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DRC-2010-004829 - 0901a068801bee7c
C-2010-004829 DENISO MINES Denison Mines (USA) Corp. 1050 17th Street SuHa 950 Denver, CO 80268 USA Tel: 303 628-7798 Fax: 303 3894123 www.d8nisonmines.com Sent VIA Federal Express August 31, 2010 Mr. Rusty Lundberg Co-Executive Secretary Utah Water Quality Board Utah Department of Environmental Quality 195 North 1950 West P.O. Box 144810 Salt Lake City, UT 84114-4820 CO 5i\ Re: Re: Transmittal of 2nd Quarter 2010 Nitrate Monitoring Report UDEQ Docket No. UGW-09-03- White Mesa Uranium MUl Dear Mr. Lundberg: Enclosed are two copies of the White Mesa Uranium Mill Nitrate Monitoring Report for the 2nd Quarter of 2010 as required by the January 2009 Stipulated Consent Agreement, UDEQ Docket No. UGW-09-03, as well as two CDs each containing a word searchable electronic copy of the report. If you should have any questions regarding this report please contact me. Yours very truly, DENISON MINES (USA) CORP. Jo Ann Tischler Director, Compliance and Permitting CC: Ron F. Hochstein David C. Frydeniund Harold R. Roberts David E. Turk Kathy Weinel OENISOJ)JJ MINES Sent VIA Federal Express August 31,2010 Mr.Rusty Lundberg Co-Executive Secretary Utah Water Quality Board Utah Department ofEnvironmental Quality 195 North 1950 West P.O.Box 144810 Salt Lake City,UT 84114-4820 Denison Mines (USA)Corp. 1050 17th Streit,Suitl 950 Dlnvlr,CO 80265 USA Til:303 628·n98 FIx:303389-4125 _.dlnisonmines.com Re: Re:Transmittal of2nd Quarter 2010 Nitrate Monitoring Report UDEQ Docket No.UGW-09-03-White Mesa Uranium Mill Dear Mr.Lundberg: Enclosed are two copies ofthe White Mesa Uranium Mill Nitrate Monitoring Report for the 2nd Quarter of2010 as required by the January 2009 Stipulated Consent Agreement,UDEQ Docket No.UGW-09-03,as well as two CDs each containing a word searchable electronic copy ofthe report. Ifyou should have any questions regarding this report please contact me. Yours very truly,~ CMIN~ Jo Ann Tischler Director,Compliance and Permitting CC:Ron F.Hochstein David C.Frydenlund Harold R.Roberts David E.Turk Kathy Weinel White Mesa Uranium Mill Nitrate Monitoring Report State of Utah Stipulated Consent Agreement, January 2009 Docket No. UGW09-03 2nd Quarter (April through June) 2010 Prepared by: Denison Mines (USA) Corp. 1050 17th Street, Suite 950 Denver CO 80265 August 30, 2010 i TABLE OF CONTENTS 1.0 INTRODUCTION................................................................................................. 1 1.1 GWDP Modifications During the Second Quarter ............................................. 1 2.0 GROUNDWATER NITRATE MONITORING ................................................ 1 2.1 Samples and Measurements Taken During the Quarter ..................................... 1 2.1.1 Nitrate Monitoring ...................................................................................... 1 2.1.2 Parameters Analyzed .................................................................................. 2 2.1.3 Groundwater Head and Level Monitoring .................................................. 2 2.2 Sampling Methodology and Equipment and Decontamination Procedures ....... 3 2.2.1 Well Purging and Depth to Groundwater ................................................... 3 2.2.2 Sample Collection ....................................................................................... 3 2.3 Field Data ............................................................................................................ 5 2.4 Depth to Groundwater Data and Water Table Contour Map .............................. 5 2.5 Laboratory Results .............................................................................................. 5 2.5.1 Copy of Laboratory Results ........................................................................ 5 2.5.2 Regulatory Framework ............................................................................... 5 3.0 QUALITY ASSURANCE AND DATA VALIDATION ................................... 5 3.1 Field QC Samples ............................................................................................... 6 3.2 Adherence to Mill Sampling SOPs ..................................................................... 6 3.3 Analyte Completeness Review ........................................................................... 6 3.4 Data Validation ................................................................................................... 7 3.4.1 Field Data QA/QC Evaluation .................................................................... 7 3.4.2 Holding Time Evaluation ............................................................................ 8 3.4.3 Receipt Temperature Evaluation ................................................................. 8 3.4.4 Analytical Method Checklist ...................................................................... 8 3.4.5 Reporting Limit Evaluation ........................................................................ 8 3.4.6 QA/QC Evaluation for Sample Duplicates ................................................. 9 3.4.7 Rinsate Check ............................................................................................. 9 3.4.8 Other Laboratory QA/QC ......................................................................... 10 4.0 INTERPRETATION OF DATA ....................................................................... 10 4.1 Interpretation of Groundwater Levels, Gradients and Flow Directions. .......... 10 4.1.1 Current Site Groundwater Contour Map................................................... 10 4.1.2 Comparison of Current Groundwater Contour Map to Groundwater Contour Map for Previous Quarter ........................................................... 11 4.1.3 Hydrographs .............................................................................................. 11 4.1.4 Depth to Groundwater Measured and Groundwater Elevation ................. 11 4.2 Review of Analytical Results............................................................................ 11 4.2.1 Current Nitrate and Chloride Isoconcentration Maps ............................... 11 4.2.2 Nitrate and Chloride Concentration Trend Data and Graphs .................... 12 4.2.3 Interpretation of Analytical Data .............................................................. 12 5.0 CORRECTIVE ACTION REPORT ................................................................. 13 5.1 Identification and definition of the problem ..................................................... 13 ii 5.2 Assignment of Responsibility for Investigation of the Problem ....................... 13 5.3 Investigation and Determination of Cause of the Problem ............................... 13 5.4 Determination of a Corrective Action to Eliminate the Problem ..................... 13 5.5 Assigning and Accepting Responsibility for Implementing the Corrective Action ............................................................................................................... 14 5.6 Implementing the Corrective Action and Evaluating Effectiveness ................. 15 5.7 Verifying That the Corrective Action Has Eliminated the Problem ................. 15 6.0 CONCLUSIONS AND RECOMMENDATIONS ............................................ 15 7.0 ELECTRONIC DATA FILES AND FORMAT .............................................. 16 8.0 SIGNATURE AND CERTIFICATION ........................................................... 16 iii LIST OF TABLES Table 1 Summary of Well Sampling and Constituents for the Period Table 2 Nitrate Percent Difference Table 3 Chloride Percent Difference INDEX OF TABS Tab A Site Plan and Perched Well Locations White Mesa Site Tab B Order of Sampling and Field Data Worksheets Tab C Kriged Current Quarter Groundwater Contour Map and Depth to Water Data Tab D Kriged Previous Quarter Groundwater Contour Map Tab E Hydrographs of Groundwater Elevations Over Time for Nitrate Monitoring Wells Tab F Depths to Groundwater and Elevations Over Time for Nitrate Monitoring Wells Tab G Laboratory Analytical Reports Tab H Quality Assurance and Data Validation Tables H-1 Field Data QA/QC Evaluation H-2 Holding Time Evaluation H-3 Analytical Method Check H-4 Reporting Limit Evaluation H-5 QA/QC Evaluation for Sample Duplicates H-6 QC Control limits for Analysis and Blanks H-7 Receipt Temperature Evaluation H-8 Rinsate Evaluation Tab I Kriged Current Quarter Nitrate and Chloride Isoconcentration Maps Tab J Analyte Concentration Data Over Time Tab K Nitrate and Chloride Concentration Trend Graphs Tab L CSV Transmittal Letter 1 1.0 INTRODUCTION The Utah Department of Environmental Quality (“UDEQ”) Division of Radiation Control (“DRC”) noted in a Request dated September 30, 2008 (the “Request”), for a Voluntary Plan and Schedule to Investigate and Remediate Nitrate Contamination at the White Mesa Uranium Mill (the “Mill”) (the “Plan”), that nitrate levels have exceeded the State water quality standard of 10 mg/L in certain monitoring wells. As a result of the Request, Denison Mines (USA) Corp. (“DUSA”) entered into a Stipulated Consent Agreement (the “Agreement”) with the Utah Water Quality Board in January 2009 which directed the preparation of a Nitrate Contamination Investigation Report and Quarterly Nitrate Monitoring Reports. A subsequent letter dated December 1, 2009, among other things, recommended that DUSA also address elevated chloride concentration in the Nitrate Monitoring Reports. This is the Quarterly Nitrate Monitoring Report, as required under the Agreement, State of UDEQ Docket No. UGW-09-03 for the Second Quarter of 2010 (the “Quarter”). 1.1 GWDP Modifications During the Second Quarter During the second quarter of 2010, the approved January 20, 2010 GWDP was revised on June 21, 2010. The revision incorporated changes necessary to address Cell 4B at the Mill. No changes were issued to the groundwater nitrate monitoring program described herein. 2.0 GROUNDWATER NITRATE MONITORING 2.1 Samples and Measurements Taken During the Quarter A map showing the location of all groundwater monitoring wells, piezometers, existing wells, temporary chloroform contaminant investigation wells and temporary nitrate investigation wells is attached under Tab A. Nitrate samples and measurements taken during this reporting period (April through June 2010), are discussed in the remainder of this section. 2.1.1 Nitrate Monitoring Quarterly sampling for nitrate monitoring parameters was performed in the following wells: TWN-1 TWN-8 TWN-15 Piezometer 2 TWN-2 TWN-9 TWN-16 Piezometer 3 TWN-3 TWN-10 TWN-17 TWN-4 TWN-11 TWN-18 TWN-5 TWN-12 TWN-19 TWN-6 TWN-13 Upper Wildlife Pond (“UWLP”) TWN-7 TWN-14 Piezometer 1 2 Table 1 provides an overview of all locations sampled during the current period, along with the date samples were collected from each location, and the date(s) upon which analytical data were received from the contract laboratory. Table 1 also identifies rinsate samples collected, as well as sample numbers associated with any required duplicates. As indicated in Table 1, nitrate monitoring was performed in all of the nitrate monitoring wells, the UWLP and Piezometers 1, 2, and 3. Nitrate and chloride are also monitored in all of the Mill’s groundwater monitoring wells and chloroform investigation wells. Data from those wells for the Quarter are incorporated in certain maps and figures in this report. 2.1.2 Parameters Analyzed Locations sampled during this reporting period were analyzed for the following constituents: • Inorganic Chloride • Nitrate plus Nitrite as Nitrogen (referred to herein as nitrate) Use of analytical methods consistent with the requirements of the White Mesa Uranium Mill Groundwater Quality Assurance Plan, Revision 6, March 22, 2010 (the “QAP”) was confirmed for all analytes, as discussed later in this report. 2.1.3 Groundwater Head and Level Monitoring Depth to groundwater was measured in the following wells and/or piezometers, pursuant to Part I.E.3 of the Groundwater Discharge Permit (the “GWDP”) (January 20, 2010/June 21, 2010): • The quarterly groundwater compliance monitoring wells. • Existing well MW-4 and all of the temporary chloroform investigation wells. • Piezometers – P-1, P-2, P-3, P-4 and P-5. • MW-20 and MW-22 • Nitrate monitoring wells. • In addition to the above, depth to water measurements are routinely observed in conjunction with sampling events for all wells sampled during quarterly and accelerated efforts, regardless of the sampling purpose. All well levels used for groundwater contour mapping were measured and recorded within 5 calendar days of each other except TW4-26 as indicated by the measurement dates in the summary sheet under Tab C. TW4-26 was installed after the quarterly water levels were measured. Water level data for TW4-26 was recorded when the well was first sampled in June 2010. 3 2.2 Sampling Methodology and Equipment and Decontamination Procedures The QAP provides a detailed presentation of procedures utilized for groundwater sampling activities under the GWDP (January 20, 2010/June 21, 2010). The sampling methodology, equipment and decontamination procedures that were performed for the nitrate contaminant investigation, as summarized below, are consistent with the QAP. 2.2.1 Well Purging and Depth to Groundwater A list of the wells in order of increasing nitrate contamination is generated quarterly. The order for purging is thus established. The list is included with the Field Data Worksheets under Tab B. Mill personnel start purging with all of the non-detect wells and then move to the more contaminated wells in order of nitrate contamination, starting with the wells having the lowest nitrate contamination. Before leaving the Mill office, the pump and hose were decontaminated using the cleaning agents described in Section 6.2.5 of the QAP. Mill personnel then proceed to the first well which is the well with the lowest concentration of nitrate based on the previous quarter’s sampling results. Well depth measurements are taken and the two casing volumes are calculated (measurements are made using the same instrument used for the monitoring wells under the Mill’s GWDP). The Grundfos pump (a 6 to 10 gpm pump) is then lowered to the bottom of the well and purging is begun. At the first well, the purge rate is established for the purging event by using a calibrated 5 gallon bucket. After the evacuation of the well has been completed, the well is sampled, and the pump is removed from the well and the process is repeated at each well location moving from the least contaminated to most contaminated well. All wells are capped and secured prior to leaving the sampling location. Decontamination of non-dedicated equipment, using the reagents in Section 6.2.5 of the QAP, is performed between each sample location, and at the beginning of each sampling day, in addition to the pre-event decontamination described above. 2.2.2 Sample Collection Wells Following the purging of a nitrate investigation well, the sampling takes place once stabilization has been achieved in accordance with Section 6.2.7 of the QAP. Prior to leaving the Mill office to sample, a cooler along with ice is prepared. A trip blank is not required as the sampling event does not include analyses for Volatile Organic Compounds (“VOCs”). Once Mill Personnel arrive at the well sites, labels are filled out for the various samples to be collected. All personnel involved with the collection of water and samples are then outfitted with rubber gloves to avoid sample contamination. 