would be similar to that for the rat on the basis of the tabulation of Gargas et al. (1989), who reported that blood:gas partition coefficients for 6/7 chemicals are similar for both the rat and mouse.In addition, it is a defensible assumption that is wvithin the range of current modeling practice.Thus, a regional gas dose ratio (RGDR) of 1.0 was applied to calculate a human equivalent concentration (IIEC) for the NOAEL, resulting in an HEC of 94.6 mg/M 3.Note: ADJ =duration-adjusted concentration.

_I.B.2. Principal and Supporting Studies (Inhalation RfC)Dysfunction of the central nervous system (CNS) is a hallmark for toxicity due to methyl chloride both in human case reports and in short- and long-term studies in laboratory animals.The 2-year CIIT study (1981), which is the only long-term intermittent (6 hour6.944444e-5 days 0.00167 hours 9.920635e-6 weeks 2.283e-6 months s/day, 5S days/wveek) inhalation study currently available, would typically have been chosen for identification of the critical effect (e.g., cerebellar lesions) because it satisfies the criteria set forth in U.S. EPA (1994) in spite of several procedural errors (e.g., some misidentification of mice, pregnancy of some mice, and an exposure error early in the study). However, the continuous (22-22.5 hr/day) I l-day exposure of the female C5713L/6 mouse (Landry et al., 1983, 1985) is considered more appropriate in the context of protecting public health for the http://wwivwv.epa.gov/iris/subst/1003.htm 7/12/2004I following reasons: 1. The study was wvell conducted.

2. Cerebellar lesions (considered the most critical effect in the context of known CNS deficits from human case reports) occurred at continuous exposure levels (100 ppm)and at intermittent levels (400 ppm) far below those in the B6C3F 1 strain exposed chronically (1,000 ppm) in the 1981 ClIT study.3. No cerebellar lesions were observed in the 90-day pilot study in the B6C3F 1 mouse (Mitchell et al., 1979) at levels up to 1,500 ppm.4. Continuous exposure of C57BL/6 mice resulted in mortality at 200 ppm, wNhereas intermittent 2-year exposure of the B6C3FI mouse did not cause mortality below 1,000 ppm.Landry, TD; Quast, JF; Gushobw, TS; et al. (1983) Methyl chloride:

inhalation toxicity in female C57BL/6 mice continuously or intermittently exposed for II days. EPAIOTS Doc#878213687, NTIS/OTS0206357.

Landry, TD; Quast, JF; Gushow, TS; et al. (1985) Neurotoxicity of methyl chloride in continuously versus intermittently exposed female C57BL/6 mice. Fundam Appl Toxicol 5 (1): 87-98.Continuous exposure of female C57BU/6 mice (12/group) to 100 ppm and higher (22 hour2.546296e-4 days 0.00611 hours 3.637566e-5 weeks 8.371e-6 months s/day for I I days) caused degenerative changes (slight in all 12 at 100 ppm and moderate to severe in 100% of animals at higher levels) in granule cells of the cerebellum; higher exposure levels (150 ppm and above) also led to a moribund condition and death. There were no cerebellar lesions or mortality at 15 and 50 ppm. No histopathological evidence of damage in the spinal cord area or to peripheral nerves was reported at any exposure level. Decrements in neurofunctional testing (ability to stay on an accelerating rod after 4, 8, and 11 days of exposure) w ere observed at 150 ppm. Decreased glycogen content in 100- to 200-ppm mice was the principal significant change observed in the liver, although focal periportal hepatocellular degeneration and/or necrosis was noted in the 400 ppm group. There was no histological evidence of kidney lesions. Duration-dependency of cerebellar lesions was observed upon serial necropsy of 150-ppm animals (5/time period except on day 11 when 12/time period were sacrificed), faith moderate degeneration and neurofunctional deficits on day 4 (not days I and 2) and a moribund condition by day 10.5.Mice were also exposed intermittently (5.5 hour5.787037e-5 days 0.00139 hours 8.267196e-6 weeks 1.9025e-6 months s/day) for Il days to 0, 150, 400, 800, 1,600, or 2,400 ppm. A concentration-related increase in the cerebellar incidence of granule-cell pyknosis and karyorrhexis (slight) wvas observed in the 400-ppm and higher groups.Decreased hepatocyte size, without degeneration or necrosis, was variably seen in mice from the 400- through 2,400-ppm groups. Decreases in mean absolute and relative thymus weights were statistically significant and considered exposure-related (reflecting decreased body weights and stress) for the 2,400 and 1,600 ppm groups; the latter group evidenced a decrease in the size of the thymus. Evidence of kidney toxicity was found only in the 2,400-ppm group and consisted of slight multifocal tubular degeneration and regeneration, and eosinophilic-staining tubular casts. Inanition was apparent in the 2,400-ppm group, as was thin, watery blood from the heart, a finding supported by low blood packed cell volume. The splecns of this group were considerably enlarged, suggestive of extramedullary hematopoiesis, which was microscopically confirmed.

The in-life observation of red urine in the 2,400-ppm group was determined to result from hemoglobinuria consistent with intravascular hemolysis.

These animals deteriorated (e.g., hind limb extensor rigidity) and were sacrificed moribund on days 8-9.Based upon cerebellar damage, this study identifies a NOAEL and LOAEL of 50 and 100 ppm, respectively, for continuous exposure.

For intermittent exposure, the NOAEL and LOAEL are 150 and 400 ppm, respectively.

http://NvAvlv.epagov/iris/subst/l 003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection Agency Page 5 of 17 CIIT. 1981. Final report on a chronic inhalation toxicology study in rats and mice exposed to methyl chloride, conducted by the Battelle Columbus Laboratories for the Chemical Industry Institute of Toxicology.

EPA/OTS Doc #878212061, NTIS/OTS0205952.

Groups of F-344 rats and B6C3F1 mice (1l7-120/sex/species/concentration) were exposed 6 hr/day,5 days/wvk, for up to 24 months to concentrations of 0,50,225, or 1,000 ppm (0,103, 465, or 2,065 mg/M 3) of 99.97% pure methyl chloride.

Duration-adjusted exposure levels wvere 0,8.9,40.2, or 178.6 ppm (18.4, 83.0, or 368.8 mg/Im 3).Mouse: Mouse mortality was significantly increased in females (beginning at 10 months) at 1,000 ppm compared with controls, but wvas unaffected at 50 and 225 ppm. Signs suggestive of CNS toxicity (e.g., tremor, paralysis) were noted only in 1,000-ppm mice. Neurofunctional impairment (clutch response) wvas found in nearly all 1,000-ppm mice of either sex after 18-22 months of exposure.

This finding, was supported by the histopathological observation of cerebellar lesions (degeneration and atrophy of the granular layer) that first appeared in 1,000-ppm male and female mice at the 18-month sacrifice.

It did not occur in the 0,50, or 225 ppm groups.At the 24-month end-of-study sacrifice, there was no difference in incidence of spinal cord axonal swelling and degeneration between exposed and control mice. Hepatocellular lesions (vacuolization, karyomegaly, cytomegaly, multinucleation, degeneration), first noted at 6 months in 1,000 ppm male mice, wvere found with increasing frequency at 12 and 18 months and wvere seen in the majority of males suffering unscheduled deaths. Renal tubuloepithelial hyperplasia and karyomegaly wvere first apparent in 1,000-ppm male mice at 12 months, subsequently increasing in incidence and severity until the last males in this group were sacrificed at 21 months. Seminiferous tubule atrophy and degeneration were also statistically significant and considered exposure-related in 1,000-ppm males. Finally, 1,000-ppm mice developed splenic atrophy and lymphoid depletion during months 6-22 that wvas considered related to methyl chloride exposure.

In mice, 1,000 ppm was identified as an FEL on the basis of high mortality.

-Rat: There was no treatment-related mortality in the rat. The testes were the only target organs examined in the rat that were considered to have significant gross or histopathologieal lesions (bilateral, diffuse degeneration and atrophy of the seminiferous tubules) related to methyl chloride exposure (1,000 ppm). At the 18-month period, age-related interstitial hyperplasia and/or adenomas wvere present in controls and the 225-ppm group; these lesions exhibited an increasing incidence with level of exposure.The testicular results in rats are consistent wvith a LOAEL of 1,000 ppm, based on early signs of seminiferous tubule degeneration and atrophy in the absence of age-related degeneration.

A NOAEL of 225 ppm appears reasonable because tubule degeneration and atrophy at this exposure level occurred upon onset of age-related hyperplasia and compressive adenomas.A shortcoming of this study relates to some incorrect sexing (periodic pregnancies were observed in the mouse population) and misplacement of specific mice. The investigators considered the problem serious but not one that threatened the validity of interpretation of the experimental results. This conclusion appears reasonable considering that the types of effects and the levels at which they occurred were confirmed in several shorter term studies.McKenna, MJ; Burek, JD; Henck, JW; et al. (198 la) Methyl chloride:

a 72-hour continuous (23-1/2 hr/day) inhalation toxicity study in dogs and cats. EPA/OTS #878210220, NTIS/OTS0206129.

Three groups of three male beagle dogs (ages 7-8 mo) and three male eats (ages 8-9 mo),were exposed for approximately 23.5 hr/day for 3 days (i.e., 72-hr treatment regimen) to methyl chloride concentrations of 0, 200, or 500 ppm. After 48 hr of treatment, 500-ppm dogs appeared more tranquil, wvith one exhibiting intermittent tremor and slight excess salivation, but all were judged alert and responsive.

Immediately after 72 hr of treatment, control and 200-ppm dogs wcrc comparable.

However, all 500-ppm dogs appeared weak and displayed a range of adverse effects that varied in severity from animal to animal. These included hind http://vwwv.epa.gov/iris/subst/l 003.htm 7/12/2004 and fore limb stiffness and incoordination, occasional slipping and falling, inability to sit up or walk, limb tremor, and excessive salivation.

Improvement was noted in all 500-ppm dogs by postexposure day 10, which continued until termination on day 27.Neurological evaluations and gross and histopathology revealed no trcatment-related abnormalities in control or 200-ppm dogs. whereas each of the three 500-ppm dogs exhibited various clinical deficiencies (posterior paresis, opisthotonus, extensor tonus, and intention tremors).

By 26 days postexposure, spinal reflexes and postural reactions wvere normal, balance was maintained normally, and wvalking with intermittent ataxia was observed.

All three 500-ppm dogs displayed lesions in the brain and spinal cord (vacuolization, swollen cosinophilic axons, axon loss, demyclinization, and microglial cells that contained phagocytosed debris), which were characterized as generally very slight to slight and multifocal in nature. The lesions wvere localized to the brain stem and the lateral and ventral funiculi ol the spinal column, and wvere not observed in the cerebrum, cerebellum, or peripheral nerves. During the first 48 hr of exposure, the 200- and 500-ppm cats evidenced a decline in appetite that then recovered, and after 24 hr they appeared less active than controls, but always were alert and displayed no signs of inactivity or sluggishness upon removal from the exposure chamber. Throughout the 2-weelk recovery period, 200 and 500 ppm cats were comparable to controls.

Brain and/or spinal cord lesions wvere found in control (1/3), 200-ppm (1/3), and 500-ppm (3/3) cats. Several characteristics of these lesions led the authors to speculate that they were likely the result of a postvaccinal reaction, a viral infection, or both;however, it wvas recognized that exposure to 500 ppm methyl chloride could possibly have exacerbated such a disease process. The findings of this study indicate a NOAEL of 200 ppm for a continuous (nearly) 72 hr exposure to methyl chloride, and a LOAEL of 500 ppm based principally upon a spectrum of clinically and histopathologically observable neurological efTfects seen in male beagle dogs. In a second study by the same investigators, there %vas no evidence of brain or spinal cord lesions in male beagle dogs exposed for 6 hr/day, 5 days/week for a total of 64-66 exposures to concentrations of 0, 50, 150, or 400 ppm (McKenna et al., 1981b).These histopathological effects (e.g., cerebellar lesions), as w"ell as other testicular effects (e.g., decreased sperm count sperm granulomas), were also seen in shorter term studies (Buraketal., 1981; Morgan etal., 1982; Chapinetal., 1984; Working etal., 1985ab)at levels of 500 ppm and greater. Thus, the results of these shorter-term studies lend support to the NOAEL and LOAEL from the Landry et al. (1983) study.__l.B.3. Uncertainty and Modifying Factors (Inhalation RfC)UF= 1,000.A factor of 10 is used to protect sensitive human subpopulations (intraspecies variability).

It is clearly established that in rodents (probably in humans as wvell), methyl chloride is principally metabolized in the liver via a GSII-conjugation mediated pathway. The unknown susceptibility of the two human subpopulations identified in several studies on the basis of differences in their rates of metabolism of methyl chloride in erythrocytes is considered sufficient justification for the intraspecies uncertainty factor of 10. In vivo pretreatment of laboratory animals with a specific inhibitor of y-glutamate-cysteine ligase resulted in the elimination of lethality and cerebellar lesions, clearly indicating that reaction (metabolism) products of GSII xxith methyl chloride play a key role in the manifestation of cerebellar and other target organ lesions (Chellman, 1986ab). Whether there is susceptibility on the basis of gender is another concern because there is limited, but not convincing, evidence that female C57BL/6 mice have a higher incidence (and severity) of cerebellar lesions than males or other mouse strains and rats at intermittent short-term exposure concentrations

>500 ppm (Morgan et al., 1982).A factor of 10 is used to extrapolate from an I1l-day continuous study to a lifetime inhalation study. In the typical situation in which only a subchronic intermittent rodent inhalation exposure study is available, a full factor of 10 is generally applied to account for the lack of chronic intermittent exposure results. Although the Il -day study is not fully equivalent in http://\vww.epa.gov/iris/subst/1003.htm7//20 7112/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmeitfil Protection Agency Page 7 of 17 duration to a subchronic study; it is a valuable continuous inhalation study supported by the conclusions of a chronic study. A factor of 10 is thus considered protective to account for using a less-than-chronic study for the derivation of the RWC.A factor of 3 (101/2) is used to account for interspecies variability in extrapolating from animals to humans considering that a dosimetric adjustment accounts for the pharmacokinetic portion of the interspecies uncertainty factor. Only the C57BL16 female mouse was examined under continuous exposure conditions; therefore, it is unknown how the male or B6C3F 1 mice would react upon similar exposure conditions.

The only strain comparisons that were made wvere those of Morgan et al. (1982), and they ivere under intermittent exposure conditions at relatively high concentrations; thus, a factor of 3 is considered prudent.A database uncertainty factor of 3 (10l) is used for lack of brain histopathology in F, generation mice. The effect of exposure on in utero development of the brain in mice has not been examined and remains an important data gap.The product of the two factors of 3 (1011) coalesces to a 10.MF = 1._I.B.4. Additional Studies/Comments (Inhalation RfC)In humans, methyl chloride acts principally as a depressant of the CNS. Typical signs and symptoms of intoxication have been described as appearing within 2-3 hr of exposure, including headache, nausea, vomiting, painful neck, loss of appetite, diarrhea, dizziness, giddiness, blurred vision, ataxia, confusion, slurred speech, diplopia (double vision), tremors of the hands and lips, drooping eyelids and eye twitch, muscle spasms, convulsions and opisthotonus (body spasms), cold and clammy skin, loss of memory, hallucinations, respiratory depression, unconsciousness, coma, and death (ATSDR, 1998; Ellenhorn and Barceloux, 1988; Farber and Torkelson, 1989; IPCS, 1999; Sittig, 1991). Effects of longer term, lowv-level exposure are thought to be generally, although not always, mild and reversible after a recovery period of days to months, and include fatigue or malaise, loss of appetite, headache, disequilibrium, blurred vision, confusion, anxiety, personality changes, short-term memory loss, vertigo, loss of coordination, weakness, pale skin, nausea, and vomiting.Evidence suggests that in persons exposed to doses of methyl chloride sufficient to cause serious CNS effects, other organ systems including the heart, gastrointestinal tract, liver,.kidneys, and lungs can be adversely affected, although the cardiovascular and gastrointestinal effects may largely be secondary to CNS toxicity (ATSDR, 1998; IPCS, 1999; Farber and Torkelson, 1989).In a two-generation reproduction study in F-344 rats exposed intermittently (I 0-week exposure periods followed by 10-week recovery periods) to 0, 150,475, or 1,500 ppm methyl chloride, degeneration and atrophy of the seminiferous tubules in all 1,500 ppm F 0 males (10/10) w.ere observed, in addition to increased incidences of epididymal sperm granulomas (3/10) and decreased testes size in these latter three animals (Hamm et al., 1985). This study identified a two-generation reproductive LOAEL based on statistically significant reduced male fertility at 475 ppm (fertility returned to control levels after 10 weeks of recovery), with -..a corresponding NOAEL of 150 ppm. There wvas no clear effect of exposure on fertility of the F, generation (no histopathology w%-as performed) other than a reduced percentage of male offspring in the 475-ppm group compared X ith controls and the 150-ppm group.In a study of female F-344 rats and female C57B1/6 mice (bred to C3H males) exposed to concentrations up to 1,500 ppm during gestation, the mouse progeny (B6C3F,) exhibited a small but statistically significant increase in the incidence of a heart anomaly in the 500-ppm group only (Wolkowski-Tyl, 1983a). No such effects wvere seen in rats. In a further extension of this work, female C57BL/6 mice bred to C3H males wvere exposed to 0,250, 500, or 750-ppm (Wolkowski-Tyl et al., l 983b). The 750-ppm level was maternally toxic and heart http://wvwvv.epa.gov/iris/subst/l 003.htm 7/12/2004 malformations were observed in both male and female progeny at 500 and 750 ppm, but not at 250 ppm. Because this lesion was not observced in another laboratory (John-Greene et al., 1985) under a different exposure protocol, some uncertainty exists regarding the exposure conditions tinder which this lesion occurs, although it is prident to regard methyl chloride as a mouse teratogen.

