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Home My WebLink AboutDRC-2010-004824 - 0901a068801bee04DENISO MINES iwr.^ om n_ Q D h til Denison Mines (USA) Corp. 105017th street Suite 950 Denver, CO 80285 USA Tel: 303 628-7798 Fax: 303 389-4125 www.denisonfflin8s.com August 30, 2010 VIA FEDERAL EXPRESS Mr. Dane Finerfrock, Co-Executive Secretary, Utah Water Quality Board, Utah Department of Environmental Quality, 195 North 1950 West Salt Lake City, Utah 84114-4820 Dear Mr. Finerfrock: Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A BAT Performance Standards Monitoring Report for the 2"** Quarter of 2010 Enclosed please fmd two copies of the DMT Performance Standards Monitoring Report and Cell 4A BAT Performance Standards Monitoring Report for the 2"'' Quarter of 2010, as required under Parts I.F.2 and I.F.3 of the White Mesa Mill's State of Utah Groundwater Discharge Permit No. UGW370004. Also enclosed are two CDs, each with an electronic word-searchable copy of the enclosed Report. If you have any questions regarding this Report, please contact the undersigned at (303) 389- 4132 or Mr. David Turk at (435) 678-2221. Yours very truly, DENISON MINES (USA) CORP. Jo Ann Tischler Director, Compliance and Permitting cc David C. Frydeniund Ron F. Hochstein Harold R. Roberts David E. Turk Kathy Weinel OENISOJ)~~ MINES August 30, 20 I 0 VIA FEDERAL EXPRESS Mr. Dane Finerfrock, Co-Executive Secretary, Utah Water Quality Board, Utah Department of Environmental Quality, 195 North 1950 West Salt Lake City, Utah 84114-4820 Dear Mr. Finerfrock: Donllon Mi_ (USA) Corp. 1050 11th SIIH~ Sullo 150 Donv.r. CO 10215 USA ral : 303nl·nll Fa. : 303 311-4125 www.denlsonmlnel.com Re: Transmittal of DMT Performance Standards Monitoring Report and Cell 4A BAT Performance Standards Monitoring Report for the 2nd Quarter of 2010 Enclosed please find two copies of the DMT PerfOlmance Standards Monitoring Report and Cell 4A BAT PerfOlmance Standards Monitoring Report for the 2nd Quarter of 2010, as required under Parts I.F.2 and I.F.3 of the White Mesa Mill's State of Utah Groundwater Discharge Permit No. UGW370004. Also enclosed are two CDs, each with an electronic word-searchable copy of the enclosed Report. If you have any questions regarding this Report, please contact the undersigned at (303) 389- 4132 or Mr. David Turk at (435) 678-2221. Yours very truly, c~ DENISON MINES (USA) CORP. Jo Ann Tischler Director, Compliance and Permitting cc David C. Frydenlund Ron F. Hochstein Harold R. Roberts David E. Turk Kathy Weinel WHITE MESA URANIUM MILL DMT PERFORMANCE STANDARDS MONITORING REPORT AND CELL 4A BAT PERFORMANCE STANDARDS MONITORING REPORT 2nd Quarter April through June 2010 State of Utah Groundwater Discharge Pennit No. UGW370004 Prepared By: Denison Mines (USA) Corp. 1050 lih Street, Suite 950 Denver, CO. 80265 August 30, 2010 TABLE OF CONTENTS PAGE 1.0 INTRODUCTION ............................................................................................................................ 3 2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED DURING THE QUARTER .......................................................................................................................................... 3 3.0 WEEKLY TAILINGS WASTEWATER POOL ELEVATION MONITORING ....... 3 4.0 MONTHLY SLIMES DRAIN WATER LEVEL MONITORING ................................... 5 4.1 GENERAL .......................................................................................................................... 5 4.2 RESULTS FOR THE QUARTER ............................................................................................. 6 4.3 QUALITY ASSURANCE EVALUATION AND OAf A VALIDATION .......................................... 7 4.4 GRAPHIC COMPARISON TO PREVIOUS YEAR ..................................................................... 7 5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND .................. 7 6.0 WEEKLY FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA ............................................................................................................................ 7 7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS ......................................... 8 8.0 DECONTAMINATION PADS .................................................................................................... 8 8.1 EXISTING DECONTAMINATION PAD ................................................................................... 8 8.2 NEW DECONTAMINATION PAD .......................................................................................... 9 9.0 CELL 4A BAT PERFORMANCE STANDARDS REPORT FOR THE QUARTER ........................................................................................................................................ 10 9.1 LOS MONITORING .......................................................................................................... 10 9.1.1 Operational Status of LDS Pumping and Monitoring Equipment .............................. 10 9.1.2 Measurement a/Weekly Fluid Head At the Lowest Point in the Secondary Membrane 10 9.1.3 Measurement of the Volume o./Fluids Pumpedfrom the LDS ................................... 11 9.2 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELL 4A .................................... 11 9.3 SLIMES DRAIN RECOVERY HEAD MONITORING .............................................................. 11 10.0 SIGNATURE AND CERTIFICATION .................................................................................. 11 1 LIST OF TABLES Table I -Summary of Waste Water Pool Elevations Table 2 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2009 Table 3 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2010 Attachment A B C D E F G F-l F-2 ATTACHMENTS Description Tailings Cell and Roberts Pond Wastewater Elevations Notices Pursuant to I.G.3 of the Pennit Monthly Cell 2 Slimes Drain Water level Over Time Graph of Cell 2 Slimes Drain Water Levels over Time Cell Liner Repair Reports and Notices Annual Decontamination Pad Inspections Inspection of Existing Decontamination Pad Inspection of New Decontamination Pad Cell 4A Leak Detection System Data for the Quarter 2 PAGE 4 6 6 TABLE OF CONTENTS PAGE 1.0 INTRODUCTION .............................................................................................................. 3 2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED DURING THE QUARTER ..................................................................................................................................... 3 3.0 WEEKL Y TAILINGS WASTEWATER POOL ELEVATION MONITORING ...... 3 4.0 MONTHLY SLIMES DRAIN WATER LEVEL MONITORING ............................... 5 4.1 GENERAL .......................................................................................................................... 5 4.2 RESULTS FOR THE QUARTER ............................................................................................. 6 4.3 QUALITY ASSURANCE EVALUATION AND DATA V ALIDA nON .......................................... 7 4.4 GRAPHIC COMPARISON TO PREVIOUS YEAR ..................................................................... 7 5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND ................ 7 6.0 WEEKLY FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA ............................................................................................................................................. 7 7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS .................................... 8 8.0 DECONTAMINATION PADS ......................................................................................... 8 8.1 EXISTING DECONTAMINATION PAD ................................................................................... 8 8.2 NEW DECONTAMINATION PAD .......................................................................................... 9 9.0 CELL 4A BAT PERFORMANCE STANDARDS REPORT FOR THE QUARTER 10 9.1 LOS MONITORING .......................................................................................................... 10 9.1.1 Operational Status of LDS Pumping and Monitoring Equipment .............................. 10 9.1.2 Measurement of Weekly Fluid Head At the Lowest Point in the Secondary Membrane 10 9.1.3 Measurement of the Volume of Fluids Pumped/i-om the LDS ................................... 11 9.2 MEASUREMENT OF WEEKLY WASTEWATER FLUIDS IN CELL 4A .................................... 11 9.3 SLIMES DRAIN RECOVERY HEAD MONITORING .............................................................. 11 10.0 SIGNATURE AND CERTIFICATION ........................................................................ 11 1 LIST OF TABLES Table I -Summary of Waste Water Pool Elevations Table 2 -Cell 2 Slimes Drain Recovery Head and SORE Values for 2009 Table 3 -Cell 2 Slimes Drain Recovery Head and SORE Values for 2010 Attachment A B C o E F G F-I F-2 A TT ACHMENTS DesCl"iption Tailings Cell and Roberts Pond Wastewater Elevations Notices Pursuant to I.G.3 of the Pelmit Monthly Cell 2 Slimes Drain Water level Over Time Graph of Cell 2 Slimes Drain Water Levels over Time Cell Liner Repair Reports and Notices Annual Decontamination Pad Inspections Inspection of Existing Decontamination Pad Inspection of New Decontamination Pad Cell 4A Leak Detection System Data for the Quarter 2 4 6 6 WHITE MESA URANIUM MILL DMT PERFORMANCE STANDARDS MONITORING REPORT AND CELL 4A BAT PERFORMANCE STANDARDS MONITORING REPORT FOR THE 2nd QUARTER OF 2010 1.0 INTRODUCTION This is the routine Discharge Minimization Standards ("DMT") Performance Standards Monitoring Report for the 2nd quarter of2010 (the "Quarter") prepared by Denison Mines (USA) Corp. ("Denison"), as required under Part I.F.2 of the White Mesa Mill's (the "Mill's") State of Utah Groundwater Discharge Permit No. UGW370004 (the "Permit"), and the Routine Cell 4A Best Available Technology ("BAT") Performance Standards Monitoring Report for the Quarter, as required under Part I.F.3 of the Pennit. 