4 Each quarterly pumping and sample collection event begins at the location least affected by nitrate (based on the previous quarter’s sampling event) and proceeds by affected concentration to the most affected location. The dedicated portable pump is appropriately decontaminated prior to each sampling event, each sampling day, and between well samples, and the Quality Control (“QC”) rinsate sample is collected after said decontamination but prior to the sampling of the next sampling well. Purging practices are consistent with the requirements of Section 6.2.7 of the QAP. Samples are taken from the portable pump after stabilization has been achieved, unless the well is pumped dry. If the well is pumped dry, Mill personnel use a disposable bailer to sample the well after it has recovered in accordance with Section 6.2.7 of the QAP. The bailer is attached to a reel of approximately 150 feet of nylon rope and then lowered into the well. After coming into contact with the water, the bailer is allowed to sink into the water in order to fill. Once full, the bailer is reeled up out of the well. Sample bottles are filled as follows; • First, a 250 ml sample is collected for nitrate/nitrite. This sample is not filtered, but is preserved with H2SO4. • Second, a 500 ml sample is collected for chloride. This sample is not filtered and is not chemically preserved. After the samples have been collected for a particular well, the samples are placed into the cooler that contains ice. The well is then recapped and Mill personnel proceed to the next well. If a bailer has been used it is disposed of. Ponds Grab samples are taken from the UWLP using a disposable bailer. Sample bottles are filled in the same manner as for wells, as stated above. After the samples are collected, the bailer is disposed of and samples are placed into a cooler containing ice for sample preservation and transit to the Mill’s contract analytical laboratory, Energy Laboratories (“EL”). Piezometers Samples are collected from Piezometers 1, 2 and 3, if possible. Samples are collected from piezometers using a disposable bailer following the procedures described for wells that have been pumped dry, above. However, due to the difficulty in obtaining samples from the peizometers, the purging protocols set out in the QAP are not followed. After samples are collected, the bailer is disposed of and samples are placed into a cooler containing ice for sample preservation and transit to the Mill’s contract analytical laboratory, EL. 5 2.3 Field Data Attached under Tab B are copies of all Field Data Worksheets that were completed during the quarter for the nitrate contaminant investigation monitoring wells, piezometers, and UWLP identified in Section 2.1.1 above, and Table 1. 2.4 Depth to Groundwater Data and Water Table Contour Map Depth-to-groundwater measurements which were utilized for groundwater contours are included on the Quarterly Depth to Water Sheet at Tab C of this Report along with the kriged groundwater contour map for the current quarter generated from this data. All well levels used for groundwater contour mapping were measured and recorded within 5 calendar days of each other except TW4-26 as indicated by the measurement dates in the summary sheet under Tab D. TW4-26 was installed after the quarterly water levels were measured. Water level data for TW4-26 was recorded when the well was first sampled in June 2010. A copy of the kriged groundwater contour map generated from the 1st quarter of 2010 data is provided under Tab D. 2.5 Laboratory Results 2.5.1 Copy of Laboratory Results All analytical results were provided by EL. Table 1 lists the dates when analytical results were reported to the Quality Assurance (“QA”) Manager for each well or other sample. Results from analysis of samples collected for the Second Quarter nitrate investigation are provided under Tab G of this Report. Also included under Tab G are the results of analyses for duplicate samples and rinsate samples for this sampling effort, as identified in Table 1. See the Groundwater Monitoring Report and Chloroform Monitoring Report for the Second Quarter of 2010 for nitrate and chloroform analytical results for the groundwater monitoring wells and chloroform investigation wells not listed in Table 1. 2.5.2 Regulatory Framework As discussed in Section 1.0 above, the Request, Plan, and Agreement each triggered a series of actions on DUSA’s part. Potential surficial sources of nitrate and chloride have been described in the December 30, 2009 Contamination Investigation Report. This quarterly report documents the continued monitoring consistent with the program described in the Nitrate Contamination Investigation Report. 3.0 QUALITY ASSURANCE AND DATA VALIDATION The Mill QA Manager performed a QA/QC review to confirm compliance of the monitoring program with requirements of the QAP. As required in the QAP, data QA includes preparation and analysis of QC samples in the field, review of field procedures, an analyte completeness review, and QC review of laboratory data methods and data. 6 Identification of field QC samples collected and analyzed is provided in Section 3.1. Discussion of adherence to Mill sampling Standard Operating Procedures (“SOPs”) is provided in Section 3.2. Analytical completeness review results are provided in Section 3.3. The steps and tests applied to check field data QA/QC, holding times, receipt temperature and laboratory data QA/QC are discussed in Sections 3.4.1 through 3.4.7 below. The analytical laboratory has provided summary reports of the analytical QA/QC measurements necessary to maintain conformance with National Environmental Laboratory Accreditation Conference (“NELAC”) certification and reporting protocol. The Analytical Laboratory QA/QC Summary Reports, including copies of the Mill’s Chain of Custody and Analytical Request Record forms for each set of Analytical Results, follow the analytical results under Tab G. Results of review of the laboratory QA/QC information are provided under Tab H and discussed in Section 3.4, below. 3.1 Field QC Samples The following QC samples were generated by Mill personnel and submitted to the analytical laboratory in order to assess the quality of data resulting from the field sampling program. Field QC samples for the nitrate investigation program consist of one field duplicate sample for each 20 samples, one DI Field Blank (“DIFB”) and equipment rinsate samples. During the Second Quarter of 2010, two duplicate samples were collected as indicated in Table 1. The duplicates were sent blind to the analytical laboratory and analyzed for the same parameters as the nitrate wells. Rinsate samples were also collected between well samples where nondedicated sampling equipment was used. Rinsate samples were labeled with the name of the subsequently sampled well with a terminal letter “R” added (e.g. TWN-7R). The results of these analyses are included with the routine analyses under Tab G. 3.2 Adherence to Mill Sampling SOPs On a review of adherence by Mill personnel to the existing sampling SOPs, the QA Manager observed that QA/QC requirements established in the QAP were being adhered to and that the SOPs were implemented, except as described below. 3.3 Analyte Completeness Review All analyses required by the GWDP for nitrate monitoring for the period were performed. 7 3.4 Data Validation The QAP and GWDP (January 20, 2010/June 21, 2010) identify the data validation steps and data QC checks required for the nitrate monitoring program. Consistent with these requirements, the QA Manager performed the following evaluations: a field data QA/QC Evaluation, a holding time evaluation, an analytical method check, a reporting limit evaluation, a QC evaluation of sample duplicates, a QC evaluation of control limits for analysis and blanks, a receipt temperature evaluation, and a rinsate evaluation. Because no VOCs are analyzed for the nitrate contamination investigation, no trip blanks are required in the sampling program. Each evaluation is discussed in the following sections. Data check tables indicating the results of each test are provided under Tab H. 3.4.1 Field Data QA/QC Evaluation The QA Manager performs a review of all field recorded parameters to assess their adherence with QAP requirements. The assessment involved review of two sources of information: the Field Data Sheets and the Quarterly Depth to Water summary sheet. Review of the Field Data Sheets addresses well purging volumes and stability of five parameters: conductance, pH, temperature, redox potential, and turbidity. Review of the Depth to Water data confirms that all depth measurements used for development of groundwater contour maps were conducted within a five-day period of each other except TW4-26. TW4-26 was installed after the quarterly water levels were measured. Water level data for TW4-26 was recorded when the well was first sampled in June 2010. The results of this quarter’s review are provided under Tab H. Based upon this review, all well locations conformed to the QAP requirement to evacuate two well casing volumes before sampling except TWN-3, TWN-7, TWN-14, TWN-15, TWN-17, and Piezometers 1, 2, and 3. These five wells were all pumped to dryness before two casing volumes were evacuated. In each case, representative samples of formation water were collected after the wells were allowed to recover. Piezometers 1, 2, and 3 were not pumped, and were sampled directly after measurement of one set of parameters. During review of the field data sheets, it was observed that sampling personnel consistently recorded depth to water for the quarterly sampling programs to the nearest 0.01 foot except in wells TWN-4, TWN-5, TWN-8, TWN-10, TWN-13, TWN-14, TWN- 15, TWN-17, TWN-18, TWN-19, TWN-65 (duplicate of TWN-4), and Piezometer 3. In all cases the depth to water was measured to the nearest 0.01 feet; however, the “trailing zero” which represents the hundredths place was not recorded during the field activities. In other words, the depth to water measurement for TWN-4 was 36.90 feet; however, the field personnel only recorded 36.9 feet. The data are acceptable and usable with no limitations as there is no loss of information. All field parameters for all wells were within the QAP required limits, except as follows. 8 The review of the field sheets for compliance with QAP requirements resulted in the observations noted below. The QAP requirements in Section 6.2.7 specifically state that field parameters must have stabilized to within 10% over at least 2 consecutive measurements. The QAP states that turbidity should be less than 5 Nephlometric Turbidity Units (“NTU”) prior to sampling unless the well is characterized by water that has a higher turbidity. The QAP does not require that turbidity measurements be less than 5 NTU prior to sampling. As such, the noted observations regarding turbidity measurements less than 5 NTU below are included for information purposes only. • Twelve well measurements exceeded the QAP’s 5 NTU goal as noted in Tab H. In addition, eight wells and the UWLP turbidity measurements prior to sampling exceeded the QAP’s 10% RPD requirement as noted in Tab H. Five of the wells were pumped dry prior to stabilization of turbidity or achievement of a turbidity measurement less than 5 NTU and are not included in these totals. DUSA’s letter to DRC of March 26, 2010 discusses further why turbidity does not appear to be an appropriate parameter for assessing well stabilization. In addition, DUSA is currently reviewing historical well development data in response to DRC’s letters dated June 1, 2010 and June 24, 2010 to determine additional well development strategies as required by DRC prior to DRC’s consideration of turbidity variances. Conductivity, pH, temperature, redox potential, and turbidity exceeded the QAP specified limits in TWN-3. However, TWN-3 was pumped dry prior to stabilization of field parameters. 3.4.2 Holding Time Evaluation QAP Table 1 identifies the method holding times for each suite of parameters. Sample holding time checks are provided in Tab H. All samples were received and analyzed within the required holding time. 3.4.3 Receipt Temperature Evaluation Chain of Custody sheets were reviewed to confirm compliance with the QAP requirement in QAP Table 1 that samples be received at 6oC or lower. Sample temperatures checks are provided in Tab H. All samples were received within the required temperature limit. 3.4.4 Analytical Method Checklist All analytical methods reported by the laboratory were checked against the required methods enumerated in the QAP. Analytical method checks are provided in Tab H. All methods were consistent with the requirements of the QAP. 3.4.5 Reporting Limit Evaluation All analytical method reporting limits reported by the laboratory were checked against the reporting limits enumerated in the QAP. Reporting Limit Checks are provided in Tab 9 H. All analytes were measured and reported to the required reporting limits, with the exception of seventeen samples that had increased reporting limits due to matrix interference or required dilution due to the sample concentration. However, in all of those cases the analytical results were greater than the reporting limit used. 3.4.6 QA/QC Evaluation for Sample Duplicates Section 9.1.4 a) of the QAP states that RPDs will be calculated for the comparison of duplicate and original field samples. The QAP acceptance limits for RPDs between the duplicate and original field sample is less than or equal to 20% unless the measured results (described as activities in the QAP) are less than 5 times the required detection limit. This standard is based on the EPA Contract Laboratory Program National Functional Guidelines for Inorganic Data Review, February 1994, 9240.1-05-01 as cited in the QAP. The RPDs are calculated for all duplicate pairs for all analytes regardless of whether or not the reported concentrations are greater than 5 times the required detection limits. However, data will be considered noncompliant only when the results are greater than 5 times the required detection limit and the RPD is greater than 20%. The additional duplicate information is provided for information purposes. All analytical results were within the 20% RPD acceptance limits for each of the two duplicates and its associated well. Results of the RPD test are provided in Tab H. 3.4.7 Rinsate Check Rinsate checks are provided in Tab H. A review of the analytical results reported for rinsate samples indicated that ten of the rinsate samples had low levels of nitrate. All of the rinsate samples had nitrate detections of 0.1 to 0.2 mg/L nitrate. A comparison of the rinsate sample concentration levels to the QAP requirements -- that rinsate sample concentrations be one order of magnitude lower than that of the actual well -- indicated that four of the rinsate samples, TWN-1R, TWN-5R, TWN-12R and TWN-13R, had concentrations of nitrate above this conformance level. The nitrate concentrations in the rinsate samples are just at or slightly above the detection limit and are not dependent on or affected by the previous sample concentrations. This indicates that the contamination is due to some external factor such as the nitric acid rinse during the decontamination process rather than cross-contamination from the purging process. However, based on the above findings, for this current quarter’s data, the presence of nitrate in the rinsate samples does not affect the validity or utility of the groundwater data for the following reasons: • For the four wells in which the preceding rinsate sample levels exceeded the conformance criterion, the nitrate concentrations in the wells and the rinsate samples were significantly lower than the GWDP GWCL of 10.0 mg/L for nitrate. 