For more detail on Susceptible Populations, exit to the itvii ogicaLre iew. SecriknA 47 (PDF).__I.B.5. Confidence in the Inhalation RfC Study -- High Database -- Medium RfC -- Medium The overall confidence in the RIC assessment is medium. Although the confidence in the principal and supporting studies is high, overall confidence in the database is medium because of the lack of brain histopathology on F 1 generation mice, particularly female C57BL/6, a strain that may be particularly sensitive to the cffects of methyl chloride.

There is suggestive evidence that methyl chloride may cross the placenta (Bus et al., 1980) and, given the known effects of methyl chloride on the cerebellum, is cause for concern about the lack of histopathological data in offspring of exposed laboratory animals. A reproduction/teratology study in the rat through the F 1 generation has been performed and provides some support for effects on the male reproductive system, but no brain histopathology was performed.

For more detail on Ch aracterization of Hazard anti I)ose Response, exit to the taoicolo-gial rekwe jtion 6 (PDF).__I.B.6. EPA Documentation and Review of the Inhalation RfC Source Document -- U.S. EPA, 2001 This assessment wvas peer revieved by external scientists.

Their comments have been evaluated carefully and incorporated in finalization of this IRIS summary. A record of these comments is included as an appendix to the Toxicological Review of Methyl Chloride.

To reiewt this appen ev, .ut to the toxicologpel resels: jAppenmv AunVamaofanal Response to External Peer Rerienw Cominentv (PD F).Agency Consensus Date 6/26/2001 Scrcening-l.evel Literature Review Findings -- A screening-level review conducted by an EPA contractor of the more recent toxicology literature pertinent to the RfC for Methyl chloride conducted in August 2003 did not identify any critical new studies. IRIS users who know of important new studies may provide that information to the IRIS Hotline at hotline.irfis(ipa gov or 202-566-1676.

__I.B.7. EPA Contacts (Inhalation RfC)Please contact the IRIS Hotline for all questions concerning this assessment or IRIS, in general, at (202)566-1676 (phone), (202)566-1749 (fax), or hotline.iris'ePagov (Internet address).Back to top http:lvxvww.

epa.gov/iris/subst/

1 003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection Agency Page 9 of l17_11. Carcinogenicity Assessment for Lifetime Exposure Substance Name -Methyl chloride CASRN -- 74-87-3 Last Revised -- 07/17/2001 Section II provides information on three aspects of the carcinogenic assessment for the substance in question; the wveight-of-evidence judgmerit of the likelihood that the substance is a human carcinogen, and quantitative estimates of risk from oral exposure and from inhalation exposure.

The quantitative risk estimates are presented in three ways. The slope factor is the result of application of a low-dose extrapolation procedure and is presented as the risk per (mg/kgyday.

The unit risk is the quantitative estimate in terms of either risk per pg/L drinking wmater or risk per pg/rM 3 air breathed.

The third form in which risk is presented is a concentration of the chemical in drinking water or air associated fith cancer risks of I in 10,000, 1 in I 00,000, or I in 1,000,000.

The rationale and methods used to develop the carcinogenicity information in IRIS are described in The Risk Assessment Guidelines of 1986.(EPA/600/887/045) and in the IRIS Background Document.

IRIS summaries developed since the publication of EPA's more recent Proposed Guidelines for Carcinogen Risk Assessment also utilize those Guidelines where indicated (Federal Register 61(79):17960-1801 1, April 23, 1996). Users are referred to Section I of this IRIS file for information on long-term toxic effects other than carcinogenicity.

JI.A. Evidence for Human Carcinogenicity

__I.A.1. Weight-of-Evidence Characterization Methyl chloride is found ubiquitously in nature and exists primarily as a gas, with inhalation as the predominant route of exposure.

Ho vever, it is moderately soluble in water, which suggests that ingestion of drinking water containing methyl chloride can be a secondary route of exposure.Applying the criteria for evaluating the overall weight of evidence for carcinogenicity to humans outlined in EPA's guidelines for carcinogen risk assessment (U.S. EPA, 1986), methyl chloride is most appropriately designated a Group D -Not classifiable as to its human carcinogenicity.

Using the Proposed Guidelines for Carcinogen Risk Assessment (U.S.EPA, 1996), the available data suggest that methyl chloride would be classified as an agent whose carcinogenic potential cannot be determined.

Limited human epidemiology studies show no suggestive evidence that methyl chloride exposure was associated with a carcinogenic response.

However, weak to moderate mutagenicity has been demonstrated in S. typhimurium (albeit at high concentrations), and an increased incidence of tumor formation (benign and malignant) in male mouse kidneys does provide some suggestive information of carcinogenic risk, although no renal tumors were found in female mice or in either sex of rats tested in the same study. In addition, induction of sister chromatid exchanges (SCE) by methyl chloride has been observed in human lymphoblasts, and by a congener, methyl bromide, in lymphocytes from a human subgroup categorized as "slow metabolizers." This group is known to be genetically predisposed (polymorphisms in glutathione transferase) to have a lower rate of metabolism compared with the majority of human populations studied.The lack of detectable CYP2EI protein in human kidney (in contrast to mice, which have high levels) suggests that the metabolism of methyl chloride by P450 (presumably leading to elevated formaldehyde concentrations) that could be responsible for the induction of male mouse kidney tumors may not be relevant to humans. Howvever, the role of hepatic (and/or kidney) metabolism (leading to potential genotoxic metabolites) via the predominant GSH pathway (or even by P450 isozymes other than CYP2EI) in this regard cannot be discounted; in vivo metabolism of methyl chloride to formate in liver is GSH-dependent, via the GSH-requiring formaldehyde dehydrogenase' that oxidizes formaldehyde to formate. Inasmuch as methyl chloride exposure can lower tissue nonprotein sulfhydryl concentrations, it thus has http://ww%.epa.gov/iris/subst/I 003.htm 7/12/2004 the potential to inhibit formaldehyde dehydrogenase and increase formaldehyde levels. The extent to

hich this may or may not take place in the human kidney is an area for further research.For inore detail on Characterization of Mazard and Dose Response, exit to the taricoogical reiewv, Section 6 (PDF).For more detail on Susceptible Populations, exit to the tavicological eiioro fSctanA, 7'(PDM).__I.A.2. Human Carcinogenicity Data Inadequate.

The fewv studies that have examined methyl chloride's potential carcinogenicity in humans have failed to convincingly demonstrate any association, and in one instance even indicated a lower cancer incidence than expected in workers chronically exposed to methyl chloride in a butyl rubber manufacturing plant (holmes et al., 1986). There wvas no conclusive evidence for an effect of acute, severe exposure to methyl chloride on mortality from all cancers or from lung cancer in a small cohort accidentally exposed to methyl chloride from a leaking refrigeration unit (Rafnsson and Gudmundsson, 1997); because of the Bide confidence intervals that included unity, the data cannot be construed as suggestive of an elevated cancer mortality risk Other occupational studies involved exposure to multiple chemicals in addition to methyl chloride, making it dilicult to attributc any effects specifically to methyl chloride (Dow Coming Corporation, 1992; Olsen et al., 1989)._Il.A.3. Animal Carcinogenicity Data In animals, the only evidence of carcinogenicity comes from a single 2-year bioassay, which found a statistically significant increased incidence of renal benign and malignant tumors only in male B6C3FI mice at the high concentration (1,000 ppm), although two renal adenomas occurring in 225-ppm males may also be treatment-rclated (CIIT, 1981). Neoplasia were not found at lower concentrations or at any other site in the male mouse, nor at any site or concentration in female mice or F-344 rats of either sex. Renal cortical tubuloepithelial hyperplasia and karyomegaly were also confined to ,000-ppm male mice._ii.A.4. Supporting Data for Carcinogenicity There is some evidence that methyl chloride is a weak genotoxin at high concentrations when tested in vitro; however, its in vivo cytotoxicity appears to dominate any potential genotoxic effects that may occur. Methyl chloride wvas mutagenic in Salmonella strain TA 100 at a 5%concentration (Simmon, 1981), in strain TM677 at 5 0/0-3()°/o (Fostel et al., 1985), in TA1535 at 0.50/o-0.8%

to 20.7% (Andrews et al., 1976; Longstaffet al., 1984), and in strain TA1535 at 4% and 7% and strain TA IOO at 1%, 4%, and 7% (du Pont, 1977). It has not been shown to methylate l)NA (Kornbrust et al., 1982). Methyl chloride wvas weakly positive for the in vivo induction of unscheduled DNA synthesis (UDS) in rat liver at 15,000 ppm, but not at 3,500 ppm, nor in pachytene spermatocytes or tracheal epithelial cells at either concentration (Working et al., 1986). In vitro exposure of the spennatocytes induced UDS at 3%-10%, but not 1%, %%hile in the tracheal cells the response was negative at 1%, negative but suggestively positive at 3%, and toxic at 5% and 10%. Primary cultures of human hepatocytes from three individuals were collectively negative at 0.1 0/".3% negative or weakly positive at 1%, and toxic at 2%-10% (Butterworth et al., 1989). A high concentration (20%) of methyl chloride was found to be a potent inducer of sex-linked recessive lethal mutations in Drosophila (University of Wisconsin, 1982), and 6,000-25,000 ppm (but not 3,000 ppm) enhanced viral transfonnation in cultured Syrian hamster embryo (SI IE) cells (I latch et al., 1983). An increase in the frequency of SCE in human lymphoblasts was induced by 0.3%-5% methyl chloride, although there wvas no evidence of DNA damage (Fostel et al., 1985). Finally, 2,000-3,000 ppm (but not 1,000 ppm) produced dominant lethal effects in Sprague-Dawley rats (SI, 1984) and F-344 rats (Working et al., 1985a). This dominant lethality appears attributable to cytotoxic effects on spenm in the testes rather than to direct genotoxicity, and to the effects of genotoxic oxidative metabolites resulting from an induced inflammatory littp://wwwv.epa.gov/iris/subst/1003.htm7//20 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection Agency Page 11 of 17 response in the epididymides (Chellman et al., 1986a,b, 1987; Working et al., 1985b;Working and Bus, 1986; Working and Chellman, 1989). Thus, methyl chloride has mutagenic potential, but does not appear to methylate DNA. On the other hand, both methyl chloride and methyl bromide induce SCEs in human lymphocytes in vitro; methyl bromiide induced SCE in lymphocytes from a human subgroup characterized as "slow metabolizers" in terms of glutathionc transferasc polymorphisms, but not in "fast mctabolizers." It remains to be it .established whether methyl chloride behaves similarly.

Renal tumors in the male mouse may be related to the production of formaldehyde during methyl chloride metabolism.

Generation of formaldehyde has been demonstrated in renal microsomes of male CD-I mice (Dekant et al., 1995) that exceeds that of naive (androgen-untreated) female mice, whereas kidney microsoies from the rat did not generate formaldehyde.

The P-450 isozyme believed to be responsibleCYP2El, is present in male mouse kidney and is androgen-dependent; female mice had levels only 20%/o-25%

of those in males (Dekant et al., 1995); in the rat, renal activity of CYP2EI was very low. The findings of Hu et al. (1990) show that there is a specific cellular localization of CYP2EI in mouse kidney. Cell-type-specific localization was confirmed by Cumnmings et al. (i 999), Idho found that CYP2E I in F-344 kidney *vas produced by both proximal and distal tubular cells, faith the level of certain P450 isozymes being cell-type-specific.

On the other hand, no CYP2EI activity w.as detected in human kidney microsomal samples (Aniet et al., 1977; de Waziers et al., 1990; Lasker et al., 2000), nor was it detected in freshly isolated proximal tubular cells from human kidney (Cummings et al., 2000). CYP4A1 I was detected in human kidney (Cummings et al., 2000), but its ability to metabolize methyl chloride is unknown. The only P-450 enzymes found at significant levels in human renal microsomes are, in addition to CYP4AI 1, CYP4F2 (Lasker et al., 2000) and CYP3A isoforms (Kharasch et al., 1995).According to the P450 review by Parkinson (1996), no commonly known environmental chemicals appear to be metabolized by the CYP4A family.J3ack lojop_II.B. Quantitative Estimate of Carcinogenic Risk from Oral Exposure Not applicable.

Back to top_II.C. Quantitative Estimate of Carcinogenic Risk from Inhalation Exposure Not applicable.

Back to top_II.D. EPA Documentation, Review, and Contacts (Carcinogenicity Assessment)

_II.D.1. EPA Documentation Source Document -U.S. EPA, 2001 This assessment wvas peer reviewed by external scientists.

Their comments have been http://wivw.epa.gov/iris/subst/l 003.htm 7/12/2004, cvaluated carefully and incorporated in finalization of this IRIS summary. A record of these comments is included as an appendix to the Toxicological Review of Methyl Chloride.

To re ie Iw thiv appent Lr exrt to he to-vicologicahrs ictts Apnd 4 'Vitt i nttd Responve to Fvternal Peer Resiei,' Comninentv (PI)F)_II.D.2. EPA Review (Carcinogenicity Assessment)

Agency Consensus Date 6/26/2001 Screening-Level Literature Reviewv Findings -- A screening-level review conducted by an EPA contractor of thc more reccnt toxicology literature pertinent to the cancer assessment for Methyl chloride conducted in August 2003 did not identify any critical new studies. IRIS users vsho knowv of important new studies may provide that information to the IRIS Ilotline at hotline.irisfzepagov or 202-566-1676.

__I.D.3. EPA Contacts (Carcinogenicity Assessment)

Pleasc contact the IRIS Ilotline for all questions concerning this assessment or IRIS, in general, at (202)566-1676(phone), (202)566-1749 (Fax), or hotlinejr~isjepa.gov (Internet address).Back to top_111. [reserved]

IV. [reserved]

V. [reserved]

_VI. Bibliography Methyl chloride CASRN -- 74-87-3 Last Revised -- 07/17/2001 Vl.A. Oral RfD References Not applicable.

neCk to trn_VI.B. Inhalation RfC References ATSDR. (1998) Toxicological profile for chloromethane (update).

Agency for Toxic Substances and Disease Registry.

December 1998.Bus, JS; Wolkowski-Tyl, R; Barrow, C. (1980) Alterations in maternal and fetal nonprotein sulfhydryl (NPSII) concentrations in pregnant lFischer 344 rats after acute inhalation exposure to methyl chloride.

Teratology 21(2):32A

[abstract].

Burak, JD; Potts, WJ; Gushow, TS; et al. (1981) Methyl chloride:

48 and 72 hour8.333333e-4 days 0.02 hours 1.190476e-4 weeks 2.7396e-5 months continuous http://Hvavw.epa.gov/iris/subst/1 003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection Agency Page 13 of 17 inhalation exposure in rats followed by up to 12 days of recovery.

EPA/OTS Doc#878210221, NTIS/OTS0206129.

Chapin, RE; White, RD; Morgan, KT; et al. (1984) Studies of lesions induced in the testis and epididymis of F-344 rats by inhaled methyl chloride.

Toxicol Appl Pharmacol 76:328-343.

Chellman, GJ; Bus, JS; Working, PK. (1 986a) Role of epididymal inflammation in the induction of dominant lethal mutations in Fischer 344 rat sperm by methyl chloride.

Proc Natl Acad Sci USA 83:8087-8091.

Chellman, GJ; White, RD; Norton, RM; et al. (1 986b) Inhibition of the acute toxicity of methyl chloride in male B6C3FI mice by glutathione depletion.

Toxicol AppI Pharmacol 86:93-104.

CIIT. (1981) Final report on a chronic inhalation toxicology study in rats and mice exposed to methyl chloride.

Report prepared by Battelle Columbus Laboratories for the Chemical Industry Institute of Toxicology.

EPA/OTS Doc #878212061, NTIS/OTS0205952.

Ellenhorn, MJ; Barceloux, DG. (1988) Medical toxicology.

Diagnosis and treatment of human poisoning.

New York: Elsevier Science Publishing Company, Inc., pp. 982-983.Farber, HA; Torkelson, TR. (1989) Toxicology review of methyl chloride (prepared for the Methyl Chloride Industry Association).

Submitted to U.S. EPA, I I February 1999.Gargas, ML; Burgess, RJ; Voisard, DE; et al. (1989) Partition coefficients of low-molecular-weight volatile chemicals in various liquids and tissues. Toxicol Appl Pharmacol 98: 87-99.alamm, TE, Jr.; Raynor, TH; Phelps, MC; et al. (1985) Reproduction in Fischer-344 rats exposed to methyl chloride by inhalation for two generations.

Fundam AppI Toxicol 5 (3):568-577.

IPCS. (1999) International Programme on Chemical Safety. Concise international chemical assessment document.

Methyl chloride (peer review draft, February 1999).John-Grecne, JA; Welsch, F; Bus, JS. (1985) Comments on heart malformations in B6C3F 1 mouse fetuses induced by methyl chloride -continuing efforts to understand the etiology and interpretation of an unusual lesion. Tcratology 32:483-487

[letter].Landry, TD; Quast, JF; Gushow, TS; et al. (1983) Methyl chloride:

inhalation toxicity in female C57BL/6 mice continuously or intermittently exposed for 11 days. EPA/OTS Doc#878213687, NTIS/OTS0206357.

Landry, TD; Quast, JF; Gushow, TS; et al. (1985) Ncurotoxicity of mcthyl chloride in continuously versus intermittently exposed female C57BL/6 mice. Fundam Appl Toxicol 5 (1):87-98.