2.0 MEASUREMENTS TAKEN AND MONITORING PERFORMED DURING THE QUARTER During the Qumter, the following DMT monitoring was perfonned or addressed, as required under Part I.E.7 of the Permit: • Weekly tailings wastewater pool elevations for tailings Cells I and 3; • Monthly slimes drain water levels in Cell 2; • Weekly wastewater level measurements in Roberts Pond; • Weekly feedstock storage area inspections and inspections of feedstock materials stored outside of the feedstock storage area; • Any tailings cell and pond liner system repairs; and • Decontamination Pad Concrete Inspection Also during the Quarter, the following Cell 4A BAT performance standards monitoring was performed or addressed, as required by Part I.E.8 of the Permit: • Leak detection system ("LDS") monitoring for CeIl4A; and • Weekly tailings wastewater pool elevations for tailings Cell 4A. 3.0 WEEKL Y TAILINGS WASTEWATER POOL ELEVATION MONITORING Mill personnel monitored and recorded weekly the elevation of wastewater in Tailings Cells I, 3 and 4A to ensure compliance with the maximum wastewater elevation criteria mandated by Condition 10.3 of the Mill's State of Utah Radioactive Materials License No. UT 1900479 (the 3 "License"). These measurements were made from an elevation survey. The results of such monitoring, reported as feet above mean sea level (fmsl), are included in Attachment A. Condition 10.3 of the License provides that the freeboard limit for Cell 1 shall be set in accordance with procedures that have been approved by the U.S. Nuclear Regulatory Commission ("NRC"). Under those procedures the freeboard limit for Cell 1 is set as per the January 10, 1990 Drainage Report for Cell 1 at a liquid maximum elevation of 5,615.4 fms!' Condition 10.3 of the License also provides that the freeboard limit for Cells 3, 4A and 4B shall be recalculated annually in accordance with the procedures approved by the Executive Secretary of the State of Utah Radiation Control Board (the "Executive Secretary"). The current fi'eeboard limit for Cell 3 was previously calculated under this procedure at 5,601.6 fms!' However, in a letter fi'om the Executive Secretary dated November 20, 2008, an interim variance and limit was established at 5,602.5 finsl for Cell 3. In conjunction with the variance established above, an interim maximum elevation for Cell 4A was also established at 5,593.74 fms1. Cell 4B is under construction at this time, and a fi'eeboard limit has not yet been determined for this eel!. In addition, Part l.D.2 of the Pennit provides that under no circumstances shall the freeboard of any tailings cell be less than three feet, as measured from the top of the flexible membrane liner ("FML"). The top of the FML in Cell 1 is at 5,618.5 fmsl, the top of the FML in Cell 3 is at 5,608.5 fmsl and the top of the FML in Cell 4A is at 5,598.5 fms!. This means that the maximum wastewater pool elevations in Cells I, 3 and 4A permitted under Part !.D.2 of the Permit are 5,615.5, 5,605.5 and 5,595.5 finsl, respectively. The wastewater pool elevations in Cells I, 3 and 4A, as measured during the Quarter, are summarized in the following Table 1. Except as indicated in Table 1, the applicable freeboard limits were not exceeded during the Quarter. Table 1 -Summary of Waste Water Pool Elevations Tailings Maximum Maximum Maximum Cell Wastewater Elevation Wastewater Elevation Wastewater Measured During the Permitted Under Elevation Permitted Quarter (fmsl) License Condition Under Part I.D.2 of 10.3 (fmsl) the Permit (fmsl) -Cell I 5,614.57 5,615.4 5,615.5 Cell 3 5,602.96* 5,602.5 5,605.5 5,602.31 ** Cell4A 5,586.76 5,593.74' 5,595.5 " 'ThIS exceedance of the freeboard lumt for Cell 3 was the subject ofa NotIce to the Execullve Secretary under Part I.G.3 of the Permit and Utah Administrative Code ("UAC") R317-6-6.16(C), dated June 21 2010, a copy of which Notice is included in Attachment B. 4 **This is the maximum wastewater elevation in Cell 3 during the Quarter, other than the exceedance that was the subject of the Notice to the Executive Secretary under Part LG.3 of the Permit and UAC R317-6-6.16(C) referred to above. 'The freeboard limit for Ce1l4A is not set out in the License. The freeboard limit of 5,593.74 for Ce1l4A is set out in a letter from the Executive Secretary dated November 20, 2008. It should be noted that the maximum elevation of 5,593.74 finsl for Cell 4A has been set assuming that the total probable maximum precipitation ("PMP") volume for Cells 2, 3 and 4A will be accommodated in Cell 4A. By letter dated December 11, 2008, Denison applied for an amendment to the License to set the fi·eeboard limit for Ce1l4A at 5,593.74 finsl and to eliminate the need to set a freeboard limit for Cell 3, given that the freeboard limit of 5,593.74 finsl for Cell 4A is adequate to accommodate the total PMP volume for Cells 2, 3 and 4A. The Utah Division of Radiation Control ("DRC") has indicated, in a letter of April 29, 2010, their agreement with Denison's proposed revisions to the freeboard limits for Cells 3 and 4A, pending Denison's submittal of revisions to the Pennit and the White Mesa Mill Tailings Management System and Discharge Minimization Technology (DMT) Monitoring Plan, 3/10 Revision: Denison-7 (the "DMT Plan") reflecting the proposed changes. Denison prepared and submitted these revisions on August 4, 20 I O. 4,0 MONTHL Y SLIMES DRAIN WATER LEVEL MONITORING 4.1 General Part I.D.3(b)(I) of the Pennit provides that the Pennittee shall at all times maintain the average wastewater recovery head in the slimes drain access pipes of each of Cells 2 and 3 to be as low as is reasonably achievable, in accordance with the DMT Plan. Part l.D.3(b)(3) of the Permit provides that for Cell 3, this requirement shall apply after initiation of dewatering operations. Similarly, Part l.D.6( c) of the Permit provides that, after the Permittee initiates pumping conditions in the slimes drain layer in Cell 4A, the Permittee will provide: I) continuous declining fluid heads in the slimes drain layer, in a manner equivalent to the requirements found in Part I.D.3(b), and 2) a maximum head of 1.0 feet in the tailings (as measured fi·om the lowest point of the upper FML) in 6.4 years or less. Part l.D.3(b)(2) of the Permit provides that the Permittee shall conduct a monthly slimes drain recovery test at each tailings cell that meets the following minimum requirements: I) includes a duration of at least 90-hours, as measured fi'om the time that pumping ceases, and 2) achieves a stable water level at the end of the test, as measured by three consecutive hourly water level depth measurements, with no change in water level, as measured to the nearest 0.0 I foot. At this time, initiation of dewatering operations has not commenced in Cell 3 nor has the Mill initiated pumping conditions in the slimes drain layer of Cell 4A. As a result, the requirements in Part l.E.7(b) to monitor and record monthly the depth to wastewater in the slimes drain access pipes as described in Part 1.0.3 of the Pennit apply only to Cell 2 at this time. Accordingly, this Report is limited to slimes drain recovery head infonnation relating to Cell 2 only. 5 Pursuant to Parts I.E.7(b) and I.F.2 of the Pennit, Section 8.2 of the DMT Plan and correspondence from DRC, dated February 7, 2008, the results of monthly recovery monitoring of the slimes drain for Cell 2 are to be recorded and included with the results of quarterly monitoring in the quarterly White Mesa Mill DMT Peljormance Standards Monitoring Report and Cell 4A BAT Performance Standards Monitoring Report (the "DMT Reports"). FUliher, beginning in 2008, quarterly DMT Reports must include both the cutTent year monthly values and a graphic comparison to the previous year. An annual slimes drain recovery head report, that addresses the requirements of Part I.F.ll of the Permit and Section 8.2 of the DMT Plan must be included in the 4th quarter DMT Report. 