Appendix J 2018 Old Camp Water Quality Results

Transcription

1 Appendix J 18 Old Camp Water Quality Results Street SW, Calgary, AB, Canada, T2P 1T1 T F

2 Dominion Diamond Ekati Corporation (DDEC) ATTN: David G. Bruce / Richard E. Ehlert # nd Street Yellowknife NT X1A 3T1 Date Received: 15-JUN-18 Report Date: 29-JUN-18 13:43 (MT) Version: FINAL Client Phone: Certificate of Analysis Lab Work Order #: L Project P.O. #: EKA 3002 PHASE 1 Job Reference: C of C Numbers: Legal Site Desc: Can Dang Senior Account Manager [This report shall not be reproduced except in full without the written authority of the Laboratory.] ADDRESS: 8081 Lougheed Hwy, Suite, Burnaby, BC V5A 1W9 Canada Phone: Fax: ALS CANADA LTD Part of the ALS Group An ALS Limited Company

3 ALS ENVIRONMENTAL ANALYTICAL REPORT L CONTD... PAGE 2 of 7 29-JUN-18 13:43 (MT) Version: FINAL Sample ID Description Sampled Date Sampled Time Client ID L L L L WATER WATER WATER WATER 13-JUN JUN JUN JUN-18 16:30 16:00 15:50 16:15 LARRY LAKE NORTH POND PHASE 1 TREH SOUTH POND Grouping WATER Physical Tests Anions and Nutrients Organic / Inorganic Carbon Total Metals Analyte Conductivity (us/cm) Hardness (as CaCO3) () ph (ph) Total Suspended Solids () Total Dissolved Solids () Turbidity (NTU) Alkalinity, Total (as CaCO3) () Ammonia, Total (as N) () Chloride (Cl) () Fluoride (F) () Nitrate and Nitrite (as N) () Nitrate (as N) () Nitrite (as N) () Total Kjeldahl Nitrogen () Orthophosphate-Dissolved (as P) () Phosphorus (P)-Total Dissolved () Phosphorus (P)-Total () Silicate (as SiO2) () Sulfate (SO4) () Total Carbon () Total Inorganic Carbon () Total Organic Carbon () Aluminum (Al)-Total () Antimony (Sb)-Total () Arsenic (As)-Total () Barium (Ba)-Total () Beryllium (Be)-Total () Boron (B)-Total () Cadmium (Cd)-Total () Calcium (Ca)-Total () Chromium (Cr)-Total () Cobalt (Co)-Total () Copper (Cu)-Total () Iron (Fe)-Total () Lead (Pb)-Total () Magnesium (Mg)-Total () < < < SFT < < < < < < < < < < < SFT * Please refer to the Reference Information section for an explanation of any qualifiers detected.

4 ALS ENVIRONMENTAL ANALYTICAL REPORT L CONTD... PAGE 3 of 7 29-JUN-18 13:43 (MT) Version: FINAL Sample ID Description Sampled Date Sampled Time Client ID L L L L WATER WATER WATER WATER 13-JUN JUN JUN JUN-18 16:30 16:00 15:50 16:15 LARRY LAKE NORTH POND PHASE 1 TREH SOUTH POND Grouping WATER Total Metals Dissolved Metals Analyte Manganese (Mn)-Total () Mercury (Hg)-Total () Molybdenum (Mo)-Total () Nickel (Ni)-Total () Potassium (K)-Total () Selenium (Se)-Total () Silicon (Si)-Total () Silver (Ag)-Total () Sodium (Na)-Total () Strontium (Sr)-Total () Uranium (U)-Total () Vanadium (V)-Total () Zinc (Zn)-Total () Dissolved Mercury Filtration Location Dissolved Metals Filtration Location Aluminum (Al)-Dissolved () Antimony (Sb)-Dissolved () Arsenic (As)-Dissolved () Barium (Ba)-Dissolved () Beryllium (Be)-Dissolved () Boron (B)-Dissolved () Cadmium (Cd)-Dissolved () Calcium (Ca)-Dissolved () Chromium (Cr)-Dissolved () Cobalt (Co)-Dissolved () Copper (Cu)-Dissolved () Iron (Fe)-Dissolved () Lead (Pb)-Dissolved () Magnesium (Mg)-Dissolved () Manganese (Mn)-Dissolved () Mercury (Hg)-Dissolved () Molybdenum (Mo)-Dissolved () Nickel (Ni)-Dissolved () Potassium (K)-Dissolved () Selenium (Se)-Dissolved () Silicon (Si)-Dissolved () Silver (Ag)-Dissolved () < < < < < < < < < < < < < LAB LAB LAB LAB LAB LAB LAB LAB < < < < < < < < < < < < < DLB DLB < < < < < < < < < < < < < < * Please refer to the Reference Information section for an explanation of any qualifiers detected.