McKenna, MJ; Gushow, TS; Bell, TJ; et al. (198 1a) Methyl chloride:

a 72-hour continuous

(-23-112 hr/day) inhalation toxicity study in dogs and cats. EPA/OTS #878210220, NTIS/OTS0206129.

McKenna, MJ; Burek, JD; Ilenck, JW; et al. (1981b) Methyl chloride:

A 90-day inhalation toxicity study in rats, mice and beagle dogs. In: Five reports dealing with studies of mcthyl chloride pharmaco};inctics and inhalation toxicity studies -with cover letter dated 071181.EPA/OTS Doc #40-8120723, NTIS/OTS0511317.

Mitchell, RI; Pavkov, KL; Everett; RM; et al. (1979) Final report on a 90-day inhalation toxicology study in rats and mice exposed to methyl chloride, to Chemical Industry Institute http:Hllwww xv.epa.gov/iris/subst/l 003.htm 7/12/2004 of Toxicology.

In: A ninety day inhalation toxicology study in F-344 albino rats and B6C31I1 mice exposed to atmospheric methyl chloride gas with cover letter prepared by Battelle Columbus Labs. EPA/OTS Doc #878212058, NTIS/OTS0205952.

Morgan, KT; Swecnberg, JA; I lamm, Jr., TE; et al. (1982) l listopathology of acute toxic response in rats and mice exposed to mcthyl chloridc by inhalation.

Fundam AppI Toxicol 2 (6):293-299.

Nolan, RJ: Rick, DL; Landry, TD; et al. (1985) Pharmacokinetics of inhaled methyl chloride (Cl 1 3 C1) in male volunteers.

Fundain Appl Toxicol 5(2):361-369.

Sittig, M. (1991) llandbook of toxic and hazardous chemicals and carcinogens (third ed.).Park Ridge, NJ: Noyes Publications, pp. 1086-1088.

U.S. Environmental Protection Agency (U.S. EPA). (1994) Methods for derivation of inhalation reference concentrations and application of inhalation dosimetry.

EPA/600/8-90/066F.U.S. EPA. (2001) Toxicological reviev of methyl chloride in support of summary information on the Integrated Risk Information System (IRIS). National Center for Environmental Assessment, Washington, DC. Available online from http:llwwvw.epa.gov/iris.

Wolkoxvski-Tyl, R; Phelps, M; Davis, XK. (I 983a) Structural teratogenicity evaluation of methyl chloride in rats and mice after inhalation exposure.

Teratology 27(2):181-195.

Wolko"vski-Tyl, R; La~vton, AD; Phelps, M; et al. (1983b). Evaluation of heart malformations in 136F3F 1 mouse fetuses induced by in utero exposure to methyl chloride.

Teratology 27 (2): 197-206.Working, I'K; Bus, JS; llamm, TB, Jr. (1985a) Reproductive effects of inhaled methyl chloride in the male Fischer 344 rat. 1. Mating perfonnance and dominant lethal assay.Toxicol Appl Plhanmacol 77(1):133-143.

Working, PK; Bus, JS; llamm, TE, Jr. (1985b) Reproductive effects of inhaled methyl chloridc in the malc Fischer 344 rat. 11. Spermatogonial toxicity and sperm quality. IToxicol Appl Phannacol 77(l):144-157.

BRck to ton_VI.C. Carcinogenicity Assessment References Amet, Y; Berthou, F; Fournier, G; et al. (1997) Cytochrome P450 4A and 2EI expression in humnan kidnev microsomes.

Biochem Phannacol 53:765-771.

Andrews, AW; Za%%istowski, ES; Valentine, CR. (1976) A comparison of the mutagenic properties of vinyl chloride and methyl chloride.

Mutat Res 40:273-276.

Buttervorth, BE; Smith-Oliver, T; Earle, L; et al. (1989) Use of primary cultures of human hepatocytes in toxicology studies. Cancer Res 49:1075-1084.

Chellman, GJ; 13us, JS; Working, P'K. (I 986a) Role of cpididymnal inflaummation in the induction of dominant lethal mutations in Fischer 344 rut sperm by methyl chloride.

Proc Natl Acad Sci USA 83:8087-8091.

http://Nvw rv. epa. gov/i ri s/subst/l 003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection Agency Page 15 of 17 Chellman, GJ; Morgan, KT; Bus, JS; ct al. (1 986b) Inhibition of methyl chloride toxicity in male F-344 rats by the anti-inflammatory agent BW755C. Toxicol Appl Pharmacol 85:367-379.Chellman, GJ; Hurtt, ME; Bus, JS; et al. (1987) Role of testicular versus epididymal toxicity in the induction of cytotoxic damage in Fischer-344 rat sperm by methyl chloride.

Reprod Toxicol l(l):25-35.

CIlT. (1981) Final report on a chronic inhalation toxicology study in rats and mice exposed to methyl chloride.

Report prepared by the Battelle Columbus Laboratories for the Chemical Industry Institute of Toxicology.

EPA/OTS Doe #878212061, NTIS/OTS0205952.

Cummings, BS; Zangar, RC; Noval, RF; et al. (1999) Cellular distribution of cytochromes P-450 in the rat kidney. Drug Mctab Disp 27(4): 542-548.Cummings, BS; Lasker, JM; Lash, LH. (2000) Expression of glutathione-dependent enzymes and cytochrome P450s in freshly isolated and primary cultures of proximal tubular cells from human kidney. J Pharmacol Exp Ther 293:677-685.

Dekant, W; Frischmann, C; Specrschneider, P. (1995) Sex, organ and species specific bioactivation of chloromethare by cytochrome P4502EI. Xenobiotica 25(11): 1259-1265.

De Waziers, I; Cugnenc, PH; Yand, CS; et al. (1990) Cytochrome P450 isozyme, epoxide hydrolase and glutathione transferases in rat and human hepatic and cxtrahepatic tissues. J Pharmacol Exp Ther 253:387-394.

Dowv Coming Corporation.

(1992) A case control study of respiratory cancers at the Dow Coming Midland silicones production plant (final report) with attachments and cover letter dated 022092 (sanitized).

EPA/OTS Doc #86-920000833S, NTIS/OTS0535623.

du Pont de Nemours. (1977) Mutagenic activity of methane, chloro- in the Salmonella/microsome assay. E.I. du Pont de Nemours and Company, Haskell Laboratory Report.Fostel, J; Allen, PF; Burmudez, E; et al. (1985) Assessment of the genotoxic effects of methyl chloride in human lymphoblasts.

Mutat Res 155:75-81.

Hatch, GG; Mamay, PD; Ayer, ML; et al. (1983) Chemical enhancement of viral transformation in Syrian hamster embryo cells by gaseous and volatile chlorinated methanes and ethanes. Cancer Res 43:1945-1950.

Holmes, TM; Buffler, PA; Holguin, AH; et al. (1986) A mortality study of employees at a synthetic rubber manufacturing plant. Am J Ind Med (United States) 9(4):355-362.

Hu, JJ; Rhoten, WB; Yang, CS. (1990) Mouse renal cytochrome P45011EI:

immunochemical localization, sex-related difference and regulation by testosterone.

Biochem Pharmacol 40 (12):2597-2602.

Kharasch, ED; Hankins, DC; Thummel, KE. (1995) Human kidney methoxyfluranc and sevoflurane metabolism.

Intrarenal fluoride production as a possible mechanism of methoxyfluranc nephrotoxicity.

Anesthesiology 82: 689-699..Kombrust, DJ; Bus, JS; Docrjer, G; et al. (1982) Association of inhaled [14Cqmethyl chloride with macromolecules from various rat tissues. Toxicol Appl Pharmacol 65(1):122-134.

Lasker, JM; Chen, WB; Wolf, I; et al. (2000) Formation of 20-hydroxyeicosatetracnoic acid, a vasoactive and natriurctic eicosanoid, in human kidney: role of Cyp4F2 and Cyp4Al 1. J http://wwwv"s.epago

/iris/subst/l 003.htm 7/12/2004 Biol Chem 275:4118-4126.

Longstaff, E; Robinson, M; Bradbrook, C; et al. (1984) Genotoxicity and carcinogenicity of fluorocarbons:

assessment by short-tenn in vitro tests and chronic exposure in rats. Toxicol AppI Phannacol 72:15-31.Olsen, GW; I lean, S; Cook, RR; et al. (1989) Mortality experience of a Cohort of Louisiana chemical workers. I Occup Med 31(1):32-34.

Parkinson, A. (1996) Biotransformation of xenobiotics.

In: Casarett and Doull's Toxicology:

The 13asie Science of Poisons, 5th edition (Klaussen, C., cd.) New York: McGraw-Hill, pp.113-186.Rafnsson, V; Gudmnundsson, G. (1997) Long-term follow-up afler methyl chloride intoxication.

Arch Environ Iealthl 52(5):355-359.

Simmon, VF. (I 981) Applications of the Salmonella/microsome assay. In: Short-term tests for chemical carcinogens.

Stich, I IF; San, RI IC (eds.). New York: Springer-Verlag, pp. 120-126.University of Wisconsin.

(1982) Drosophila sex linked recessive lethal test on chloromethane.

Prepared for 13ioassay Systems Corporation.

IEPA1OylS loc M40-8320708, NTIS/OTS0511304.

U.S. Environmental Protection Agency (U.S. EPA) (1986) Guidelines for carcinogen risk assessment.

Federal Register 51 (I85):33992-34003.

U.S. EPA. (1996) Proposed guidelines for carcinogen risk assessment.

Document no.FlPA/600/A-92/003C.

Washington, DC: National Center for Elnvironmental Assessment.

U.S. EPA. (2001) Toxicological review of methyl chloride in support of summary information on the Integrated Risk Infonnation System (IRIS). National Center for Environmental Assessment, Washington, DC. Available online from http://Hxvww.epa.govniris.

Wotking, IK; Bus, JS; Ilaunin, TE, Jr. (I 985a) Reproductive effects of inhaled methyl chloride in the male Fischer 344 rat. 1. Mating performance and dominant lethal assay.Toxicol Appl Phannacol 77(1):133-143.

Working, IK; Bus, IS; Ilamm, TE, Jr. (1985b) Reproductive effects of inhaled methyl chloride in the male Fischer 344 rat. I. Spennatogonial toxicity and sperm quality. Toxicol Appl Phannacol 77(1):144-157.

77(1):144-157.

Working, IK; 13us, JS. (I 986) Failure of fertilization as a cause of preimplantation loss induced by methyl chloride in Fischer 344 rats. Toxicol Appl Phanimacol 86:124-130.

Working, PK; Doolittle, )J; Smith-Oliver, r; et al. (1986) Unscheduled DNA synthesis in rat tracheal epithelial cells, hepatocytes and spernmatocytes following exposure to methyl chloride in vitro and invivo. Mutat Res 162:219-224.

Working, PK; Chellman, GJ. (1989) The use of multiple endpoints to define the mechanism of action ol reproductive toxicants and genn cell mutagens.

Prog Clin Biol Res 302:211-227.

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1003.htm 7/12/2004 Methyl chloride (CASRN 74-87-3), IRIS, Environmental Protection AgencyP Page 17 of 17_V11. Revision History Substance Name -Methyl chloride CASRN 87-3 07/17/2001 Date Section Description 04/01(1997 III., IV., V. Drinking Water Health Advisories, EPA Regulatory Actions, and Supplementary Data wvere removed from IRIS on or before April 1997.IRIS users were directed to the appropriate EPA Program Offices for this information.

07/17/2001 I.B., II., VI RfC, carcinogenicity assessment, and references first on line 10/28/2003 I.B.6., Screening-Level Literature Review Findings JI.D.2. message has been added.Back to top_VIII. Synonyms Methyl chloride CASRN -- 74-87-3 Last Revised -07/17/2001 CHLOROMETHANE MONOCHLOROMETHIANE Note: A TOXICOIOGICAI.

REVIEW is available for this chemical in Adobe* PDF format (95 Pages, 337 Kbytes). Similar documents can be found in the List of Available IRIS Toxicological Reviews.* You %vill need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPNAs PDEpage to learn more about PDF, and for a link} to the free Acrobat Reader.Back lo lop Wha's New l earchIRIS IRIS HornejlNCEA HornejlORQ Homne EPA Hone I Privacy and Security Notice I Contact Us Last updated on Thursday.

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Source Material License ISUA-1350 Sweetwater Uranium Proi ec Final Design Molume P71 Table 5- NRC Standby Environmental Monitoring Summary Category I Locations Frequency l Analytical Parameters A .Continuously, Composited Natural uranium, Ra-226, Air (Particulate)

Downwind:

Air-4A Quarterly Th-230, Pb-2l0 Air (Env. Radon) Downwind:

Air-4A Continuously with quarterly Radon-222 Upwind: Air-2 changes Gamma Downwind:

Air4A Continuously with quarterly Environmental Gamma (TLD)__ _ _ __ _ _ __ _ _ Control: Admin. Bldg. changes E n v i r o n m n t al _Gama_____

Visual inspection of condition of Weekly liner and evaporation system.Original Tailings Cell (Cell Visual inspection of liner/.C.) Orginal Tailings Cell embankment by a registered Annually engineer and biannual lab analysis of liner on even-numbered vears.railings Liquid Original Tailings Cell Monthly Fluid Level (I)Arsenic, beryllium, cadmium, chromium, Pb-210, nickel, combined Ra-226 and Ra-228, failings Impoundment Point TMW-15, TMW-16, TMW- Semiannually selenium, Th-230, natural f Compliance Wells 17, TMW-18 uranium, gross alpha, chloride, iron, nitrate, sulfate, pH and TDS Monthly (Corrective Action Water Levels_ _ _ _ _ _ _ _Program)Semiannually (3) See Table 5-5 Monthly for organics, only if Catchment Basin Point of TNMW-91 organic chemicals are present See Table 5-5b Compliance W'ell (3)Monthly (Corrective Action Water Level Program) (3) (4)36 locations:

'IMW-I, 2,3,4, Semiannually (Corrective Action See Table 5-S Tailings Monitor Well 5,6, 8, 16,24,29,31,35,36, Program) T a b l e _ _-5 (TMW) Sampling and Water 37,44,45,47,48, 49,50,51, Monthly (Corrective Action Water Levels Levels 52,53, 56, 57, 61, 62, 63, 64, Program)69.70.71, 78, 82. 84 and 89 Monthly Water Levels Semiannually (3) See Table 5-5 Catchment Basin Monitor 14 locations:

TMW-92, 93, Monthly for organics, only if Well (TMW) Sampling and 94, 95, 97,98,99, 100, 101, organic chemicals are present See Table 5-5b Water Levels 10, 111, 112, 113 and II5 (3)Monthly (3) (4) Water Levels Failings Impoundment Quarterly (Corrective Action See Table 55-Pumpback Well Sampling (as 7 locations:

TMW-7, 17, 18, Program)required by the Corrective 57, 58, 59 and 75 Monthly (Corrective Action Water Levels Action Program) (2) Program)Quarterly (Corrective Action See Table 5-5 Catchment Basin Pumpback Program) (3M Well Sampling (as required by 3 locations:

TMW-91, 96 and onthly for organics, only if the Corrective Action 102 organic chemicals arc present See Table S-Sb Program) (2) (3)Monthly (Corrective Action Water Levels Program) (3) (4)3 locations:

PWW-1, PWW-2 Dissolved and suspended natural Potablc Water Well Quality and DrakW-l Quarterly uranium, Ra-226, Th-230, Pb-_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _2 10 PWW-1, PWW-2 Monthly Water Levels Wind speed and direction, sigmaltheta, temperature, Meteorological Monitoring Meteorological Station Continuously precipitation, pan evaporation, barometric pressure and relative humidity (I) Except when frozen.(2) Pumpback wells may be added or removed from service with the goal of improving the performance of the CAP -License Condition 11.3.(3) Except when inaccessible due to excavation work. etc.(4) Except when blocked by a pump.Kennecart Uranium Company Revision 4 32 April 28. 2004

-.KENNECOTT URANIUM COMPANY__________

TM W -90__ _ _ _ __ _ ___ _ ___ _ ___ _ _NORTHING:

148,811.42 Groundwater EASTING: 323,958.91 Protection________

ND= Non-detectable Standard 08/126/03 09/08/03 09/15/03 10/14103 01/19/04 02111/04 03/17/D4 04/08/04 05/01/04 08/10)/04 FILDDAA m : (GIRS)____

__ ______Temnperature (C) as of S/8198 8 8 8 8 18, 12 10. 21 23 pH (SW. Units) _____ 5.6 5.8 5.8 4.8 8.1 5.8 4.3 5.4 5 Cond. (umho/cm)

______ 940 1080 1080 1000 880 1220 780 840 1000 TDS_ _ _ _ _ _ _ _ __ _ _ _Pump _ _ _MAJOR IO NS / ______ _ _ __ ___ down; _ _ _ _Alk-CaCO3

_____ 40 2 ____3 6.2 ien____Bicarbonate (HC03 _____ 48.8 2.4 3.7 7.6 hole.Calcium (Ca)_____

198 207 195 179 ___Carbonate (C 03 _ _ _ _ __ _ _ -1 _ _ _ _ _ _ 1 -1 _ _ _ _ _ _ _Chloride (Co)_____

33.14 47.5 45.1 38.3 Fluoride (F ____ 0.2 0.4 0.3 0.2 Magneslum M g _ _ _ __ 28 33.9 32.4 29 _ _ _ _ _ _ _Nitrate-N (N03 6.8 -0.1 -0.1 ____-0.1 Potassium K)49.8 5.1 5.7 ____5.5________