10 • For all other rinsate samples with detections of nitrate, the nitrate level was relatively low, ranging from 10 times to 77 times lower than the nitrate level in the subsequently sampled well. • Low level rinsate samples are indicative of potential false positive results in the low level sample results. Higher level sample results could potentially be biased high. Both situations are a more conservative approach to the assessment of sample results because a high bias means that reported results for this analyte will tend to be more conservative or higher than actual concentrations. To address the likely nitric acid contamination, DUSA has requested in the revised QAP the removal of the nitric acid rinse step from the decontamination procedure when samples are not collected for heavy metals. However, DUSA will proceed with the removal of that step only upon approval of the QAP revision. 3.4.8 Other Laboratory QA/QC Section 9.2 of the QAP requires that the laboratory’s QA/QC Manager check the following items in developing data reports: (1) sample preparation information is correct and complete, (2) analysis information is correct and complete, (3) appropriate Analytical Laboratory procedures are followed, (4) analytical results are correct and complete, (5) QC samples are within established control limits, (6) blanks are within QC limits, (7) special sample preparation and analytical requirements have been met, and (8) documentation is complete. In addition to other laboratory checks described above, DUSA’s QA Manager rechecks QC samples and blanks (items (5) and (6)) to confirm that the percent recovery for spikes and the relative percent difference for spike duplicates are within the method-specific required limits, or that the case narrative sufficiently explains any deviation from these limits. Results of this quantitative check are provided in Tab H. All lab QA/QC results met these requirements. 4.0 INTERPRETATION OF DATA 4.1 Interpretation of Groundwater Levels, Gradients and Flow Directions. 4.1.1 Current Site Groundwater Contour Map As stated above, a listing of groundwater level readings for the current quarter (shown as depth to groundwater in feet) is included under Tab C. The data from this tab has been interpreted (kriged) and plotted in a water table contour map, provided under the same tab. The contour map is based on the May 11, 2010 data for all wells except for well TW4-26, which is based on the June 14, 2010 data, collected when the well was first sampled. 11 4.1.2 Comparison of Current Groundwater Contour Map to Groundwater Contour Map for Previous Quarter The groundwater contour map for the Mill site for the first quarter of 2010, as submitted with the Nitrate Monitoring Report for the first quarter of 2010, is attached under Tab D. A comparison of the water table contour map for the second quarter of 2010 to the water table contour map for the previous quarter indicates similar patterns of drawdown related to pumping of MW-4, MW-26 (TW4-15), TW4-4, TW4-19 and TW4-20. Water levels and water level contours for the site have not changed significantly since the last quarter, except for a few locations. Pumping at TW4-4, which began in the first quarter of 2010, has depressed the water table near TW4-4, but does not yet appear to have measurably affected water levels at adjacent wells. A reported decrease in water level of approximately 3 feet occurred in well MW-23. Reported decreases in water levels of approximately 15 feet and 9 feet occurred in pumping wells TW4-4 and TW4-19, respectively, and a reported increase in water level of approximately 5 feet occurred in pumping well MW-4. Water level changes at other pumping wells were less than 5 feet. Water level fluctuations at pumping wells MW-4, MW-26 (TW4-15), TW4-4, TW4-19, and TW4-20 are due in part to fluctuations in pumping conditions just prior to and at the time the measurements are taken. The largest decrease (increase in drawdown) of approximately 15 feet occurred in well TW4-4, and the largest increase (decrease in drawdown), of approximately 5 feet, occurred at MW-4. 4.1.3 Hydrographs Attached under Tab E are hydrographs showing groundwater elevation in each nitrate contaminant investigation monitor well over time. 4.1.4 Depth to Groundwater Measured and Groundwater Elevation Attached in Tab F are tables showing depth to groundwater measured and groundwater elevation over time for each of the wells listed in Section 2.1.1 above. 4.2 Review of Analytical Results 4.2.1 Current Nitrate and Chloride Isoconcentration Maps Included under Tab I of this Report are current nitrate and chloride iso-concentration maps for the Mill site. Nitrate iso-contours start at 5 mg/L and chloride iso-contours start at 5 mg/L because those values appear to separate the plumes from background. 12 4.2.2 Nitrate and Chloride Concentration Trend Data and Graphs Attached under Tab J is a table summarizing values for nitrate and chloride for each well over time. Some data (MW-18, MW-19 and the Frog Pond) were not sampled this period but the historical data are included for information purposes. Attached under Tab K are graphs showing nitrate and chloride concentration trends in each monitor well over time. It is important to note that the plotting data for the nitrate, and chloride have recently undergone an extensive internal quality review by DUSA’s QA Manager. Additionally, the graphing format was changed from line graphs to XY scatter plots to provide an improved graphical representation. 4.2.3 Interpretation of Analytical Data Generally, the shapes of the nitrate and chloride plumes appear to be stable and unchanged since the last quarter of 2009 and the first quarter of 2010. The nitrate and chloride plumes maintain their general geographic association and it is still possible to separate the plumes into a segment northeast of the wildlife ponds and a southwest segment near the Mill site. Nitrate and chloride concentrations in samples from the downgradient edge of the plumes (in the vicinity of tailings impoundment monitoring wells MW-30 and MW-31) have remained unchanged, and the plume does not appear to be migrating in that direction. In general, both nitrate and chloride concentrations in nitrate monitoring wells are within about 30 percent of last quarter’s concentration or have declined (Tables 2 and 3). Chloride declined by 222 percent in samples from Piezomiter-3 and by 80 percent in samples from TWN-10. Nitrate has also declined in samples from TWN-10, going from 1.5 to 1.0 mg/L, a 33 percent decline. In contrast, increasing concentrations were observed in samples from TWN-2 and TW4- 12. Second quarter nitrate results from TWN-2 (69 mg/L) have confirmed the concentration of 62.1 mg/L measured in first quarter 2010, representing a threefold increase over the 20.8 mg/L measured in the fourth quarter of 2009. Chloride concentrations have increased less dramatically, from 55 mg/L in fourth quarter 2009 to 85 mg/L in first quarter 2010 and then to 97 mg/L in second quarter 2010. Nitrate concentrations in samples from chloroform monitor well TW4-12 increased from 4 mg/L in the first quarter of 2010 to the current sample concentration of 11 mg/L. This is the first time that the 10 mg/L groundwater standard for nitrate has been exceeded in this well. Chloride values have increased more modestly from 22 mg/L to 29 mg/L. Increased concentrations in samples from TWN-2 and TW4-12 may be due to changes in groundwater flow direction as a result of pumping for chloroform remediation or they may be due to the general variability of groundwater data. It is also worth noting that the nitrate concentration increased from approximately 6 mg/L to 11 mg/L in far upgradient well TWN-17. 13 5.0 CORRECTIVE ACTION REPORT Necessary corrective actions identified during the current monitoring period are described below. 5.1 Identification and definition of the problem • Turbidity RPDs exceeded 10% for eight nitrate sampling wells. • Depth to water measurements were measured properly to the nearest 0.01 feet, however, trailing zeros were not recorded on the field sheets. • Rinsate samples have nitrate levels that most likely result from decontamination procedures. 5.2 Assignment of Responsibility for Investigation of the Problem The problems have been investigated by the QA Manager. 5.3 Investigation and Determination of Cause of the Problem Data indicate that it may not be feasible to achieve both a turbidity level of less than 5 NTU and a stabilized turbidity between any two measurements within 10% RPD in every well. DUSA is currently reviewing historical well development data in response to DRC’s letters dated June 1, 2010 and June 24, 2010 to determine additional well development strategies to address turbidity variances. Specifically, during ongoing discussions and correspondence with DRC, DUSA has agreed to evaluate whether the wells with recurrent instability have been properly developed and to establish a list of wells which will be redeveloped. Depth to Water Based on discussions with Mill personnel, depth to water measurements were measured properly to the nearest 0.01 feet, however, trailing zeros were not recorded on the field sheets. Rinsate Nitrate Levels To address the nitric acid contamination, DUSA has requested in the revised QAP the removal of the nitric acid rinse step when samples are not collected for heavy metals. However, DUSA will proceed with the removal of that step only upon approval of the QAP revision. No further investigation is required. 5.4 Determination of a Corrective Action to Eliminate the Problem Turbidity DUSA is currently evaluating the suitability of turbidity, as well as other parameters, in determining stabilization of monitoring wells. DUSA is preparing a summary of historical well development information for existing groundwater wells and will make a recommendation to DRC regarding which wells should be redeveloped. DUSA’a letter 14 of July 12, 2010 and DRC’s response of July 15, 2010 identified the parameters for selecting wells for redevelopment. Depth to Water Mill personnel have been advised that depth to water must be recorded to the nearest 0.01 feet. If the measurement is a whole integer number or the final measurement number is zero, it must be recorded on the field sheet to the nearest 0.01 feet. In addition, DUSA has purchased a data capture system that will be employed for recording field data. The data system will allow the real-time recording of field data on hardcopy forms while digitally storing the information as it is collected. The data collection system and revised field forms will not allow incomplete data collection such as recording depth to water without all decimal places recorded. To address the implementation of the data capture, DUSA has requested the use of new field forms in the revised QAP. DUSA will proceed with the implementation of that step upon revision of the forms to address DRC comments and subsequent DRC approval of the QAP revision. Rinsate Nitrate Levels The corrective action is the removal of the nitric acid rinse from the decontamination procedures when samples are not collected for heavy metals. 5.5 Assigning and Accepting Responsibility for Implementing the Corrective Action It will be the responsibility of the Director, Compliance and Permitting to implement the following corrective actions. Turbidity Development of recommendations and QAP changes to address turbidity have been submitted and discussion between DRC and DUSA completed. Determination of wells to be redeveloped is underway. DUSA is currently reviewing historical well development data in response to DRC’s letters dated June 1, 2010 and June 24, 2010 and the parameters developed on July 12, 2010 and July 15, 2010 to determine a list of wells requiring redevelopment. Depth to Water Development of recommendations and QAP changes to address the incomplete recording of field data has been started. DUSA is currently revising the field forms to address DRC comments. Upon completion of the field form modifications, and DRC approval of the QAP, DUSA will completely implement the field data capture program. Rinsate Nitrate Levels The corrective action is the removal of the nitric acid rinse from the decontamination procedures when samples are not collected for heavy metals. 15 5.6 Implementing the Corrective Action and Evaluating Effectiveness Implementation of the corrective action for turbidity, depth to water, and revised decontamination procedures will follow development and DRC approval of an action plan (turbidity) and the revised QAP (depth to water and rinsate nitrate levels). 5.7 Verifying That the Corrective Action Has Eliminated the Problem Verification will occur following DRC review of the proposed well redevelopment list and implementation of redevelopment as required. Verification of depth to water measurements will begin next quarter during the field activities to assure that measurements are recorded completely prior to the implementation of the digital data capture program. Full verification of the field data capture program will begin after the program has been implemented. Verification that nitrate source(s) have been removed will occur after DRC approval of the revised QAP. 6.0 CONCLUSIONS AND RECOMMENDATIONS Generally, the shapes of the nitrate and chloride plumes appear to be stable and unchanged since the last quarter of 2009 and the first quarter of 2010. The nitrate and chloride plumes maintain their general geographic association, and it is still possible to separate the plumes into a segment northeast of the wildlife ponds and a southwest segment near the Mill site. Nitrate and chloride concentrations in samples from the downgradient edge of the plumes (in the vicinity of tailings impoundment monitoring wells MW-30 and MW-31) have remained unchanged, and the plume does not appear to be migrating in that direction. In general, both nitrate and chloride concentrations in nitrate monitoring wells are within about 30 percent of last quarter’s concentration or have declined (Tables 2 and 3). The current quarter’s data continue to support the conclusions in the Nitrate Contamination Investigation Report that a) the nitrate and chloride appear to originally have come from the same source; and b) the source is upgradient of the Mill property more than 1.2 miles from the Mill facility, and is not the result of Mill activities. 