4.2 Results for the Quarter In accordance with these requirements, the individual monthly slimes drain recovery head monitoring data for the Quarter, which includes the date and time for the stmi and end of the recovery test, the initial water level, and the final depth to stable water level, is included as Attachment C to this RepOit. Those data, as well as the data for the previous year, including the slimes drain recovery elevations ("SDRE"), are summarized in the following Tables 2 and 3 and presented graphically in Attachment D. Table 2 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2009 Elevation of Reported Final Depth to SORE Values Reported 2009 Test Closing Date Measurement Point Stable Water Level as fmsl 1/30/2009 5,614,83 11.25 5,603,58 212712009 5,614.83 9.35 5,605.48 312812009 5,614,83 8,84 5,605,99 4127/2009 5,614,83 11,98 5,602.85 512012009 5,614,83 10,28 5,604,55 612212009 5,614.83 I3 5,601.83 7/30/2009 5,614.83 13 5,601.83 8/31/2009 5,614.83 11.04 5,603,79 9/2812009 5,614,83 11.46 5,603.37 10/3012009 5,614.83 13.35 5,601.48 11/2312009 5,614.83 12.49 5,602,34 12114/2009 5,614.83 13,12 5,601.71 Table 3 -Cell 2 Slimes Drain Recovery Head and SDRE Values for 2010 Elevation of Reported Final Depth to SORE Values Reported 2010 Test Closing Date Measurement Point Stable Water Level as fmsl 1115/2010 5,614.83 13.96 5,600.87 2/21/2010 5,614,83 12.5 5,602,33 - 311512010 5,614.83 11.04 5,603,79 4/1212010 5,614.83 10.4 5604.43 511912010 5,614.83 10,43 5604.40 6/30/2010 5,614.83 10.13 5604.70 6 4.3 Quality Assurauce Evaluation and Data Validation Denison management has evaluated all slimes drain data collected, data collection methods, and all related calculations required by the Permit, and have verified the accuracy and reliability of both the data and calculations reported. As a result of its quality assurance evaluation and data validation review, Denison has concluded that all of the pl and 2nd Quarter 2010 and all of the 2009 monthly slimes drain tailings fluid elevation measurements set out in Tables 2 and 3 meet the test perfOlmance standards found in Part l.D.3(b)(2) of the Pelmit and can bc used for purposes of detelmining compliance with the requirements of Part l.D.3(b )(2) of the Pennit. 4.4 Graphic Comparison to Previous Year A graph showing the final depth to stable water level readings for each month in 20 I 0 and 2009, for which validated data is available (see Section 4.3 above), is included as Attachment D, which shows a graphic comparison of this Quarter's data to data for the previous year. 5.0 WEEKLY WASTEWATER LEVEL MONITORING: ROBERTS POND During the Quarter, Mill personnel monitored and recorded weekly the wastewater levels at Roberts Pond to determine compliance with the DMT operations standards in Pmi I.D.3(e) of the Pemlit. Part I.D.3(e) of the Pennit provides that the water level in Roberts Pond shall not exceed an elevation of 5,624 fins!. The maximum wastewater elevation measured in Robert's Pond during the quarter was 5,619.56 fmsl, which did not exceed the maximum permitted elevation of 5,624 fms!' The results of such monitoring are included in Attachment A. 6.0 WEEKL Y FEEDSTOCK STORAGE AREA INSPECTIONS AND INSPECTIONS OF FEEDSTOCK MATERIAL STORED OUTSIDE THE FEEDSTOCK STORAGE AREA Weekly feedstock storage area inspections were perfonned by the Mill's Radiation Safety Department, to confilm that the bulk feedstock materials are stored and maintained within the defined area described in the Pennit and that all altemate feedstock located outside the defined feedstock area is maintained within containers that comply with the requirements of Part l.D.II of the Pennit. The results of these inspections are recorded on the Weekly Mill Inspection forms, which are available at the Mill for inspection. No variance in stored materials from these requirements was observed during the inspections. 7 7.0 TAILINGS CELLS AND POND LINER SYSTEM REPAIRS The liner systems at Cells 1, 2, and 3 were inspected on a daily basis pursuant to the requirements of Sections 2.1 and 2.2 of the Mill's DMT Plan. The results of those inspections are recorded on the Mill's Daily Inspection Data sheets, which are available at the Mill for review. A visual inspection of Roberts Pond was performed on a weekly basis. The results of those inspections are recorded on the Weekly Mill Inspection fonns, which are available at the Mill for review. In accordance with Part l.E.7(f) of the Pennit, in the event that any liner defect or damage is identified during a liner system inspection, the Mill shall immediately implement the currently approved Liner Maintenance Provisions. Further, Part l.F. 2 of the Permit provides that when a liner repair is perfOtmed at any tailings cell or at Roberts Pond, a Repair Report shall be prepared and included with the next quarterly DMT repOli. Mill personnel detected an accumulation of fluid in the LDS standpipe of Cell 1 on Wednesday, June 2, 2010. Transfer of fluids from Cell 1 to Cell4A to lower the Cell 1 level sufficiently to detect and repair leaks or damage began on June 2, 2010. Liner repairs are still underway at the time of this report. A Cell 1 liner repair report will be submitted to the Utah Department of Environmental Quality ("UDEQ") upon completion of the repair program. A copy of the notice filed with UDEQ regarding the initial Detection ofliquid in the Cell 1 LDS is provided in Attachment E. During the Quarter, no liner repairs were perfonned at any of the Mill's tailings cells other than Cell 1. 8.0 DECONTAMINATION PADS 8.1 Summary of Daily Water Level (Depth) Inspections Section 3.1 of the DMT Plan requires that the vertical inspection portals located between the primary and secondary containments in the New Decontamination Pad will be visually observed on a weekly basis as a means of detecting any leakage from the primary containment into the void between the primary and secondary containments. As required by Section 8.2(b) of the DMT Plan, the following Table 4 indicates the water level measurements in each portal during the quarter. 8 Table 4 -New Decontamination Pad Inspection Portal Level Portall Portall Portal 1 Liquid Level Liquid Level Liquid Level Date (iu Feet) (in Feet) (in Feet) 412110 0.00 0.00 0.00 4/9110 0.00 0.00 0.00 411 6/10 0.00 0.00 0.00 412311 0 0.00 0.00 0.00 4/3011 0 0.00 0.00 0.00 5/7/10 0.00 0.00 0.00 5114110 0.00 0.00 0.00 5121110 0.00 0.00 0.00 5128110 0.00 0.00 0.00 ---6/4110 0.00 0.00 0.00 6/1111 0 0.00 0.00 0.00 611 811 0 0.00 0.00 0.00 6/25/10 0.00 0.00 0.00 As can be seen from the foregoing table, no fluids were observed to be present in any of the pOltals during the quatter. 8.2 Annual Inspection of Existing Decontamination Pad The Existing Decontamination Pad was taken out of service and inspected during the second quarter on May 14, 2010, to ensure the integrity of the steel tank, as required by Part I.H.5(c) of the Permit and Section 6.5 of the DMT Plan. No significant deterioration or damage was observed. Repairs and maintenance, including a new cement floor in the temporary holding tank, new drop lines between the temporary and main holding tanks, caulking and sealing of cracks, were completed at the time of the inspection. Installation of a new capture pipe at the pad exit has also been completed prior to this report. The inspection report and photos taken during the inspection are provided in Attachment F-2. 8.3 New Decontamination Pad The New Decontamination pad was placed into service on March 22, 2010. Use of the New Decontamination Pad was temporarily suspended as a result of a cease and desist order from UDEQ dated May 18, 2010. UDEQ's approval for use of the New Decontamination Pad has been withheld pending submittal of revisions to the DMT Plan and UDEQ observation of hydrostatic testing of the in-ground water holding tanks. Revisions to the DMT plan were submitted by Denison on August 4, 2010 and are currently under review by UDEQ. Hydrostatic testing will be re-pet-fonned during the third quatter of 2010, and advance notice will be provided to UDEQ to allow UDEQ staff to observe testing. The New Decontamination Pad was taken out of service and inspected during the second quarter on April 13,2010 to ensure integrity of the washpad's exposed concrete surface, as required by Part I.H.4(a)3 of the Permit and Section 6.5 of the DMT Plan. No abnormalities were identified. 9 No significant cracks (greater than liS inch), deterioration or damage were identified. No repairs were required at the time of the inspection. A few minor cracks (less than liS inch) were observed. These minor cracks are being monitored to detennine whether they expand over time and require repair. It was also determined that solids deposition needed to be removed from the storage tanks. This removal was completed by April 14, 20 10. The inspection repOli and photos taken during the inspection are provided in Attachment F -I. 9.0 CELL 4A BAT PERFORMANCE STANDARDS REPORT FOR THE QUARTER This Section constitutes the routine Cell 4A BAT Performance Standards Monitoring Report for the Quarter, as required under Part I.F.3 of the Permit. 9.1 LDS Monitoring 9.1.! Operational Status oj'LDS Pumping and Monitoring Equipment The LDS pumping and monitoring equipment, including, but not limited to, the submersible pump, pump controller, head monitoring, and flow meter equipment operated continuously during the Quarter. During the Quarter, there were no failures of any pumping or monitoring equipment not repaired and made fully operational within 24-hours of discovery, as contemplated by Part I.E.S(a)(l) of the Pennit. However, due to adverse weather conditions and excessive snow on the tailings cells and tailings dikes, the LDS was not able to be accessed for monitoring during the week of January 22, 20 I 0, for safety reasons, and was not monitored during that week. 9.1.2 Measurement oj' Weekly Fluid Head At the Lowest Point in the SecondaJY Membrane The readings pertaining to the fluid head above the lowest point in the secondary FML for Cell 4A are provided in Attachment G. As can be seen from a review of Attachment G, at no point in the Quarter did the fluid head in the Cell 4A LDS sump exceed a I-foot level above the lowest point in the lower FML on the Cell floor (where for purposes of compliance monitoring this 1- foot distance equates to 2.2S feet above the LOS system transducer), as stipulated by Part I.E.S(a)(2) of the Permit. During the Quarter, the fluid head in the Cell 4A LOS sump did not exceed 9.0 inches above the LOS transducer. 