Silica (SiO2) 55.6 54.8 45.6 ___ ___ 44.9 Sodium (Na) 733 52.2 52.31____

48.4 _______Sulfate (SO41) ______ -0.1 881 7671____ 682 NON-METALS:__

___ _ _ __ _ _ _nide (CN) _____ -0.005 -0.005 .0.005 ____-0.005

__ ___PHYSICAL PROPERTIES:

_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Cond (umho/crn)

______ 1400 1670 1510 ___ ___ 1320, H GPL(.8 6.04 4.69 4.96 ___ 6.22 TDS 180 C. GPS (500) 1140 1350 1190 996 __ ___METALS-DISSOLVED m _____ ___ __Aluminum ____ ____ 0.2 2.2 0.1 -0.1 _ _ _ _ _ _ _Arsenic (As) GPS (.05) -0.001 -0.5 -0.002 -0.001 0.001 Brium (Ba)_____

-0.1 -10 .0.1 -0.1 -0.1 _______Be hium (Be) GPS (.01) .0.01 .0.01 -0.01 -0.01 Boron (B 0.18 0.15 0.12 0.11 Cadmium (Cd) GPS (.01) -0.005 -0.1 0.008 -0.005 ___ ___ -0.005 ___Chromium (Cr) GPS (.05) -0.01 -0.5 .0.01 -0.01 ___ -0.01 _______Cobalt (Co)_____

0.06 0.087 0.071 0.059 Coppr (Cu -0.01 0.03 0.03 -0.01 Irn Fe) ..28.4 49 29.1 ___ 25.1 _______Lead (Pb) -0.01 -0.5 0.02 -0.01 ____ ___ -0.01 _______Ma!nqanese (Mn) 1.33 1.49 1.21 1.17 _______MercuH) -0.0002 -0.02 -0.0004 -0.00021 -0.0002 e rnu (MO)__ -0.01 -0.01 -0.01 _ _ _ _ _ _ _ -0.01 _ _ _ _ _ _ _Nickel (Ni) GPS (.01) 0.07 ___ 0.12 0.091 0.09 _______Seenium (Se) Gps (.01) 0.013 -0.1 0.01 0.009 0.007 Silver (A )-0.01 -0.5 -0.01 -0.01 _ __ ___ -0.01 Thallium __ _ _ _ _ -0.01 _ _ _ _ _ _ -0.01 -0.01 -0.01 _ _ _ _ _ _ _Vanadium (V05) -0.1. -0.1 -0.1 _______ -0.1 Zinc (ZN) 0.65 0.87 0.88 0.28 RADIOMETRIC pCll:__ _ __ _ __ _ _ _ _ _ _ _ _Uranium, natural GPS (36)- 182 240 126 27.8 Radium 228 23 ___ 10.8 15.2 13.7 Radium Precision+/

1.6 0.7 1.3 1.2 __ ___Radium 228 5.6 11.3 3.4. 15.8 Radium Precision

+/ 1.7 ___ 2.1 1.5 1.8 ___Comb. Ra226/228 GPS (5.8)- 2.6 ___ ___ 22.1 18.6 29.31____Thorium 230 GPS (7.0)- -0.2 -0.2 -0.2 -0.2 Tho uriu Precision

.,'-__ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ __ _ _ _ _ _ _ _ _Lead (Pb2lO) GPS (13.9)- -2.7 -2.7 -2.7 -1 Lead Precision 1 _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Gross Alpha GPS 15' 22.1 ___ __ 12.1 22.2 14.8 G~sA aPei~n+-2.2 1.1 1.5 1.1 __ ___ORGANICS:

_ _ _ _ _ _ _ _ _ _ _Dipe~ag~9anics (DRO) (mg&I) I11 13 45 1500 13 1 1 94 ___ 320 GasolineBange mnc(GO 0.132 0.117 0.105 0.093 105 0.058 0.129 0.058 1111,11-Trichloroethane M ND ND 2.8 ND ND 2.5 5.5 ____ 1.1 1,2,4-Trimeth~ylbenzene (u/)ND ND ND ND ND ND 3.7 ____ ND 1.3,5-Trimethylbenzene (L1& -ND ND ND ND. ND ND 1.1 ____ ND Naphthalene 21 25 35 67 28 2.6 34 ___ 1.9 OUALITY ASSURANCE DATA:___________

___DS AfCBalance (dec. %) 0.98 1.12 1.08 ________ 1.03 _______(LAB: Energy Labs Inc. unless noted.) I__ _ _ _ _ __ _ _ _ _ _ __ _ _ _ I _ _ _ _ _ _ _ _

KENNECOTT URANIUM COMPANY TMW-91 NORTHING:

148,518.38 Gnxrndwater EASTING: 323,956.86 Protection ND = Non-detectable Standard 08126/03 09/18103 1012203 11112/03 12110103 12131/03 01113/04 02/16/04 03/17104 04/12/04 FIELD DATA mg/: (GPS)Temperature (C) *as of 528198 8 8 8 8 8 8 8 8 8 9 pH (Std. Units) 6.3 6.8 6.8 6.7 7.2 7.3 7.9 7.2 7.1 6.8 Cond. (umho/cm) 520 860 980 900 1100 1080 1240 1100 1240 960 TDS I _ _ _MAJOR IONS mm:_Alk-CaCO3 85 121 118 Bicarbonate (HC03) 103 148 143.Calcium (Ca) 65.9 _ 355 320 Carbonate (C03) .1 1 Chloride (CI) 17.6 67 43.6 Fluoride (F) 0.3 -1 0.1 Magnesium (Mg) 7.3 33 26.4 Nitrate-N (NO3) -0.1 -0.1 -0.1 Potassium (K) 5.2 6.3 5.6 Silica (SiO2) 8.5 13 11.1 Sodium (Na) 87.8 72 69.5 Sulfate S04) 303 908 839 NON-METALS:

nide (CN) -0.005 -0.005 .0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 801 1800 1920 pH GPS (r8) 7.76 7.89 7.86*DS @ 180- C. GPS (500) 534 1440 1570 METALS-DISSOLVED mg-/: Aluminum (Al) -0.1 -0.1 -0.1 Arsenic (As) GPS (.05) 0.002 0.002 -0.001 Barium (Ba) -0.1 -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 -0.01 Boron (B) -0.1 -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 -0.005 Chromium (Cr) GPS /.051 -0.01 -0.01 -0.01 Cobalt (Co) 0.003 0.003 0.002 Copper (Cu) -0.01 -0.01 -0.01 Iron (Fe) -0.05 -0.05 0.209 Lead (Pb) -0.01 -0.01 -0.01 Manganese (Mn) 0.08 0.34 0.36 Mercu H) 0.0005 -0.0002 -0.0002 Mo (num -0.01 -0.01 -0.01 Nickel (Ni) GPS (.01) -0.01 -0.01 -0.01 Selenium Se) GPS (.01) 0.003 -0.001 -0.001 Silver (A ) -0.01 -0.01 -0.01 Thallium (.0) -.01 -0.01 -0.01 Vanadium (V205j -0.1 -0.1 -0.1 Zinc eN) 0.04 0.27 0.031 RADIOMETRIC pCli1: .Uranium, natural GPS (36r 110 39.8 37.9 Radium 226 1.6 2.5 3.1 Radium Precision

+1- 0.3 0.3 0.6 Radium 228 -1 3.3 3.5 Radium Precision

+/- 1.2 0.9 Combined Ra226i228 GPS (5.8)- 1.6 5.8 6.6 Thorium 230 GPS (7.0)- -0.2 -0.2 -0.2 Thorlum Precision

+/Lead (Pb2l0) GPS (8.9)' -2.7 -2.7 -2.7 ead Precision

+I-Gross Alpha GPS 15' 2.5 3.6 4 Goss ha Precision

+- 1 1.2 1.4 ORGANICS:

___ __ ______DiResel RangeOrganics (DRO ) 130 40 52 6.2 35 130 16 21 6.7 5.7 Gasoline Range Organics (GRO) (rngL) 1.9 1.5 0.749 0.182 1.9 0.046 ND 1,1,1-Trichloroethane 15 15 ND ND ND ND ethyl ethyl ketone (ugL 9800 7400 4400 1200 430 68 ND ND ND Nphthalene (ug. 58 30 17 4.6 2.7 58 ND 1.4 ND ND Toluene Iug/L ND ND ND ND ND ND ND ND ND ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) __1.14 (LAB: Energy Labs Inc. unless noted.) I I_- --

KENNECOTT URANIUM COMPANY TMW-91 NORTHING:

148,518.38 Groundwater EASTING: 323,956.86 Protection ND = Non-detectable Standard 05111/04 06/15104 FIELD DATA mgl: (GPS)Teperature (C) *as of 52898 10 12 pH (Std. Units) 7.8 7.2 Cond. (umholcm) 1000 1280 TDS MAJOR IONS mqA: Aik-CaCO3 Bicarbonate (HCO3)Calcium (Ca)Carbonate (C03)Chloride (CI)Fluoride (F)Magnesium i'Mg)Nitrate-N (N03)Potassium (K)Silica (SiO2)Sodium (Na)Sulfate (S04)NON-METALS:

Cyanide (CN)PHYSICAL PROPERTIES:

Cond (umho/cm)pH GPS (6.8)TDS (t 180° C. GPS (500)METALS-DISSOLVED m gl: Aluminum (Ai)Arsenic (As) GPS (.05)Barium lBa)Beryilium (Be) GPS (.01)Boron (B)Cadmium (Cd) GPS (.01)Chromium (Cr) GPS (.05)Cobalt (Co)Copper (Cu)Iron (Fe)Lead (Pb)Manganese (Mn)Mercur (Hg)_ _ _ _ _MolyWenum (Mo)Nickel (Ni) GPS (.01)Selenium (Se) GPS (.01)Silver (Ag)Thallium (Tl)Vanadium (V205)Zinc (QN)RADIOMETRIC pCId: Uranium, natural GPS (36)_Radium 226 Radium Precision

/-Radium 228 Radiun Precision

/-Combined Ra2261228 GPS (&B)_Thorium 230 GPS (7.0)'Thorium Precision

/-Lead (Pb210) GPS (8.9)_Lead Precision

1-Gross Alpha GPS 15 Goss Alha Precision

+*-ORGANICS: Diesel Range Organics (DRO) (g) 21 3.1 Gasoline Ran Organics (GRO) (/L) ND ND 1,1,1 -Trichloroethane LiL) ND ND Methyl ethyl ketone 519i ND ND Naphthalene ND ND Toluene ND 2.6 QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %)(LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-92 NORTHING:

148,504.47 Groundwater 5 EASTING: 323,951.33 ProtecionC ND = Non-detectable Standard 12/3/2003 12/10/03 12/16/03 01/13/04 02/16/04 03/17/04 04/12/04 05/11/04 06/10/04 FIELD DATA mg/l: (GPS)Temperature (C) as of st298 8 8 8 8 9 10 10 pH (Std. Units) 7.5 8.6 7.8 7.3 7.4 7.8 7.1 Cond. (umho/cm) 640 640 640 600 660 900 860 TDS MAJOR IONS mg/I: Alk-CaCO3 87 68 Bicarbonate (HCO3) 106 83 Calcium (Ca) 99.3 65.31 Carbonate (C03) 1 Chloride (Cl) 9.3 15 Fluoride (F) 0.2 0.2 Ma nesiu (Mg)8 6.9 Nitrate-N (NO3) -0.1 0.14 Potassium (K) 13.7 15A Silica (SiO2) 13.1 10.8 Sodium (Na) 49.1 65.5 Sulfate (SO4) 275 252 NON-METALS:

Cyanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

Con (umho/cm) 736 738 pH GPS (6.8) 8.06 8.16 TDS 180- C. GPS (500) 493 491 METALS-DISSOLVED mq'i: Aluminum (Al) -0.1 -0.1 Arsenic (As) GCFS (.05) 40.001 0.001 Barium (Ba) -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) 0.01 0.02 Cobalt (Co) -0.001 -0.001 Copper (Cu) -0.01 -0.01 Iron (Fe) -0.05 -0.05 Lead (Pb) -0.01 -0.01 Manganese (Mn) 0.03 0.01 Meruy g)-0.0002 0.001 Molybdenum (Mo) -0.01 -0.01 Nickel (Ni) GPS (.01) -0.01 -0.01 Selenium (Se) GPS (.01) 0.002 -0.001 Silver (Ag)-0.01

-0.01 Thallium (T)-0.01 -0.01 Vanadium (V205) -0.1 -0.1 Zinc (ZN) -0.01 0.01 RADIOMETRIC pCIII: Uranium, natural GPS (36) 9.9 32.5 Radium 226 0.9 1.6 Radium Precision

+1 0.3 0.5 Radium 228 1 Radium Precision

-Combined Ra226/228 GF'S (5.8)- 0.9 1.6 Thorium 230 GPS (7.0) -0.2 -0.2 Thorium Precision

+1-Lead (Pb210) GPS (8.9)- -2.7 -2.7 Lead Precision

+/-Gross Alpha GPS 15 1.5 -1 Gross Alpha Precision

-1 ORGANICS: Diesel Ra Organ s (DRO ) ( 3.8 ND ND ND 1.3 ND ND ND ND Gasoline Range Organics (GRO) (MA) ND ND ND ND ND ND ND m+p-Xylenes (ugjlL ND 1.2 ND ND ND ND ND ND ND Methyl ethyl ketone WI) 26 ND ND ND ND ND ND ND ND Naphthalene 0910 3.5 ND ND ND ND ND ND ND ND Touene(ug/L)

ND 1A ND ND ND ND ND ND ND QUALITY ASSURANCE DATA: I TDS A/C Balance (dec. %) 0.98 1.06 (LAB: Energy Labs Inc. unless noted.) I KENNECOTT URANIUM COMPANY TMW-93 NORTHING:

148,399.92 Groundwater EASTING: 324,099.96 Protection le ND = Non-detectable Standard 1/19/2004 02/16/04 FIELD DATA mgII (GPS)Temperature (C) 'as of 5/28/98 8 8 H (Std. Units) 9.3 8.4 Cond. (umholcm) 700 400 TDS MAJOR IONS mg/I: Alk-CaCO3 69 Bicarbonate (HCO3) 84.2 Calcium (Ca) 73.6 Carbonate (C03) -1 Chloride (Cl) 23.2 Fluoride (F) 0.3 Magnesium (Mg) 7.6 Nitrate-N (NO3) -0.1 Potassium (K) 7.7 Silica (SiO2) 11 Sodium (Na) 84.1 Sulfate (S04) 325 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 798 pH GPS (6.8) 827 TDS @ 180° C. GPS (500) 537 METALS-DISSOLVED mg/l: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.006 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) 0.02 Mercury (Hg) 0.0015 Molybdenum (Mo) 0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) 0.004 Silver (Ag) -0.01 Thallium (Tl) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pcinl: Uranium, natural GPS (36)- 38.8 Radium 226 1.6 Radium Precision

+/- 0.5 Radium 228 -1 Radium Precision

+/-Combined Ra226/228 GPS (5.8)* 1.6 Thorium 230 GPS (7.0)- -0.2 Thorium Precision

+/-Lead (Pb2l0) GPS (8.9)- -1 Lead Precision

/-Gross Alpha GPS 15- 2.5 Gross Alpha Precision

+I- 1 ORGANICS: Diesel Range Organics (DRO) (mgJL) ND ND Gasoline Range Organics (GRO) (mg/L) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 0.95 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-94 NORTHING:

148,400.13 Groundwater EASTING: 324,000.02 Protection ,p ND = Non-detectable Standard 1/14/2004 02/16104 FIELD DATA mg/l: (GPS)Temperature (C) *as of 5/28/98 8 8 pH (Std. Units) 8.5 8 Cond. (umholcm) 960 520 TDS MAJOR IONS mg/l: Alk-CaCO3 98 Bicarbonate (HCO3) 120 Calcium (Ca) 132 Carbonate (C03) -1 Chloride (CI) 17.6 Fluoride (F) 0.2 Magnesium (Mg) 102 Nitrate-N (NO3) -0.1 Potassium (K) 5.8 Silica (SiO2) 10.2 Sodium (Na) 85.9 Suffate (S04) 444 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 789 pH GPS (6.8) 8.09 TDS @ 180° C. GPS (500) 774 METALS-DISSOLVED mg/l: Auminum (Al) -0.1 Arsenic (As) GPS (.05) 0.006 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) 0.003 Copper (Cu) -0.01 Iron (Fe) 0.052 Lead (Pb) -0.01 Manganese (Mn) 0.07 Mercury (Hg) 0.0019 Molybdenum (Mo) 0.02 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) -0.001 Silver (Ag) -0.01 Thallium (TI) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCUI: Uranium, natural GPS (36)- 27.8 Radium 226 1 Radium Precision

+/- 0.7 Radium 228 -1 Radium Precision i-Combined Ra226/228 GPS (5.8)- 1 Thorium 230 GPS (7.0)- -0.2 Thorium Precision

+/-Lead (Pb2l0) GPS (8.9)- -2.7 Lead Precision

+/-Gross Alpha GPS 15' 7 Gross Alpha Precision

+I- 1 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND ND Gasoline Range Organics (GRO) (mg1L) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.02 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-95 NORTHING:

148,399.94 Groundwater EASTING: 323,900.08 Protection , _ __ND = Non-detectable Standard 1114/2004 02116/04 FIELD DATA mg/l: (GPS)Temperature (C) 'as of 5/28198 8 8 pH (Std. Units) 8.8 8 Cond. (umholcm) 760 580 TDS MAJOR IONS mgI: Alk-CaCO3 149 Bicarbonate (HCO3) 182 Calcium (Ca) 99.4 Carbonate (C03) -1 Chloride (Ci) 10.1 Fluoride (F) 02 Magnesium (Mg) 7.1 Nitrate-N (NO3) 0.14 Potassium (K) 5.3 Silica (SiO2) 15.2 Sodium (Na) 59.7 Sulfate (S04) 278 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 1080 pH GPS (6.8) 8.09 TDS Q 180° C. GPS (500) 552 METALS-DISSOLVED mgII: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.001 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) 0.056 Lead (Pb) -0.01 Manganese (Mn) 0.04 Mercury (Hg) 0.0008 Molybdenum (Mo) -0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) -0.001 Silver (Ag) -0.01 Thallium (TI) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCiI: Uranium, natural GPS (36)- 6 Radium 226 1A Radium Precision

+/- 0.5 Radium 228 3.9 Radium Precision

+I- 12 Combined Ra226I228 GPS (5.8)' 5.3 Thorium 230 GPS (7.0)* -02 Thorium Precision

+I-Lead (Pb210) GPS (8.9)- -2.7 Lead Precision

+/-Gross Alpha GPS15- 1.5 Gross Alpha Precision 41- 1 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND ND Gasoline Range Organics (GRO) (mg/L) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.01 (LAB: Energy Labs Inc. unless noted.)