5 ALS ENVIRONMENTAL ANALYTICAL REPORT L CONTD... PAGE 4 of 7 29-JUN-18 13:43 (MT) Version: FINAL Sample ID Description Sampled Date Sampled Time Client ID L L L L WATER WATER WATER WATER 13-JUN JUN JUN JUN-18 16:30 16:00 15:50 16:15 LARRY LAKE NORTH POND PHASE 1 TREH SOUTH POND Grouping WATER Dissolved Metals Volatile Organic Compounds Hydrocarbons Analyte Sodium (Na)-Dissolved () Strontium (Sr)-Dissolved () Uranium (U)-Dissolved () Vanadium (V)-Dissolved () Zinc (Zn)-Dissolved () Benzene () Ethylbenzene () Styrene () Toluene () ortho-xylene () meta- & para-xylene () Xylenes () Surrogate: 4-Bromofluorobenzene (SS) (%) Surrogate: 1,4-Difluorobenzene (SS) (%) TVH (C5-C10) () TEH10-30 () TPH5-30 () Surrogate: 2-Bromobenzotrifluoride (%) < < < < < < < < < < < < < < < < < < < < < < < < < < < < < <0.10 <0.10 <0.10 <0.10 < <0.10 <0.10 <0.25 <0.25 <0.25 < * Please refer to the Reference Information section for an explanation of any qualifiers detected.