10 JI. /..J kleasllrelllell/o//he f/olllllle 0/ I'll/1m' P,lI1ljJed ./i'OIIl/he LlJS The readings pertaining to the volume of fluids pumped are provided in Attachment G. As can be seen from a review of Attachment G, during the Quarter, the average daily LOS flow volume did not exceed 24,160 gallons/day, as stipulated by Part I.E.8(a)(3) of the Pelmit (based on the maximum head recorded on the FML during the Qual1er of about 30 feet, the allowable leakage rate would actually be approximately 21,750 gallons per day, as determined under the Mill's Cell 4A BAT Operations and Maintenance Plan, Table I, and assuming a liner elevation of 5555.55 feet and approximately 39.66 acres ofliquid area). For the Quarter, a total of 0 gallons (no fluid) was pumped. 9.2 Measurement of Weekly Wastewater Fluids in Cell4A Weekly fluid elevations for Cell 4A are provided in Attachment A along with elevations for Cells I and 3 and Roberts Pond. During the Quarter, the Mill operated and maintained wastewater levels in Cell 4A to provide the minimum vertical freeboard as required by Part I.E.8(a)(4) of the Pelmit. See the discussion in Section 3 above. 9.3 Slimes Drain Recovery Head Monitoring As the Mill has not initiated pumping conditions in the Cell 4A slimes drain system at this time, monthly recovery head tests and fluid level measurements are not required to be made at this time pursuant to Part I.E.8(b) of the Permit. 10.0 SIGNATURE AND CERTIFICATION This document was prepared by Denison on August 27, 2010. By: David C. Ii yde lund Vice President, Regulatory Affairs and Counsel CERTIFICATION: I certify, under penalty of law, that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel 11 properly gather and evaluate the infonnation submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the infonnation, the infonnation submitted is, to the best of my knowledge and belief, true, accurate and complete. [ am aware that there are significant penalties for submitting false infOlmation, including e pos bility of fine and imprisonment for knowing violations. Dav' Fry en lund Vice Preside t, Regulatory affairs and Counsel Denison Mines (USA) Corp. 12 INDEX OF ATTACHMENTS A Tailings Cell and Roberts Pond Wastewater Elevations B Notices Pursuant to l.G.3 of the Pennit C Monthly Cell 2 Slimes Drain Water level Over Time D Graph of Cell 2 Slimes Drain Water Levels over Time E Cell Liner Repair Reports and Notices F Annual Decontamination Pad Inspections F-I Inspection of Existing Decontamination Pad F-2 Inspection of New Decontamination Pad G Ce1l4A Leak Detection System Data for the Quarter Attachment A Tailings Cell and Roberts Pond Wastewater Elevations Robert ~ CIDL1 Cell 3 Cell4A Pond 4/2/2010 5613.68 5601.99 5585.67 5619.31 4/9/2010 5613.84 5601.81 5585.56 5619.27 4/16/2010 5613.65 5600.68 5585.95 5619.22 4/23/2010 5613.91 5601.88 5585.74 5619.4 4/30/2010 5613.94 5600.5 5585.78 5619.56 5/7/2010 5614.22 5601.61 5585.48 DRY 5/14/2010 5614.24 5601.38 5585.37 DRY 5/21/2010 5614.48 5602.31 5584.51 DRY 5/28/2010 5614.57 5599.98 5585.19 DRY 6/4/2010 5614.47 5599.63 5585.5 5617.91 6/11/2010 5613.99 5600.93 5585.93 5617.63 6/18/2010 5614.25 5602.96 5585.78 5618.06 6/25/2010 5613.40 5601.28 5586.76 5617.99 Attachment B Notices Pursuant to l.G.3 of the Pennit OENISOJ)~~ MINES June 21, 2010 VIA PDF AND EXPRESS DELIVERY Dane L. Finerfrock, Co-Executive Secretary Utah Water Quality Board Utah Department of Environmental Quality 195 North 1950 West P.O. Box 1448 10 Salt Lake City, UT 8411 4·48 10 Dear Mr. Finerfrock: oenllon Min •• (USA) COlp. 1050 17th Str .. ~ Suitt 950 Cenvlr, CO 80285 USA Ttl: 303 626·7796 Fax: 303 369-4125 WY/W.d.nlsonmln ... com Re: State of Utah Ground Water Discharge Permit No. UGW370004 White Mesa Uranium MiIl-Notice Pursuant to Part I.G.3 of the Permit and UAC R317-6-6.16(C) Please take notice pursuant to Part I.G.3 of the White Mesa Mill's (the "Mill's") State of Utah Groundwater Discharge Permit No. UGW370004 (the "Permit") and Utah Administrative Code ("UAC") R313-6-6.16(C) that Denison Mines (USA) Corp. ("Denison"), as operator of the Mill and holder of the Permit, fai led to meet the discharge minimization technology ("DMT") standards in Part I.D.2 of the Permit, by allowing the wastewater elevation in the Mill's tailings Cell 3 to exceed the freeboard limit for that Cell by approximately 5.5 inches, as described in more detail below. This exceedance was discovered at 8:50am on Friday June 18,20 10. Ini tial notice of this failure to maintain DMT was given by telephone to the Utah Department of Environmental Quality ("DEQ") Duty Officer at 3:55pm on Friday June 18,2010 at 80 1-536-4 123 (within 24 hours of the discovery). 1. Facts and Background Information a) Condition 10.3 of the Mill 's State of Utah Radioactive Materials License No. UT 1900479 (the "License") provides that freeboa rd limits for Cells 1 and 3 shall be set in accordance with procedures that have been approved by the U.S. Nuclear Regulatory Commission ("NRC"). Under those procedures: i' (i) The freeboard limits are sct as per the January 10, 1990 Drainage Report for Cell I at a liquid maximum elevation of 5,615.4 feet above mean sea level ("fmsl"); (ii) The freeboard limit for Cell 3 is detcrmined annually using a formula set out in the procedure. The current freeboard limit lor Cell 3 was previously calculated under this procedure at 5,601.6 finsl. However, in State of Utah Department of Environmental Quality ("UDEQ") correspondence dated November 20, 2008 an interim variance and limit was established at 5,602.5 fmsl for Cell 3; (iii) In conjunction with the variance established under (ii) above, an interim max imum elevation for Ccl14A was also established at 5,593.74 finsl; (iv) The maximum elevation of 5,593.74 fin sl for Cell 4A has been set assuming that the total probable maximum prccipitation ("PMP") vo lume for Cells 2, 3 and 4A will be accommodated in Cell 4A. By letter dated December II, 2008, Denison applied for an amendment to the License to set the freeboard limit for Cell 4A at 5,593.74 fmsl and to eliminate the need to set a freeboard limit for Cell 3, given that the freeboard limit of 5,593.74 fmsl for Ce1l 4A is adequate to accommodate the total PMP volume for Cells 2, 3 and 4A; and (v) In addition, Part I.D.2 of the Permit provides that under no circumstances shall the freeboard of any tailings cell be less than three feet, as measured from the top of the flexible membrane liner ("FML"). The top of the FML in Cell I is at 5,618.5 fmsl, and the top of the FML in Cell 3 is at 5,608.5 fms l. This means that Part I.D.2 of the Pennit providcs a secondary requirement that the maximum wastewater pool elevations in Cells I and 3 cannot exceed 5,6 15.5 and 5,605.5 fmsl, respectively. b) In a letter to Denison dated April 29, 20 10, UDEQ has indicated their agreement with Denison's position that the frceboard limit is not applicable to Cell 3, since Cell 3 is in pre-closure stages, and the PMP flood volume of Cell 3 can be attributed to, and managed in, Cell 4A. The April 29 letter indicated that to formalize this removal of freeboard limit, three documents needed to be revised, specifically the Mill's Radioactive Materials License ("RML"), the Discharge Minimization Technology ("DMT") Plan, and the Cell 4A Operations and Maintenance ("O&M") Plan. Denison is currcntly in the process of preparing revisions to each of those documents for UDEQ approval. 2 OENISOJ) ~ MINES c) During the tailings survey measurement performed at approximately 8:50am on June 18,2010, the wastewater pool elevation in Cell 3 was measured to be 5,602.96 fmsl, compared to the current freeboard limit for Cell 3 of 5,602.50 fmsl, representing an exceedance of 0.46 feet, or 5.5 inches. d) It should be noted that the current freeboard limit in Cell 3 of 5,602.5 fmsl is 6 feet below the top of the FML in Cell 3, so the exceedance of the cun'ent freeboard limit by 5.5 inches resulted in a wastewater pool elevation that was still over five feet below the top of the FML and over two feet below the secondary freeboard limit of 5,605.5 feet set out in Part 1.0.2 of the Pennit. As a result, there was no risk of the wastewater in Cell 3 overflowing over the top of the Cell 3 FML. Also, as mentioned above, since the freeboard limit in Cell 4A has been set to accommodate the PMP event for Cells 2, 3, and 4A, there was also no risk that even if a PMP event were to occur there would not have been adequate freeboard available in Cell 4A. The wastewater elevation survey for Cell 4A perfolmed on June 18,2010 indicated a wastewater elevation 95 inches (7.9 feet) below the freeboard limit of 5,593.74 fmsl for Ce1l 4A. e) The Mill has been running on a I O-day on and 4-day off operating cycle. f) During the previous week's inspection and survey on June 11 ,2010, the survey of the liquid pool elevation indicated that Cell 3 had 19 inches of freeboard capacity (was 19 inches below the freeboard limit). g) As part of the plan to fill Cell 3 with tai lings soli ds and to close Cell 3, the Mill has been alternating between periods of pumping Cell 3 liquids into Cell 4A and discharging CCD solids into Cell 3. h) The intention was to discharge tailings so lids into Cell 3 at a rate that, given the rate solutions were being pumped from Cell 3 to Cell 4A, would not result in an cxceedence of the freeboard limit in Cell 3. Earlier in 2010, the Mi ll staff had replaced the existing pump in Cell 3 with a new pump to increase the flow rate of solutions from Cell 3 to Ce1l4A during the liquid transfer cycle. i) The Mill completed a cycle of removing liquids from Cell 3, and