C ININ.e UI ...n.U .... I I i I I lMNr~rLU I I UMANIUM U;UMVANT F---I I TMW-96 NORTHING:

148,500.01 Groundwater EASTING: 323,807.75 Protection

_ _ _ND Non-detectable Standard 332004 04/13/04 05/11/04 06/10/04 FIELD DATA mgn: (GPS)Temperature (C) as of 5/28/98 8 10 12 10 pH (Std. Units) 7.e 6.6 7.5 6.8 Cond. (umho/cm) 13860 1440 1800 1400 TDS MAJOR IONS mgii: Alk-CaCO3 144 Bicarbonate (HCO3) 176 Calcium (Ca) 374 Carbonate (C03) -1 Chloride (Cl) 95 Fluoride (F) 0.1 Magnesium (Mg) 65.4 Nitrate-N (NO3) 1.77 Potassiurm; (K) 5.4 Silica (SiO2) 8.2 Sodium (Na) 103 Sulfate (S04) 1060 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umhofcm) 2330 pH GPS (6.8) 7.68 TDS @ 180, C. GPS (500) 1910 METALS-DISSOLVED mg/l: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.002 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) 0.007 Copper (Cu) -0.01 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) 0.14 Mercury (Hg) _ -0.0002 MoWbdenum (Mo) -0.01 Nickel (Ni) GPS (.01) 0.01 Selenium (Se) GPS (.01) 0.034 Silver Ag) -0.01 Thallium (To -0.01 _ _ _Vanadium tV205) -0.1 Zinc (ZN) 0.01 RADIOMETRIC pCli: Uranium, natural GPS (36) 572 Radium 226 5.5 Radium Precision

+/- 0.8 Radium 228 -1 Radum Precision+/

Combined Ra226/228 GPS (5.8), 5.5 orium 230 GPS (7.0o) -0.2 Thorium Precision+1 Lead (Pb210) GPS (8.9) -1_Lead Precision

+/-Gross Alpha GPS 15 8.1 Gross Alpha Precision

./- 1.3 ORGANICS: Diesel Range Organics (DRO) (m91) ND ND ND ND Gasoline Range Organics (GRO) _Mg/) ND ND ND 1.1.1-Trichloroethane ug/L 6 14 15 4.6 1,1-Dichloroethane ugrL ND 2.2 2.1 1.1 1,1-Dichloroethene ugtL ND 1 1.1 ND QUAUTY ASSURANCE DATA: TDS A/C Balance (dec. %) _ _ 1.07 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-97 NORTHING:

148,599.86 Groundwater EASTING: 323,799.93 Protection n°ND = Non-detectable Standard 313/004 FIELD DATA mglI: (GPS) _Temperature (C) as of 5/8198 8 pH (Std. Units) 11.7 Cond. (umholcm) 660 TDS MAJOR IONS mglI: Alk-CaCO3 50.7 Bicarbonate (HCO3) 3.3 Calcium (Ca) 65.6 Carbonate (C03) 35.1 Chloride (Cl) 102 Fluoride (F) 0.2 nesium (Mg) 7.4 _Nitrate-N (NO3) 2.42 Potassium (K) 27 Silica (SiO2) 7.4 Sodium (Na) 62.4 Sulfate (S04) 246 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 848 pH GPS (6.8) 11.3 TDS @ 180- C. GPS (500) 470 METALS-DISSOLVED mg/l: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.002 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) 0.06 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) -0.01 Mercury (Hg) 0.0006 Molybdenum (Mo) 0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) 0.055 Silver -0.01 Thallium (TI) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCVI: Uranium, natural GPS (36) 66.3 Radium 226 0.9 Radium Precision

+t- 0.4 Radium 228 -1 Radium Precision 41-Combined Ra226/228 GPS (5.8) 0.9s Thorium 230 GPS (7.0) -0.2 Thorium Precision

+-Lead (Pb210) GPS (8.9)- 37 Lead Precision

+1- 5.7 Gross Alpha GPS 15 1.1 Gross Alpha Precision

+I- 1 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND Gasoline Range Organics (GRO) (mgIL) ND QUALITY ASSURANCE DATA: TDS AIC Balance (dec. %) 1.02 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-98 NORTHING:

148699.84 EASTING: Groundwater 323810.19 Protection q ND = Non-detectable Standard 2/23/2004 FIELD DATA mgii: (GPS)Ternerature (C) 'as of 5/28/98 8 pH (Std. Units) 7.9 Cond. (umho/cm) 560 TDS____MAJOR IONS mg/I: Alk-CaCO3 108 Bicarbonate (HCO3) 132 Calcium (Ca) 189 Carbonate (C03) -1 Chloride (Cl) 36 Fluoride (F) 0.2 Magnesium (Mg) 16.2 Nitrate-N (NO3) -0.1 Potassium (K) 4.9 Silica (SiO2) 10.7 Sodium (Na) 56.3 Sulfate (So4) 508 NON-METALS:

_ ____Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 1220 pHGPS (6.8) 7.8 TDS _ 180° C. GPS (500) 905 METALS-DISSOLVED mgnI: luminum (Al) -0.1 Arsenic (As) GPS (.05) 0.002 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) 0.002 Copper (Cu) -0.01 ron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) 0.11 Mercury (Hg) -0.0002 Molybdenum (Mo) -0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) 0.003 Silver (Ag) -0.01 Thallium (Tl) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCin-Uranium, natural GPS (36)^ 118 Radium 226 2.6 Radium Precision

+I- 0.5 Radium 228 -1 Radium Precision

+t-Combined Ra226/228 GPS (5.8)' 2.6 Thorium 230 GPS (7.0)^ -0.2 Thorium Precision

+/-Lead (Pb2l0) GPS (8.9)' -1 Lead Precision

+I-Gross Alpha GPS 15' 2.9 Gross AJpha Precision

!- 1.2 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND Gasoline Range Organics (GRO) (mg/) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.03 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-99 _NORTHING:

148707.32 EASTING: Groundwater 323898.85 Protection

'fe ND = Non-detectable Standard 2n23n2004 FIELD DATA mgIl: (GPS)Temperature (C) *as of 5/28198 8 pH (Std. Units) 7.5 Cond. (umholcm) 960 TDS MAJOR IONS ngil: Alk-CaC3111 Bicarbonate (HCO3) 135 Calcium (Ca) 230 Carbonate (C03) -1 Chloride (Cl) 17.6 Fluoride (F) 0.2 Manesium (Mg) 27.7 Nitrate-N (N03) 0.1 Potassium (K) 10.2 Silica (SiO2) 9.9 Sodium (Na) 78.6 Sulfate (S04) 732 NON-METALS:

Cyanide (CN) 4.005 PHYSICAL PROPERTIES:

Cond (umholcm) 1580 pH GPS (6.8) 7.55 TDS @ 180' C. GPS (500) 1190 METALS-DISSOLVED mgIl: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) -0.001 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) 0.024 Copper (Cu) -0.01 Iron (Fe) 1.43 Lead (Pb) .-001 Manganese (Mn) 0.38 Mercury (Hg) -0.0002 Molybdenum (Mo) -0.01 Nickel (Ni) GPS (.01) 0.04 Selenium (Se) GPS (.01) 0.001 Silver ) -0.01 Thallium (Tl) -0.01 Vanadium (V205) -0.1 Zinc (ZN) 0.01 RADIOMETRIC pCUIl: Uranium, natural GPS (36)- 138 Radium 226 3.8 Radium Precision

+/- 0.6 Radium 228 -1 Radium Precision

+I-Combined Ra226r228 GPS (5.8)- 3.8 Thorium 230 GPS (7.0) -0.2 Thorium Precision

+/-Lead (Pb210) GPS (8.9)- -1 Lead Precision

+I-Gross Alpha GPS 15- 6.1 Gross Alpha Precision 4/ 1.4 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND Gasoline RangefOranics (GRO) (mgL) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.03 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-100 NORTHING:

148799.77 EASTING: Groundwater 324004.42 Protection ND = Non-detectable Standard 02117/04 FIELD DATA mgI: (GPS)Temperature (C) 'as of 5128/98 8 pH (Std. Units) 7.8 Cond. (umholcm) 400 TDS__ _ _ _MAJOR IONS mg/I: Alk-CaCO3 19.8 Bicarbonate (HCO3) 21.5 Calcium (Ca) 45.1 Carbonate (C03) 1.6 Chloride (CI) -_ 6.4 Fluoride (F) 0.2 Magnesium (Mg) 4.9 Nitrate-N (NO3) -0.1 Potassium (K) 4.2 Silica (SiO2) 10.9 Sodium (Na) 47.2 Sulfate (S04) 197 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 520 pH GPS (6.8) 9.12 TDS @ 180° C. GPS (500) 313 METALS-DISSOLVED mglI: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.002 Barium (Ba) _ -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) -0.01 Mercuryjflg)

__0.0015 Molybdenum (Mo) 0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) 0.002 Silver (Ag) -0.01 Thallium (TI) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCifl: Uranium, natural GPS (36)- 19.2 Radium 226 -0.2 Radium Precision 4_ _Radium 228 _ -1 Radium Precision 4)-Combined Ra226/228 GPS (5.8)' 0 Thorium 230 GPS (7.0)- -0.2 Thorium Precision 4/-Lead (Pb2l0) GPS (8.9)- -1 Lead Precision

+/-Gross Alpha GPS 15 -1 Gross Alpha Precision

+/-ORGANICS: Diesel Range Organics (DRO) (mglL) ND Gasoline Range Organics (GRO) (mg/,-) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 0.99 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-101 NORTHING:

148,800.10 Groundwater EASTING: 324,100.06 Protection

'ND = Non-detectable Standard 02/17/04 FIELD DATA mg/: (GPS)Temperature (C) 'as of 5/28/98 8 pH (Std. Units) 9.8 Cond. (umho/cm) 640 TDS MAJOR IONS mgIl: Alk-CaCO3 20.2 Bicarbonate (HCO3) 17.1 Calcium (Ca) 73.9 Carbonate (CO3) 4.5 Chloride (Cl) 9.4 Fluoride (F) 0.5 Magnesium (Mg) 2.5 Nitrate-N (NO3) -0.1 Potassium (K) 7 Silica (SiO2) 20.3 Sodium (Na) 93.7 Sulfate (S04) 355 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 820 pH GPS (6.8) 9.67 TDS@ 180 C. GPS (500) 533 METALS-DISSOLVED m n: Aluminum (Al) -0.1 Arsenic (As) GPS (.05) 0.007 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005.Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) -0.01 Mercwry (Hg) 0.004 Molybdenum (Mo) 0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) 0.006 Silver (Ag) -0.01 Thallium (TI) -0.01.Vanadium (V205) -0.1 inc (ZN) -0.01 RADIOMETRIC pCIl: Uranium, natural GPS (36) 27.1 Radium 226 0.8 Radium Precision

+/- 0.5 Radium 228 -1 Radium Precision

+1-Combined Ra226/228 GPS (5.8)- 0.8 Thorium 230 GPS (7.0)- -0.2 Thorium Precision

+/-Lead (Pb210) GPS (8.9)' _ 1 Lead Precision

+1-Gross Alpha GPS 15' -1 Gross Alpha Precision

+/-ORGANICS: Diesel Range Organics (DRO) (mg/L) ND Gasoline Ranganics (GRO) rg/L) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 0.96 (LAB: EneMy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-102 NORTHING:

148,600.02 Groundwater EASTING: 323,968.63 Protection ND = Non-detectable Standard 12/10/03 12/16103 01/14104 02/16/04 03/17/04 04/13/04 05/11/04 06/15/04 FIELD DATA mgn: (GPS)Temperature (C) asof5128198 8 8 8 8 10 11 12 pH (Std. Units) 11.7 13.3 13.4 12.8 12.7 12.5 13.2 Cond. (umho/cm) 3800 5800 4400 4600 3400 3400 5200 TDS MAJOR IONS mgni: _ _Alk-CaCO3 1080 1900 Bicarbonate (HCO3) 2.4 7.8 Calcium (Ca) 470 758 Carbonate (C03) 212 1380 Chloride (CI) 5.1 6.4 Fluoride (F) 0.2 0.2 MagnesiumMg) 1 Nitrate-N (NO3) -0.1 -0.1 Potassium (K) 95.5 217 Silica (SiO2) 3.9 -1 Sodium (Na) 63.5 111 .-Sulfate (S04) 407 370 NON-METALS:

Cyanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 5420 8780 pH GPS (6.8) 12.2 12.5 TDS a 1800 C. GPS (500) 1640 2530 METALS-DISSOLVED mgn: Aluminum (Ai) -0.1 -0.1 Arsenic (As) GPS (.05) -0.001 -0.001 Barium (Ba) 0.2 0.3 Beryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) GPS (.05) 0.09 0.21 Cobalt (Co) -0.001 0.001 Copper(Cu)

-0.01 -0.01 Iron (Fe) -0.05 -0.05 Lead (Pb) 0.02 0.16 Manganese (Mn) -0.01 -0.01 Mercury (Hg) -0.0002 -0.0002 Molybdenum (Mo) 0.03 0.04 Nickel (Ni) GPS (.01) -0.01 -0.01 Selenium (Se) GPS (.01) 0.003 0.007 Silver (Ag) -0.01 -0.01 Thallium (TI) -0.01 -0.01 Vanadium (V205) -0.1 -0.1 Zinc (ZN) -0.01 -0.01 RADIOMETRJC pClV: Uranium, natural GPS (36)- -0.2 -0.2 Radium 226 3.5 2.4 i Radium Precision

+1- 0.6 0.9 Radium 228 -1 3.6 Radium Precision

+I- 2 Combined Ra226/228 GPS (5.8)- 3.5 6 Thorium 230 GPS (7.0)- -0.2 0.2 Thorium Precision

+/- .0.3 Lead (Pb2l0) GPS (8.9)- -2.7 -2.7 Lead Precision

+/-Gross Alpha GPS 15- 3.6 2.2 Gross Alpha Precision 4/- 1.1 ORGANICS: Diesel Range Organics (DRO) (mgIL) 1.5 1.3 1.6 27 20 32 24 ND Gasoline Range Oganics (GRO) Lrg/J ND ND 0.041 0.088 0.099 ND 1,1,1-Trichloroethane (ugL) ND ND ND ND 1 1.1 1.3 ND Methyl ethyl ketone LugtL ND ND ND 24 37 38 41 ND Naphthalene (ug/L) 3 12 16 21 12 16 20 1.1 Toluene (ug/L) ND ND ND ND ND ND ND 5.4 QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 0.97 0.971 (LAB: Energy Labs Inc. unless noted.) I I KENNECOTT URANIUM COMPANY------TMW-I04 NORTHING:

148,508.55 Groundwater EASTING: 324,122.60 Protection ,o ND = Non-detectable Standard 3/3/04 FIELD DATA mA_:(GPS)Temperature (C) *as of 5128/98 8 pH (Std. Units) 8.9 Cond. (umholcm) 380 TDS MAJOR IONS mg/I: Alk-CaCO3 90.2 Bicarbonate (HCO3) 107 Calcium (Ca) 39.9 Carbonate (C03) 1.9 Chloride (CI) 4.2 Fluoride (F) 0.2 Magnesium (Mg) 4.3 Nitrate-N (NO3) 0.27 Potassium (K) 3.5 Silica (SiO2) 9.4 Sodium (Na) 54 Sulfate (S04) 131 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 490 pH GPS (6.8) 8.49 TDS Q180 C. GPS (500) 306 METALS-DISSOLVED mg/I: Aluminum (Al) 0.1 Arsenic (As) GPS (.05) 0.005 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) -0.01 Cobalt (Co) -0.001 Copper (Cu) -0.01 Iron (Fe) 0.135 Lead (Pb) -0.01 Manganese (Mn) 0.01 Mercury (Hg) 0.0004 Molybdenum (Mo) -0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) -0.001 Silver (Ag)-0.01 Thallium (TI) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCin: Uranium, natural GPS (36)- 57.1 Radium 226 -0.2 Radium Precision

+1-Radium 228 -1 Radium Precision 4/-Combined Ra226/228 GPS (5.8)- 0 Thorium 230 GPS (7.0)- 0.2 Thorium Precision

+/- 0.2 Lead (Pb2l0) GPS (8.9)' -1 Lead Precision

+1-Gross Alpha GPS 15- -1 Gross Alpha Precision 4/-ORGANICS: Diesel Range Oganics (DRO) (atL) ND Gasoline Range Organics (GRO) (mg/L) ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.04 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-105 NORTHING:

148,581.02 Groundwater EASTING: 323,943.82 Protection

' f ND = Non-detectable Standard 12V30103 1119/04 2/11104 3/23104 4/12/04 5/11/04 6115/04 FIELD DATA mgl: (GPS)Temperature (C) 'as of 5/28/98 8 8 6 19 21 28 pH (Std. Units) 6.8 5 5.11 3.6 3.9 3.5 Cond. (umholcm) 800 1420 1100 1120 1380 1400 TDS MAJOR IONS mglI: Alk-CaCO3 39.5 1.6 Bicarbonate (HCO3) 48.2 1.9 Calcium (Ca 168 303 Carbonate (C03) 1 Chloride (Cl) 23 67.3 Fluoride (F) 0.2 0.4 Magnesium (Mg) 24.8 51.4 Nitrate-N (NO3) -0.1 -0.1 Potassium (K) 5.8 6.5 Silica (SiO2) 28 53.11 Sodium (Na) 60.5 73 Sulfate (S04) 637 1160 NON-METALS:

Cyanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

_ _Cond (umholam) 1300 2180 pH GPS (6.8) 6.54 _ 4.71 TD@ 180 C. GPS (500) 964 1880 METALS-DISSOLVED mgn: minum (Al) -0.1 2.4 enic (As) GPS (.05) -0.001 -0.001 Barium (Baj -0.1 -0.1 ryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 0.16 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) GPS (.05) -0.01 -0.01 Cobalt (Co) 0.067 0.136 Copper (Cu) _ -0.01 0.01 Iron (Fe) 9.41 50.5 Lead (Pb) -0.01 0.04 Manganese (Mn) 1.09 2.26 MerwryJBg)

-0.0002 -0.0002 Moybdenum (Mo) _ -0.01 -0.01 Nickel (Ni) GPS (.01) 0.08 0.13 Selenium (Se) GPS (.01) 0.01 0.013 Sir(A) -0.01 -0.01 Thallium (TI) -0.01 -0.01 Vanadium (V205) -0.1 -0.11 Zinc (ZN) 0.17 0.43 RADIOMETRtC pCUI: Uranium, natural GPS (36)- 228 858 Radium 226 18.7 10.7 Radium Precision

+I- 1.5 1.1 Radium 228 3.7 25.8 Radium Precision

+I- 1.5 2.4 Combined Ra226/228 GPS (5.8)- 22.4 36.5 Thorium 230 GPS (7.0)' -0.2 -0.2 Thorium Precision

+I-Lead (Pb210) GPS (8.9)' 1 Lead Precision

+I-Gross Alpha GPS 15- 19.1 22.4 _Gross Alpha Precision

+I- 1.4 1.3 ORGANICS: Diesel Range Organics (DRO) (mg/L) 22 25 290 20 15 220 14 Gasoline Range Organics (GRO) (mgL) ND 0.073 0.134 0.125 0.083 0.092 1,1,1-Trichloroethane uglL) 13 20 ND ND ND ND 1,1-Dichloroethene (ual) ND 2.6 ND ND ND ND 1.2,4-Trmethylbenzene i ND 6.2 ND ND ND ND Methyl ethy ketone (uglL) ND ND ND 250 ND ND 25 Naphthalene ND 120 48 41 54 23 QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.02 1.13 (LAB: Energy Labs Inc. unless note.)

KENNECOTT URANIUM COMPANY TMW-111 NORTHING:

148,800.06 Groundwater EASTING: 324,200.03 Protection

,____ND = Non-detectable Standard 2/2/2004 02/11/04 FIELD DATA mglI: (GPS)Temperature (C) 'as of 5/28198 8 8 pH (Std. Units) 12.2 11.3 Cond. (umholcrn) 1400 820 TDS MAJOR IONS ming: Alk-CaCO3 1641 Bicarbonate (HCO3) .18.5 Calcium (Ca) 69.1 Carbonate (C03) 109 Chloride (CI) 7.1 _Fluoride (F) 0.3 Magnesium (Mg) -1 Nitrate-N (NO3) -0.11 Potassium (K) 24.5 _Silica (SiO2) 15.1 Sodium (Na) 55.5 Sulfate (S04) 95.1 NON-METALS:

Cyanide (CN) -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 1100 pH GPS (6.8) 11 TDS ( 180° C. GPS (500) 364 METALS-DISSOLVED mg/l: .Aluminum (Al) 0.1 Arsenic (As) GPS (.05) 0.004 Barium (Ba) -0.1 Beryllium (Be) GPS (.01) -0.01 Boron (B) -0.1 Cadmium (Cd) GPS (.01) -0.005 Chromium (Cr) GPS (.05) 0.01 Cobalt (Co) -0.001 Copper (Cu) -0.011 Iron (Fe) -0.05 Lead (Pb) -0.01 Manganese (Mn) -0.01 Mercury () 0.0018 Molybdenum (Mo) 0.01 Nickel (Ni) GPS (.01) -0.01 Selenium (Se) GPS (.01) -0.0011 Silver (A g) -0.01 Thallium (Tl) -0.01 Vanadium (V205) -0.1 Zinc (ZN) -0.01 RADIOMETRIC pCIn: Uranium, natural GPS (36)' -0.2 Radium 226 0.6 Radium Precision

+I- 0.3 Radium 228 -1 Radium Precision

+/-Combined Ra2261228 GPS (5.8)' 0.6 Thorium 230 GPS (7.0)- -0.2 Thorium Precision

/I-Lead (Pb210) GPS (8.9) -1 _Lead Precision

+I-Gross Alpha GPS 15' 1.6 Gross Alpha Precision

+/- 1 ORGANICS: Diesel Range Organics (DRO) (mgIL) ND ND Gasoline Range Organics (GRO) (mg/L)QUALITY ASSURANCE DATA: TDS NIC Balance (dec. %) 1.04 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-112 NORTHING:

148,700.09 Groundwater EASTING: 324,199.95 Protection c_ND = Non-detectable Standard 2/2/2004 02i17104 03/17/04 04/12/04 05/11/04 06110/04 FIELD DATA mgl: (GPS)Temperature (C) *as of 5128/98 8 8 8 10 10 12 pH (Std. Units) 8.4 6.1 5.8 5.8 6.8 6.7 Cond. (umholcm) 1000 1400 1800 1200 1200 1020 TDS MAJOR IONS mglI: Alk-CaCO3 88.8 37.5 Bicarbonate (HCO3) 108 45.86 Calcium (Ca) 153 396 Carbonate (C03) 1 Chloride (Cl) 11.4 37.5 Fluoride (F) 0.2 0.2 Magnesium (Mg) 20.2 47.5 Ndrate-N (NO3) -0.1 =_0.24 _Potassium (K) 6.1 7.9 Silica (SiO2) 10.3 14.1 Sodium (Na) 67.4 81.7 Sulfate (S04) 474 1160 NON-METALS:

Cyanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 1090 2280 pH GPS (6.8) 8.09 6.33 TDS @ 180- C. GPS (500) 771 2040 METALS-DISSOLVED mon: .Aluminum (Al) -0.1 -0.1 Arsenic (As) GPS (.05) -0.001 0.002 Barium (Ba) -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) GPS (.05) -0.01 -0.01 Cobalt (Co) 0.027 0.112 Copper (Cu) -0.01 -0.01 Iron (Fe) 0.164 10.2 Lead (Pb) -0.01 -0.01 Manganese (Mn) 0.33 0.71 _Mercury (Hg) 0.0004 -0.0002 Molybdenum (Mo) -0.01 -0.01 Nickel (Ni) GPS (.01) 0.05 0.15 Selenium (Se) GPS (.01) 0.003 0.003 Silver (Ag) -0.01 -0.01 Thallium (TI) -0.01 -0.01 Vanadium (V205) -0.1 -0.1 Zinc (ZN) 0.02 0.08 RADIOMETRIC pCUI: Uranium, natural GPS (36)- 82.6 25.1 Radium 226 1.91 5.7 Radium Precision

+I- 0.5 0.8 Radium 228 -1 19.8 Radium Precision

+I- 1.5 Combined Ra2261228 GPS (5.8) _ 1.9 25.5 _ _ _ _Thorium 230 GPS (7.0)- -0.2 -0.2 Thodurn Precision

+I-Lead (Pb2lO) GPS (8.9) 1 Lead Precision

+/-Gross Alpha GPS 15- 2.6 2.5 Gross Alpha Precision 4/- 1 1 ORGANICS: 1,1,1-Trichloroethane (u910 ND 2.3 1.9 2.3 ND ND Chloromethane (U91L) I ND ND Naphthalene (ugiL) ND ND ND ND 1.5 ND Diesel Range Organics (DRO) (mg&) ND ND ND ND ND ND Gasoline Range Organics (GRO) (mg/L) ND ND ND ND ND QUALITY ASSURANCE DATA: I TDS A/C Balance (dec. %) 0.98 1 1.16 (LAB: Energy Labs Inc. unless noted.) I IIA KENNECOTT URANIUM COMPANY TMW-113 NORTHING:

148,600.06 Groundwater EASTING: 324,199.95 Protection n., ND = Non-detectable Standard 1126104 2V17104 3/17/04 4112V04 5/11/04 6110/04 FIELD DATA mglI: (GPS)Temperature (C) 'as of 5128r98 8 8 8 10 10 14 pH (Std. Units) 12.3 11.4 10.8 10.9 8.9 7.2 Cond. (umholcmn) 2400 1140 1800 780 1000 1200 TDS MAJOR IONS mg/I: Alk-CaCO3 260 22.8 Bicarbonate (HCO3) 8 26.8 Calcium (Ca) 178 236 Carbonate (CO3) 104 -1 Chloride (Cl) 14.3 36.3 Fluoride (F) 0.4 0.2 Magnesium (Mg) -1 21.6 Nitrate-N (NO3) -0.1 -0.1 Potassium (K) 14.8 9.1 Silica (SiO2) 8.1 7.6 Sodium (Na) 83.7 90.7 Sulfate (S04) 391 752 NON-METALS:

Cvanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 1730 1560 pH GPS (6.8) 11.4 8.56 TDS @ 180- C. GPS (500) 804 1230 METALS-DISSOLVED m_ __: Aluminum (Al) -0.1 -0.1 Arsenic (As) GPS (.05) 0.001 0.006 Barium (Ba) -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) GPS (.05) -0.01 -0.01 Cobalt (Co) -0.001 -0.001 Copper (Cu) -0.01 -0.01 Iron (Fe) -0.051 -0.05 Lead (Pb) -0.01 -0.01 Manganese (Mn) -0.01 0.03 Mercuryv (H) 0.0007 0.0013 Molybdenum (Mo) 0.01 -0.01 Nickel (Ni) GPS (.01) -0.01 -0.01 Selenium (Se) GPS (.01) 0.009 0.003 Silver (Ag) -0.01 -0.01 Thallium (Tl) -0.01 -0.01 Vanadium (V205) -0.1 -0.1 Zinc (ZN) -0.01 -0.01 RADIOMETRIC pCI/I: Uranium, natural GPS (36)- 6.2 160 Radium 226 1.1 1.6 Radium Precision

+/- 0.4 0.6 Radium 228 -1 3.8 Radium Precision

+1.1 Combined Ra2261228 GPS (5.8)- 1.1 5.4 Thorium 230 GPS (7.0)- -0.2 -0.2 Thorium Precision

+I-Lead (Pb2l 0) GPS (8.9)1 1 Lead Precision

+/-Gross Alpha GPS 15- 1.6 9.6 Gross Alpha Precision

+I- 1 1.6 ORGANICS: Diesel Range Organics (DRO) (mQgL) ND ND ND ND ND ND Gasoline Range Organics (GRO) (mgIL) ND ND ND ND ND ND Naphthalene

(_g&) 2.2 1.8 1.4 ND ND ND QUAUTY ASSURANCE DATA: TDS A/C Balance (dec. %) 0.96 1.06 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-115 NORTHING:

148,499.96 Groundwater EASTING: 324,199.79 Protection npo ND = Non-detectable Standard 112112004 02117/04 04/12104 FIELD DATA m_ __: _____Temperature (C) 'as of 5/28198 8 8 11 pH (Std. Units) 12.5 12.3 12.1 Cond. (umholcm) 1100 1360 1280 TDS MAJOR IONS mg/I: Alk-CaCO3 113 266 Bicarbonate (HCO3) 13.5 6 Calcium (Ca) 129 187 Carbonate (C03) 74.5 191 Chloride (Ct) 9.7 8.9 Fluoride (F) 0.3 0.3 Hydroxide as OH 16.6 -1 Magnesium (Mg) 1.2 4-.1 Nitrate-N (NO3) -0.1 14.6 Potassium (K) 13.5 _ 14.6 Silica (SiO2) 15.1 8.8 Sodium (Na) 70.9 79.3 Sulfate (S04) 308 353 NON-METALS:

_ __Cyanide (CN) -0.005 -0.005 PHYSICAL PROPERTIES:

Cond (umholcm) 1290 1860 HH GPS (6.8) 11 11.8 TDS 180- C. GPS (500) 641 l 814 METALS-DISSOLVED mgn: Aluminum (Al) -0.1 -0.1 Arsenic (As) GPS (.05) 0.002 0.003 Barium (Ba) -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 Boron (B) -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 Chromium (Cr) GPS (.05) -0.01 -0.01 Cobalt (Co) _ -0.001 -0.001 Copper (Cu) -0.01 -0.01 Iron (Fe) -0.05 -0.05 Lead (Pb) -0.01 -0.01 Manganese (Mn) -0.01 -0.01 Mercury (Hg) 0.0011 l 0.006 Molybdenum (Mo) 0.02 0.02 Nickel (Ni) GPS (.01) -0.01 -0.01 Selenium (Se) GPS (.01) 0.007 0.002 Silver (Ag) -0.01 -0.01 Thallium (TI) -0.01 -0.01 Vanadium (V205) -0.1 -0.1 Zinc (ZN) -0.01 -0.01 RADIOMETRIC pCUI: Uranium, natural GPS (36)' -0.2 0.4 Radium 226 1 1 Radium Precision

+I- 0.4 0.5 Radium 228 1 Radium Precision

+I-Combined Ra2261228 GPS (5.8)- 1 1 Thorium 230 GPS (7.0) 0.2 Thorium Precision

+I-Lead (Pb210) GPS (8.9)' 1 Lead Precision

+/-Gross Alpha GPS 15- 3.1 -1 Gross Alpha Precision

+/- 1.1 ORGANICS: Diesel Range Organics (DRO) (mg/L) ND ND ND Gasoline Range Organics (GRO) (mg/L) ND ND ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) 1.07 1.01 (LAB: Energy Labs Inc. unless noted.)

KENNECOTT URANIUM COMPANY TMW-52 NORTHING:

148,316.56 Groundwater SSI, EASTING: 324,221.64 Protection IV __ND = Non-detectable Standard 317/02 914/02 3/5103 9/15/03 10122103 11/10/03 1/13104 3/11/04 FIELD DATA mgl: (GPS)Temperature (C) 'as of 5/28/98 8 8 8 8 8 8 8 8 pH (Std. Units) 7.2 7.2 6.8 6.8 6.9 6.6 8.3 7.2 Cond. (umholcm) 860 780 860 800 780 780 800 700 TDS MAJOR IONS mgli: AIk- CaCO3 155 150 156 150 153 154 Bicarbonate (HCO3) 188 183 190 183 187 188 Calcium (Ca) 187 156 154 161 206 172 Carbonate (C03) 1 1 1 Chloride (CI) 18.9 15.8 12.2 18.7 15.1 15.9 Fluoride (F) 0.1 0.2 0.2 0.2 0.1 0.2 Magneslum (Mg) 12.9 11A 10.8 11.1 14.4 12.7 Nitrate -N (NO3) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Potassium (K) 3.9 3.5 4.2 3.8 7.9 3.8 Silica (SiO2) 13.9 12.9 14.7 16.5 15.2 Sodium (Na) 50.9 47.7 46.4 45.7 54.8 53A Suffate (S04) 392 358 352 363 471 398 NON-METALS:

Cyanide (CN) -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 PHYSICAL PROPERTIES:

Cond. (umho/rm) 1020 967 1030 1080 1050 1060 pH GPS (6.8) 7.8 7.97 7.6 8.05 8.05 7.92 TDS @ 180 C. GPS (500) 753 730 744 739 754 786 METALS-DISSOLVED mg/ 1 Aluminum (Al) -0.1 -0.1 -0.1 0.1 -0.1 -0.1 Arsenic (As) GPS (.05) -0.001 -0.001 -0.001 -0.002 -0.002 -0.002 Barium (Ba) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Beryllium (Be) GPS (.01) -0.01 -0.01 -0.01 -0.01 I -0.01 -0.01 Boron (B) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Cadmium (Cd) GPS (.01) -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 Chromium (Cr) GPS (.05) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Cobalt (Co) -0.001 0.001 -0.001 -0.001 -0.001 -0.001 Copper (Cu) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Iron (Fe) 0.46 0.222 -0.05 0.411 0.459 0.409 Lead (Pb) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Manganese (Mn) 0.1 0.09 0.09 0.11 0.1 0.1 Mercury (H)) -0.0002 -0.0002 -0.0002 -0.0004 -0.0004 -0.0004 Molenum (Mo) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Nickel (Ni) GPS (.01) -0.01 0.01 -0.01 -0.01 -0.01 -0.01 Selenium (Se) GPS (.01) -0.001 -0.001 -0.001 -0.005 -0.005 -0.005 Silver (Agj )._ -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Thallium I ' -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Vanadium (V205) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Zinc (ZN) -0.01 0.01 -0.01 0.02 -0.01 -0.01 RADIOMETRIC pCUI: Uranium, natural GPS (36)- 5.2 5.8 4.8 4.8 6.3 6.2 Radium 226 2.3 2.1 2.5 1.8 3.7 2.1 Radium Precision