6 L CONTD... PAGE 5 of 7 29-JUN-18 13:43 (MT) Reference Information Version: FINAL QC Samples with Qualifiers & Comments: QC Type Description Parameter Qualifier Applies to Sample Number(s) Method Blank Manganese (Mn)-Total B L , -2, -3, -4 Method Blank Chromium (Cr)-Dissolved MB-LOR L , -2, -3, -4 Method Blank Sodium (Na)-Dissolved MB-LOR L , -2, -3, -4 Matrix Spike Total Inorganic Carbon MS-B L , -2, -3, -4 Matrix Spike Total Organic Carbon MS-B L , -2, -3, -4 Matrix Spike Barium (Ba)-Dissolved MS-B L , -2, -3, -4 Matrix Spike Calcium (Ca)-Dissolved MS-B L , -2, -3, -4 Matrix Spike Magnesium (Mg)-Dissolved MS-B L , -2, -3, -4 Matrix Spike Strontium (Sr)-Dissolved MS-B L , -2, -3, -4 Matrix Spike Aluminum (Al)-Total MS-B L , -2, -3, -4 Matrix Spike Barium (Ba)-Total MS-B L , -2, -3, -4 Matrix Spike Calcium (Ca)-Total MS-B L , -2, -3, -4 Matrix Spike Iron (Fe)-Total MS-B L , -2, -3, -4 Matrix Spike Magnesium (Mg)-Total MS-B L , -2, -3, -4 Matrix Spike Manganese (Mn)-Total MS-B L , -2, -3, -4 Matrix Spike Strontium (Sr)-Total MS-B L , -2, -3, -4 Qualifiers for Individual Parameters Listed: Qualifier Description B DLB MB-LOR MS-B SFT Method Blank exceeds ALS DQO. Associated sample results which are < Limit of Reporting or > 5 times blank level are considered reliable. Detection Limit Raised. Analyte detected at comparable level in Method Blank. Method Blank exceeds ALS DQO. Limits of Reporting have been adjusted for samples with positive hits below 5x blank level. Matrix Spike recovery could not be accurately calculated due to high analyte background in sample. Sample was filtered due to turbidity interference. Result reflects soluble analyte concentration. Test Method References: ALS Test Code Matrix Test Description Method Reference** ALK-TITR-VA ANIONS-N+N-CALC-VA CARBONS-TC-CALC-VA CARBONS-TIC-VA CARBONS-TOC-VA Water Alkalinity Species by Titration This analysis is carried out using procedures adapted from APHA Method 23 "Alkalinity". Total alkalinity is determined by potentiometric titration to a ph 4.5 endpoint. Bicarbonate, carbonate and hydroxide alkalinity are calculated from phenolphthalein alkalinity and total alkalinity values. Water Nitrite & Nitrate in Water (Calculation) Nitrate and Nitrite (as N) is a calculated parameter. Nitrate and Nitrite (as N) = Nitrite (as N) + Nitrate (as N). Water Tot. Carbon in Water by Calc. (TOC+TIC) Total carbon is calculated by additional of Total Organic Carbon and Total Inorganic Carbon concentrations. Water Total inorganic carbon by CO2 purge This analysis is carried out using procedures adapted from APHA Method 5310 "Total Organic Carbon (TOC)". Water Total organic carbon by combustion APHA 23 Alkalinity EPA APHA 5310B This analysis is carried out using procedures adapted from APHA Method 5310 "Total Organic Carbon (TOC)". APHA 5310B TOTAL ORGANIC CARBON (TOC) APHA 5310B TOTAL ORGANIC CARBON (TOC) CL-IC-N-VA Water Chloride in Water by IC Inorganic anions are analyzed by Ion Chromatography with conductivity and/or UV detection. EPA (mod) EC-PCT-VA EC-SCREEN-VA EPH-L-ME-FID-VA Water Conductivity (Automated) This analysis is carried out using procedures adapted from APHA Method 2510 "Conductivity". Conductivity is determined using a conductivity electrode. Water Conductivity Screen (Internal Use Only) Qualitative analysis of conductivity where required during preparation of other tests - e.g. TDS, metals, etc. Water EPH in Water (Low Level) APHA 2510 Auto. Conduc. APHA 2510 BC Lab Manual EPH is extracted from water using a hexane micro-extraction technique, with analysis by GC-FID, as per the BC Lab Manual. EPH results include PAHs and are therefore not equivalent to LEPH or HEPH.