was in a cycle of operating and discharging CCD solids into Cell 3 at the time of the exceedence. j) Cell 3 was receiving only CCD solids and solutions from the Cell 2 slimes drain, and Ce1l 4A was receiving all other tailings liquids, at the time of the exceedence. OENISOJ)~~ MINES 3 2. Action Takcn Upon receipt of the initial survey results, the Mill's Environmental Coordinator notified the Mill Manager at 11 :55am that day. The following plan of action was immediately put into place in accordance with section 5.1 of the Mill's Contingency Plan: a) The Mill Manager had operations crews stop the discharge ofCCD solids into Cell 3; b) The Mill Manager had the new transfer pump from Cell 3 to Cell 4A tumed on; c) This plan was implemented by noon on Friday June 18,2010; d) Verbal notification was given to the Executive Secretary at 3:55pm on June 18,2010, within 24 hours of discovery. This verbal notification was followed by this written notification within five days of discovery; e) Solutions continued to be pumped from Cell 3 to Cell 4A in order to reduce the solution in Cell 3; and f) Compliance was achieved on June 21, 20 10. A survey of Cell 3 at 10:00am on June 21,2010 indicated a solution elevation of5601.28 fms!. 3. Root Causc The root cause analysis is as follows a) The Mill has been alternating between periods of pumping Cell 3 liquids into Cell 4A and discharging CCD solids into Cell 3. b) Cell 3 was receiving only CCD solids, and Cell 4A was receiving all tailings liquids at the time of the exceedence. The Mill continues to pump solutions from Cell 3 to Cell 4A before solids are introduced into Cell 3, in an effort to maintain the solution level in Cell 3 below the freeboard limit during this process. c) As a result of following the planned program of fi lling Cell 3 for closure, the remaining pond area in Cell 3 is small, approximately 7 to 10 acres, and is continually being reduced by the planned expansion of the solids beach as Cell 3 approaches its final tailings capacity. d) As a.result of the ever-decreasing pond area, the ability to manage the freeboard level has become increasingly di fficult. OENISONI)JJ MINES 4 e) Upon review of the circumstances, after the discovery of the exceedance, it is again evident that it is no longer possible to manage the Cell 3 freeboard to achieve the calculatcd freeboard limit during the final stages of filling Cell 3 with solids and closing Cell 3. The exceedence occurred despite the fact that monitoring and surveying were perfonned at the required frequency, all pumping equipment was operating properly, and the liquid transfer from Cell 3 to Ce1l 4A was OCCUlTing as planned. 4. Actions That Will be Taken to Prevent a Reoccurrence of this Incident T he following actions will be taken to prevent a reoccurrence of this incident: a) The Mill will continue to pump liquids from Cell 3 to Cell 4A, in preparation for dewatering and closure of Cell 3; and b) Denison will complete and submit draft reVISIOns to the documents identified 111 UDEQ's Apri l 19,2010 letter by July 15,2010. s. Affirmative Defense Denison believes that the affirmative defense in Part 1.0.3.c) of the PClmit should be applicable to this incident, for the fo llowing reasons: a) Notification By virtue of the initial oral notification given to the UDEQ Duty Officer at 3:55pm on Friday June 18,2010 (within 24 hours of the discovery) and this written notice, Deniso n has submitted notification according to UAC R3 17-6-6. 13. b) Failure was not Intentional or Caused by the Pennittee's Negligence The exceedance of the freeboard lim it was not intentional or caused by Denison's negligence, either in action or in failure to act. The Mill was taking actions to manage the freeboard requirements of all of its active tailings cells whil e filling Cell 3 to its final tailings solids capacity in preparation for closure. Based on a survey of the wastewater elevation in Cell 3 taken the previous week, it appeared that there was ample freeboard in Cell 3, and, based on past Mill experience it was not unreasonable for Mi ll staff to come to that conclusion. The fact that the water level in Cell 3 increased at an unexpectedly fast rate was due to the planned discharge of CCD solids into Cell 3 coupled with the issue of managing liquids in a pool of ever-decreasing 5 OENISONI) ~ MINES size as the solids fill the cell. This discharge, and the pool's size reduction, are necessary to complete the filling and closure of the Cell. c) The Pennittce has Taken Adequate Measures to Meet Pennit Conditions Denison has taken adequate measures to meet Pennit conditions in a timely manner. The provisions of the Mill's Contingency Plan were implemcnted immediately, and the wastewater levels have been brought back to within the freeboard limits. d) The Provisions of UCA 19-5-107 Have Not Been Violated The provisions of Utah Code 19-5-107 have not been violated. Therc has been no discharge ofa poll utant into waters of the state. Denison has not caused poll ution which constitutes a menace to public health and welfare, or is harmful to wildlife, tish or aquatic life, or impairs domestic, agricultural, industrial, recreational, or other beneficial uses of water, nor has Denison placed or caused to be placed any waste in a location where there is probable cause to believe it will cause pollution. There was no discharge of solutions from the Mill's tailings impoundments, and there was ample freeboard in Cell4A to accommodate the PMP for Cells 2,3, and 4A. Please contact the undersigned if you have any qucstions or require any further intolmation. Yours truly, f1112~" JUeJJ'~ ~: :~-;ischl er Director, Compliance and Permitting ce: Rich Bartlett David C, Frydenlund Ron F. Hochstein Ryan Palmer Harold R. Roberts David E. Turk OENISONI)~~ MINES 6 Attachment C Monthly Cell 2 Slimes Drain Water level Over Time MONTHLY HEAD MEASUREMENT TEST Location: Date: 4/12/2010 Slimes Cell # 2 Sampler: Tanner Holliday 4/5/2010 4/6/2010 4/7/2010 4/8/2010 4/9/2010 4/12/2010 600 700 20.83 15.38 13.81 12.78 11.89 lOA 800 20.37 15.29 13.78 12.76 11.88 10.4 900 19.93 15.2 13.75 12.7 11.85 10.4 1000 19.58 15.09 13.7 12.67 11.83 1100 19.23 14.99 13.66 12.62 11.8 1200 18.85 14.9 13.62 12.58 11.77 1300 18.57 14.81 13.56 12.51 11.73 1400 18.21 14.73 13.5 12047 11.69 1500 17.93 14.65 13.44 12.39 11.64 1600 Comments: Additional readings were taken over the weekend, each day had one reading taken. On the 10th the level was 11.41 the reading on the 11th was 10.77. The report number was 10.4 for the month of April. MONTHLY HEAD MEASUREMENT TEST Location: Date: 5/19/2010 Slimes Cell # 2 Sampler: Tanner Holliday, Ryan Palmer 5/10/2010 5/11/2010 5/12/2010 5/13/2010 5/14/2010 5/17/2010 5/18/2010 5/19/2010 600 700 17.29 15.06 13.87 13.07 11.35 10.78 10A3 800 17.08 14.98 13.85 13.04 11.34 10.77 10.43 900 16.93 14.90 13.82 13.00 11.32 10.75 10.43 1000 16.75 14.85 13.8 12.96 11.3 10.72 1100 16.60 14.79 13.75 12.93 11.27 10.7 1200 16.47 14.72 13.71 12.90 11.24 10.68 1300 16.34 14.66 13.68 12.85 11.21 10.66 1400 23.64 16.23 14.60 13.64 12.82 11.17 10.65 1500 22.95 16.13 14.54 13.59 12.80 11.13 10.62 1600 10.43 Comments: The report number is 10.43 When the slimes test was started it was found that the main breaker was tripped. It was determined that the breaker couldn't have tripped to long ago based on the first depth reading of 23.64 MONTHLY HEAD MEASUREMENT TEST Location: Date: 6/30/2010 Slimes Cell # 2 Sampler: Tanner Holliday Garrin Palmer, Ryan Palmer 6/21/2010 6/22/2010 6/23/2010 6/24/2010 6/25/2010 6/28/2010 600 700 23.37 14.97 13.3 12.31 11.56 10.13 800 22.11 14.88 13.25 12.29 11.56 10.13 900 21.36 14.80 13.21 12.26 11.55 10.13 1000 20.66 14.71 13.16 12.23 11.52 1100 20.01 14.62 13.1 12.19 11.48 1200 19.62 14.53 13.06 12.15 11.45 1300 19.13 14.43 13.01 12.1 11.41 1400 18.71 14.34 12.96 12.06 11.38 1500 18.29 14.27 12.91 12.02 11.35 1600 10.13 Comments Report number is 10.13. An additional reading was taken on 6/26/10 At 1120 and the measurement was 10.90. Attachment D Graph of Cell 2 Slimes Drain Water Levels over Time n CD -I + IV VI r '" s· .. -.. " ., 0 3 ~ ;::I -;0 .. CD .. 0- " "n 11\ 0 s· ~ ., c --.. 0-0 "'" "n .. QJ s· " -., ::J :::l -0 0 .. V> " -IV -., ::J c-o -ro 0 0 V> :;E -ID ., ., c--.. S20 .. ~ :;E r .. IV ., < -~ 0 ~ .... r .. 0 < ~ I-' en I;: Feet Below Top of Standpipe I-' IV I-' o 00 en ... IV 0 1/30/2009 2/20/2009 3/13/2009 4/3/2009 4/24/2009 5/15/2009 6/5/2009 6/26/2009 7/17/2009 8/7/2009 8/28/2009 9/18/2009 10/9/2009 10/30/2009 11/20/2009 12/11/2009 1/1/2010 1/22/2010 2/12/2010 3/5/2010 3/26/2010 4/16/2010 5/7/2010 5/28/2010 6/18/2010 Attachment E Cell Liner Repair Reports and Notices OENISONI)~~ MINES , June 7, 2010 VIA PDF AND FEDERAL EXPRESS Dane L. Finerfrock, Co-Executive Secretary Utah Water Quality Board Utah Department of Environmental Quality 168 North 1950 West P.O. Box 144810 Salt Lake City, UT 84114-4810 Dear Mr. Finerfrock: Donllon Mintl (USA) Corp. 1050 11111 _~ Suite 150 Do"". CO SOH5 USA Til: 303 tH·" .. '" : 303 31.