+/- _ 0.2 0.3 0.2 0.2 0.7 0.6 Radium 228 3 3.9 4.9 2.2 2.8 Radium Precision

+- 1 1 1 1 0.9 Combined Ra226/228 GPS (5.8)- 5.3 6 7.4 4 6.5 2.1 Thorium 230 GPS (7.0)- -0.2 -0.2 -0.2 -0.2 0.2 Thorium Precision

+/-Lead (Pb2l0) GPS (8.9)- -2.7 -2.7 -2.7 -2.7 -2.7 -1 Lead Precision

+/- I Gross Alpha GPS 15- 3.8 2 3.8 3 3.3 2.5 Gross Alpha Preision +/- 1.9 1.1 1 1 1.3 1 ORGANICS: Diesel Range Organics (mgl j _ _ = ND ND ND Gasoline Range Organics (mg _ _ ND ND ND 1,1,1-Trichloroethane (ug/l) ND ND ND Naphthalene (ugILL) 3.8 ND ND QUALITY ASSURANCE DATA: TDS A/C Balance (dec. %) l 0.96 1.04 1.08 0.88 1.05 (LAB: Energy Labs Inc. unless noted.) II KENNECOTT URANIUM COMPANY PWW-1 Ground EPA Water Drinking 2003 2004 ND = Non-detectable Protection Water 5/23102 7123102 10/8/02 1/8103 4m7o03 7/1/03 10/20/03 1/12104 4/6/04 FIELD DATA mg/l: Standard Standard Temperature (C) 8 8 8 8 8 8 8 11 pH (Std. Units) 7.5 7.5 6.9 7.2 6.9 7.3 8.6 7.4 Cond (umho/cm) 380 340 280 300 300 280 300 260 TDS I MAJOR IONS mg/l: AIk-CaC03 85 85 82 82 82 80 83 81.2 Bicarbonate (HCO3) 104 104 100 100 99.4 97 101 99 Calcium (Ca) 26.6 24 14.7 16.8 18.4 15.8 17 19.4 Carbonate (C03) 1 1 1 1 Chloride (CI) 3.8 7 4.4 3.7 2.6 -1 4.5 1.4 Fluoride (F) 4 0.2 0.2 0.2 0.2 0.2 0.2 0.2 0.2 Magnesium (Mg) 1.9 1.6 1 1.1 1 1.1 Nitrate-N (NO3) 10 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Potassium (K) 1.2 1.4 1.1 1.9 1.6 1.3 1.6 1.8 Silica (SiO2) 10 12.9 8.3 9.3 10.7 10.7 10.4 11 Sodium (Na) 45 44 38.1 44.1 43.9 43.8 43.5 39.8 Sulfate (S04) 81.8 72.5 43.4 55.2 60.7 58.7 49.7 52.5 NON-METALS:

Cyanide (CN) .005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 PHYSICAL PROPERTIES:

Cond (umho/cm) 358 334 282 285 306 298 295 283 pH (units) 6.8 6.5-8.5 8.1 8.2 7.98 7.88 8.23 8.09 8.13 8.19 TDS @180 500 247 217 165 204 193 167 182 147 TRACE METALS mgn: Aluminum (Al) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Arsenic (As) .05 .05 0.002 0.002 0.002 0.002 0.002 -0.002 0.001 0.002 Barium (Ba) 1 1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Beryllium (Be) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Boron (B) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Cadmium (Cd) .01 .01 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 Chromium (Cr) .05 .05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Cobalt (Co) -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 Copper (Cu) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Iron (Fe) 0.095 0.09 0.109 0.198 0.284 0.295 0.34 0.484 Lead (Pb) .5 .05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Manganese (Mn) 0.02 0.02 0.01 0.01 0.01 0.02 0.02 0.04 Mercury (Hg) .002 .002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 Molybdenum (Mo) .04 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Nickel (Ni) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Selenium (Se) .01 .01 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 Silver (Ag) .05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Thallium (TI) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Vanadium (V205) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Zinc (ZN) 0.04 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 RADIOMETRIC pcin/: Uranium, Natural 1.7 3385 12.1 6.5 2.9 1.1 2.6 0.8 2.1 0.4 Radium 226 0.6 +/- 0.2 0.4 +/- 0.2 -0.2 0.3 +/- 0.2 0.4 +/- 0.2 0.4 +/- 0.2 1.2 +/- 0.5 0.4+/-0.3 Radium 228 1 -1 7.3 +/-1.7 1 1 Comb. Ra226/228 2.8 5 0.6 0.4 0 7.6 0.4 0.4 1.2 0.4 Thorium 230 10 -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 Lead (Pb210) 1.4 -2.7 -2.7 -2.7 -2.7 -2.7 -2.7 -2.7 -1 Gross Alpha 6.6 15 -1 2.0 +/- 1.0 1 1 1 A/C Balance 1.09 1 1.02 1.11 1.01 0.99 1.09 0.89 ner~gy Labs, Inc. unless noted otherwise 7123102 10/8102 1/8103 4/7/03 7/1103 10120103 1/12/04 4/6104 Oil & Grease ND (1.0) ND (1.0) ND (1.0) ND (1.0) ND (1.0) ND (1.0) ND (1.0) ND (1.0)Volatile Organic Chemicals Gasoline Range Organici(mgrL)

NDI KENNECOTT URANIUM COMPANY IlI I I I I I XPWW-2 III __ I I I I i 'EPA DWS = EPA Drinking Water Standard 2003 2004ND = Non-detectable (GPS) EPA DWS 05/23102 07/23102 10/08/02 01/08103 04/07/03 07102103 10120/03 01/07104 04/06/04 FIELD DATA mg/Il: Temperature (C) 8 8 8 ump down 8 8 8 1 1 pH (Std. Units) 7.5 7.5 7.3 no power. 7.3 6.7 8.6 7.6 Cond (umholcm) 320 300 260 280 280 380 240 TDS MAJOR IONS mg/l: Alk-CaCO3 58 86 83 84 82 85 82.2 Bicarbonate (HCO3) 70.2 104 101 102 99.4 104 98 Calcium (Ca) 9 22.5 12.1 15 13.2 16 14.2 Carbonate (C03) 1 1 -1 1 1.4 Chloride (Cl) 2.2 7.7 2.3 6.6 -1 1.9 2.2 Fluoride (F) 4 0.1 0.2 0.2 0.2 0.2 0.2 0.2 Magnesium (Mg) -1 1.5 1 -1 1 -1 Nitrate-N (NO3) 10 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1lPotassium (K) -1 1.3 -1 1.3 1.3 1.1 1.5 Silica (SiO2) 8.2 12.3 8 10.4 10.5 11 10.3 Sodium (Na) 40.2 42.3 40.2 42.8 42 41 43.6 Sulfate (S04) 44.2 67 39.4 48.7 46.4 45 45.6 NON-METALS:

.Cyanide (CN) .005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 PHYSICAL PROPERTIES:

_Cond (umholcm) 192 319 272 280 274 273 269 pH (units) 6.8 6.5-8.5 7.83 8.27 8.06 8.26 8.16 8.14 8.39 TDS @180° 500 128 207 169 181 176 133 139 TRACE METALS mg/l: -Aluminum (Al) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Arsenic (As) .05 .05 0.002 0.002 0.002 0.002 -0.002 0.002 0.002 Barium (Ba) 1 1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Beryllium (Be) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Boron (B) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Cadmium (Cd) .01 .01 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 -0.005 Chromium (Cr) .05 .05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Cobalt (Co) -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 Copper (Cu) -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01, Iron (Fe) -0.05 0.081 0.118 0.141 0.329 0.24 0.302 Lead (Pb) .5 .05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Man anese (Mn) -0.01 0.02 0.02 0.02 0.02 0.02 0.02 Mercury (Hg) .002 .002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 -0.0002 Molybdenum (Mo) .04 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Nickel (Ni) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Selenium (Se) .01 .01 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 -0.001 Silver (A g) _.05 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Thallium (TI) .01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 -0.01 Vanadium (V205) -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 -0.1 Zinc (ZN) 0.03 -0.01 -0.011 -0.01 -0.01 -0.01 -0.01 RADIOMETRIC pCI/I: I Uranium, Natural 1.7 3385 3.5 4 2.7 2.6 2.1 2.2 2.2 Radium 226 -0.2 0.9 +I- 0.3 -0.2 -0.2 -0.2 0.6+/-0.4 0.6+/-0.3 Radium 228 1 -1 3.4 +/-1.8 1 10.7+/-1.2 Comb. Ra226/228 2.8 5 0 0.9 0 3.4 0 0.6 11.3 Thorium 230 10 -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 -0.2 Lead (Pb210) 1.4 -2.7 -2.7 -2.7 -2.7 -2.7 -2.7 -1 Gross Alpha 6.6 15 -1 1.4 +/-1.0 1 2.1+/-1.0 1.0+/-1.0

-1 A/C Balance 0.9 0.99 1.09 1.02 1.15 0.85 0.89 GPS = Groundwater Protection Standard 7/23102 10/8/02 1/8/03 7/9/03 10/20/03 1/7/04 4/6104 Oil & Grease ND(1.0) 1.1 ND (1.0) ND (1.0) ND (1.0) ND(1.0) ND (1.0)Volatile Organic Chemicals

_Gasoline Range Organics m9/L ND_

ENERGGYLABORArORIES, INC. -2393Sat Creek Highway(82601)

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Kennecott Uranium Company:-~ject: Sweetwater Uranium Lah ID: C02050327-001 Client Sample ID: Can PVC Primer*,- .-. .i I MAY 2 8- yJ2 Report Date: 05;23/ 27 'Collection Date: 05/09/02 13:50 Date Received:

05/10102 Matrix- -AQUEOUS AnaIh'scs Result Units M ('L/Qual RL QCL Method Analysis Date / By VOLATILE ORGANIC CHEMICALS 1.1.1.2-Tetrachloroethane 1.1. 1-Trichloroethane 1.1.2.2-Tetrachloroethane 1.1.2-Trichloroethane 1.1 -Dichloroethane 1,.1-Dichloroethene 1 .1-Dichloropropene 1.2.3-Tnchlorobenzene

.1 .2.3-Trichloropropane 1.2.4-Trichlorobenzene 1 2.4-rrimethylbenzene 1.2-Oibromo-3-chloropropane 1.2-Dibromoethane 1.2-Dichlorobenzene 1.2-Dichloroethane ODichloropropane Q!5-Trimethylbenzene 1.3-Oichlorobenzene 1.3-Dichloropropane 1.4-Oichlorobenzene 2.2-Oichloropropane 2-Chlorotoluene 4-Chlorotoluene Benzene Bromobenzene Bromochloromethane Bromodichloromethane Bromofomm Bromomethane Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane Chloroform Chloromethane ds-1,2-Dichloroethene ds-i .3-Dichloropropene Dibromomethane ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND* ND ND ND* ND ND ND ND ND ND ND ND ND-ND ND ND ND ND NO mg/kg mg/kg mg/kg mg/kg mg/kg mglkg mg/kg mg/kg mg.'kg mglkg mg/kg mg.'kg mglkg mg/kg mgA/g mg/kg mg/kg, mg/kg mg/kg mg/kg mg/kg mglkg mg/kg mg/kg mglkg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mglkg mg/kg.mg/kg mg/kg D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 SW8260B SW8260B SW8260B SW82608 SW82608 SW82608 SW8260B SW8260B SW8260B SW8260B SW82608 SW82608 SW8260B SW8260B SW112608 SW82608 SW82608 SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B SW8260B SW8260B SW8260B SW82608 SW82608 SW8260 SW8264 SWV8260B SW8260B 05/21/02 21:01/ rh 05/21/0221:01 rh 05/21/02 21:01 /rh 05/21102 21:01 /rh 05/21102 21:01 /rh 05121102 21:01 rh 05/21/02 21:01 / rh 05/21102 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 /rh 05/21/02 21:01 /rh 05/21/02 21:01/ rh 05/21/02 21:01/ rh 05/21/02 21:01/ rh 05/21/02 21:01 rh 05/21/02 21:01/ rh 05/21/02 21:01 rh 05/21102 21:01 rh 05121/02 21:01/ rh 05/21102 21:01 Irh 05/21/02 21:01 / rh 05/21/02 21:01 rh 05121/02 21:01 rh 05/21/02 21:01 /rh 05121/02 21:01 I rh 05/21/02 21:01 rh 05/21/02 21:011 rh 05/21/02 21:0 I/rh 05/21/02 21:01 / rh 05/21/0221:01

/rh 05/21102 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 / rh 05/21102 21:01 / rh 05/21102 21:01 / rh.:.Report-initinns: RL -Analyte reporting limit CCL -Quality control limit D -RL increased due to sample matrix interference.*

MCL -Maximum contaminant level.ND -Not detected at the reporting limit.TRACKII'G 110. PAGE NO.50327ROo00 I

_ ENERGYLABORA TORIES; INC 2393 Salt Creek Highway (82601J *PRO. Box 3258 -Casper, WY82602* To/lFree 88.2350515

307.2350515

Fax 307234.1639

-caspererenergy/ab com -wwwenergy/ab.com

1e.' r.LABORATORY ANALYTICAL REPORI'TC ient: Kennecott Uranium Company; Project: Sweetwater Uranium Lab ID: C02050327-001 Client Sample ID: Can PVC Primer lreport Date: Collectioin Date: Date Received: 05/23/02 05/09/02 13:50 05/10/02 ,Mlatrix:

AQUEOUS NICI1 Qual RL QC'I.Analyses Result Units MNIethod Analysis Date / By VOLATILE ORGANIC CHEMICALS Dichlorodifluoromethane ND Ethylbenzene ND Hexachlorobutadlene ND Isopropylbenzene ND m.p-Xylenes ND Methyl ethyl ketone 543000 E Methylene chloride ND Naphthalene ND n-Butylbenzene ND n-Propylbenzene ND o-Xylene ND p-isopropyltoluene ND sec-Butylbenzene ND Styrene ND tert-Butylbenzene ND Tetrachloroethene ND Toluene ND trans-1.2-Dichicroethene ND trans-1.3-Dichloropropene ND Trichloroethene ND Trichlorofluoromethane ND Vinyl chloride ND Surr 1,2-Dichlorobenzene-d4 78.0 Surr Dibromofluoromethane

-85.0 Surr p-Bromofluorobenzene 62.0 Surr Toluene-d8 62.0-Matrix interference resulted in low surrogate recoveries.

mg/kg mg/kg mgykg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg%REC%REC%REC%REC D D D D D D D D D D D D D D D D D D D D D D D D DS DS 200 200 200 200 200 16000 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 SW82608 SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B SW82608 SW82608 SW8260B SW8250B 05/21/02 21:01 / rh 05/21/02 21:01 I rh 05/21102 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 / rh 05/21/02 20:23 / rh 05/21/02 21:01 / rh 05/21102 21:01 / rh 05/21/02 21:01 / rh 05/21/02 21:01 /rh 05/21/02 21:01 / rh 05/21/02 21:01 /rh 05/21/02 21:01 / rh 05/21/02 21:01/ rh 05/21102 21:01/ rh 05/21/02 21:01/ rh 05121/02 21:01/ rh 05/21102 21:01/ rh 05/21/02 21:01 /rh 05/21102 21:01 /rh 05/21/02 21:01 / rh 05/21/02 21:01/ rh 05121/02 21:01 /rh 05121/02 21:01/ rh 05121/02 21:01/ rh 05/21/02 21:01/ rh 70-130 60-135 70-130 70-130 Report RL -Analyte reporting limit.D)effniloti.l:

QCL -Quality control limit D -RL increased due to sample matrix interference.

MCL -Maximum contaminant level.ND -Not detec:ed at the reporting limit. -S -Spike recovery outside of advisory limits.TRACKH ', G 110. PAGE NO.5932 7R0'002 ENERGYLABORA TORIES, INC. '2393 Salt Cmek ighway (682601) 'AC. Box 3256 Casper WY82602 Toll Free 888.235 0515 -307.235.0515

Fax 307.234.1639

' casper--eiergy/ab.com

wuw. energylab.com

§.1efrT7-Tr77rACW LABORATORY ANALYTICAL REPORT1;3b'lient:

Kennecott Uranium Company\.,ject: Sweetwater Uranium Lab ID: C02050327-002 Client Sample ID: ('an PVE Cement." ., t ," I.! , , Report Date: 05/23/02 4 Collection Date: 05/09/02 13:50 Date Received:

05/10/02*ilatrix:

AQUEOUS Analyses ,N1CL/Result Units: Qual RL QCL Mlethod Analysis Date / By VOLATILE ORGANIC CHEMICALS.