7 Reference Information L CONTD... PAGE 6 of 7 29-JUN-18 13:43 (MT) Version: FINAL F-IC-N-VA Water Fluoride in Water by IC Inorganic anions are analyzed by Ion Chromatography with conductivity and/or UV detection. EPA (mod) HARDNESS-CALC-VA HG-D-CVAA-VA HG-T-CVAA-VA Water Hardness Hardness (also known as Total Hardness) is calculated from the sum of Calcium and Magnesium concentrations, expressed in CaCO3 equivalents. Dissolved Calcium and Magnesium concentrations are preferentially used for the hardness calculation. Water Diss. Mercury in Water by CVAAS or CVAFS Water samples are filtered (0.45 um), preserved with hydrochloric acid, then undergo a cold-oxidation using bromine monochloride prior to reduction with stannous chloride, and analyzed by CVAAS or CVAFS. Water Total Mercury in Water by CVAAS or CVAFS APHA 2340B APHA 3030B/EPA 1631E (mod) EPA 1631E (mod) Water samples undergo a cold-oxidation using bromine monochloride prior to reduction with stannous chloride, and analyzed by CVAAS or CVAFS. MET-D-CCMS-VA Water Dissolved Metals in Water by CRC ICPMS Water samples are filtered (0.45 um), preserved with nitric acid, and analyzed by CRC ICPMS. APHA 3030B/60A (mod) Method Limitation (re: Sulfur): Sulfide and volatile sulfur species may not be recovered by this method. MET-T-CCMS-VA Water Total Metals in Water by CRC ICPMS Water samples are digested with nitric and hydrochloric acids, and analyzed by CRC ICPMS. EPA 0.2/60A (mod) Method Limitation (re: Sulfur): Sulfide and volatile sulfur species may not be recovered by this method. NH3-F-VA NO2-L-IC-N-VA Water Ammonia in Water by Fluorescence This analysis is carried out, on sulfuric acid preserved samples, using procedures modified from J. Environ. Monit., 05, 7, 37-42, The Royal Society of Chemistry, "Flow-injection analysis with fluorescence detection for the determination of trace levels of ammonium in seawater", Roslyn J. Waston et al. Water Nitrite in Water by IC (Low Level) Inorganic anions are analyzed by Ion Chromatography with conductivity and/or UV detection. J. ENVIRON. MONIT., 05, 7, 37-42, RSC EPA (mod) NO3-L-IC-N-VA Water Nitrate in Water by IC (Low Level) Inorganic anions are analyzed by Ion Chromatography with conductivity and/or UV detection. EPA (mod) P-T-PRES-COL-VA P-TD-COL-VA PH-PCT-VA PO4-DO-COL-VA SILICATE-COL-VA Water Total P in Water by Colour This analysis is carried out using procedures adapted from APHA Method 4500-P "Phosphorus". Total Phosphorus is determined colourimetrically after persulphate digestion of the sample. Samples with very high dissolved solids (i.e. seawaters, brackish waters) may produce a negative bias by this method. Alternate methods are available for these types of samples. Arsenic (5+), at elevated levels, is a positive interference on colourimetric phosphate analysis. Water Total Dissolved P in Water by Colour This analysis is carried out using procedures adapted from APHA Method 4500-P "Phosphorus". Total Dissolved Phosphorus is determined colourimetrically after persulphate digestion of a sample that has been lab or field filtered through a 0.45 micron membrane filter. Samples with very high dissolved solids (i.e. seawaters, brackish waters) may produce a negative bias by this method. Alternate methods are available for these types of samples. Arsenic (5+), at elevated levels, is a positive interference on colourimetric phosphate analysis. Water ph by Meter (Automated) This analysis is carried out using procedures adapted from APHA Method 4500-H "ph Value". The ph is determined in the laboratory using a ph electrode It is recommended that this analysis be conducted in the field. Water Diss. Orthophosphate in Water by Colour This analysis is carried out using procedures adapted from APHA Method 4500-P "Phosphorus". Dissolved Orthophosphate is determined colourimetrically on a sample that has been lab or field filtered through a 0.45 micron membrane filter. Samples with very high dissolved solids (i.e. seawaters, brackish waters) may produce a negative bias by this method. Alternate methods are available for these types of samples. Arsenic (5+), at elevated levels, is a positive interference on colourimetric phosphate analysis. Water Silicate by Colourimetric analysis APHA 4500-P Phosphorus APHA 4500-P Phosphorous APHA 4500-H ph Value APHA 4500-P Phosphorus APHA 4500-SiO2 E. This analysis is carried out using procedures adapted from APHA Method 4500-SiO2 E. "Silica". Silicate (molybdate-reactive silica) is determined by the molybdosilicate-heteropoly blue colourimetric method.