-4121 www.dtnltonmlnet.cOnl Re: State of Utah Ground Water Discharge Permit No. UGW370004 White Mesa Uranium MiII-Notice Pursuant to Part I.G.3 of the Permit, Utah Radioactive Materials License No. UT1900479, and Utah Administrative Code ("UAC") R317-6-6.16(C)(I) Please take notice pursuanWO-the_P-art-I.G.3.of.the White Mesa Mill~s-(\he "Mill's") State of Utah Groundwater Discharge Permit No. UGW370004 (the "Permit"), Utah Radioactive Materials License No. UTl900479 (the "License"), and Utah Administrative Code ("UAC") R317-6-6.16(C)(I) that Denison Mines (USA) Corp., as operator of the Mill and holder of the Permit and License, failed to meet the standards in Condition 11.3 of the License, by accumulation of "sufficient fluid in the leak detection system" ("LDS") of Cell I, as described in more detail below. The accumulation of fluid in the LDS was discovered at 2:50 PM on Wednesday, June 2,2010. Sufficient fluid had accumulated by 8:25am Thursday, June 3 to permit collection of samples and initial pH testing to asceltain whether the fluid originated from the disposal cell. The initial pH testing in at 8:45am on June 3 indicated that the liquid originated from the disposal cell. Initial notice of this accumulation of liquid in the LDS was given by telephone to the Utah Department of Environmental Quality Executive Secretary at 2:48pm on Thursday June 3, 2010 (within 24 hours of the discovery and within 7 hours of determination of the origin of the fluid). 1. Facts and Background Information a) Condition 11.3 of the Mill's State of Utah Radioactive Materials License No. UTl900479 (the "License") requires that licensee implement a leak detection monitoring system for each of the tailings cells. According to condition 11.3: (i) The licensee shall measure and record the "depth to fluid" in each of the tailings disposal cell standpipes on a weekly basis. If sufficient fluid is present in the leak detection system (LDS) of any cell, the licensee shall pump fluid from the LDS, to the extent reasonably possible, and record the volume of fluid recovered. Any fluid pumped fi'om an LDS shall be returned to a disposal cell. (ii) If fluid is pumped form an LDS, the licensee shall calculate the flow rate by dividing the recorded volume of fluid recovered by the elapsed time since fluid was last pumped or increases in the LDS fluid levels were recorded, whichever is the more recent. The licensee shall document the results of this calculation. (iii) Upon the initial pumping of fluid from an LDS, the licensee shall collect a fluid sample and analyze the fluid for pH and the parameters listed in paragraph A of this license conditions. The licensee shall determine whether the LDS fluid originated form the constituents listed in paragraph A of this license condition or has a pH level less than 5.0. If either elevated constituent levels or a pH less than 5.0 is observed, the licensee shall assume that the disposal cell is the origin of the fluid. The above requirements have been incorporated into the Discharge Minimization Technology Plan in Section 3.1 of the Mill's Environmental Protection Manual. b) Condition 11.3 further requires the ongoing weekly measurement of depth to fluid if the calculated leakage flow rate is less than 1 gpm, and additional notification and mitigation requirements if the leakage rate is greater than 1 gpm. c) The Liner Maintenance Provisions appendix of the Mill's DMT Plan describe the types of repairs that will be implemented following identification of a leakage source, as well as requirements for a repair report describing the nature of the damage and the repairs. d) Section l.G.3 of the Mill's groundwater Discharge Permit (the "Permit") requires thatin the event that the Permittee fails to maintain DMT or BAT or othelwise fails to meet DMT or BAT standards as required by the Permit, the Permittee shall submit to the Executive Secretary a notification and description of the failure according to R317-6- 6.16(C)( 1). Notification shall be given orally within 24-hours of the Pennittee's discovery of the failure of DMT or BAT, and shall be followed up by written notification, including the information necessary to make a determination under R3l7- 2 OEN ISOJ)~~ MINES 6-6.16(C)(2), within five calendar days of the Pelmittee's discovery of the fa ilure of best available technology. e) During the routine tailings inspection perfonned at approximately 2:50pm on June 2, 2010, the Cell 1 LDS standpipe was observed to have accumulated approximately 7 feet 6 inches of liquid compared to the previous day. The preceding day's recorded observation indicated that the LDS standpipe was "dry" (a measured level of 63 feet 4 inches). f) Liquid levels in the LDS standpipe measured from the time of the initial observation to the time of this notice were as fo llows: Date Time Conditions Approximate Depth Calculated to Liquid Level Leakage rate 06/2/20 10 14:50 During routine 55 feet 10 inches inspection 6/312010 08:25 Before pumping 55 feet 6 inches standpipe 6/312010 08:42 After pumping 63 feet 4 inches standpipe (dry) 6/3/2010 09:30 Before pumping 61 feet 9 inches standpipe 6/3/2010 09:33 After pumping 63 feet 4 inches 0.48 gpm standpipe (dry) 6/3/2010 14:05 Before pumping 58 Feet 8 inches standpipe 6/3/2010 14:10 After pumping 63 feet 4 inches 0.17 gpm standpipe (dry) 6/4112010 07:50 Before pumping 57 feet 0 inches standpipe 6/4112010 07:59 After pumping 63 feet 4 inches 0.05 gpm standpipe (dry) 6/4112010 14: 11 Before pumping 57 feet 5 inches standpipe 6/4112010 14: 17 After pumping 63 feet 4 inches 0.14 gpm standpipe (dry) 617120 10 10:25 Before pumping 56 feet 6 inches standpipe 61712010 10:31 After pumping 63 feet 4 inches standpipe (dry) OENISOJ)JJ MINES 3 g) The result recorded from an initial pH paper check on a sample of LOS standpipe fluid was a pH of approximately 2.0 to 3.0. 2. Actions Taken Upon receipt of the initial inspection result, the Mill's Environmental Coordinator notified the Mill Manager at 3:00pm that day. The following plan of action was immediately put into place in accordance with the Liner Maintenance Provisions and Section 3.1 of the Mill's Environmental Protection Manual: a) In accordance with License condition 11 .3, pumping of the LOS to dryness, and monitoring of level change with time to estimate leakage rate, began at 8:25am on June 3; b) In accordance with License condition 11.3, the calculated leakage rates estimated since the initial identification of the leakage have not exceeded I gpm c) In accordance with License condition 11.3, an initial pH paper test to detelmine the origin of the liquids was performed at 8:45am on June3. The pH paper indicated an approximate pH of 2.0 to 3.0. Based on this result, it was determined at 8:45am that the LOS liquids originated from the Cell I liquids; d) In accordance with License condition 11.3, upon the initial pumping of the LOS, samples and duplicates were collected and shipped to Energy Laboratories and America West Laboratories on June 3 for analysis for the full suite of groundwater point of compliance analytes and parameters; e) Consistent with Section 1.0.3 of the Permit, verbal notification was given to the Executive Secretary at 4:48pm on June 3, 2010, within 24 hours of discovery of the liquid level and within 9 hours of initial determination that the liquids originated from the cell solutions. The verbal notification was followed by this written notification within five days of discovery; f) Solutions continue to be pumped from Cell I to Ce1l4A at the time of this notice. 3. Actions That Will be Taken to Prevent a Reoccurrence of this Incident The following actions will be taken to prevent a reoccurrence of this incident: a) The Mill will continue to monitor the rate of leakage into the LDS; 4 OENISOJ) ~ M INES b) The Mill will continue efforts to identify the location of any tear(s) or other so urce(s) of leakage; c) Once the Mill has identified the location of the tear(s) or source(s) of leakage, any leak, hole or other damage will be repaired by installation of a PVC repair patch, in accordance with the Liner Maintenance provisions appendix of the Mi ll's DMT Plan; d) A repair report containing a root cause analysis and further recommendations will be submitted to the Executive Secretary within 30 days of the initial telephone notification. 4. Required Reporting As required by the Liner Maintenance Provisions appendix to the Mill's DMT Plan, a repair report will be submitted to the Executive Secretary within 30 days of the initial telephone notification. The repair report will contain, in addition to a root cause analysis, the following elements: • Repair narrati ve describing the nature of the damage and the repair work completed to repair the damage. • Repair material type used to complete the repair • Repair material description • Post repairs test specifications • Test Methods (ASTM or other) • Daily reports during the repair work • Repair test results • Quality Assurance/Quality Control Information 5. Affirmative Defense Denison does not believe that any violation of the Mill's groundwater Discharge Permit, Radioactive Materials License, DMT Plan or Liner Maintenance provisions appendix has occurred as a result of this leakage identificat ion. If any potential violation were to be identified, Denison believes that the affirmative defense in Part I.G.3 .c) of the Pelmit should be applicable to this incident, for the following reasons: 5 OENISONr) ~ MINES a) Notification By virtue of the initial oral notification given to the UDEQ Duty Officer at 4:48pm on Thursday June, 2010 (within 24 hours of the discovery) and this written notice, Denison has submitted notification according to UAC R317-6-6.13. b) Failure was not Intentional or Caused by the Permittee's Negligence The LOS liquid level was not intentional or caused by Denison's negligence, either in action or in failure to act. The Mill was identified the level change during a routine daily inspection designed to indentify liner performance issues. The Mill has not