7.0 ELECTRONIC DATA FILES AND FORMAT DUSA has provided to the Executive Secretary an electronic copy of all laboratory results for groundwater quality monitoring conducted under the nitrate contaminant investigation during the Quarter,in Comma Separated Values ("CSV")format.A copy of the transmittal e-mail is included under Tab L. 8.0 SIGNATURE AND CERTIFICATION This document was prepared by Denison Mines (USA)Corp.on August 30,2010. DENISON MINES (USA)CORP. By: '.F denlund resident,Regulatory Affairs and Counsel 16 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 properly gather and evaluate the information submitted. Based on my inquiry of the person or persons who manage the system,or those persons directly responsible for gathering the information,the information submitted is,to the best ofmy knowledge and belief,true,accurate,and complete.I am aware that there are significant penalties r submitting false information,including the possibility of fine and imprisonm for owing violations. Davi C.ryde lund Vice President,Regulatory Affairs and Counsel Denison Mines (USA)Corp. 17 Well L Sample CollectionDate Date of Lab Report Piezometer 1 e 6/2/2010 6/16/2010 Piezometer 2 e 6/2/2010 6/16/2010 Piezometer 3 e 6/2/2010 6/16/2010 TWN-1 W 5/26/2010 6/15/2010 TWN-1R N 5/26/2010 6/15/2010 TWN-2 W 6/2/2010 6/16/2010 TWN-2R N 6/2/2010 6/16/2010 TWN-3 W 6/3/2010 6/16/2010 TWN-3R N 6/2/2010 6/16/2010 TWN-4 W 5/27/2010 6/15/2010 TWN-4R N 5/27/2010 6/15/2010 TWN-5 W 5/26/2010 6/15/2010 TWN-5R N 5/26/2010 6/15/2010 TWN-6 W 6/1/2010 6/16/2010 TWN-6R N 6/1/2010 6/16/2010 TWN-7 W 5/28/2010 6/15/2010 TWN-7R N 5/27/2010 6/15/2010 TWN-8 W 5/26/2010 6/15/2010 TWN-8R N 5/26/2010 6/15/2010 TWN-9 W 6/1/2010 6/16/2010 TWN-9R N 6/1/2010 6/16/2010 TWN-10 N 6/2/2010 6/16/2010 TWN-10R N 6/1/2010 6/16/2010 TWN-11 N 6/1/2010 6/16/2010 TWN-11R N 6/1/2010 6/16/2010 TWN-12 N 5/26/2010 5/26/2010 TWN-12R N 5/26/2010 6/15/2010 TWN-13 N 5/26/2010 6/15/2010 TWN-13R N 5/26/2010 6/15/2010 TWN-14 N 6/2/2010 6/16/2010 TWN-14R N 6/1/2010 6/16/2010 TWN-15 N 5/28/2010 6/15/2010 TWN-15R N 5/27/2010 6/15/2010 TWN-16 N 5/27/2010 6/15/2010 TWN-16R N 5/27/2010 6/15/2010 TWN-17 N 6/3/2010 6/16/2010 TWN-17R N 6/2/2010 6/16/2010 TWN-18 N 6/1/2010 6/16/2010 TWN-18R N 6/1/2010 6/16/2010 TWN-19 N 6/1/2010 6/16/2010 TWN-19R N 6/1/2010 6/16/2010 TWN-65 N 5/27/2010 6/15/2010 TWN-70 N 6/2/2010 6/16/2010 TWN-60 N 6/10/2010 6/24/2010 UWLP W 6/2/2010 6/16/2010 Note: All wells were sampled for Nitrate and Chloride TWN-60 is a DI Field Blank TWN-65 is a duplicate of TWN-4, and TWN-70 is a duplicate of TWN-2 UWLP is a sample from the Upper Wildlife Pond Table 1 Summary of Well Sampling and Constituents for the Period Location 4th Quarter 2009 Nitrate Result (mg/L) 1st Quarter 2010 Nitrate Result (mg/L) 2nd Quarter 2010 Nitrate Result (mg/L) Difference Between 1st and 2nd Quarter 2010 (%) Piez 1 NA NA 7.2 NA Piez 2 NA NA 0.6 NA Piez 3 NA 1.7 1.6 -6 TWN 1 0.5 0.5 0.6 17 TWN 10 1.4 1.5 1 -50 TWN 11 1.3 1.4 1.3 -8 TWN 12 0.5 0.7 0.8 13 TWN 13 0.5 0.1 0.1 0 TWN 14 3.4 2.9 2.9 0 TWN 15 1.1 0.7 1 30 TWN 16 1 1.2 1.3 8 TWN 17 6.7 10.4 11 5 TWN 18 1.3 1.6 1.8 11 TWN 19 7.4 7.2 6.2 -16 TWN 2 20.8 62.1 69 10 TWN 3 29 25.3 26 3 TWN 4 0.4 0.9 1 10 TWN 5 0.2 0.3 0.3 0 TWN 6 1.4 1.5 1.4 -7 TWN 7 0.1 0.8 1.2 33 TWN 8 < 0.1 < 0.1 < 0.1 0 TWN 9 12 7.6 7.7 1 < 0.1 indicates a nondetect sample result Nitrate Percent Difference Table 2 Location 4th Quarter 2009 Chloride Result (mg/L) 1st Quarter 2010 Chloride Result (mg/L) 2nd Quarter 2010 Chloride Result (mg/L) Difference Between 1st and 2nd Quarter 2010 (%) Piez 1 NA NA 52 NA Piez 2 NA NA 8 NA Piez 3 NA 116 36 -222 TWN 1 18 17 20 15 TWN 10 26 54 30 -80 TWN 11 74 73 72 -1 TWN 12 109 113 106 -7 TWN 13 83 47 49 4 TWN 14 32 24 30 20 TWN 15 78 43 39 -10 TWN 16 39 35 35 0 TWN 17 152 78 87 10 TWN 18 57 42 63 33 TWN 19 125 118 113 -4 TWN 2 55 85 97 12 TWN 3 106 111 118 6 TWN 4 11 22 22 0 TWN 5 48 43 44 2 TWN 6 21 19 22 14 TWN 7 7 6 6 0 TWN 8 12 11 11 0 TWN 9 205 183 175 -5 Chloride Percent Difference Table 3 INDEX OF TABS Tab A Site Plan and Perched Well Locations White Mesa Site Tab B Order of Sampling and Field Data Worksheets Tab C Kriged Current Quarter Groundwater Contour Map and Depth to Water Data Tab D Kriged Previous Quarter Groundwater Contour Map Tab E Hydrographs of Groundwater Elevations Over Time for Nitrate Monitoring Wells Tab F Depths to Groundwater and Elevations Over Time for Nitrate Monitoring Wells Tab G Laboratory Analytical Reports Tab H Quality Assurance and Data Validation Tables H-1 Field Data QA/QC Evaluation H-2 Holding Time Evaluation H-3 Receipt Temperature Check H-4 Analytical Method Check H-5 Reporting Limit Evaluation H-6 QA/QC Evaluation for Sample Duplicates H-7 Rinsate Check H-8 QC Control Limits for Analyses and Blanks Tab I Kriged Current Quarter Isoconcentration Maps Tab J Analyte Concentration Data Over Time Tab K Concentration Trend Graphs Tab L CSV Transmittal Letter Tab A Site Plan and Perched Well Locations White Mesa Site HYDRO GEO CHEM, INC.APPROVED DATE REFERENCE FIGURE CELL NO. 2 CELL NO. 4A 3332 MW-21 3000 BOUNDARY PROPERTY SCALE IN FEET 0 CELL NO. 1 MILL SITE MW-01 MW-02 MW-03 MW-05 MW-11 MW-12 MW-14 MW-15 MW-16 MW-17 MW-18 MW-19 MW-20 MW-22 MW-23 MW-24 MW-25 MW-27 MW-28 MW-29 MW-30 MW-31 MW-32 PIEZ-1 PIEZ-2 PIEZ-3 PIEZ-4 PIEZ-5 MW-26 TW4-1 TW4-2 TW4-3 TW4-4 TW4-5 TW4-6 TW4-9 TW4-11 TW4-12 TW4-13 TW4-14 TW4-16 TW4-18 TW4-20 TW4-21 TW4-26 MW-04TW4-7 TW4-8 TW4-10 TW4-22 TW4-19 TW4-23 TW4-24 TW4-25 TWN-1 TWN-2 TWN-3 TWN-4 TWN-5 TWN-6 TWN-7 TWN-8 TWN-9 TWN-10 TWN-11 TWN-12 TWN-13 TWN-14 TWN-15 TWN-16 TWN-17 TWN-18 TWN-19 MW-20 PIEZ-1 perched monitoring well perched piezometer temporary perched monitoring well SITE PLAN AND PERCHED WELL LOCATIONS WHITE MESA SITE H:/718000/aug10/welloc.srf TW4-19 EXPLANATION wildlife pond SJS temporary perched nitrate monitoring well TWN-1 temporary perched monitoring well installed May, 2010 TW4-26 Tab B Order of Sampling and Field Data Worksheets Nitrate Order 1st Quarter 2010 Nitrate Samples Rinsate Samples Name Nitrate Mg/L Date/Purge sample Depth Total Depth Name Date Sample Samplers:i'ennu H 5·.2L-w Ok.~ S·~'-IO 11')(\1; ~_~-IO 1Mb 5-:lklO 133C "•.:lL-1t'>II.I'Ili i ~-:rt../o /')qIt! ';'-XT-ID (('\41 S -2.7_Ib 12St; "-:2.7_/0 J'JS6 1"-1-10 1\75J. ICI-ID O\SSb !>-J -10 O,5:l. 1~-I-ltJ In'll.! \:,-I-\0 L'2IJ... b -I _10 1'311; (..,,1 -If)11.\1<' b.;J..-IO 01"1.5 '·d.-ll>OKI.(I '-~-lO 0'1;('1 TWN-SR TWN-IR TWN-12R TWN-8R TWN-13R TWN-7R TWN-6R TWN-16R TWN-18R TWN-lOR TWN-9R TWN-14R TWN-19R TWN-17R TWN-3R 1",.~L.IU 0 O''!I'''-71.1.11 145.5 1 ...-:l.C.·lb o lllj"f<C>.t.1 120 Is...1b-11>o 1~S;{.llS.I",lS0 :5 .~-16 o V·\Cl'6 '-~(;t,112.5 ,-::t(,-It.>o )1dw 7'-1.73 110 ...~t·IO o 07.so '1:1..4'l..lSS c;•.:Ilt.ID o O'1'~%..Ir 105 ••'1-'.,0 o 13:10 "-<t."I 125.7 11;.-77.10 o 1~1-;'If<.Stt;100 E.-I.1&o Q/!;;lb «7.01 142 1"'/'/0 o MIl(f«.~1 130 "-'1.·1D o \210 ~n.l"105 b-I ·Ii\o l:;'U<I 'II ILl 145 (.·:l,-ID o l'l"l.l b?-~135 b-I ,10 0 ~o.15 1?,<{b 110 1;-1,In o gq.let /43Gf 97 ,"'""'''00107 U'Z,J;_4<.l 110 (;.-<'.10 o 0711<;31$\96 1..2.[0 o~Ii 6 96 0151 (,71", (,.;;l.-Io !'i,;'l..EoI.q, (,..;1..10 1'1/1 11,.77.. b~,IO 0 l'mf ~".l. I b'~'~1036 . TWN-8 NO TWN-13 NO TWN-S 0.3 TWN-l D.S TWN-12 0.7 TWN-15 l'0.7 TWN-7 ~0.8 TWN-4 0.9 TWN-16 1.2 TWN-ll 1.4 TWN-6 1.5 TWN-l0 4S 1.5 TWN-18 1.6 TWN-14 iF 2.9 TWN-19 7.2 TWN'9 7.6 fWN-17 ill'10.4 TWN-3t;'2S.3 TWN-2 62.1 Piez 1 n, Piez 2 n, Piez3 1.7 wildlife NO ,\W N 10 iP~').·~[J\O ,\lIJ b5 5-2.7-1W:> Mi!l-l!:lF~lWll!lI!W1Jg@F J!]ljsdlZJ'~~J!'ernmi~ t!Jro_~Jlji@FM@IJJi~rri'jn1ig Q~miil.vAggtiiiliEelI'I~lJ(1Q!.!l11') " m!''108 dill,'.•.~..:""".....(,6%-~'.-.:,_........,..,j}~.!>f)~- CondOOilmce~-"':2I___ pH,--:-:-__7L.:'J-IJ4:-~'_-'--_ .~(,,,;.,,:,,r15: DfS ~&.t Mmiat (EJl)'4H,J,JI:c..(.]__--,-__ !'. • M,~ditY..3q""'.~"'--__~........--,. A'll"JrA(C~JI WlHiII'll'E ~PA ~it~J.l.!!IIJLJL lFJilli:JLJIj)lllJA'Jl'A ([!)~~.l iGJ&.iQ)lill\!IDJ WA'JJ.'JElR l(J:BOC.U@!ll@Jf.§:!iuilpluungEv':lii:'11't'~.•,.'c"S'!,'¥'""'""'*'''--..."......,,....__-_,_--- ;;;\-';.":\'j:':",";',':.,';,,;:;.''.-,:!'-' l,oo!iiUalli (wiiln'~)'JW,\l I jmiitJ~r8 J:;,;"U 1-k1tG{:;1 'ff.ka~:/d &1AE",L. 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S/OOJ ='--~....lIM"4;;a!t-.,-,-"'::""'L:""'-','. -GhIoiCJ":ll&Js..e._ ".,1, .\",.,:' Commems Arrj\lctb M srte,,~lOX?"";'otrC g f;.Mt;.,Ate,·PI"UC,J-¥C 1ATJ"r 'N<n+.,....1(;t s.h .f \,qr",,\crS 'lh",~,6(~:?i.f:"J!lpblIt I@ 1&sok Tab C Kriged Current Quarter Groundwater Contour Map and Depth to Water Summary HYDRO GEO CHEM, INC.APPROVED DATE REFERENCE FIGURE 3332 3000 SCALE IN FEET 0 5580 5504 5471 5503 5521 5501 5495 5494 5499 5587 5604 5457 5450 5495 5507 5538 5577 5543 5512 5538 5547 5556 5558 5584 5531 5585 5538 5583 5578 5566 5586 5573 5524 5546 5560 5549 558455615564 5582 5574 5537 5594 5612 5601 5543 5541 MW-01 MW-02 MW-03 MW-05 MW-11 MW-12 MW-14 MW-15 MW-17 MW-18 MW-19 MW-20 MW-22 MW-23 MW-24 MW-25 MW-27 MW-28 MW-29 MW-30 MW-31 MW-26 MW-32 TW4-19 TW4-26 PIEZ-1 PIEZ-2 PIEZ-3 PIEZ-4 PIEZ-5 5551 5554 5555MW-04 5542 5570 5599 TWN-3 TWN-4 TWN-5 TWN-6 TWN-7 TWN-8 TWN-9 TWN-10 TWN-11 TWN-12 TWN-13 TWN-14 TWN-15 TWN-16 TWN-17 TWN-18 TWN-19 5603 5605 5585 5590 5560 5590 5583 5585 5615 5632 5588 5587 5584 5604 5607 5588 5608 5601 5613 TWN-1 TWN-2 TW4-20 TW4-4 MW-22 PIEZ-1 5450 5594 perched monitoring well showing elevation in feet amsl perched piezometer showing elevation in feet amsl 5556 temporary perched monitoring well showing elevation in feet amsl KRIGED 2nd QUARTER, 2010 WATER LEVELS WHITE MESA SITE H:/718000/aug10/wl0610.srf EXPLANATION temporary perched monitoring well installed May, 2010 showing elevation in feet amsl SJS temporary perched nitrate monitoring well showing elevation in feet amsl TWN-4 5605 NOTE: MW-4, MW-26, TW4-4, TW4-19 and TW4-20 are pumping wells TW4-26 5537 NAME: 612.14 820 DATE: 1450 TIME WELL I.D. DEPTH TIME WELL I.D. DEPTH TIME WELL I.D. DEPTH 1404 MW‐1 67.36 846 TW4‐1 62.39 TW4‐26* 64.78 1052 MW‐2 109.59 851 TW4‐2 67.09 1320 PIEZ‐1 61.75 934 MW‐3 84.21 842 TW4‐3 48.41 1314 PIEZ‐2 16.41 936 MW‐3A 85.40 913 TW4‐4 82.61 1308 PIEZ‐3 37.29 849 MW‐4 71.35 839 TW4‐5 55.84 949 PIEZ‐4 48.45 1042 MW‐5 106.37 911 TW4‐6 70.64 946 PIEZ‐5 43.45 957 MW‐11 89.47 848 TW4‐7 66.87 1023 TWN‐1 47.43 1046 MW‐12 108.36 844 TW4‐8 66.83 1017 TWN‐2 13.91 1036 MW‐14 103.55 840 TW4‐9 54.32 1300 TWN‐3 31.27 1038 MW‐15 106.31 837 TW4‐10 56.08 1310 TWN‐4 36.51 930 MW‐17 76.25 853 TW4‐11 58.01 1401 TWN‐5 69.80 1357 MW‐18 70.37 919 TW4‐12 37.88 1352 TWN‐6 74.54 1317 MW‐19 50.64 921 TW4‐13 47.06 1409 TWN‐7 89.66 1440 MW‐20 84.02 923 TW4‐14 88.76 1354 TWN‐8 61.53 1434 MW‐22 67.24 836 TW4‐15 79.84 1322 TWN‐9 64.39 1007 MW‐23 117.24 856 TW4‐16 64.17 1349 TWN‐10 81.56 1011 MW‐24 114.53 907 TW4‐17 76.35 1344 TWN‐11 69.37 953 MW‐25 74.94 1026 TW4‐18 57.11 1341 TWN‐12 36.60 836 MW‐26 79.84 1429 TW4‐19 70.04 1327 TWN‐13 46.68 1015 MW‐27 50.61 834 TW4‐20 65.31 1330 TWN‐14 62.81 1058 MW‐28 77.28 1029 TW4‐21 57.12 1347 TWN‐15 92.33 1004 MW‐29 102.31 832 TW4‐22 54.71 1336 TWN‐16 48.39 859 MW‐30 76.65 909 TW4‐23 65.76 1334 TWN‐17 35.00 904 MW‐31 68.99 830 TW4‐24 55.92 1303 TWN‐18 57.74 907 MW‐32 76.35 1019 TW4‐25 45.28 1448 TWN‐19 53.47 Comments: * TW4‐26 was installed after the quarterly water levels were measured. The measurement recorded above was recorded when the well was purged proior to the first sampling event on June 14, 2010. Quarterly Depth to Water Tanner Holliday MMHG: Start time: 5/11/2010 Finish Time: Tab D Kriged Previous Quarter Groundwater Contour Map HYDRO GEO CHEM, INC.APPROVED DATE REFERENCE FIGURE 3332 3000 SCALE IN FEET 0 5582 5503 5472 5503 5521 5501 5494 5494 5499 5587 5604 5458 5450 5498 5507 5537 5577 5543 5512 5538 5547 5557 5558 5584 5546 5586 5538 5584 5578 5565 5586 5572 5523 5544 5560 5548 55855571 5564 5583 5574 5593 5612 5602 5543 5541 MW-01 MW-02 MW-03 MW-05 MW-11 MW-12 MW-14 MW-15 MW-17 MW-18 MW-19 MW-20 MW-22 MW-23 MW-24 MW-25 MW-27 MW-28 MW-29 MW-30 MW-31 MW-26 MW-32 TW4-19 PIEZ-1 PIEZ-2 PIEZ-3 PIEZ-4 PIEZ-5 5546 5555 5555MW-04 5541 5569 5600 TWN-3 TWN-4 TWN-5 TWN-6 TWN-7 TWN-8 TWN-9 TWN-10 TWN-11 TWN-12 TWN-13 TWN-14 TWN-15 TWN-16 TWN-17 TWN-18 TWN-19 5603 5605 5585 5590 5560 5590 5583 5585 5615 5630 5587 5587 5584 5604 5606 5587 5607 5601 5612 TWN-1 TWN-2 TW4-20 TW4-4 MW-22 PIEZ-1 5450 5593 perched monitoring well showing elevation in feet amsl temporary perched monitoring well installed April, 2005 showing elevation in feet amsl perched piezometer showing elevation in feet amsl 5557 MW-31 5547 temporary perched monitoring well showing elevation in feet amsl 5574 perched monitoring well installed April, 2005 showing elevation in feet amsl KRIGED 1st QUARTER, 2010 WATER LEVELS WHITE MESA SITE H:/718000/may10/wl0310.srf EXPLANATION temporary perched monitoring well installed May, 2007 showing elevation in feet amsl5541 SJS temporary perched nitrate monitoring well showing elevation in feet amsl TWN-4 5605 NOTE: MW-4, MW-26, TW4-4, TW4-19 and TW4-20 are pumping wells Tab E Hydrographs of Groundwater Elevations Over Time for Nitrate Monitoring Wells 45.0 45.5 46.0 46.5 12 / 1 8 / 0 8 03 / 2 8 / 0 9 07 / 0 6 / 0 9 10 / 1 4 / 0 9 01 / 2 2 / 1 0 05 / 0 2 / 1 0 08 / 1 0 / 1 0 w M e a s u r i n g P o i n t ( f t . ) TWN-1 Water Level Over Time (ft. blmp) 47.0 47.5 48.0 48.5 De p t h B e l o w 0.0 5.0 10.0 12 / 1 8 / 0 8 03 / 2 8 / 0 9 07 / 0 6 / 0 9 10 / 1 4 / 0 9 01 / 2 2 / 1 0 05 / 0 2 / 1 0 08 / 1 0 / 1 0 w M e a s u r i n g P o i n t ( f t . ) TWN-2 Water Level Over Time (ft. blmp) 15.0 20.0 25.0 De p t h B e l o w 30.6 30.8 31.0 31.2 31.4 12 / 1 8 / 0 8 03 / 2 8 / 0 9 07 / 0 6 / 0 9 10 / 1 4 / 0 9 01 / 2 2 / 1 0 05 / 0 2 / 1 0 08 / 1 0 / 1 0 w M e a s u r i n g P o i n t ( f t . ) TWN-3 Water Level Over Time (ft. blmp) 31.6 31.8 32.0 32.2 32.4 De p t h B e l o w 35.5 36.0 36.5 37.0 37.5 38.0 12 / 1 8 / 0 8 03 / 2 8 / 0 9 07 / 0 6 / 0 9 10 / 1 4 / 0 9 01 / 2 2 / 1 0 05 / 0 2 / 1 0 08 / 1 0 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-4 Water Level Over Time (ft. blmp) 38.5 39.0 39.5 40.0 40.5 41.0 De p t h B e l o w M 69.6 69.8 70.0 70.2 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-5 Water Level Over Time (ft. blmp) 70.4 70.6 70.8 De p t h B e l o w M 74.4 74.6 74.8 75.0 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-6 Water Level Over Time (ft. blmp) 75.2 75.4 75.6 De p t h B e l o w M 89.0 90.0 91.0 92.0 93.0 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-7 Water Level Over Time (ft. blmp) 94.0 95.0 96.0 97.0 98.0 De p t h B e l o w M 40.0 45.0 50.0 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-8 Water Level Over Time (ft. blmp) 55.0 60.0 65.0 De p t h B e l o w M 64.2 64.4 64.6 64.8 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-9 Water Level Over Time (ft. blmp) 65.0 65.2 65.4 65.6 De p t h B e l o w M 81.4 81.6 81.8 82.0 82.2 07 / 0 6 / 0 9 08 / 2 5 / 0 9 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-10 Water Level Over Time (ft. blmp) 82.4 82.6 82.8 83.0 De p t h B e l o w M 69.0 69.5 70.0 70.5 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-11 Water Level Over Time (ft. blmp) 71.0 71.5 72.0 De p t h B e l o w M 36.0 36.5 37.0 37.5 38.0 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-12 Water Level Over Time (ft. blmp) 38.5 39.0 39.5 40.0 40.5 De p t h B e l o w M 46.6 46.7 46.8 46.9 47.0 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-13 Water Level Over Time (ft. blmp) 47.1 47.2 47.3 47.4 47.5 De p t h B e l o w M 62.7 62.8 62.9 63.0 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-14 Water Level Over Time (ft. blmp) 63.1 63.2 63.3 63.4 De p t h B e l o w M 80.0 82.0 84.0 86.0 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-15 Water Level Over Time (ft. blmp) 88.0 90.0 92.0 94.0 De p t h B e l o w M 48.2 48.4 