8 Reference Information L CONTD... PAGE 7 of 7 29-JUN-18 13:43 (MT) Version: FINAL SO4-IC-N-VA Water Sulfate in Water by IC Inorganic anions are analyzed by Ion Chromatography with conductivity and/or UV detection. EPA (mod) TDS-VA TKN-F-VA TPH-5-30-CALC-VA TSS-VA TURBIDITY-VA TVH-HSFID-VA VOC7-HSMS-VA VOC7/VOC-SURR-MS-VA XYLENES-CALC-VA Total Dissolved Solids by Gravimetric This analysis is carried out using procedures adapted from APHA Method 2540 "Solids". Solids are determined gravimetrically. Total Dissolved Solids (TDS) are determined by filtering a sample through a glass fibre filter, TDS is determined by evaporating the filtrate to dryness at 180 degrees celsius. TKN in Water by Fluorescence This analysis is carried out using procedures adapted from APHA Method 4500-Norg D. "Block Digestion and Flow Injection Analysis". Total Kjeldahl Nitrogen is determined using block digestion followed by Flow-injection analysis with fluorescence detection. Calculation of TPH 5-30 "TPH5-30 is the sum of TVH(C5-C10) and TEH(10-30) analyses. Neither test involves silica gel treatment. Refer to those methodologies for details of analysis." Total Suspended Solids by Gravimetric This analysis is carried out using procedures adapted from APHA Method 2540 "Solids". Solids are determined gravimetrically. Total Suspended Solids (TSS) are determined by filtering a sample through a glass fibre filter, TSS is determined by drying the filter at 104 degrees celsius. Samples containing very high dissolved solid content (i.e. seawaters, brackish waters) may produce a positive bias by this method. Alternate analysis methods are available for these types of samples. Turbidity by Meter This analysis is carried out using procedures adapted from APHA Method 2130 "Turbidity". Turbidity is determined by the nephelometric method. TVH by headspace GCFID This procedure involves the headspace extraction of the sample prior to analysis for Volatile Hydrocarbons (VH) by capillary column gas chromatography with flame-ionization detection (GC/FID). The VH analysis is carried out in accordance with the British Columbia Ministry of Environment, Lands and Parks (BCMELP) Analytical Method for Contaminated Sites "Volatile Hydrocarbons in Water by GC/FID" (Version 2.1, July 1999). BTEX/MTBE/Styrene by Headspace GCMS The water sample, with added reagents, is heated in a sealed vial to equilibrium. The headspace from the vial is transfered into a gas chromatograph. Target compound concentrations are measured using mass spectrometry detection. Calculation of Total Xylenes Water Water Water Water Water Water Water Water Water VOC7 and/or VOC Surrogates for Waters Sum of Xylene Isomer Concentrations APHA 2540 C - GRAVIMETRIC APHA 4500-NORG D. Calculation APHA 2540 D - GRAVIMETRIC APHA 2130 Turbidity EPA 8260B, BCMELP CSR METHOD EPA 5021A/8260C EPA 5035A/5021A/8260C CALCULATION Total Xylenes is the sum of the concentrations of the ortho, meta, and para Xylene isomers. Results below detection limit (DL) are treated as zero. The DL for Total Xylenes is set to a value no less than the square root of the sum of the squares of the DLs of the individual Xylenes. ** ALS test methods may incorporate modifications from specified reference methods to improve performance. The last two letters of the above test code(s) indicate the laboratory that performed analytical analysis for that test. Refer to the list below: Laboratory Definition Code VA Laboratory Location ALS ENVIRONMENTAL - VAOUVER, BRITISH COLUMBIA, CANADA Chain of Custody Numbers: GLOSSARY OF REPORT TERMS Surrogate - A compound that is similar in behaviour to target analyte(s), but that does not occur naturally in environmental samples. For applicable tests, surrogates are added to samples prior to analysis as a check on recovery. mg/kg - milligrams per kilogram based on dry weight of sample. mg/kg wwt - milligrams per kilogram based on wet weight of sample. mg/kg lwt - milligrams per kilogram based on lipid-adjusted weight of sample. - milligrams per litre. < - Less than. D.L. - The reported Detection Limit, also known as the Limit of Reporting (LOR). - Result not available. Refer to qualifier code and definition for explanation. Test results reported relate only to the samples as received by the laboratory. UNLESS OTHERWISE STATED, ALL SAMPLES WERE RECEIVED IN ACCEPTABLE CONDITION. Analytical results in unsigned test reports with the DRAFT watermark are subject to change, pending final QC review.

9 ALS Sample ID: Client Sample ID: 500 L L-1 LARRY LAKE Response - MilliVolts Time - Minutes The BC EPH Hydrocarbon Distribution Report (HDR) is intended to assist you in characterizing hydrocarbon products that may be present in your sample. The scale at the bottom of the chromatogram indicates the approximate retention times of common petroleum products and three n-alkane hydrocarbon marker compounds. Retention times may vary between samples, but general patterns and distributions will remain similar. Peak heights in this report are a function of the sample concentration, the sample amount extracted, the sample dilution factor, and the scale at left. A "-L-" in the sample ID denotes a low level sample. A "-S-" denotes a silica gel cleaned sample. Note: This chromatogram was produced using GC conditions that are specific to the ALS Canada EPH method. Refer to the ALS Canada EPH Hydrocarbon Library for a collection of chromatograms from common reference samples (fuels, oils, etc.). The HDR library can be found at Printed on 6/26/18 11:44:02 AM Page