changed the method(s) of use of use of Cell 1;. c) The Permittee has Taken Adequate Measures to Meet Permit Conditions Denison has taken adequate measures to meet Permit conditions in a timely manner. The provisions of the Mill's DMT Plan and Liner Maintenance Provisions Appendix were implemented immediately, and steps to identify any tears or other repair requirements are already underway; d) The Provisions of UCA 19-5-107 Have Not Been Violated The provisions of Utah Code 19-5-107 have not been violated. There has been no discharge of a pollutant into waters of the state. Denison has not caused pollution which constitutes a menace to public health and welfare, or is harmful to wildlife, fish or aquatic life, or impairs domestic, agricultural, industrial, recreational, or other beneficial uses of water, nor has Denison placed or caused to be placed any waste in a location where there is probable cause to believe it will cause pollution. There was no discharge ofsolutions from the Mill's tailings impoundments. Please contact the undersigned if you have any questions or require any further infonnation. Yours~ L~L ~nTischler Director, Compliance and Permitting 6 OENISOJ) J M INES cc: David C, Frydenlund Ron F. Hochstein Ryan Palmer Harold R. Roberts David E. Turk 7 OENISOJ) ~ M INES Attachment F Annual Decontamination Pad Inspections Attachment F-l Inspection of Existing Decontamination Pad White Mesa Mill -Standard Operating Procedures Book II: Enviromnental Protection Manual, Section 3,[ APPENDIX A (CONT.) 3/10 Revision: Denison-9 Page 35 of 46 ANNUAL DECONTAMINATION PAD INSPECTION Date ofInspection: ~ ~ ~() Inspector: ~Ai _~11¢~_ New Decontamination Pad: Are there any cracks on th h d / ewas pa surfacegrea!erthan 118 inch of separation? _YesXNo Is there any significant deterioration or damage of the pad surface? __ Yes ~ Fndings: S",.wtt _~c... I. " $kLt /57<1117~ ~h) /MJ :J,4f/"'?~ Existing Decontamination Pad' -;::z::;;: t ,.,... I ~ /' . ~ , "'-;' .. <A.<-'<J'< ~ :-H'",-f -, '" ..L ~ / ~<"(/'~.,tr !?CU''''{'~./. Were there any observed problems with the steel tank? __ Yes __ No S~,p'{ .-1k..r """" Findings: Repair Work Required: ,}.:I.o #'1' ft~ f b£< /"j ~( ,4,r!7,(w,,"-- 1!1:1k/, ;lJ./.t.//.:i fr,J j,,;ilk-~< l/_.4< 'tlJ;1.4);, .!Jf7 P4 Llu Aj .)4Jt/ ,.J: 1)A"if'~ H/ 15",,,/( \ \ \ ------ ... _-- -_.--" .....---- ------- • New Decon Pad 5/14/10 Center Holding T ank-from south edge - • • • • • • • • .. • • • -• • • • • • • • - • • • • • • • • • • .... • • -• -- • • • • • • • • • • • • • • .. • • • -, • • • • • • • • • • .-• • • , • • • • • - • • -• • • • • • • '. • • • • • • • • • • • • • • • • • · ". .. , • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • , . - • -• • • • • • • - • • • • • • • • • • • • • • • • • • • • • - • • • -• - • • • • .. - • • • • • • • • • • • • -• • • • • • • • • -• New Decon Pad 5/14 /10 Close up of minor crack wash pad surface . • • • • • • • • • • • • -- • • .. - • • • • - - - • • • • • • • • • • '"-' • - • - - • • .. • • • "':-----• • .. .. • • • • • , - - - • • • -, • • • • -/"'" -I .. / • - • • • • • • • • • • • • .. • • • - • , • • -- f~-- • • • • • • • • • • • • • • • • • • • • • • • • • - --• • • • • .~ .. :... ,,/ ~'-. --- ,_~,f . , -~ ,,/ - • • • • • • • .. • • • • • • • • • • • • • • , • • • .. • • • • • • • - • • • • • • • • • • , , • • • • • • • • • • • • • .. .. • • .. • • • • • • • • • • • , • • • • • • • • • • • , • • • • • • • • • • • • • • • • • • • , . , • • • • - -• .. • • • • • ew Decon Pad 114/10 • - • • • • • • lose up of minor crack in wash pad . cation uncertain . • -• • • Decon Pad o - otal View of Wash pad. view from north king to south. - . - ew Decon Pad , , -' -" - , - 0. ~ • , • • • • " .... " • orther Capture Tank (Recycle T ank)- . from west • • • -, . 01. • --• • - • • • • , • , . • • • -• -, • , • • • • • • • • • • ew Decon Pad 114 /10 ecycle Pressure Tank-north east ide of wash pad. view from north . WATER HEATER 480 VOLTS r WATE PUMP 480 VOLTS ew Decon Pad ain Electrical Housing. Located on orth East side of Wash pad . View from e South HIGH VOLTAGE ..... VOLTS - 480V PANEL 480 VOLTS HIGH VOLTAGE . - ew Decon Pad 114/10 - GATE OPfflER in Electrical Housing-located on F- orth east side of wash pad . view rom south. -. -. , • -.~ • "" IT" y , ,.. • , --. I -' '. , • • • ~ • -, ., -f'-I I • • " .' • , 7 r / • .. -r'..J. . ~,.. , " . :J'. ~" -. ... , , -. ~ • • ,; • • • -- , • ~ • l - - '" I • • • • ... • - "'I(.~, • • • • -. ,~ • • • - --';. :"<--. • , -• _.-r • - • , • • • • • - • • • • • • • ..... ,. -- -• v - • • • ';..0, • • -• :y-• • • " • J • • - w Decon Pad o , -• • • ~. -- , ~ ~ "--. - - East Corner of Pad-Minor sion . view from East .~ - , - " . , • ..,..' ,. ~-. .. do • \ -" . -' . - < - ~---".. --' -'-_-c -~ , , . ---; ~ -. ... $-"'...A. • ". • . " ., • • --. . . " .: -....... ew Decon Pad 14/10 ash pad discharge points and ern capture tank-North ... " .... , • • ,. -. • • • • • • • - • • • • • - • • , . ..1. . • • • • • • • • • '. 1 • • • • • • • • • • • • • • • • • • • • • J • • • • k!.---..--. ~ , , >' I< • • • • . .... • • • . ~ew Decon Pad 14/10 , , ash pad discharge location- looking North - • --" . • .. . - --- - - • .- - -- ---- • • • • - - - • • • • - - • • - • • • - • • • • - • • • New Decon Pad 5/14/10 Wash Pad-from south end . looking to North ------.-----~------------- • • • • • • , • , , , • , • • , I • . j • • • , . • • , • . ,.,!. I , , , I , • , • , • • ) • , ( • • " I "-., • • • • • .. -• • • ~-, • • • -, . . -• • • -. - • • • ·f .. • • • • • • • • • • • • -•• , • • - • -- • • • • • • - • -, -. -• ---- • • • • • • • .. • -- " - • • •• • • -- , • • · -- ... • • • • -0 • • -~' .. • '~.' • .' - • • • --. .- • • • -, , • • • • • • • • • • • • - - • 'i1'" '. • .. • , • • • • • • -, • • • • • • • - • • • -- • • • • , • • • -• • • • • • "- • • • .! ,- •• • . ( • , .- • 10. '"I ... . • • • • • • • • .... • • • • New Oecon Pad 5/14/10 Close up of popped Cement • • • • • o • • • • o , • • • • • • • • • • • • o o • • • o • • , • o , " • • • o. • • • • • , , • , • • o • • • • • • • , , • • • • • • • • • , " • • • • , , • • , o • o , • • , • • o '. • • , • • • • • , o • • , • o • • • • o • • • • • o • '. • • , • , 22 • , . , , " • .. , • • • , • • • • • • o • , 0 • , , • .. , , • • , '. o • • • , • , , • • • • , , • • • , , , , , • o o • • • , , • o , • • , • • • o , • • • " , • 0 , • • • o , • • , • • o • • • o • • • • - o , • J -• • o , , • , , • o , • , , , 0, • • • " o , .' o o • • , • o • • • • , • • • , • • • o • o , • • o , , • , • • o • o o , 0' • • , • o • o • • • o , • o • • • • o • • • , • , , • • o o • • • , , • • • • o -• , • • • o o , • • o • , , , , , o • • • • 0 o • • • o o , o • , • , • , , , • New Decon Pad 5/14 /10 • • , • , , , • - , • , , • • • • • • • , • • • , • o • o , • • o o • o , • o • , • , o • • , -, • • , . • Small crack running east to west on the west side of wash pad, view from north , • • o , . • • • , • • • , • • • • • • • • • • • • • , • • • • • • • • • • • , • • • • • • • • • • • • • • • • , • • • • \ • • • • • • • • • • • • • • • • • • , • -• • .' • f • • • • , , • • • • • • • ... • • • • • • , • • • • , • • • • • • • • • • • • • \ • • • • • • • • • • • • • • • , • • " , , • • • - • • • \ • • • • • • • • • • • • , , • • • • • • • • • • , • • • • • • , • • • •• • • • • • • • • • • • • • • • • • • • • • • • , • • • • • • • • • • • • • • • , • • • • • • • • • • • • • • • • . , • • • • , • .' E " .. • • • , • • • • • • , • • • • • • • , • • • • • • • I • • • • • • • • • • , • • • • • • • • • • , • • • • • • • • \. , • • • , • • • • • t. • • • • • • • • • • • • • • , • • • • • • • • • • ". • • • • • • • • New Decon Pad 5/14/10 Close up of Crac k on Wash pad Surface . • • " • • • • • • • " • " -, .' • • • , . • • , • , • • - - • • - Decon Pad • Down Troughs-View from North • , • • r , .M' ,,<~ " . •• • , '" . ~ . • . ' - • - • - • • • -• -• I • --. • .. .-• • • • • • • • - • • "" l • '. • • • • • • • • .~; • • Old Oecon Pad 4/13/10 Enterance of Wash Pad-View from North East Attachment F-2 Inspection of New Decontamination Pad White Mesa Mill -Standard Operating Procedures Book II: Envirorunental Protection Manual, Section 3.1 APPENDIX A (CONT.) 3/1 0 Revision: Denison-9 Page 35 of 46 ANNUAL DECONTAMINATION PAD INSPECTION Date of Inspection: US· 2dld Inspector: -4"'/ ~N./::-=---_.L!:! U'Af,!:..IIt.e:=t2.==>-. _ New Decontamination Pad: Are there any cracks on the wash pad surface greater than 1/8 inch of separation? _Yes _No Is there any significant deterioration 01' damage of the pad sUlface? __ Yes __ No Findings: Repair Work Required: Existing Decontamination Pad: Were there any observed problems with the steel tank? __ Yes ~ • • • • • -• • • • • • • • - • • • ( • .- • • • .. • .. • • • , -"" ... -.. .. ... .. \ . • • • .' • • • • , , • • • , • . ' " . , • • • •• • • • • • • • • • • • • • • • • • • • • Id Decon Pad /13/10 • • • rflow Containment-Veiw from ast side of containment. " - . " . " • • • ,; I - , .~ • • . ,. ..... -t ... · . • • • • • .... : -• -"-'-. - • , - • • • • " • '. . . .. ... , .. ... ' .. ........... . \. , ! -. • .... "'t. . ,~ , ~ ) • " • , . • , • • ,. • •• 'L , ... • • , • , , , • , '.' , • • • t \ • , , .. . , • • , , .. .(,'-"~ .' •• • • • • • , . , , , . t o·· < • , " . ~ , • • • • \ • , I . , ,\' • • , • • • • - • • • • • • , , , .. • , . ' . , , , , • 1 , • • • • • • , • I , • /:' • • • , • ..... :-., • • • , " , i( • , I " , , I • .. • • • , , .. • • • • , • , , . • • • • • , . .... , • • , • • • .. • • , • • , , ....... ~ "." • • , , I • • • 'I , \ • , I • • ( • • Did Decon Pad 4/13/10 Overflow Drain pipe dishcarge point-view from East • • • • • • • --.... ~ ... • ~- • • • .