48.6 48.8 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-16 Water Level Over Time (ft. blmp) 49.0 49.2 49.4 49.6 De p t h B e l o w M 34.9 35.0 35.1 35.2 35.3 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-17 Water Level Over Time (ft. blmp) 35.4 35.5 35.6 35.7 De p t h B e l o w M 0.0 10.0 20.0 30.0 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-18 Water Level Over Time (ft. blmp) 40.0 50.0 60.0 70.0 De p t h B e l o w M 53.2 53.4 53.6 53.8 54.0 54.2 10 / 1 4 / 0 9 12 / 0 3 / 0 9 01 / 2 2 / 1 0 03 / 1 3 / 1 0 05 / 0 2 / 1 0 06 / 2 1 / 1 0 Mea s u r i n g P o i n t ( f t . ) TWN-19 Water Level Over Time (ft. blmp) 54.4 54.6 54.8 55.0 55.2 55.4 De p t h B e l o w M Tab F Depths to Groundwater and Elevations Over Time for Nitrate Monitoring Wells Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,646.96 5,648.09 1.13 112.5 5,600.38 02/06/09 47.71 46.58 5,599.99 07/21/09 48.10 46.97 5,600.26 09/21/09 47.83 46.70 5,601.10 10/28/09 46.99 45.86 5,602.59 12/14/09 45.50 44.37 5,600.55 03/11/10 47.54 46.41 5,600.66 05/11/10 47.43 46.30 Water Levels and Data over Time White Mesa Mill - Well TWN-1 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,625.75 5,626.69 0.94 95 5,611.37 02/06/09 15.32 14.38 5,610.63 07/21/09 16.06 15.12 5,609.73 9/21/2009 16.96 16.02 5,607.08 11/2/2009 19.61 18.67 5,606.57 12/14/2009 20.12 19.18 5,612.45 03/11/10 14.24 13.30 5,612.78 05/11/10 13.91 12.97 Water Levels and Data over Time White Mesa Mill - Well TWN-2 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,633.64 5,634.50 0.86 110 5,603.77 02/06/09 30.73 29.87 5,602.37 7/21/2009 32.13 31.27 5,602.34 9/21/2009 32.16 31.30 5,602.60 10/28/2009 31.90 31.04 5,603.12 12/14/2009 31.38 30.52 5,602.90 03/11/10 31.60 30.74 5,603.23 05/11/10 31.27 30.41 Water Levels and Data over Time White Mesa Mill - Well TWN-3 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,641.04 5,641.87 0.83 136 5,601.47 02/06/09 40.40 39.57 5,604.26 7/21/2009 37.61 36.78 5,605.02 9/21/2009 36.85 36.02 5,605.87 10/28/2009 36.00 35.17 5,605.81 12/14/2009 36.06 35.23 5,605.31 03/11/10 36.56 35.73 5,605.36 05/11/10 36.51 35.68 Water Levels and Data over Time White Mesa Mill - Well TWN-4 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,653.70 5,655.18 1.48 155 5,584.43 08/25/09 70.75 69.27 5,584.51 9/21/2009 70.67 69.19 5,584.54 11/10/2009 70.64 69.16 5,584.62 12/14/2009 70.56 69.08 5,584.97 03/11/10 70.21 68.73 5,585.38 05/11/10 69.8 68.32 Water Levels and Data over Time White Mesa Mill - Well TWN-5 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,663.03 5,664.94 1.91 135 5,589.52 08/25/09 75.42 73.51 5,589.46 9/22/2009 75.48 73.57 5,589.61 11/3/2009 75.33 73.42 5,589.92 12/14/2009 75.02 73.11 5,590.24 03/11/10 74.70 72.79 5,590.40 05/11/10 74.54 72.63 Water Levels and Data over Time White Mesa Mill - Well TWN-6 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,647.39 5,649.26 1.87 120 5,552.56 08/25/09 96.70 94.83 5,558.34 9/21/2009 90.92 89.05 5,558.82 11/10/2009 90.44 88.57 5,558.96 12/14/2009 90.30 88.43 5,559.54 03/11/10 89.72 87.85 5,559.60 05/11/10 89.66 87.79 Water Levels and Data over Time White Mesa Mill - Well TWN-7 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,649.35 5,651.48 2.13 160 5,589.01 08/25/09 62.47 60.34 5,589.10 9/21/2009 62.38 60.25 5,589.09 11/3/2009 62.39 60.26 5,603.38 12/14/2009 48.10 45.97 5,589.68 03/11/10 61.80 59.67 5,589.95 05/11/10 61.53 59.40 Water Levels and Data over Time White Mesa Mill - Well TWN-8 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,645.68 5,647.45 1.77 102.5 5,582.05 08/25/09 65.40 63.63 5,582.12 9/22/2009 65.33 63.56 5,582.27 11/10/2009 65.18 63.41 5,582.53 12/14/2009 64.92 63.15 5,582.92 03/11/10 64.53 62.76 5,583.06 05/11/10 64.39 62.62 Water Levels and Data over Time White Mesa Mill - Well TWN-9 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,664.63 5,666.98 2.35 107.5 5,584.18 08/25/09 82.80 80.45 5,584.40 9/22/2009 82.58 80.23 5,584.61 11/10/2009 82.37 80.02 5,584.90 12/14/2009 82.08 79.73 5,585.21 03/11/10 81.77 79.42 5,585.42 05/11/10 81.56 79.21 Water Levels and Data over Time White Mesa Mill - Well TWN-10 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,683.16 5,684.53 1.37 147.5 5,613.00 11/03/09 71.53 70.16 5,613.88 12/14/2009 70.65 69.28 5,614.65 03/11/10 69.88 68.51 5,615.16 05/11/10 69.37 68.00 Water Levels and Data over Time White Mesa Mill - Well TWN-11 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,667.03 5,668.24 1.21 115 5,628.33 11/03/09 39.91 38.70 5,628.86 12/14/2009 39.38 38.17 5,630.27 03/11/10 37.97 36.76 5,631.64 05/11/10 36.60 35.39 Water Levels and Data over Time White Mesa Mill - Well TWN-12 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,633.04 5,634.32 1.28 120 5,586.95 11/03/09 47.37 46.09 5,587.22 12/14/2009 47.1 45.82 5,587.45 03/11/10 46.87 45.59 5,587.64 05/11/10 46.68 45.40 Water Levels and Data over Time White Mesa Mill - Well TWN-13 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,647.80 5,649.53 1.73 135 5,586.18 11/04/09 63.35 61.62 5,586.51 12/14/2009 63.02 61.29 5,586.71 03/11/10 62.82 61.09 5,586.72 05/11/10 62.81 61.08 Water Levels and Data over Time White Mesa Mill - Well TWN-14 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,675.01 5,676.49 1.48 155 5,594.12 11/10/09 82.37 80.89 5,584.03 12/14/2009 92.46 90.98 5,584.10 03/11/10 92.39 90.91 5,584.16 05/11/10 92.33 90.85 Water Levels and Data over Time White Mesa Mill - Well TWN-15 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,651.07 5,652.70 1.63 100 5,603.34 11/04/09 49.36 47.73 5,603.56 12/14/2009 49.14 47.51 5,603.84 03/11/10 48.86 47.23 5,604.31 05/11/10 48.39 46.76 Water Levels and Data over Time White Mesa Mill - Well TWN-16 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,639.73 5,641.55 1.82 100 5,605.96 11/04/09 35.59 33.77 5,606.27 12/14/2009 35.28 33.46 5,606.25 03/11/10 35.30 33.48 5,606.55 05/11/10 35.00 33.18 Water Levels and Data over Time White Mesa Mill - Well TWN-17 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,643.95 5,645.45 1.50 100 5,586.85 11/02/09 58.60 57.10 5,600.14 12/14/2009 45.31 43.81 5,587.36 03/11/10 58.09 56.59 5,587.71 05/11/10 57.74 56.24 Water Levels and Data over Time White Mesa Mill - Well TWN -18 Water Elevation (WL) Land Surface (LSD) Measuring Point Elevation (MP) Length Of Riser (L) Date Of Monitoring Total or Measured Depth to Water (blw.MP) Total Depth to Water (blw.LSD) Total Depth Of Well 5,659.59 5,661.36 1.77 110 5,606.17 11/02/09 55.19 53.42 5,606.70 12/14/2009 54.66 52.89 5,607.22 03/11/10 54.14 52.37 5,607.89 05/11/10 53.47 51.70 Water Levels and Data over Time White Mesa Mill - Well TWN-19 Tab G Laboratory Analytical Reports ANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORT Any exceptions or problems with the analyses are noted in the Laboratory Analytical Report, the QA/QC Summary Report, or the Case Narrative. The results as reported relate only to the item(s) submitted for testing. If you have any questions regarding these test results, please call. Sample ID Client Sample ID Collect Date Receive Date Matrix Test Report Approved By: C10060090-001 TWN 15R 05/27/10 09:14 06/02/10 Aqueous Chloride Nitrogen, Nitrate + Nitrite C10060090-002 TWN 15 05/28/10 07:50 06/02/10 Aqueous Same As Above C10060090-003 TWN 7R 05/27/10 10:47 06/02/10 Aqueous Same As Above C10060090-004 TWN 7 05/28/10 07:35 06/02/10 Aqueous Same As Above C10060090-005 TWN 4R 05/27/10 12:55 06/02/10 Aqueous Same As Above C10060090-006 TWN 4 05/27/10 13:20 06/02/10 Aqueous Same As Above C10060090-007 TWN 16R 05/27/10 13:56 06/02/10 Aqueous Same As Above C10060090-008 TWN 16 05/27/10 14:23 06/02/10 Aqueous Same As Above C10060090-009 TWN 65 05/27/10 13:20 06/02/10 Aqueous Same As Above C10060090-010 Temp Blank 06/02/10 Aqueous Temperature C10060090-011 TWN 8R 05/26/10 08:50 06/02/10 Aqueous Chloride Nitrogen, Nitrate + Nitrite C10060090-012 TWN 8 05/26/10 09:33 06/02/10 Aqueous Same As Above C10060090-013 TWN 13R 05/26/10 10:05 06/02/10 Aqueous Same As Above C10060090-014 TWN 13 05/26/10 10:36 06/02/10 Aqueous Same As Above C10060090-015 TWN 5R 05/26/10 12:30 06/02/10 Aqueous Same As Above C10060090-016 TWN 5 05/26/10 12:56 06/02/10 Aqueous Same As Above C10060090-017 TWN 1R 05/26/10 13:30 06/02/10 Aqueous Same As Above C10060090-018 TWN 1 05/26/10 14:08 06/02/10 Aqueous Same As Above C10060090-019 TWN 12R 05/26/10 14:38 06/02/10 Aqueous Same As Above C10060090-020 TWN 12 05/26/10 15:04 06/02/10 Aqueous Same As Above Denison Mines USA Corp Project Name: 2nd Quarter Nitrate Workorder No.: C10060090 6425 S Hwy 191 Blanding, UT 84511 June 15, 2010 C2975 - Chloroform SamplingQuote ID: Energy Laboratories, Inc. received the following 20 samples for Denison Mines USA Corp on 6/2/2010 for analysis. Page 1 of 12 Digitally signed by Stephanie Waldrop Date: 2010.06.16 14:51:04 -06:00 Project:2nd Quarter Nitrate CLIENT:Denison Mines USA Corp Sample Delivery Group:C10060090 CASE NARRATIVE 06/15/10Report Date: ORIGINAL SAMPLE SUBMITTAL(S) All original sample submittals have been returned with the data package. 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. GROSS ALPHA ANALYSIS Method 900.0 for gross alpha and gross beta is intended as a drinking water method for low TDS waters. Data provided by this method for non potable waters should be viewed as inconsistent. RADON IN AIR ANALYSIS The desired exposure time is 48 hours (2 days). The time delay in returning the canister to the laboratory for processing should be as short as possible to avoid excessive decay. Maximum recommended delay between end of exposure to beginning of counting should not exceed 8 days. SOIL/SOLID SAMPLES All samples reported on an as received basis unless otherwise indicated. ATRAZINE, SIMAZINE AND PCB ANALYSIS Data for PCBs, Atrazine and Simazine are reported from EPA 525.2. PCB data reported by ELI reflects the results for seven individual Aroclors. When the results for all seven are ND (not detected), the sample meets EPA compliance criteria for PCB monitoring. SUBCONTRACTING ANALYSIS Subcontracting of sample analyses to an outside laboratory may be required. If so, ENERGY LABORATORIES will utilize its branch laboratories or qualified contract laboratories for this service. Any such laboratories will be indicated within the Laboratory Analytical Report. BRANCH LABORATORY LOCATIONS eli-b - Energy Laboratories, Inc. - Billings, MT eli-g - Energy Laboratories, Inc. - Gillette, WY eli-h - Energy Laboratories, Inc. - Helena, MT eli-r - Energy Laboratories, Inc. - Rapid City, SD eli-t - Energy Laboratories, Inc. - College Station, TX CERTIFICATIONS: USEPA: WY00002, Radiochemical WY00937; FL-DOH NELAC: E87641, Radiochemical E871017; California: 02118CA; Oregon: WY200001; Utah: 3072350515; Virginia: 00057; Washington: C1903 ISO 17025 DISCLAIMER: The results of this Analytical Report relate only to the items submitted for analysis. ENERGY LABORATORIES, INC. - CASPER,WY certifies that certain method selections contained in this report meet requirements as set forth by the above accrediting authorities. Some results requested by the client may not be covered under these certifications. All analysis data to be submitted for regulatory enforcement should be certified in the sample state of origin. Please verify ELI's certification coverage by visiting www.energylab.com ELI appreciates the opportunity to provide you with this analytical service. For additional information and services visit our web page www.energylab.com. Page 2 of 12 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/15/10 Collection Date:05/27/10 09:14Lab ID:C10060090-001 Client Sample ID:TWN 15R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:23 / lr1mg/LNDChloride A4500-Cl B 06/12/10 15:21 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/28/10 07:50Lab ID:C10060090-002 Client Sample ID:TWN 15 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:26 / lr1mg/L39Chloride A4500-Cl B D 06/12/10 15:31 / ljl0.2mg/L1.0Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/27/10 10:47Lab ID:C10060090-003 Client Sample ID:TWN 7R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:28 / lr1mg/LNDChloride A4500-Cl B 06/12/10 15:34 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/28/10 07:35Lab ID:C10060090-004 Client Sample ID:TWN 7 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:30 / lr1mg/L6Chloride A4500-Cl B D 06/12/10 15:36 / ljl0.2mg/L1.2Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit. MCL - Maximum contaminant level. QCL - Quality control limit. ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 3 of 12 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/15/10 Collection Date:05/27/10 12:55Lab ID:C10060090-005 Client Sample ID:TWN 4R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:32 / lr1mg/LNDChloride A4500-Cl B 06/12/10 15:41 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/27/10 13:20Lab ID:C10060090-006 Client Sample ID:TWN 4 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:35 / lr1mg/L22Chloride A4500-Cl B D 06/12/10 15:44 / ljl0.2mg/L1.0Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/27/10 13:56Lab ID:C10060090-007 Client Sample ID:TWN 16R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:36 / lr1mg/LNDChloride A4500-Cl B 06/12/10 15:51 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/27/10 14:23Lab ID:C10060090-008 Client Sample ID:TWN 16 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:39 / lr1mg/L35Chloride A4500-Cl B D 06/12/10 15:54 / ljl0.2mg/L1.3Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit. MCL - Maximum contaminant level. QCL - Quality control limit. ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 4 of 12 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/15/10 Collection Date:05/27/10 13:20Lab ID:C10060090-009 Client Sample ID:TWN 65 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:41 / lr1mg/L22Chloride A4500-Cl B 06/12/10 15:56 / ljl0.1mg/L1.0Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:Not ProvidedLab ID:C10060090-010 Client Sample ID:Temp Blank DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous PHYSICAL PROPERTIES 06/02/10 09:15 / kbh°C4.0Temperature E170.1 Collection Date:05/26/10 08:50Lab ID:C10060090-011 Client Sample ID:TWN 8R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:47 / lr1mg/LNDChloride A4500-Cl B 06/12/10 15:59 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 09:33Lab ID:C10060090-012 Client Sample ID:TWN 8 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:49 / lr1mg/L11Chloride A4500-Cl B 06/12/10 16:01 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit. MCL - Maximum contaminant level. QCL - Quality control limit. ND - Not detected at the reporting limit. Page 5 of 12 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/15/10 Collection Date:05/26/10 10:05Lab ID:C10060090-013 Client Sample ID:TWN 13R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:52 / lr1mg/LNDChloride A4500-Cl B 06/12/10 16:11 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 10:36Lab ID:C10060090-014 Client Sample ID:TWN 13 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:54 / lr1mg/L49Chloride A4500-Cl B 06/12/10 16:14 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 12:30Lab ID:C10060090-015 Client Sample ID:TWN 5R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:56 / lr1mg/LNDChloride A4500-Cl B 06/12/10 16:16 / ljl0.1mg/L0.2Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 12:56Lab ID:C10060090-016 Client Sample ID:TWN 5 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:57 / lr1mg/L44Chloride A4500-Cl B 06/12/10 16:19 / ljl0.1mg/L0.3Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit. MCL - Maximum contaminant level. QCL - Quality control limit. ND - Not detected at the reporting limit. Page 6 of 12 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/15/10 Collection Date:05/26/10 13:30Lab ID:C10060090-017 Client Sample ID:TWN 1R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 14:59 / lr1mg/LNDChloride A4500-Cl B 06/12/10 16:21 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 14:08Lab ID:C10060090-018 Client Sample ID:TWN 1 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:00 / lr1mg/L20Chloride A4500-Cl B 06/12/10 16:31 / ljl0.1mg/L0.6Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 14:38Lab ID:C10060090-019 Client Sample ID:TWN 12R DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:02 / lr1mg/LNDChloride A4500-Cl B 06/12/10 16:34 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:05/26/10 15:04Lab ID:C10060090-020 Client Sample ID:TWN 12 DateReceived:06/02/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:05 / lr1mg/L106Chloride A4500-Cl B 06/12/10 16:36 / ljl0.1mg/L0.8Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit. MCL - Maximum contaminant level. QCL - Quality control limit. ND - Not detected at the reporting limit. Page 7 of 12 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060090 QA/QC Summary Report 06/15/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: A4500-Cl B Batch: 100608-CL-TTR-W Sample ID: MBLK9-100608 06/08/10 14:09Method Blank Run: TITRATION_100608A Chloride 0.4ND mg/L Sample ID: C10060090-009AMS 06/08/10 14:44Sample Matrix Spike Run: TITRATION_100608A Chloride 100 90 1101.057.7 mg/L Sample ID: C10060090-009AMSD 06/08/10 14:45Sample Matrix Spike Duplicate Run: TITRATION_100608A Chloride 98 90 110 101.0 1.257.0 mg/L Sample ID: C10060090-020AMS 06/08/10 15:07Sample Matrix Spike Run: TITRATION_100608A Chloride 101 90 1101.0285 mg/L Sample ID: C10060090-020AMSD 06/08/10 15:08Sample Matrix Spike Duplicate Run: TITRATION_100608A Chloride 102 90 110 101.0 0.6287 mg/L Sample ID: LCS35-100608 06/08/10 15:12Laboratory Control Sample Run: TITRATION_100608A Chloride 100 90 1101.03540 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 8 of 12 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060090 QA/QC Summary Report 06/15/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: E353.2 Batch: R133758 Sample ID: MBLK-1 06/12/10 13:46Method Blank Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 0.04ND mg/L Sample ID: LCS-2 06/12/10 13:49Laboratory Control Sample Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 97 90 1100.102.42 mg/L Sample ID: C10060090-001BMS 06/12/10 15:24Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 99 90 1100.102.06 mg/L Sample ID: C10060090-001BMSD 06/12/10 15:26Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 98 90 110 100.10 12.04 mg/L Sample ID: C10060090-012BMS 06/12/10 16:04Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 101 90 1100.102.02 mg/L Sample ID: C10060090-012BMSD 06/12/10 16:06Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 99 90 110 100.10 21.98 mg/L Sample ID: C10060092-003CMS 06/12/10 16:44Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 103 90 1100.102.11 mg/L Sample ID: C10060092-003CMSD 06/12/10 16:46Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 108 90 110 100.10 4.62.21 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 9 of 12 Page 10 of 12 Page 11 of 12 Page 12 of 12 ANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORT Sample ID Client Sample ID Collect Date Receive Date Matrix Test C10060208-001 TWN 11R 06/01/10 07:52 06/04/10 Aqueous Chloride Nitrogen, Nitrate + Nitrite C10060208-002 TWN 11 06/01/10 08:20 06/04/10 Aqueous Same As Above C10060208-003 TWN 6R 06/01/10 08:56 06/04/10 Aqueous Same As Above C10060208-004 TWN 6 06/01/10 09:18 06/04/10 Aqueous Same As Above C10060208-005 TWN 10R 06/01/10 09:52 06/04/10 Aqueous Same As Above C10060208-006 TWN 10 06/02/10 12:10 06/04/10 Aqueous Same As Above C10060208-007 TWN 18R 06/01/10 10:44 06/04/10 Aqueous Same As Above C10060208-008 TWN 18 06/01/10 11:14 06/04/10 Aqueous Same As Above C10060208-009 TWN 14R 06/01/10 12:16 06/04/10 Aqueous Same As Above C10060208-010 TWN 14 06/02/10 12:21 06/04/10 Aqueous Same As Above C10060208-011 TWN 19R 06/01/10 13:15 06/04/10 Aqueous Same As Above C10060208-012 TWN 19 06/01/10 13:40 06/04/10 Aqueous Same As Above C10060208-013 TWN 9R 06/01/10 14:15 06/04/10 Aqueous Same As Above C10060208-014 TWN 9 06/01/10 14:39 06/04/10 Aqueous Same As Above C10060208-015 TWN 17R 06/02/10 07:45 06/04/10 Aqueous Same As Above C10060208-016 TWN 17 06/03/10 07:07 06/04/10 Aqueous Same As Above C10060208-017 TWN 3R 06/02/10 08:41 06/04/10 Aqueous Same As Above C10060208-018 TWN 3 06/03/10 07:18 06/04/10 Aqueous Same As Above C10060208-019 TWN 2R 06/02/10 09:29 06/04/10 Aqueous Same As Above C10060208-020 TWN 2 06/02/10 09:51 06/04/10 Aqueous Same As Above C10060208-021 TWN 70 06/02/10 09:51 06/04/10 Aqueous Same As Above C10060208-022 Piez 1 06/02/10 13:52 06/04/10 Aqueous Same As Above C10060208-023 Piez 2 06/02/10 14:11 06/04/10 Aqueous Same As Above C10060208-024 Piez 3 06/02/10 14:28 06/04/10 Aqueous Same As Above C10060208-025 UWLP 06/02/10 10:30 06/04/10 Aqueous Same As Above C10060208-026 Temp Blank 06/03/10 00:00 06/04/10 Aqueous Temperature Denison Mines USA Corp Project Name: 2nd Quarter Nitrate Workorder No.: C10060208 6425 S Hwy 191 Blanding, UT 84511 June 16, 2010 C3317 - Nitrate and Chloride SamplingQuote ID: Energy Laboratories, Inc. received the following 26 samples for Denison Mines USA Corp on 6/4/2010 for analysis. Page 1 of 16 ANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORT This report was prepared by Energy Laboratories, Inc., 2393 Salt Creek Hwy., Casper, WY 82601. Any exceptions or problems with the analyses are noted in the Laboratory Analytical Report, the QA/QC Summary Report, or the Case Narrative. The results as reported relate only to the item(s) submitted for testing. If you have any questions regarding these test results, please call. Report Approved By: Page 2 of 16 Project:2nd Quarter Nitrate CLIENT:Denison Mines USA Corp Sample Delivery Group:C10060208 CASE NARRATIVE 06/16/10Report Date: ORIGINAL SAMPLE SUBMITTAL(S) All original sample submittals have been returned with the data package. 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. GROSS ALPHA ANALYSIS Method 900.0 for gross alpha and gross beta is intended as a drinking water method for low TDS waters. Data provided by this method for non potable waters should be viewed as inconsistent. RADON IN AIR ANALYSIS The desired exposure time is 48 hours (2 days). The time delay in returning the canister to the laboratory for processing should be as short as possible to avoid excessive decay. Maximum recommended delay between end of exposure to beginning of counting should not exceed 8 days. SOIL/SOLID SAMPLES All samples reported on an as received basis unless otherwise indicated. ATRAZINE, SIMAZINE AND PCB ANALYSIS Data for PCBs, Atrazine and Simazine are reported from EPA 525.2. PCB data reported by ELI reflects the results for seven individual Aroclors. When the results for all seven are ND (not detected), the sample meets EPA compliance criteria for PCB monitoring. SUBCONTRACTING ANALYSIS Subcontracting of sample analyses to an outside laboratory may be required. If so, ENERGY LABORATORIES will utilize its branch laboratories or qualified contract laboratories for this service. Any such laboratories will be indicated within the Laboratory Analytical Report. BRANCH LABORATORY LOCATIONS eli-b - Energy Laboratories, Inc. - Billings, MT eli-g - Energy Laboratories, Inc. - Gillette, WY eli-h - Energy Laboratories, Inc. - Helena, MT eli-r - Energy Laboratories, Inc. - Rapid City, SD eli-t - Energy Laboratories, Inc. - College Station, TX CERTIFICATIONS: USEPA: WY00002, Radiochemical WY00937; FL-DOH NELAC: E87641, Radiochemical E871017; California: 02118CA; Oregon: WY200001; Utah: 3072350515; Virginia: 00057; Washington: C1903 ISO 17025 DISCLAIMER: The results of this Analytical Report relate only to the items submitted for analysis. ENERGY LABORATORIES, INC. - CASPER,WY certifies that certain method selections contained in this report meet requirements as set forth by the above accrediting authorities. Some results requested by the client may not be covered under these certifications. All analysis data to be submitted for regulatory enforcement should be certified in the sample state of origin. Please verify ELI's certification coverage by visiting www.energylab.com ELI appreciates the opportunity to provide you with this analytical service. For additional information and services visit our web page www.energylab.com. Page 3 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/01/10 07:52Lab ID:C10060208-001 Client Sample ID:TWN 11R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:25 / lr1mg/LNDChloride A4500-Cl B 06/12/10 19:56 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 08:20Lab ID:C10060208-002 Client Sample ID:TWN 11 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:27 / lr1mg/L72Chloride A4500-Cl B D 06/12/10 19:59 / ljl0.2mg/L1.3Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 08:56Lab ID:C10060208-003 Client Sample ID:TWN 6R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:28 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:01 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 09:18Lab ID:C10060208-004 Client Sample ID:TWN 6 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:30 / lr1mg/L22Chloride A4500-Cl B D 06/12/10 20:04 / ljl0.2mg/L1.4Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 4 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/01/10 09:52Lab ID:C10060208-005 Client Sample ID:TWN 10R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:31 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:14 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 12:10Lab ID:C10060208-006 Client Sample ID:TWN 10 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:33 / lr1mg/L30Chloride A4500-Cl B D 06/12/10 20:26 / ljl0.2mg/L1.0Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 10:44Lab ID:C10060208-007 Client Sample ID:TWN 18R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:34 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:19 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 11:14Lab ID:C10060208-008 Client Sample ID:TWN 18 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:38 / lr1mg/L63Chloride A4500-Cl B D 06/12/10 20:21 / ljl0.2mg/L1.8Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 5 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/01/10 12:16Lab ID:C10060208-009 Client Sample ID:TWN 14R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 15:44 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:24 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 12:21Lab ID:C10060208-010 Client Sample ID:TWN 14 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:00 / lr1mg/L30Chloride A4500-Cl B D 06/12/10 20:36 / ljl0.5mg/L2.9Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 13:15Lab ID:C10060208-011 Client Sample ID:TWN 19R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:01 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:41 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 13:40Lab ID:C10060208-012 Client Sample ID:TWN 19 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:05 / lr1mg/L113Chloride A4500-Cl B D 06/12/10 20:44 / ljl0.5mg/L6.2Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 6 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/01/10 14:15Lab ID:C10060208-013 Client Sample ID:TWN 9R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:06 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:46 / ljl0.1mg/L0.1Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/01/10 14:39Lab ID:C10060208-014 Client Sample ID:TWN 9 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:09 / lr1mg/L175Chloride A4500-Cl B D 06/12/10 20:49 / ljl0.5mg/L7.7Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 07:45Lab ID:C10060208-015 Client Sample ID:TWN 17R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:11 / lr1mg/LNDChloride A4500-Cl B 06/12/10 20:59 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/03/10 07:07Lab ID:C10060208-016 Client Sample ID:TWN 17 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:13 / lr1mg/L87Chloride A4500-Cl B D 06/12/10 21:04 / ljl1mg/L11Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 7 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/02/10 08:41Lab ID:C10060208-017 Client Sample ID:TWN 3R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:14 / lr1mg/LNDChloride A4500-Cl B 06/12/10 21:06 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/03/10 07:18Lab ID:C10060208-018 Client Sample ID:TWN 3 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:15 / lr1mg/L118Chloride A4500-Cl B D 06/12/10 21:09 / ljl2mg/L26Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 09:29Lab ID:C10060208-019 Client Sample ID:TWN 2R DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:25 / lr1mg/LNDChloride A4500-Cl B 06/12/10 21:11 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 09:51Lab ID:C10060208-020 Client Sample ID:TWN 2 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:28 / lr1mg/L97Chloride A4500-Cl B D 06/12/10 21:19 / ljl5mg/L69Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 8 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/02/10 09:51Lab ID:C10060208-021 Client Sample ID:TWN 70 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:29 / lr1mg/L92Chloride A4500-Cl B D 06/12/10 21:21 / ljl5mg/L68Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 13:52Lab ID:C10060208-022 Client Sample ID:Piez 1 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:31 / lr1mg/L52Chloride A4500-Cl B D 06/12/10 21:24 / ljl0.5mg/L7.2Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 14:11Lab ID:C10060208-023 Client Sample ID:Piez 2 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:33 / lr1mg/L8Chloride A4500-Cl B 06/12/10 21:26 / ljl0.1mg/L0.6Nitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/02/10 14:28Lab ID:C10060208-024 Client Sample ID:Piez 3 DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:35 / lr1mg/L36Chloride A4500-Cl B D 06/12/10 21:29 / ljl0.2mg/L1.6Nitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. D - RL increased due to sample matrix. Page 9 of 16 LABORATORY ANALYTICAL REPORT Site Name:2nd Quarter Nitrate Client:Denison Mines USA Corp Report Date:06/16/10 Collection Date:06/02/10 10:30Lab ID:C10060208-025 Client Sample ID:UWLP DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous MAJOR IONS 06/08/10 16:37 / lr1mg/LNDChloride A4500-Cl B 06/12/10 21:39 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Collection Date:06/03/10Lab ID:C10060208-026 Client Sample ID:Temp Blank DateReceived:06/04/10 Analyses Result Units Analysis Date / ByRL Method MCL/ QCLQualifiers Matrix:Aqueous PHYSICAL PROPERTIES 06/04/10 09:00 / kbh°C3.0Temperature E170.1 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. Page 10 of 16 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060208 QA/QC Summary Report 