10 ALS Sample ID: Client Sample ID: 500 L L-2 NORTH POND Response - MilliVolts Time - Minutes The BC EPH Hydrocarbon Distribution Report (HDR) is intended to assist you in characterizing hydrocarbon products that may be present in your sample. The scale at the bottom of the chromatogram indicates the approximate retention times of common petroleum products and three n-alkane hydrocarbon marker compounds. Retention times may vary between samples, but general patterns and distributions will remain similar. Peak heights in this report are a function of the sample concentration, the sample amount extracted, the sample dilution factor, and the scale at left. A "-L-" in the sample ID denotes a low level sample. A "-S-" denotes a silica gel cleaned sample. Note: This chromatogram was produced using GC conditions that are specific to the ALS Canada EPH method. Refer to the ALS Canada EPH Hydrocarbon Library for a collection of chromatograms from common reference samples (fuels, oils, etc.). The HDR library can be found at Printed on 6/26/18 11:44:06 AM Page

11 ALS Sample ID: Client Sample ID: 500 L L-3 PHASE 1 TREH Response - MilliVolts Time - Minutes The BC EPH Hydrocarbon Distribution Report (HDR) is intended to assist you in characterizing hydrocarbon products that may be present in your sample. The scale at the bottom of the chromatogram indicates the approximate retention times of common petroleum products and three n-alkane hydrocarbon marker compounds. Retention times may vary between samples, but general patterns and distributions will remain similar. Peak heights in this report are a function of the sample concentration, the sample amount extracted, the sample dilution factor, and the scale at left. A "-L-" in the sample ID denotes a low level sample. A "-S-" denotes a silica gel cleaned sample. Note: This chromatogram was produced using GC conditions that are specific to the ALS Canada EPH method. Refer to the ALS Canada EPH Hydrocarbon Library for a collection of chromatograms from common reference samples (fuels, oils, etc.). The HDR library can be found at Printed on 6/26/18 11:44:10 AM Page

12 ALS Sample ID: Client Sample ID: 500 L L-4 SOUTH POND Response - MilliVolts Time - Minutes The BC EPH Hydrocarbon Distribution Report (HDR) is intended to assist you in characterizing hydrocarbon products that may be present in your sample. The scale at the bottom of the chromatogram indicates the approximate retention times of common petroleum products and three n-alkane hydrocarbon marker compounds. Retention times may vary between samples, but general patterns and distributions will remain similar. Peak heights in this report are a function of the sample concentration, the sample amount extracted, the sample dilution factor, and the scale at left. A "-L-" in the sample ID denotes a low level sample. A "-S-" denotes a silica gel cleaned sample. Note: This chromatogram was produced using GC conditions that are specific to the ALS Canada EPH method. Refer to the ALS Canada EPH Hydrocarbon Library for a collection of chromatograms from common reference samples (fuels, oils, etc.). The HDR library can be found at Printed on 6/26/18 11:44:14 AM Page