- • I. • • • • • • • • • • ~ • • • • -• • • ..... -I . "-....... \ . '\'\ . .~ ~ • , • • '-. .~ • -• • ~,:: ... --,. . . -, " . , " • • • • '. , • " . • --- " " "-- , , , " - • > Old Oecon pad 4/13 /10 OverflowlT ransfer val ve discharge in Overflow containment. view from south • , ... - -... " • • - • , • , , -.. , • - • • • • -\ . • • • , 0 , ~ l 0 , -' . ' • (. , • • -• • 0 "' , • • • • • • • • , • , .\. - • I • -t: o • o • . , '. o • • • • d Oec[Jn Pad 3/10 II", rfl [JW C [J nta i n m e nt. L[J C ate d [J n S [J uth st side [Jf Oec[Jn Pad. View from [Juth east. • •• --, . , • /" I -~, .. ~. ...... '-'., ,. . ;0'", . '"" ~-«i -~ _, ~A. ~,(o"' Dverflow/T ransfer valve-Located on south side of capture tanks. . w from south. -. ---- d Oecon Pad /13/10 lose up of overflowltransfer Ive. view from south. • • • • , . ' . • • , • - " ~ .. '- " .. . , , .. - • • • • I '\. .. e:' • • , ~.' • • - , • - • • • - -• • • ..... , " , , • , • -- ... :-.... r . '-. · , ' .. ~4r ~ -, ..... , • • • ., ...... 'Ii. , '-< ' .. • " -.1'. .. • • tl . , • t ... ~ ~ .. '" .. ... , . , . • 1..-• , • , I .. , • • • , • , " . , . , .. \. ,. ~ .. • ...,-l .- • ... -• , " • • --...... . . -:,"," (. . '\.. , • • • " ' .. ; . , , " • • • " ., , · ' .' • • " ' . ·,.r \-'l;-, .... , , • , i .. 1 .• ·· · , .•... • ....... ~-'L • . ' • • • , , • • • • • • , '. '. .. • • I .. • " , • • , • • l , . ' • • -, '. • , -• , • , '1.. • , , , . , - • ... " L' • I , , ' • .-, ~. , , ~ ...... , . , " • • I .. , L-": • ,. 'i • • l · J'" l , , ',.,. , • • -• • , _______ J __ " __ • • ~ I. 't . , · ' . . • .'. .... • , • ,r ... • " • • .¥ , ~ • L • '. • • , . -t . ... '" • I •. . .. • .' • • • • ... " , , .. \ .. 1.. ." • , • • • . , ',~ -<=~. ....." '." .:..'. ~ '. '~ .. , "'.~.' '" " . " -{ .. ,-, , . " , ,. • • , ••• " . < ' , • . I • , , , · , , . , ~,:-';" ~. .. ~ • " . ,. c. , ,. , . \ 'r, : . .1 1; \ ,,,, , ~ . :., .\ \\. , , "'", ... ., I.. ~ • , ~ I , , • • • • • , . ". , • • I.. I , • . , ' .... .., \ , .~\ \ .. , • • , I • , , • • • t .. ., ) ~, , • • , • • , " , " Did Decon Pad 4/13/10 Transfer valve on East capture tank. View from the south. I J I I / I • • / / • { , I I I , ? • I I ;r , / -I / • -- 1 " " , , • • • .0 • • .--. , , , .. o • ~ -• - • • . .,..I • .. o • • • • "0 • • • • , . '" • 01 j • -• • • - o • • • • • • • • , • • - - / • ~ ,:;::: .... ""~ .. . ... \ ...... ,.. .... "'t .......... ,. '.: ~.\"--4 • • , " .. • • • • • • o • - o o • • • • • - Old Oecon Pad 4/13/10 • Ove rfl ow c a ptu re pip e -in sta 1 ati 0 n in process. view from the west. • ... -; • Did Decon Pad 4/13/10 • Wash Pad-Center of pad looking West. • , • _uld Decon Pad /13/10 , --~ outhern Catwalk-Veiw from orth East side of Wash pad. • . 1 w •• .. o. • , , • '. • • • • • • • o ... , ' • • • • . " -• • w - • - • • • ;:P ... .... .. • • • • • ....... , -.... o • , . , ' .. o o • , " • L ,I:;:::. .... . • • • -• · , . ' , • • • • :. ,. ~. ;, .. t:i.P . , • • • '. ...... , ,. . • .' Ow -o -. .. • , , , ." -.. • • • , . ' - • • , • • • , • • • • • , • • . ; • • • •• • • • , " • . ' .. ~ '". • • ' .. -, . • • • , • .. .' "':'.-.. -'. • " , , • o • • • • , • • .. -, ,. -. • o .. .- • , , • • • " • • • • • • • • • • .J '0 • • ' . • • , • , • & ..... • • • , , • • - • • , • • • " Old Oecon Pad 4/13 /10 Enterance of Wash Pad· East enterance. iew from west. • • • • • , I , • .\.. , Did Decon Pad 4/13/10 Sealed Cracks on wash pad surface. • . ~ • --- • • • • • -• • • • • • . • • -. • • - • .~-----• • -. '- -" ---• • • ~ -• • • -• • • .. • • • • • • -" • -... --. -, -. -.--• • • • , • , • • • • • . ..... -. • •• • • • • - • . . • • • - • • • • , - • - • -• • • . . -c.-.. _-~ ._-- • , , - • - • • • .- • • • • • • • • • • • • • Old Oecon Pad 4/13/10 Wash Pad-View from west end/ exit end -- J • \ \ . , • .~ '. y \ • • , , I -, , I • < • ( • , • / ., . • • • • • • '> I / --. • • )- \. • • r / - ( . I ,~ - I - 1 t , / - ., <" .' j I; ~ • ~ .". • Id Decon Pad /13/10 ,. - -J • • - I • • I • • estern Capture Tank (Recycle ank), view from East edge • • • • • • • • ,- , • -- • ~ • oJ' • ". ~ , • • • • ,~ • • · ... -. , ",' •. & ... • -." ~ #' • .'...-- " oJ • .' • • -. . . ...... -, " :" • .' " • • • • • • • ., ~ . • • • • • .J • • "- ... ., , ." , . -, " . • ........ • • ,,' ..... • • .. • .... ~" . .. . .. . .' • • ~~ , .... """ " - ....... ' .. " " .. • • ): : , '. • • • • • .... ., " • , • • • • • • • • d Oecon Pad 13/10 ischarge Canal. Located at east nd of wash pad. View from west Attachment G Ce1l4A Leak Detection System Data for the Quarter Cell 4A LDS Monitoring Information April 2010 Date Measurements in Inches Flow Meter in Gallons 4/12/10 6.7 257250 4/9/10 7.7 257250 4/16/10 7.7 257250 4/23/10 8.3 257250 4/30/10 8.3 257250 Highest level for the month was 8.3 inches. Total number of gallons pumped was O. May 2010 Date 4/12/10 4/9/10 4/16/10 4/23/10 4/30/10 Measurements in Inches Flow Meter in Gallons 6.7 257250 7.7 257250 7.7 257250 8.3 257250 8.3 257250 Highest level for the month was 8.5 inches. Total number of gallons pumped was O. June 2010 Date 4/12/10 4/9/10 4/16/10 4/23/10 4/30/10 Measurements in Inches Flow Meter in Gallons 6.7 257250 7.7 257250 7.7 257250 8.3 257250 8.3 257250 Highest level for the month was 9.0 inches. Total number of gallons pumped was O. For the 2nd Quarter 2010, the highest level was 9.0 inches and a total of 0 gallons were pumped. • , • , • 1 • • • , , , • • f • • • , • • -• • " · I , , • , • • ... , • , , ,'f· " • • • • , , • .. . .. • • ",.',. , , ....... ~ .. ~ ~ • , , • , , . ,. • • , • • • , • · , • " I '1':"> , .,. • I ,. , '~. \ .. .P.' .: ,~. ,.t; " 1 t ( , . 1 , , ' " ',f r , , · I , , • • , .' • ; t''' , • I • • , , . ' • • ... • , • • , t , , • · .. , '. , , . , • • • ~ /. • , , j , , " . , • • } , 'lI ., t , 1". ... I • · ' ,. " • ' . • , , , • .J • • · " ., ' -~' • • , .. , , .. • f , • ,. , ·~·I ; " l\ • .. ' .. • J" , • • . ' " , , , (" • • ). • " • ...., ... I . , , • 1 • • • • , · " • • , I , ') ~ , ., - , • , • ~ " . ",'~ , · . ' • · ,~ • •• • .' • , : •. / : '\ .., , -to ' • --'-.' , • • • • • • .I • , . ' . " ' • ... • ., , { , 1\ y, , • • • • • • • ""I, -/ , • . " , -I-. ",' .-.' . • . . ' f • , • ,,. , , · • • , • , , , • , " • , , ( , , , • • • • ",.r A'· I , ~' , -. , , , • , • • , , 'It , ...... , r, ~ " ~ , • , \ , f . " It'" .. , . .~~. ".' I _ " .,. ~'" . .,. '. ~ . , "., \ .".'" -I .. • , • " , • • ' . , , • • • J . .,. .. , • . , , , ., .. I " • '., . , , , • , , , , . • ' .. , '. , • --_." ,----'=----" I ' ... J .... '. • • , , , • , • • • , , , • , , • I • , • • , • , , , .. ~ , ' . , . . . , " , .. . .. ." • J \ > .. ;. • • / • I , • • • • .? I . , ,,* :~""1 · -.,-" ", , '. , , , I • , , • • , , I • , , , , ,)' .~ • :~ .. , ....... '\,.. . . , ... .\ . . , .. , •• • , " • • ~ .. '" ( ) • • I ' , " .. , " , • r ,', , 1 , • • • , -, , ' • • , ' , , • • , • , • , , , , • • • • • J '" • • • . , • • , " , , . • • • " . "1 • • · ~.: ...... --, . -,~ ./. 1,.... • • , ' • • • '. ' .. • , , • I , • • • • , • l , I I I • " , • • ., . ., • • 7 ". ,',1 t . • • ''2: .... "-. . " . ,~~, ". ~ " '... ... :"'-"'" '0' ~. " .. , " J~~ '.""".l , , ., .... , -' • • • • • , , • , • , , , , • , '. , , • ~~'" • , ' .. I '" • ! , , • •• . , , • • ." .. , • • , . ., , • T .1-:," /' I • • '! .. • , , I , • I.' I \.. • " • -. , " - , , , , '0. . , ~ .. , • • , , , • .. _""'" ... ' . .' 17 l • • • • , , • , ,\J , 1 ,. , • , • • • • , . ",':': ' . , " " J::""'\ ,I , ",' ( , I • ). I I • , , )., ., ,. ,., -, /. " 1 ~_ ""'~.., _ " , t.'·-\ .1--, , ,'~ '\' · ... ~ / -~ , . ~' , ,. .. , _ ... . 1 '" .... ., " , .... , '\ • -~ -. , -, ~." ~-' ...... "t, .,.,"" .... ::1 T 1 . ' .,_., ...... • , .' 1 '...... '-'--..... " " .. -. ~\ ... .., .. J '-' -, 1'·., '.-.. \' ........ .. ~. • , , ." ,,-, • , '. ~ \ , ..., , .... • ... , -.... . , , - • >-. " • .' .,' .. ". , , , , • • • , . .. ":~ ~.,.~ , " • • • • • , -, • , • Old Oecon Pad 4/14 /10 Ove rfl ow 0 ra in, N e a ri n 9 com p 1 eti 0 non West end, View from East. - , • • , • • , • • • • • •• • .... .:,1~ '" . • • • • \.'. . .. , , , • • · ~ • • .' • , • • • .' • ••• • • • .. o • . , , . • o • • • o • .;: , ' .. • • , o , • • . , - • o . , . . 0, • • • • " • • , o • , • • • • • • • • • • , . r O ' • ... " , . " • • •• • , • " . • • • , • , .. ~) • • • , -, . '0 , o • • o • • • • , . " -0 ' • f' • • • • • -, . • • • • ' .. • .. . • • • • • • • • , • • • • , ~ , • , , • · ' , • • • • , , t , • '-'. , • • o • o , , • • • , • • , • • • , • • o "0 o , ,0 • • - • • • • , • ., • ~ -- • • • · -' - , • • • • • , • o • • , , '-..:-, ' , ,-"-, • • • • • , , , \ • • , • • . , • , • • .. 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' o 1 ' . • •• , ' .. ~ • , , • • • • , , ')' ... , o\'. p . I' . , Did Decon Pad 4/14/10 Overflow Drain Pipe-located on West end of wash pad, view from the west. 1 .' , -, -' • ." • • • , • • • . .. . ' , -. ", , " ". , . , • • " • •• , , • , . , , , -, .... - • .... ,: , -- • , -, ,;/, • • , '~ .. . • • - " • • • --• " -, • • • .... .. 'r" . ", . , • , - ' .. -'- · -• • .... -, - , , • .' • ....... ' " . .- , " • • , " " , - , • , - . , 'I " '~t~ 'd ' 't! .• . , .~I ' -, ... • , • , • • • • , , , I ... . , .. , , • , -' • -, , • • , / • • • - -, • " , • , . '" ''j("'? -. , .,. ... . . -.... • • Id Oecon Pad 3/10 • • " • - • • • -, ~ • • • Iv"rflow c a ptu re pip e -Lo c ate don we st d of wash pad. Instalation was in cess. view from North.