06/16/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: A4500-Cl B Batch: 100608-CL-TTR-W Sample ID: MBLK9-100608 06/08/10 14:09Method Blank Run: TITRATION_100608A Chloride 0.4ND mg/L Sample ID: LCS35-100608 06/08/10 15:12Laboratory Control Sample Run: TITRATION_100608A Chloride 100 90 1101.03540 mg/L Sample ID: C10060208-004AMS 06/08/10 15:40Sample Matrix Spike Run: TITRATION_100608A Chloride 100 90 1101.057.7 mg/L Sample ID: C10060208-004AMSD 06/08/10 15:42Sample Matrix Spike Duplicate Run: TITRATION_100608A Chloride 101 90 110 101.0 0.658.0 mg/L Sample ID: C10060208-018AMS 06/08/10 16:17Sample Matrix Spike Run: TITRATION_100608A Chloride 101 90 1101.0297 mg/L Sample ID: C10060208-018AMSD 06/08/10 16:19Sample Matrix Spike Duplicate Run: TITRATION_100608A Chloride 99 90 110 101.0 1.2294 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 11 of 16 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060208 QA/QC Summary Report 06/16/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: E353.2 Batch: R133758 Sample ID: MBLK-1 06/12/10 13:46Method Blank Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 0.04ND mg/L Sample ID: LCS-2 06/12/10 13:49Laboratory Control Sample Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 97 90 1100.102.42 mg/L Sample ID: C10060208-003BMS 06/12/10 20:06Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 96 90 1100.102.03 mg/L Sample ID: C10060208-003BMSD 06/12/10 20:09Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 101 90 110 100.10 4.82.13 mg/L Sample ID: C10060208-013BMS 06/12/10 20:54Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 99 90 1100.102.08 mg/L Sample ID: C10060208-013BMSD 06/12/10 21:01Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 98 90 110 100.10 0.52.07 mg/L Sample ID: C10060208-023BMS 06/12/10 21:31Sample Matrix Spike Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 99 90 1100.102.55 mg/L Sample ID: C10060208-023BMSD 06/12/10 21:34Sample Matrix Spike Duplicate Run: TECHNICON_100612A Nitrogen, Nitrate+Nitrite as N 102 90 110 100.10 2.32.61 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 12 of 16 Page 13 of 16 Page 14 of 16 Page 15 of 16 Page 16 of 16 ANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORTANALYTICAL SUMMARY REPORT This report was prepared by Energy Laboratories, Inc., 2393 Salt Creek Hwy., Casper, WY 82601. Any exceptions or problems with the analyses are noted in the Laboratory Analytical Report, the QA/QC Summary Report, or the Case Narrative. The results as reported relate only to the item(s) submitted for testing. If you have any questions regarding these test results, please call. Sample ID Client Sample ID Collect Date Receive Date Matrix Test Report Approved By: C10060490-001 TWN-60 06/10/10 08:20 06/11/10 Aqueous Chloride Nitrogen, Nitrate + Nitrite C10060490-002 Temp Blank 06/10/10 00:00 06/11/10 Aqueous Temperature Denison Mines USA Corp Project Name: 2nd Quarter Nitrate Workorder No.: C10060490 6425 S Hwy 191 Blanding, UT 84511 June 24, 2010 C3317 - Nitrate and Chloride SamplingQuote ID: Energy Laboratories, Inc. received the following 2 samples for Denison Mines USA Corp on 6/11/2010 for analysis. Page 1 of 8 Project:2nd Quarter Nitrate CLIENT:Denison Mines USA Corp Sample Delivery Group:C10060490 CASE NARRATIVE 06/24/10Report Date: ORIGINAL SAMPLE SUBMITTAL(S) All original sample submittals have been returned with the data package. 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. GROSS ALPHA ANALYSIS Method 900.0 for gross alpha and gross beta is intended as a drinking water method for low TDS waters. Data provided by this method for non potable waters should be viewed as inconsistent. RADON IN AIR ANALYSIS The desired exposure time is 48 hours (2 days). The time delay in returning the canister to the laboratory for processing should be as short as possible to avoid excessive decay. Maximum recommended delay between end of exposure to beginning of counting should not exceed 8 days. SOIL/SOLID SAMPLES All samples reported on an as received basis unless otherwise indicated. ATRAZINE, SIMAZINE AND PCB ANALYSIS Data for PCBs, Atrazine and Simazine are reported from EPA 525.2. PCB data reported by ELI reflects the results for seven individual Aroclors. When the results for all seven are ND (not detected), the sample meets EPA compliance criteria for PCB monitoring. SUBCONTRACTING ANALYSIS Subcontracting of sample analyses to an outside laboratory may be required. If so, ENERGY LABORATORIES will utilize its branch laboratories or qualified contract laboratories for this service. Any such laboratories will be indicated within the Laboratory Analytical Report. BRANCH LABORATORY LOCATIONS eli-b - Energy Laboratories, Inc. - Billings, MT eli-g - Energy Laboratories, Inc. - Gillette, WY eli-h - Energy Laboratories, Inc. - Helena, MT eli-r - Energy Laboratories, Inc. - Rapid City, SD eli-t - Energy Laboratories, Inc. - College Station, TX CERTIFICATIONS: USEPA: WY00002, Radiochemical WY00937; FL-DOH NELAC: E87641, Radiochemical E871017; California: 02118CA; Oregon: WY200001; Utah: 3072350515; Virginia: 00057; Washington: C1903 ISO 17025 DISCLAIMER: The results of this Analytical Report relate only to the items submitted for analysis. ENERGY LABORATORIES, INC. - CASPER,WY certifies that certain method selections contained in this report meet requirements as set forth by the above accrediting authorities. Some results requested by the client may not be covered under these certifications. All analysis data to be submitted for regulatory enforcement should be certified in the sample state of origin. Please verify ELI's certification coverage by visiting www.energylab.com ELI appreciates the opportunity to provide you with this analytical service. For additional information and services visit our web page www.energylab.com. Page 2 of 8 LABORATORY ANALYTICAL REPORT Client:Denison Mines USA Corp Project:2nd Quarter Nitrate Lab ID:C10060490-001 Client Sample ID:TWN-60 Collection Date:06/10/10 08:20 Matrix:Aqueous Report Date:06/24/10 DateReceived:06/11/10 Analyses Result Units Analysis Date / ByRLMethod MCL/ QCLQualifier MAJOR IONS 06/15/10 11:58 / lr1mg/LNDChloride A4500-Cl B 06/22/10 16:50 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 MAJOR IONS 06/15/10 11:58 / lr1mg/LNDChloride A4500-Cl B 06/22/10 16:50 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 MAJOR IONS 06/15/10 11:58 / lr1mg/LNDChloride A4500-Cl B 06/22/10 16:50 / ljl0.1mg/LNDNitrogen, Nitrate+Nitrite as N E353.2 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. Page 3 of 8 LABORATORY ANALYTICAL REPORT Client:Denison Mines USA Corp Project:2nd Quarter Nitrate Lab ID:C10060490-002 Client Sample ID:Temp Blank Collection Date:06/10/10 Matrix:Aqueous Report Date:06/24/10 DateReceived:06/11/10 Analyses Result Units Analysis Date / ByRLMethod MCL/ QCLQualifier PHYSICAL PROPERTIES 06/11/10 09:15 / kbh°C3.0Temperature E170.1 PHYSICAL PROPERTIES 06/11/10 09:15 / kbh°C3.0Temperature E170.1 PHYSICAL PROPERTIES 06/11/10 09:15 / kbh°C3.0Temperature E170.1 Report Definitions: RL - Analyte reporting limit.MCL - Maximum contaminant level. QCL - Quality control limit.ND - Not detected at the reporting limit. Page 4 of 8 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060490 QA/QC Summary Report 06/24/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: A4500-Cl B Batch: 100615-CL-TTR-W Sample ID: MBLK9-100615 06/15/10 09:43Method Blank Run: TITRATION_100615A Chloride 0.4ND mg/L Sample ID: LCS35-100615 06/15/10 10:59Laboratory Control Sample Run: TITRATION_100615A Chloride 102 90 1101.03610 mg/L Sample ID: C10060476-037AMS 06/15/10 11:47Sample Matrix Spike Run: TITRATION_100615A Chloride 101 90 1101.0210 mg/L Sample ID: C10060476-037AMSD 06/15/10 11:49Sample Matrix Spike Duplicate Run: TITRATION_100615A Chloride 103 90 110 101.0 1.6214 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 5 of 8 Project:2nd Quarter Nitrate Client:Denison Mines USA Corp Work Order:C10060490 QA/QC Summary Report 06/24/10Report Date: Analyte Result %REC RPDLow Limit High Limit RPDLimitRLUnits QualCount Method: E353.2 Batch: R134138 Sample ID: MBLK-1 06/22/10 15:05Method Blank Run: TECHNICON_100622A Nitrogen, Nitrate+Nitrite as N 0.04ND mg/L Sample ID: LCS-2 06/22/10 15:07Laboratory Control Sample Run: TECHNICON_100622A Nitrogen, Nitrate+Nitrite as N 98 90 1100.102.46 mg/L Sample ID: C10060478-006EMS 06/22/10 16:40Sample Matrix Spike Run: TECHNICON_100622A Nitrogen, Nitrate+Nitrite as N 96 90 1100.101.92 mg/L Sample ID: C10060478-006EMSD 06/22/10 16:43Sample Matrix Spike Duplicate Run: TECHNICON_100622A Nitrogen, Nitrate+Nitrite as N 98 90 110 100.10 1.61.95 mg/L Qualifiers: RL - Analyte reporting limit.ND - Not detected at the reporting limit. Page 6 of 8 Page 7 of 8 Page 8 of 8 Tab H Quality Assurance and Data Validation Tables H-1 Field Data QA/QC Evaluation Location 2x Casing Volume Volume Pumped Volume Check RPD RPD RPD RPD RPD Piezometer 1 -- -- -- -- -- Piezometer 2 -- -- -- -- -- Piezometer 3 -- -- -- -- -- TWN-1 79.52 80.00 OK 759.3 759.2 0.01 7.12 7.12 0.00 15.08 15.09 0.07 418 419 0.24 39.4 40.1 1.76 TWN-2 106.61 110.00 OK 3430 3427 0.09 6.43 6.47 0.62 12.51 12.63 0.95 424 424 0.00 19.5 22 12.05 TWN-3 84.04 70.00 Not Sufficient 2654 0 200.00 6.84 0 200.00 14.53 0 200.00 432 0 200.00 404.1 0 200.00 TWN-4 115.97 120.00 OK 1007 1007 0.00 6.84 6.83 0.15 14.66 14.7 0.27 450 450 0.00 78.2 76.1 2.72 TWN-5 104.35 110.00 OK 3103 3104 0.03 6.56 6.55 0.15 14.82 14.81 0.07 440 440 0.00 1.2 1.2 0.00 TWN-6 72.03 90.00 OK 1540 1545 0.32 6.8 6.79 0.15 14.62 14.61 0.07 436 437 0.23 29.3 48.3 48.97 TWN-7 59.31 15.00 Not Sufficient 1208 1208 0.00 7.52 7.45 0.94 15.69 15.34 2.26 407 407 0.00 11.9 6.6 57.30 TWN-8 109.18 110.00 OK 2418 2427 0.37 7.11 7.08 0.42 14.51 14.5 0.07 170 165 2.99 12.4 11.9 4.12 TWN-9 42.42 50.00 OK 2515 2525 0.40 6.69 6.64 0.75 15.37 15.03 2.24 406 409 0.74 44.6 49.4 10.21 TWN-10 30.30 35.00 OK 3808 4058 6.36 4.38 4.56 4.03 15.08 14.94 0.93 442 441 0.23 51.7 97.3 61.21 TWN-11 94.45 100.00 OK 2766 2769 0.11 6.66 6.66 0.00 14.83 14.84 0.07 461 460 0.22 35.3 39.6 11.48 TWN-12 95.72 110.00 OK 2523 2527 0.16 6.81 6.82 0.15 14.66 14.67 0.07 216 218 0.92 78.1 80.4 2.90 TWN-13 95.47 100.00 OK 1273 1254 1.50 7.51 7.5 0.13 15 15 0.00 356 345 3.14 30.4 22.4 30.30 TWN-14 94.05 50.00 Not Sufficient 1184 1185 0.08 7.27 7.33 0.82 16.81 15.56 7.72 404 401 0.75 90.1 199.1 75.38 TWN-15 81.78 20.00 Not Sufficient 1622 1758 8.05 6.86 6.59 4.01 14.92 14.7 1.49 456 460 0.87 100.9 172.1 52.16 TWN-16 67.06 80.00 OK 1853 1849 0.22 6.77 6.76 0.15 15.03 14.98 0.33 421 421 0.00 28.7 11.6 84.86 TWN-17 97.45 90.00 Not Sufficient 1044 1085 3.85 7.02 7.07 0.71 14.71 14.68 0.20 451 450 0.22 155.2 138.2 11.59 TWN-18 113.49 120.00 OK 2163 2168 0.23 6.61 6.63 0.30 14.55 14.55 0.00 479 479 0.00 32.8 31.8 3.10 TWN-19 73.53 80.00 OK 2000 1998 0.10 7.02 7.02 0.00 15.09 15.04 0.33 421 422 0.24 65.7 31.8 69.54 UWLP 193.1 192.7 0.21 9.03 9.58 5.91 19.64 19.75 0.56 378 372 1.60 2.3 2.6 12.24 Piezometers 1, 2, and 3 were not pumped, only one set of parameters were taken. TWN-3, TWN-7, TWN-14, TWN-15, and TWN-17 were pumped dry. UWLP is a pond grab sample, no pumping was required. Conductivity pH 11.12 19.28 21.37 19 Temp 6.42 7.22 Turbidity 485 341 234 2.2 7.9 34.9 Redox Potential -- -- -- -- 3007 5581 2237 H-2: Holding Time Evaluation Location Constituent Allowed Holding Time Holding Time Check Piezometer 1 Chloride 6.00 days 28 days OK Piezometer 1 Nitrogen 10.00 days 28 days OK Piezometer 2 Chloride 6.00 days 28 days OK Piezometer 2 Nitrogen 10.00 days 28 days OK Piezometer 3 Chloride 6.00 days 28 days OK Piezometer 3 Nitrogen 10.00 days 28 days OK TWN-1 Chloride 13.00 days 28 days OK TWN-1 Nitrogen 17.00 days 28 days OK TWN-2 Chloride 6.00 days 28 days OK TWN-2 Nitrogen 10.00 days 28 days OK TWN-3 Chloride 5.00 days 28 days OK TWN-3 Nitrogen 9.00 days 28 days OK TWN-4 Chloride 12.00 days 28 days OK TWN-4 Nitrogen 16.00 days 28 days OK TWN-5 Chloride 13.00 days 28 days OK TWN-5 Nitrogen 17.00 days 28 days OK TWN-6 Chloride 7.00 days 28 days OK TWN-6 Nitrogen 11.00 days 28 days OK TWN-7 Chloride 11.00 days 28 days OK TWN-7 Nitrogen 15.00 days 28 days OK TWN-8 Chloride 13.00 days 28 days OK TWN-8 Nitrogen 17.00 days 28 days OK TWN-9 Chloride 7.00 days 28 days OK TWN-9 Nitrogen 11.00 days 28 days OK TWN-10 Chloride 6.00 days 28 days OK TWN-10 Nitrogen 10.00 days 28 days OK TWN-11 Chloride 7.00 days 28 days OK TWN-11 Nitrogen 11.00 days 28 days OK TWN-12 Chloride 13.00 days 28 days OK TWN-12 Nitrogen 17.00 days 28 days OK TWN-13 Chloride 13.00 days 28 days OK TWN-13 Nitrogen 17.00 days 28 days OK TWN-14 Chloride 6.00 days 28 days OK TWN-14 Nitrogen 10.00 days 28 days OK TWN-15 Chloride 11.00 days 28 days OK TWN-15 Nitrogen 15.00 days 28 days OK TWN-16 Chloride 12.00 days 28 days OK TWN-16 Nitrogen 16.00 days 28 days OK TWN-17 Chloride 5.00 days 28 days OK TWN-17 Nitrogen 9.00 days 28 days OK TWN-18 Chloride 7.00 days 28 days OK TWN-18 Nitrogen 11.00 days 28 days OK TWN-19 Chloride 7.00 days 28 days OK TWN-19 Nitrogen 11.00 days 28 days OK TWN-65 Chloride 12.00 days 28 days OK TWN-65 Nitrogen 16.00 days 28 days OK TWN-70 Chloride 6.00 days 28 days OK Holding Time H-2: Holding Time Evaluation Location Constituent Allowed Holding Time Holding Time CheckHolding Time TWN-70 Nitrogen 10.00 days 28 days OK UWLP Chloride 6.00 days 28 days OK UWLP Nitrogen 10.00 days 28 days OK H-3: Analytical Method Check Parameter Method Method Used by Lab Nitrate E353.2 E353.2 Chloride A4500-Cl B A4500-Cl B Both Nitrate and Chloride were analyzed with the correct analytical method. H-4: Reporting Limit Evaluation Location Constituent Qualifier Qualifier Check Piezometer 1 Chloride 1 mg/L 1 mg/L OK Piezometer 1 Nitrogen 0.5 mg/L 0.1 mg/L D OK Piezometer 2 Chloride 1 mg/L 1 mg/L OK Piezometer 2 Nitrogen 0.1 mg/L 0.1 mg/L OK Piezometer 3 Chloride 1 mg/L 1 mg/L OK Piezometer 3 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-1 Chloride 1 mg/L 1 mg/L OK TWN-1 Nitrogen 0.1 mg/L 0.1 mg/L OK TWN-2 Chloride 1 mg/L 1 mg/L OK TWN-2 Nitrogen 5 mg/L 0.1 mg/L D OK TWN-3 Chloride 1 mg/L 1 mg/L OK TWN-3 Nitrogen 2 mg/L 0.1 mg/L D OK TWN-4 Chloride 1 mg/L 1 mg/L OK TWN-4 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-5 Chloride 1 mg/L 1 mg/L OK TWN-5 Nitrogen 0.1 mg/L 0.1 mg/L OK TWN-6 Chloride 1 mg/L 1 mg/L OK TWN-6 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-7 Chloride 1 mg/L 1 mg/L OK TWN-7 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-8 Chloride 1 mg/L 1 mg/L OK TWN-8 Nitrogen 0.1 mg/L 0.1 mg/L U OK TWN-9 Chloride 1 mg/L 1 mg/L OK TWN-9 Nitrogen 0.5 mg/L 0.1 mg/L D OK TWN-10 Chloride 1 mg/L 1 mg/L OK TWN-10 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-11 Chloride 1 mg/L 1 mg/L OK TWN-11 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-12 Chloride 1 mg/L 1 mg/L OK TWN-12 Nitrogen 0.1 mg/L 0.1 mg/L OK TWN-13 Chloride 1 mg/L 1 mg/L OK TWN-13 Nitrogen 0.1 mg/L 0.1 mg/L OK TWN-14 Chloride 1 mg/L 1 mg/L OK TWN-14 Nitrogen 0.5 mg/L 0.1 mg/L D OK TWN-15 Chloride 1 mg/L 1 mg/L OK TWN-15 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-16 Chloride 1 mg/L 1 mg/L OK TWN-16 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-17 Chloride 1 mg/L 1 mg/L OK TWN-17 Nitrogen 1 mg/L 0.1 mg/L D OK TWN-18 Chloride 1 mg/L 1 mg/L OK TWN-18 Nitrogen 0.2 mg/L 0.1 mg/L D OK TWN-19 Chloride 1 mg/L 1 mg/L OK TWN-19 Nitrogen 0.5 mg/L 0.1 mg/L D OK