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14 Your Project #: Your C.O.C. #: Attention: Reid Smith STANTEC CONSULTING LTD 40 HIGHFIELD PARK DRIVE SUITE 102 DARTMOUTH, NS CANADA B3A 0A3 Report Date: 18/09/19 Report #: R Version: 1 - Final MAXXAM JOB #: B Received: 18/09/12, 16:15 Sample Matrix: Water # Samples Received: 8 Analyses (pp, total), CO3,HCO3,OH BTEX/F1 in Water by HS GC/MS/FID F1-BTEX Chloride by Automated Colourimetry Chloride by Automated Colourimetry CCME Hydrocarbons (F2-F4 in water) (1) Hardness Hardness Elements by ICP - Dissolved (2) Elements by ICP-Dissolved-Lab Filtered (2) Elements by ICP - Total Elements by ICPMS - Dissolved (2) Elements by ICPMS - Dissolved (2) Elements by ICPMS-Dissolved-Lab Filtered (3) Elements by ICPMS - Total Ion Balance Sum of cations, anions Sum of cations, anions Nitrate and Nitrite Nitrate (as N) NO2 - NO2 + NO3 (N) by CFA C (4) Sulphate by Automated Colourimetry Sulphate by Automated Colourimetry Total Hydrocarbons C6-C50 in Water (5) Total Dissolved Solids (Calculated) CERTIFICATE OF ANALYSIS Date Quantity Extracted Date Analyzed Laboratory Method 18/09/14 AB SOP /09/14 AB SOP /09/15 AB SOP /09/14 AB SOP /09/15 AB SOP /09/14 AB SOP /09/14 18/09/15 AB SOP / AB SOP /09/14 AB WI /09/15 AB WI /09/14 AB SOP /09/14 AB SOP /09/14 18/09/14 AB SOP / AB SOP /09/14 AB SOP /09/18 AB SOP /09/17 AB SOP /09/14 18/09/14 AB SOP / AB SOP /09/14 AB WI /09/14 AB WI /09/15 AB WI /09/16 AB WI /09/13 18/09/16 AB WI /09/16 AB SOP /09/14 AB SOP /09/14 AB SOP /09/15 AB SOP /09/19 AB SOP /09/17 AB WI Analytical Method SM B m CCME CWS/EPA 8260d m Auto Calc SM Cl-E m SM Cl-E m SM B m CCME PHC-CWS m Auto Calc Auto Calc EPA 6010d R4 m EPA 6010d R4 m EPA 6010d R4 m EPA 60b R2 m EPA 60b R2 m EPA 60b R2 m EPA 60b R2 m Auto Calc Auto Calc Auto Calc Auto Calc Auto Calc IM m SM H+ B m SM SO4 E m SM SO4 E m Auto Calc Auto Calc Page 1 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

15 Your Project #: Your C.O.C. #: Attention: Reid Smith STANTEC CONSULTING LTD 40 HIGHFIELD PARK DRIVE SUITE 102 DARTMOUTH, NS CANADA B3A 0A3 Report Date: 18/09/19 Report #: R Version: 1 - Final MAXXAM JOB #: B Received: 18/09/12, 16:15 Remarks: CERTIFICATE OF ANALYSIS Maxxam Analytics' laboratories are accredited to ISO/IEC 17025:05 for specific parameters on scopes of accreditation. Unless otherwise noted, procedures used by Maxxam are based upon recognized Provincial, Federal or US method compendia such as CCME, MDDELCC, EPA, APHA. All work recorded herein has been done in accordance with procedures and practices ordinarily exercised by professionals in Maxxam s profession using accepted testing methodologies, quality assurance and quality control procedures (except where otherwise agreed by the client and Maxxam in writing). All data is in statistical control and has met quality control and method performance criteria unless otherwise noted. All method blanks are reported; unless indicated otherwise, associated sample data are not blank corrected. Where applicable, unless otherwise noted, Measurement Uncertainty has not been accounted for when stating conformity to the referenced standard. Maxxam Analytics' liability is limited to the actual cost of the requested analyses, unless otherwise agreed in writing. There is no other warranty expressed or implied. Maxxam has been retained to provide analysis of samples provided by the Client using the testing methodology referenced in this report. Interpretation and use of test results are the sole responsibility of the Client and are not within the scope of services provided by Maxxam, unless otherwise agreed in writing. Maxxam is not responsible for the accuracy or any data impacts, that result from the information provided by the customer or their agent. Solid sample results, except biota, are based on dry weight unless otherwise indicated. Organic analyses are not recovery corrected except for isotope dilution methods. Results relate to samples tested. When sampling is not conducted by Maxxam, results relate to the supplied samples tested. This Certificate shall not be reproduced except in full, without the written approval of the laboratory. Reference Method suffix m indicates test methods incorporate validated modifications from specific reference methods to improve performance. * RPDs calculated using raw data. The rounding of final results may result in the apparent difference. (1) Silica gel clean up employed. (2) Dissolved > Total Imbalance: When applicable, Dissolved and Total results were reviewed and data quality meets acceptable levels unless otherwise noted. (3) Samples were filtered and preserved at the lab. Values may not reflect concentrations at the time of sampling. Dissolved > Total Imbalance: When applicable, Dissolved and Total results were reviewed and data quality meets acceptable levels unless otherwise noted. (4) The CCME method requires ph to be analysed within 15 minutes of sampling and therefore field analysis is required for compliance. All Laboratory ph analyses in this report are reported past the CCME holding time. Maxxam endeavours to analyze samples as soon as possible after receipt. (5) Total Hydrocarbons C6-C50 calculated as a sum of CCME PHC fractions 1-4. Encryption Key Please direct all questions regarding this Certificate of Analysis to your Project Manager. Geraldlyn Gouthro, Client Service Specialist GGouthro@maxxam.ca Phone# (403) ==================================================================== This report has been generated and distributed using a secure automated process. Page 2 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