1.1.1.2-Tetrachloroethane 1.1.1 -Trichloroethane 1.1.2.2-Tetrachloroethane 1.1,2-Trichloroethane 1.1-Dichloroethane 1.1-Dichloroethene 1,.1-Dichloropropene 1.2.3-Tn chlorobenzene 1.2.3-Trichloropropane 1.2.4-Trichlorobenzene 1 .2.4-Trimethylbenzene 1 .2-Dibromo-3-chloropropane 1.2-Dibromoethane

.1 .2-Dlchlorobenzene 1.2-Dirhloroethane

- ichloropropane

<,5Trirrethylbenzene 1.3-Dichlorobenzene 1.3-Dichloropropane 1.4-Dichlorobenzene 2.2-Dichloropropane 2-Chlorotoluene 4-Chlorotoluene Benzene Eromobenzene Bromochloromethane Bromodichloromethane Bromoform Bromomethane Carbon tetrachloride Chlorobenzene Chlorodibromomethane Chloroethane Chloroform Chloromethane ds-1.2-Dichloroethene cis-1.3-Dichloropropene Dibromomethane ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND mg/kg mg/kg mg/kg mg/kg mg/kg mglkg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg D 200 D 200 D 200 D 200 D 200-D 200 D 200 D 200 D 200 D 200 D 200 0 200 D 200 0 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 D 200 SW8260B SW8260B SW8260B SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B SW8260B SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B.SW82608 1 SW8260B SW82608 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56/ rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21102 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21102 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 2256 / rh 05/21/02 2256 / rh 05/21/02 22:56 / rh 05/21/02 2256 / rh 05/21/02 2256 / rh 05/21/02 2256 / rh 05/21/02 22+/-56 / rh 0521/02 22:56 / rh 05/21/02 2256 / rh 05/21/02 2256 / rh O/1/02 22+/-561 rh 05/21/02 2256 / rh 05/21/02 2+/-56 / rh 05/21/02 2256 / rh Report k\ ,)RL -Analyte reporting limit.QCL -Quality control limit.D -RL increased due to sample matrix interference.

MCL -Maximum contaminant level.ND -Not detected at the reporting limit.TRACKI,.G NO. PAGE HO.ZO327ROnOO3 NERGYLABORA TORIES, INC. -2393 SaIl (62601) -P0. Box 3256 Caspei WY82602=r-=_zyENERG LABORAWORIES, INC. -2393Sa1Mvrek~ighwqyv(82601)

P-0 Sox3W -Casper, WY82602* TollFree 88.2350515

-3072350515

-Far 307234.1639 casperlenergyIab.com

-energy/ab.

com LABORATORY ANALYTICAL REPORT , Client: Kcirnecott Uranium Company Project: .Sveetwater Uranium Lab ID: (02050327-002 Client Sample ID: Can PVE Cement Rep(Collecti Date R)rt Date: 05/23/02 on Date: 05/09/02 13:50 received:

05/10/02 Matrix: AQUEOUS INICL/Analyses Result Units Qual RL QCL Mwlethod Analysis Date / By VOLATILE ORGANIC CHEMICALS Dichlorodifluorornethane ND Ethylbenzene ND Hexachlorobutadiene ND Isopropylbenzene ND m+p-Xylenes ND Methyl ethyl ketone 150000 Methylene chloride ND Naphthalene ND n-Butylberizene ND n-Propylbenzene ND o-Xylene ND p-lsopropylloluene ND sec-Butylbenzene ND Styrene ND tert-Butylbenzene ND Tetrachloroethene ND Toluene ND trans-1.2-Dichloroethene ND trans-1 3-Dichloropropene ND Trichloroethene ND Trichlorofluoromethane ND Vinyl chlonde ND Surr 1.2-Dichlorobenzene-d4 81.0 Surr Dibromofluoromethane 95.0 Sum p-Broinofluorobenzene 56.0 Surr Toluene-d8 65.0-Matrix interterence resulted in low surrogate recoveries.

mglkg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mglkg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg mg/kg%REC%REC%REC%REC D D D D D D D D D D D D D D D D D D D D D D D D DS DS 200 200 200 200 200 16000 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 200 SW82608 SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW8260B SW82608 SW8260B SW8260B SW82608 SW8260B SW8260B SW826063 SW8260B SW8260B SW8260B SW8260B SW826OB SW8260B SW8260B SW8260B SW8260B SW82608 05/21/02 22:56 I rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:19 / rh 05/21102 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56/ rh 05/21/02 22:56 / rh 05/21/02 2256/ rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05121/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:561 rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 22:56 / rh 05/21/02 2256I rh 05/21/02 22:56 rh 05/21/02 22:56/ rh 05/21/02 22:56/ rh 70-130 60-135 70-130 70-130.. Report RL -Analyte reporting limit.Deflni tilim : O(CL -Quality control limit.0 -RL increased due to sample matrix interference.

MCL -Maximum contaminant level.ND -Not detected at the reporting limit.S -Spike recovery outside of advisory limits.TRAC,;,', "O. PAGE NO.5: 1-1 570 t0 00 I-

-a' e*ff! 5ra~CHAIN OF CUSTODYRFIORD PLEASE PRINT OR TYPE ALL INFORMATION EXCEPT SIGNATURES Received Date: Cust. No.: ILgin Date: Custody Se7W(j Yes/No Shipped by: Intact: Yes/No Shipping Bill #: Signature Match?: Yes/No SampleTemp:

Z L I CC If no -Reason: For Lob use C BILLINCS, I .CASPER, WY CILLETTEWY IIEILENA.MT RAPIOCITYZSD P.O. Ok. 3(0116 49107b wls 5MOM7j4489 P.O. Box 32SII2602) wan, S-C215515 110SWes0FinS 1tS27l16) nkv J07-686-7175 PO. Bo&xS t.88159M)

Was 8774720711 P. lBox 2470t57709) muffs 88-672-1221 II0Stuth27th (59101 i n-k .06-252-032 2393 Sah Cwteighwy (82601) srke 307-235455 Faw 307682.4625 2704Bi11inpAx.I(5WI 1ArFa; 4L6-4020711 610FanooS(5701) nink 605.42-122S Fat 406252-69 Faw JOt-23J-16f9 r Faw EA54-Jfl1)197 PO./ r&cNamelAddress I 09 1c, j I VCCXV\AM XXI0 S///CoOc(N e PhOVj L,5 Sampir's lir JInvoct Lab No. DATE TIME UU*WV 2:5Ol-iv 3 ) 1 /For Lab Use Only Report to: Q n e 4:: 3 \ t V4 CO Co x ( ) / / /Comments, Special.b2u-oo 3 / / / / / / /Instructions, etc.._._ SAMPLEID.

J C_\_ =PWC c _ - I I I _ _ lt q\v_ _ oX .xVlt/)pc__ .____.__ .n ~S_____ 1' ! _ s.... "A d 70-.o II I. .)I .I.At-I::.r.)Vtt LeI R! i ngfleile I gnte) Dale-A _ _ __ I L Received by: (signature) 2.Relinquished (signature)

[Ra/ 1 me { ceivedr atoryby: v Energy Laboratories Inc.Sample Receipt Checklist V Client Name: KNNCTT-URNM Work Order Number C02050327 Checklist completed by -~ 4 { / /0 Date and Time Received: Received by: sh 05/10/2002 10:00:00 Reviewed by Inwats Date Carrier name: UPS Shipping container/cooler in good condition?

Custody seals intact on shipping container/cooler?

Custody seals intact on sample bottles?Chain of custody present?Chain of custody signed when relinquished and received?Chain of custody agrees with sample labels?Samples In proper container/bottle?

Sample containers intact?Sufficient sample volume for indicated test?All samples received within holding time?Container/Temp Blank temperature in compliance?

Water -VOA vials have zero headspace?

Water -pH acceptable upon receipt?Adjusted?Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes i No l 0 NoEl M NoM 21 -No O RI No O Ri No 0 RI No O 121 No O E! No C El No D a No 2 El No l E No a Checked by Not Present El Not Present 2 Not Present i 106C No VOA vials submitted RI Not Applicable 2 Any No and/or NA (not applicable) response must be detailed in the comments section below._____________________________________________

Client contacted:

Date contacted:

Person contacted-Contacted by: Comments: Regarding:

C_Corrctive Action TRACKING NO. PAGE NO 50327RROO£'

060 AF.-!FTJJ!J~d7F

'- jay 23. 2002 Oscar Paulson Kennecott Uranium Company 43 miles NW of Rawlins PO Box 1500 Rawlins, WY 82301 Workorder No.: C02050327 ANALYTICAL SUNWIARY REPORT....f...., ..-.11 I .....Project Name: Sweetwater Uranium Energy Laboratories Inc. received the following 2 samples from Kennecort Uranium Company on 5/10/2002 for analysis.Sample ID C02050327-001 Client Sample ID Collect Date Receive Date Matrix Can PVC Primer 05/09/02 13:50 05/10/02 Aqueous Test Volatilc Organics.

Mcthanol Extraction SWVS60B VOCs. Standard List Same As Abovc C02050327-0('

Can PVE Cement 05/09/02 13:50 05/101(/02 Aqueous There were no problems with the analyses and all data for associated QC met EPA or laboratory specifications except where noted in the Case Narrative or Report.If you have any questions regarding these tests results, please call.y>port Approved By: xv 'TRACKItSG NO. PAGE NO.5. 03 27100 007

-7 CLIENT: Kennecort Uranium Company Project: Sweetwater Uranium Sample Delivery Group: C02050327 Date: 23-A'ay-02 CASE NARRATIVE THIS IS THE FINAL PAGE OF THE LABORATORY ANALYTICAL REPORT BRANCH LABORATORY LOCATIONS eli-b -Energy Laboratories.

Inc. -Billings.

MT ell-g -Energy Laboratories, Inc. -Gillette, WY elI-h -Energy Laboratories, Inc. -Helena, MT ell-r -Energy Laboratories, Inc. -Rapid City, SD SAMPLE TEMPERATURE COMPLIANCE:

4-C (+/-2'C)Temperature of samples received may not be considered properly preserved by accepted standards.

Samples that are hand delivered immediately after collection shall be considered acceptable if there is evidence that the chilling process has begun.ENERGY LABORATORIES, INC. -CASPER.WY certifies that certain method selections contained in this report meet requirements as set forth by NELAC. Some client specific reporting requirements may not require NELAC reporting protocol.The total number of pages of this report are indicated by the last four digits of the tracking number located in the lower right comer..~ .I'.;1 1,0. PAGE t1O.*;C -7 ROOG -

NRC FORM 313 U.S. NUCLEAR REGULATORY COMMISSION APPROVED BY OMB: NO. 3150-0120 EXPIRES: 10/3112005 (4-2004) Estimated burden per response to comply with this mandatory collection request: 7 10 CFR 30, 32. 33 hours3.819444e-4 days 0.00917 hours 5.456349e-5 weeks 1.25565e-5 months . Submittal of the application Is necessary to determine that the applicant is 34. 35 3,39. and 40 qulified and that adequate procedures exist to protect the public health and safety.Send comments reaarding burden estimate to the Records and FOWPrivacy Services Branch (T-5 F52). U.S. Nuclear Regulatory Commission, Washington.

DC 20555-0001, or by Internet e-mail to lnfocollects@nrc.aov and to the Desk Officer, Office o1 Infrmiation and Regulatory Affairs, NEOB-1020i, (3150-0120), Office of Management APPLICATION FOR MATERIAL LICENSE and Budget. Washington, DC 20503. If a means used to Impose an Information collection does not display a currently valid OMB control number, the NRC may not conduct or sponsor, and a person Is not required to respond to, the Information collection.

INSTRUCTIONS:

SEE THE APPROPRIATE LICENSE APPLICATION GUIDE FOR DETAILED INSTRUCTIONS FOR COMPLETING APPLICATION.

SEND TWO COPIES OF THE ENTIRE COMPLETED APPLICATION TO THE NRC OFFICE SPECIFIED BELOW.APPLICATION FOR DISTRIBUTION OF EXEMPT PRODUCTS F5LE APPLICATIONS WITH: DIVISION OF INDUSTRIAL AND MEDICAL NUCLEAR SAFETY OFFICE OF NUCLEAR MATERIALS SAFETY AND SAFEGUARDS U.S. NUCLEAR REGULATORY COMMISSION WASHINGTON, DC 206550001 ALL OTHER PERSONS FILE APPUCATIONS AS FOLLOWS: IF YOU ARE LOCATED IN: ALABAMA. CONNECTICUT.

DELAWARE.

DISTRICT OF COLUMBIA, FLORIDA, GEORGIA, KENTUCKY, MAINE, MARYLAND, MASSACHUSETTS, MISSISSIPPI.

NEW HAMPSHIRE, NEW JERSEY. NEW YORK, NORTH CAROLINA, PENNSYLVANIA.

PUERTO RICO, RHODE ISLAND.SOUTHCAROLINA TENNESSEE.

VERMONTVIRGINA.VIRGIN ISLANDS,OR WEST VIRGINIA.

SEND APPLICATIONS TO: LICENSING ASSISTANCE TEAM DIVISION OF NUCLEAR MATERIALS SAFETY U.S. NUCLEAR REGULATORY COMMISSION.

REGION I 475 ALLENDALE ROAD KING OF PRUSSIA PA 19406-1415 IF YOU ARE LOCATED IN: ILLINOIS, INDIANA, IOWA. MICHIGAN, MINNESOTA, MISSOURI OHIO, OR WISCONSIN, SEND APPLICATIONS TO: MATERIALS LICENSING BRANCH U.S. NUCLEAR REGULATORY COMMSSION.

REGION II 2443 WARRENVLLE ROAD. SUITE 210 LISLE, IL 60532-4352 ALASKA, ARIONA, ARKANSAS, CALIFORNIA, COLORADO, HAWAII, IDAHO, KANSAS, LOUISIANA.

MONTANA. NEBRASKA, NEVADA, NEW MEXICO. NORTH DAKOTA, OKLAHOMA, OREGON, PACIFIC TRUST TERRITORIES.

SOUTH DAKOTA. TEXAS, UTAH, WASHINGTON, OR WYOMING, SEND APPLICATIONS TO: NUCLEAR MATERIALS LICENSING BRANCH U.S. NUCLEAR REGULATORY COMMISSION.

REGION IV 611 RYAN PLAZA DRIVE. SUITE 400 ARLINGTON.

TX 76011-4006 PERSONS LOCATED IN AGREEMENT STATES SEND APPLICATIONS TO THE U.S. NUCLEAR REGULATORY COMMISSION ONLY IF THEY WISH TO POSSESS AND USE LICENSED MATERIAL IN STATES SUBJECT TO U.S.NUCLEAR REGULATORY COMMISSION JURISDICTIONS.

1. THIS IS AN APPLICATION FOR (Check OpprHate a r8) 2. NAME AND MAILING ADDRESS OF APPUCANT (Indude ZIP codel A NEW LICENSE Kennecott Uranium Company PO Box 1500 U B. AMENDMENTTOLICENSENUMBER Rawlins, Wyoming 82301 -1500 I0 C. RENEWALOFLICENSENUMBER SUA-1350 3. ADDRESS WHERE LICENSED MATERIAL WILL BE USED OR POSSESSED

4. NAME OF PERSON TO BE CONTACTED ABOUT THIS APPLICATION Sweetwater Uranium Project 42 Miles Northwest of Rawlins Oscar A. Paulson Rawlins, Wyoming 82301 TELEPHONENUMBER (307) 324-4924 SUBMIT ITEMS S THROUGH 11ON 8-1/2 X I 1-PAPER. THE TYPE AND SCOPE OF INFORMAriON TO BE PROVIDED IS DESCRIBED IN THE UCENSE APPLICATION GUIDE.S. RADIOACTIVE MATERIAL a. Element and mass number, b. chmical and/or physical form: and c. matimum amount 6. PURPOSE(S)

FOR WHICH LICENSED MATERIAL WILL BE USED.which WIN be possessed at any one time.1. INDIVIDUANGS)

RESPONSIBLE FOR RADIATION SAFETY PROGRAM AND THEIR S. TRAINING FOR INDIVIDUALS WORKING IN OR FREQUENTING RESTRICTED AREAS.TRAINING EXPERIENCE.

9. FACILmES AND EQUIPMENT.

10. RADIATION SAFETY PROGRAM.1Z LICENSEFEES (See 10CFR 170 ad S&mr 170.31)I1. WASTE MANAGEMENT.

FEE CATEGORY 2A(2) AMOUNT___________________________________________ENCOLUOSTED

$ 0.00 13. CERTIFICATION. (Muust b.so atad by apranQ THE APPLICANT UNDERSTANDS THAT ALL STATEMENTS AND REPRESENTATIONS MADE IN THIS APPLICATON ARE BINDING UPON THE APPLICANT.

THE APPLICANT AND ANY OFFICIAL EXECUTING THIS CERTIFICATION ON BEHALF OF THE APPLICANT, NAMED IN ITEM 2 CERTIFY THAT THIS APPLICATION IS PREPARED IN CONFORMITY WITH TITLE 10. CODE OF FEDERAL REGULATIONS.

PARTS 30.32.33.34,35.

36.39, AND 40, AND THAT ALL INFORMATION CONTANED HEREIN IS TRUE AND CORRECT TO THE BEST OF THEIR KNOWLEDGE AND BELIEF.WARNING: I1 U.S.C. SECTION 1001 ACTOFJUNE 25,194862STAT.

749 MAKES ITACRIMINALOFFENSE TO MAKEA U. LLYFALSES TEMENTOR REPRESENTATION TO ANY DEPARTMENT OR AGENCY OF THE UNITED STATES AS TO ANY MATrER WITHIN ITS JURISyew ,Ip N srR CERTiFYING OFFICER-TYPEDIPRINTED NAME AND TIRE ISGNAU11/7 l l DATE Oscar Paulson, Facility Supervisor lV (. ho 07/01/2004 FOR NRC USEVINLY v TYPE OF FEE FEE LOG FEE CATEGORY AMOUNT RECEIVED CHECK NUMBER COMMENTS APPROVED BY DATE NRC FORM 313 (4-2004)PRINTED ON RECYCLED PAPER

ML042110348

Text

Dear Mr. Janosko:

Subject:

4.0 INTRODUCTION

1.0 INTRODUCTION

4.0 REFERENCES

3.8 micrograms

2.5 million

1.3 milligrams

1.1 micrograms

2.6 micrograms

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