TWN-65 Chloride 1 mg/L 1 mg/L OK TWN-65 Nitrogen 0.1 mg/L 0.1 mg/L OK TWN-70 Chloride 1 mg/L 1 mg/L OK Lab Reporting Limit Rqd' Reporting Limit H-4: Reporting Limit Evaluation Location Constituent Qualifier Qualifier Check Lab Reporting Limit Rqd' Reporting Limit TWN-70 Nitrogen 5 mg/L 0.1 mg/L D OK UWLP Chloride 1 mg/L 1 mg/L U OK UWLP Nitrogen 0.1 mg/L 0.1 mg/L U OK H-5 QA/QC Evaluation for Sample Duplicates Constituent TWN-2 TWN-70 %RPD Chloride 97 92 5.29 Nitrogen 69 68 1.46 Constituent TWN-4 TWN-65 %RPD Chloride 22 22 0.00 Nitrogen 1 1 0.00 H-6 QC Control Limits for Analysis and Blanks The percent recovery was within the limits for all lab control samples, matrix spikes, and matrix spike duplicates. The RPD was below acceptable limits for each sample matrix spike duplicate from Energy Labs. The Method Blanks had no reported detections of target analytes. Sample Batch Wells in Batch Temperature C10060208 Peiz 1, Piez 2, Piez 3, TWN-2, TWN-2R, TWN-3, TWN-3R, TWN-6, TWN-6R, TWN-9, TWN-9R, TWN-10, TWN-10R, TWN-11, TWN-11R, TWN-14, TWN-14R, TWN-17, TWN- 17R, TWN-18, TWN-18R, TWN-19, TWN-19R, TWN-70, and UWLP 3 ˚C C10060090 TWN-1, TWN-1R, TWN-4, TWN-4R, TWN-5, TWN-5R, TWN- 7, TWN-7R, TWN-8, TWN-8R, TWN-12, TWN-12R, TWN-13, TWN-13R, TWN-15, TWN-15R, TWN-16, TWN-16R, and TWN-65 4 ˚C C10060490 TWN-60 3 ˚C H-7 Receipt Temperature Evaluation H-8 Rinsate Evaluation Rinsate Sample Parameter Qualifier Subsequent Well Sampled TWN-1R Nitrate+Nitrite as N 0.1 mg/L None TWN-1 0.6 mg/L TWN-4R Nitrate+Nitrite as N 0.1 mg/L None TWN-4 1.0 mg/L TWN-5R Nitrate+Nitrite as N 0.2 mg/L None TWN-5 0.3 mg/L TWN-6R Nitrate+Nitrite as N 0.1 mg/L None TWN-6 1.4 mg/L TWN-9R Nitrate+Nitrite as N 0.1 mg/L None TWN-9 7.7 mg/L TWN-12R Nitrate+Nitrite as N 0.1 mg/L None TWN-12 0.8 mg/L TWN-13R Nitrate+Nitrite as N 0.1 mg/L None TWN-13 0.1 mg/L TWN-16R Nitrate+Nitrite as N 0.1 mg/L None TWN-16 1.3 mg/L TWN-18R Nitrate+Nitrite as N 0.1 mg/L None TWN-18 1.8 mg/L TWN-19R Nitrate+Nitrite as N 0.1 mg/L None TWN-19 6.2 mg/L Rinsate Result Sample Result Tab I Kriged Current Quarter Isoconcentration Maps HYDRO GEO CHEM, INC.APPROVED DATE REFERENCE FIGURE 3332 3000 SCALE IN FEET 0 ND ND 0.3 ND ND ND ND 0.2 0.9 ND 2.6 8.4 3.1 0.2 0.1 ND 5.8 0.2 ND 16 23 6.8 6.7 3 7.6 7.1 2.5 1.5 1.6 6.9 11 5.2 2.9 1.1 4.7 ND 94.4 5.6 12 19 7.9 7.2 0.6 1.6 NS NS MW-01 MW-02 MW-03 MW-05 MW-11 MW-12 MW-14 MW-15 MW-17 MW-18 MW-19 MW-20 MW-22 MW-23 MW-24 MW-25 MW-27 MW-28 MW-29 MW-30 MW-31 MW-26 MW-32 PIEZ-1 PIEZ-2 PIEZ-3 PIEZ-4 PIEZ-5 3.9 5.1 NDMW-04 ND 30 16 TWN-1 TWN-2 TWN-3 TWN-4 TWN-5 TWN-6 TWN-7 TWN-8 TWN-9 TWN-10 TWN-11 TWN-12 TWN-13 TWN-14 TWN-15 TWN-16 TWN-17 TWN-18 TWN-19 0.6 69 26 1 0.3 1.4 1.2 0.1 7.7 1 1.3 0.8 0.1 2.9 1 1.3 11 1.8 6.2 MW-4 PIEZ-3 5.1 1.6 perched monitoring well showing concentration in mg/L perched piezometer showing concentration in mg/L 7.6 temporary perched monitoring well showing concentration in mg/L KRIGED 2nd QUARTER, 2010 NITROGEN (mg/L) (NITRATE + NITRITE AS N) WHITE MESA SITE H:/718000/ aug10/nitrate/nit0610.srf EXPLANATION NOTES: ND = not detected, NS = not sampled temporary perched monitoring well installed May, 2010 showing concentration in mg/L SJS temporary perched nitrate monitoring well showing concentration in mg/L0.6 TWN-1 7.9 HYDRO GEO CHEM, INC.APPROVED DATE REFERENCE FIGURE 3332 3000 SCALE IN FEET 0 18 7 63 52 32 64 17 35 35 52 28 57 59 7 46 31 42 108 35 97 128 40 43 24 35 28 33 33 42 40 29 52 49 58 64 32 35132 200 266 134 33 52 8 36 NS NS MW-01 MW-02 MW-03 MW-05 MW-11 MW-12 MW-14 MW-15 MW-17 MW-18 MW-19 MW-20 MW-22 MW-23 MW-24 MW-25 MW-27 MW-28 MW-29 MW-30 MW-31 MW-26 MW-32 PIEZ-1 PIEZ-2 PIEZ-3 PIEZ-4 PIEZ-5 31 41 42MW-04 40 639 306 TW4-24 TWN-1 TWN-2 TWN-3 TWN-4 TWN-5 TWN-6 TWN-7 TWN-8 TWN-9 TWN-10 TWN-11 TWN-12 TWN-13 TWN-14 TWN-15 TWN-16 TWN-17 TWN-18 TWN-19 20 97 118 22 44 22 6 11 175 30 72 106 49 30 39 35 87 63 113 MW-4 PIEZ-3 41 36 perched monitoring well showing concentration in mg/L perched piezometer showing concentration in mg/L 35 temporary perched monitoring well showing concentration in mg/L KRIGED 2nd QUARTER, 2010 CHLORIDE (mg/L) WHITE MESA SITE H:/718000/ may10/chloride/cl0610.srf EXPLANATION NOTES: ND = not detected, NS = not sampled temporary perched monitoring well installed May, 2010 showing concentration in mg/L33 SJS temporary perched nitratemonitoring well showing concentration in mg/L20 TWN-1 Tab J Analyte Concentrations Over Time TWN‐1 Date Nitrate (mg/l) Chloride (mg/l) 2/6/2009 0.7 19 7/21/2009 0.4 17 9/21/2009 0.4 19 10/28/2009 0.5 18 3/17/2010 0.5 17 5/26/2010 0.6 20 TWN‐2 Date Nitrate (mg/l) Chloride (mg/l) 2/6/2009 25.4 29 7/21/2009 25 25 9/21/2009 22.6 17 11/2/2009 20.8 55 3/24/2010 62.1 85 6/2/2010 69 97 TWN‐3 Date Nitrate (mg/l) Chloride (mg/l) 2/6/2009 23.6 96 7/21/2009 25.3 96 9/21/2009 27.1 99 11/2/2009 29 106 3/25/2010 25.3 111 6/3/2010 26 118 TWN‐4 Date Nitrate (mg/l) Chloride (mg/l) 2/6/2009 1 13 7/21/2009 0.05 12 9/21/2009 0.4 13 10/28/2009 0.4 11 3/16/2010 0.9 22 5/27/2010 1.0 22 TWN‐5 Date Nitrate (mg/l) Chloride (mg/l) 8/25/2009 0.22 42 9/21/2009 0.5 45 11/10/2009 0.2 48 3/16/2010 0.3 43 5/26/2010 0.3 44 TWN‐6 Date Nitrate (mg/l) Chloride (mg/l) 8/25/2009 3.2 32 9/22/2009 1.6 13 11/3/2009 1.4 21 3/23/2010 1.5 19 6/1/2010 1.4 22 TWN‐7 Date Nitrate (mg/l) Chloride (mg/l) 8/25/2009 ND 11 9/21/2009 ND 7 11/10/2009 0.1 7 3/17/2010 0.8 6 5/28/2010 1.2 6 TWN‐8 Date Nitrate (mg/l) Chloride (mg/l) Notes 8/25/2009 0 11 Nitrate is ND 9/21/2009 0 12 Nitrate is ND 11/10/2009 0 12 Nitrate is ND 3/16/2010 0 11 Nitrate is ND 5/26/2010 0 11 Nitrate is ND TWN‐9 Date Nitrate (mg/l) Chloride (mg/l) 8/25/2009 9.3 169 9/22/2009 8.9 201 11/10/2009 12 205 3/23/2010 7.6 183 6/1/2010 7.6 175 TWN‐10 Date Nitrate (mg/l) Chloride (mg/l) 8/25/2009 1.1 19 9/22/2009 1.6 35 11/10/2009 1.4 26 3/23/2010 1.5 54 6/4/2010 1 30 TWN‐11 Date Nitrate (mg/l) Chloride (mg/l) 11/3/2009 1.3 74 3/17/2010 1.4 73 6/4/2010 1.3 72 TWN‐12 Date Nitrate (mg/l) Chloride (mg/l) 11/3/2009 0.5 109 3/17/2010 0.7 113 5/26/2010 0.8 106 TWN‐13 Date Nitrate (mg/l) Chloride (mg/l) Notes 11/4/2009 0.5 83 3/17/2010 0 47 Nitrate ND 5/26/2010 0.1 49 TWN‐14 Date Nitrate (mg/l) Chloride (mg/l) 11/4/2009 3.4 32 3/24/2010 2.9 24 6/2/2010 2.9 30 TWN‐15 Date Nitrate (mg/l) Chloride (mg/l) 11/10/2009 1.1 78 3/18/2010 0.7 43 5/28/2010 1.0 39 TWN‐16 Date Nitrate (mg/l) Chloride (mg/l) 11/4/2009 1 39 3/17/2010 1.2 35 5/27/2010 0.2 35 TWN‐17 Date Nitrate (mg/l) Chloride (mg/l) 11/4/2009 6.7 152 3/24/2010 10.4 78 6/3/2010 11 87 TWN‐18 Date Nitrate (mg/l) Chloride (mg/l) 11/2/2009 1.3 57 3/17/2010 1.6 42 6/1/2010 1.8 63 TWN‐19 Date Nitrate (mg/l) Chloride (mg/l) 11/2/2009 7.4 125 3/23/2010 7.2 118 6/1/2010 6.2 113 Piezometer 1 Date Nitrate (mg/l) Chloride (mg/l) 2/19/2009 6.8 NA 7/14/2009 6.8 60 9/22/2009 7.3 78 10/27/2009 7.4 61 6/2/2010 7.2 52 Piezometer 2 Date Nitrate (mg/l) Chloride (mg/l) 2/19/2009 0.5 NA 7/14/2009 0.5 7 9/22/2009 0.5 17 10/27/2009 0.6 7 6/2/2010 0.6 8 Piezometer 3 Date Nitrate (mg/l) Chloride (mg/l) 2/19/2009 0.7 NA 7/14/2009 0.8 12 9/22/2009 0.8 24 10/27/2009 1.2 19 3/24/2010 1.7 116 6/2/2010 1.6 36 Piezometer 4 Date Nitrate (mg/l) Chloride (mg/l) 7/14/2009 1.8 46 Piezometer 5 Date Nitrate (mg/l) Chloride (mg/l) 7/14/2009 0.7 18 MW‐18 Date Nitrate (mg/l) Chloride (mg/l) 7/14/2009 ND 51 MW‐19 Date Nitrate (mg/l) Chloride (mg/l) 7/14/2009 2.2 24 Wildlife Pond Date Nitrate (mg/l) Chloride (mg/l) Note 9/22/2009 0 5 Nitrate ND 10/27/2009 0 3 Nitrate ND 6/2/2010 0 0 Nitrate and Chloride ND Frog Pond Date Nitrate (mg/l) Chloride (mg/l) Notes 10/14/09 0 0 Nitrate ND Tab K Concentration Trend Graphs 0.3 0.4 0.5 0.6 0.7 0.8 (m g / L ) TWN-1 Nitrate Concentrations 0 0.1 0.2 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 18 18.5 19 19.5 20 20.5 (m g / L ) TWN-1 Chloride Concentrations 16.5 17 17.5 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 30 40 50 60 70 80 (m g / L ) TWN-2 Nitrate Concentrations 0 10 20 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 60 80 100 120 (m g / L ) TWN-2 Chloride Concentrations 0 20 40 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 15 20 25 30 35 (m g / L ) TWN-3 Nitrate Concentrations 0 5 10 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 60 80 100 120 140 (m g / L ) TWN-3 Chloride Concentrations 0 20 40 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 0.6 0.8 1 1.2 (m g / L ) TWN-4 Nitrate Concentrations 0 0.2 0.4 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 10 15 20 25 (m g / L ) TWN-4 Chloride Concentrations 0 5 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 02 0.3 0.4 0.5 0.6 (m g / L ) TWN-5 Nitrate Concentrations 0 0.1 0.2 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 44 45 46 47 48 49 (m g / L ) TWN-5 Chloride Concentrations 41 42 43 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 1.5 2 2.5 3 3.5 (m g / L ) TWN-6 Nitrate Concentrations 0 0.5 1 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 15 20 25 30 35 (m g / L ) TWN-6 Chloride Concentrations 0 5 10 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.6 0.8 1 1.2 1.4 (m g / L ) TWN-7 Nitrate Concentrations 0 0.2 0.4 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 4 6 8 10 12 (m g / L ) TWN-7 Chloride Concentrations 0 2 4 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.4 0.5 0.6 0.7 0.8 0.9 1 (m g / L ) TWN-8 Nitrate Concentrations TWN-8 Nitrate Concentrations are all Non Detect 0 0.1 0.2 0.3 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 11.4 11.6 11.8 12 12.2 (m g / L ) TWN-8 Chloride Concentrations 10.8 11 11.2 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 6 8 10 12 14 (m g / L ) TWN-9 Nitrate Concentrations 0 2 4 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 100 150 200 250 (m g / L ) TWN-9 Chloride Concentrations 0 50 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.8 1 1.2 1.4 1.6 1.8 (m g / L ) TWN-10 Nitrate Concentrations 0 0.2 0.4 0.6 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 30 40 50 60 (m g / L ) TWN-10 Chloride Concentrations 0 10 20 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 1.34 1.36 1.38 1.4 1.42 (m g / L ) TWN-11 Nitrate Concentrations 1.28 1.3 1.32 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 73 73.5 74 74.5 (m g / L ) TWN-11 Chloride Concentrations 71.5 72 72.5 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.4 0.5 0.6 0.7 0.8 0.9 (m g / L ) TWN-12 Nitrate Concentrations 0 0.1 0.2 0.3 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 109 110 111 112 113 114 (m g / L ) TWN-12 Chloride Concentrations 105 106 107 108 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.3 0.4 0.5 0.6 (m g / L ) TWN-13 Nitrate Concentrations 0 0.1 0.2 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 40 50 60 70 80 90 (m g / L ) TWN-13 Chloride Concentrations 0 10 20 30 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 3.1 3.2 3.3 3.4 3.5 (m g / L ) TWN-14 Nitrate Concentrations 2.8 2.9 3 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 15 20 25 30 35 (m g / L ) TWN-14 Chloride Concentrations 0 5 10 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.6 0.8 1 1.2 (m g / L ) TWN-15 Nitrate Concentrations 0 0.2 0.4 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 40 50 60 70 80 90 (m g / L ) TWN-15 Chloride Concentrations 0 10 20 30 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.6 0.8 1 1.2 1.4 (m g / L ) TWN-16 Nitrate Concentrations 0 0.2 0.4 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 36.5 37 37.5 38 38.5 39 39.5 (m g / L ) TWN-16 Chloride Concentrations 34.5 35 35.5 36 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 6 8 10 12 (m g / L ) TWN-17 Nitrate Concentrations 0 2 4 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 60 80 100 120 140 160 (m g / L ) TWN-17 Chloride Concentrations 0 20 40 60 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.8 1 1.2 1.4 1.6 1.8 2 (m g / L ) TWN-18 Nitrate Concentrations 0 0.2 0.4 0.6 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 30 40 50 60 70 (m g / L ) TWN-18 Chloride Concentrations 0 10 20 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 6.6 6.8 7 7.2 7.4 7.6 (m g / L ) TWN-19 Nitrate Concentrations 6 6.2 6.4 6.6 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 118 120 122 124 126 (m g / L ) TWN-19 Chloride Concentrations 112 114 116 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 7 7.1 7.2 7.3 7.4 7.5 (m g / L ) Peizometer 1 Nitrate Concentrations 6.7 6.8 6.9 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 40 50 60 70 80 90 (m g / L ) Peizometer 1 Chloride Concentrations 0 10 20 30 Ma y - 0 9 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.54 0.56 0.58 0.6 0.62 (m g / L ) Peizometer 2 Nitrate Concentrations 0.48 0.5 0.52 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 8 10 12 14 16 18 (m g / L ) Peizometer 2 Chloride Concentrations 0 2 4 6 Ma y - 0 9 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.8 1 1.2 1.4 1.6 1.8 (m g / L ) Peizometer 3 Nitrate Concentrations 0 0.2 0.4 0.6 De c - 0 8 Ma r - 0 9 Ju l - 0 9 Oc t - 0 9 Ja n - 1 0 Ma y - 1 0 Au g - 1 0 60 80 100 120 140 (m g / L ) Peizometer 3 Chloride Concentrations 0 20 40 Ma y - 0 9 Ju l - 0 9 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.8 1 1.2 1.4 1.6 1.8 2 (m g / L ) Peizometer 4 Nitrate Concentrations 0 0.2 0.4 0.6 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 20 25 30 35 40 45 50 (m g / L ) Peizometer 4 Chloride Concentrations 0 5 10 15 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 0.3 0.4 0.5 0.6 0.7 0.8 (m g / L ) Peizometer 5 Nitrate Concentrations 0 0.1 0.2 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 8 10 12 14 16 18 20 (m g / L ) Peizometer 5 Chloride Concentrations 0 2 4 6 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 0.4 0.5 0.6 0.7 0.8 0.9 1 (m g / L ) MW-18 Nitrate Concentrations 0 0.1 0.2 0.3 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 30 40 50 60 (m g / L ) MW-18 Chloride Concentrations 0 10 20 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 1 1.5 2 2.5 (m g / L ) MW-19 Nitrate Concentrations 0 0.5 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 15 20 25 30 (m g / L ) MW-19 Chloride Concentrations 0 5 10 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 Ju l - 0 9 0.4 0.5 0.6 0.7 0.8 0.9 1 (m g / L ) Wildlife Pond Nitrate Concentrations 0 0.1 0.2 0.3 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 3 4 5 6 (m g / L ) Wildlife Pond Chloride Concentrations 0 1 2 Au g - 0 9 Oc t - 0 9 De c - 0 9 Ja n - 1 0 Ma r - 1 0 Ma y - 1 0 Ju n - 1 0 0.4 0.5 0.6 0.7 0.8 0.9 1 (m g / L ) Frog Pond Nitrate Concentrations 0 0.1 0.2 0.3 Ju l - 0 9 Ju l - 0 9 Au g - 0 9 Se p - 0 9 Se p - 0 9 Oc t - 0 9 No v - 0 9 0.4 0.5 0.6 0.7 0.8 0.9 1.0 (m g / L ) Frog Pond Chloride Concentrations 0.0 0.1 0.2 0.3 Ju l - 0 9 Ju l - 0 9 Au g - 0 9 Se p - 0 9 Se p - 0 9 Oc t - 0 9 No v - 0 9 Tab L CSV Transmittal Letter Kathy Weinel To: Cc: Subject: Attachments: Dear Mr.Lundberg, rlundberg@utah.gov Jo Ann Tischler;David Frydenlund;Harold Roberts Transmittal of CSV Files White Mesa Mill 2010 02 Nitrate Monitoring C10060090_csv.zip;C10060208_csv.zip;C10060490_R.csv Attached to this e-mail are electronic copies of laboratory results for nitrate monitoring conducted at the White Mesa Mill during the second quarter of 2010,in Comma Separated Value (CSV)format. Please contact me at 303-389-4134 if you have any questions on this transmittal. Yours Truly Kathy Weinel Denison Mines (USA)Corp. Quality Assurance Manager 1