16 Your Project #: Your C.O.C. #: Attention: Reid Smith STANTEC CONSULTING LTD 40 HIGHFIELD PARK DRIVE SUITE 102 DARTMOUTH, NS CANADA B3A 0A3 Report Date: 18/09/19 Report #: R Version: 1 - Final CERTIFICATE OF ANALYSIS MAXXAM JOB #: B Received: This report has 18/09/12, been generated 16:15and distributed using a secure automated process. Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section of ISO/IEC 17025:05(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page. Total Cover Pages : 3 Page 3 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

17 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW AT1 BTEX AND F1-F4 IN WATER (WATER) Maxxam ID UH3068 UH3069 UH3074 Sampling Date 18/09/10 18/09/10 18/09/10 COC Number UNITS LARRY LAKE NORTH LARRY LAKE SOUTH DUP 1 RDL QC Batch Ext. Pet. Hydrocarbon F2 (C10-C16 Hydrocarbons) F3 (C16-C34 Hydrocarbons) F4 (C34-C50 Hydrocarbons) Volatiles <0.10 <0.10 <0. <0.10 <0.10 <0. <0.10 <0.10 < Benzene Toluene Ethylbenzene m & p-xylene o-xylene Xylenes (Total) F1 (C6-C10) - BTEX F1 (C6-C10) Surrogate Recovery (%) ug/l ug/l ug/l ug/l ug/l ug/l ug/l ug/l 1.9 <0.40 <0.40 <0.80 <0.40 <0.89 < < 0.68 <0.40 <0.40 <0.80 <0.40 <0.89 < < 0.74 <0.40 <0.40 <0.80 <0.40 <0.89 < < ,4-Difluorobenzene (sur.) 4-Bromofluorobenzene (sur.) D4-1,2-Dichloroethane (sur.) O-TERPHENYL (sur.) % % % % RDL = Reportable Detection Limit = Not Applicable Page 4 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

18 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID UH3067 UH3067 UH3068 Sampling Date 18/09/09 18/09/09 18/09/10 COC Number UNITS PHASE 1 TREH PHASE 1 TREH Lab-Dup QC Batch LARRY LAKE NORTH RDL QC Batch Calculated Parameters Anion Sum Cation Sum Hardness (CaCO3) Ion Balance (% Difference) Dissolved Nitrate (N) Dissolved Nitrate (NO3) Dissolved Nitrite (NO2) Calculated Total Dissolved Solids Misc. Inorganics meq/l meq/l % < <0.0 <0.089 < Conductivity ph Anions us/cm ph Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) Hydroxide (OH) Dissolved Sulphate (SO4) Dissolved Chloride (Cl) Nutrients Dissolved Nitrite (N) Dissolved Nitrate plus Nitrite (N) Elements < < <0.010 < Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Barium (Ba) Dissolved Beryllium (Be) Dissolved Boron (B) Dissolved Cadmium (Cd) 0. < <0.0 < < <0.0 < < <0.010 <0.0 < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate = Not Applicable Page 5 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

19 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID UH3067 UH3067 UH3068 Sampling Date 18/09/09 18/09/09 18/09/10 COC Number UNITS PHASE 1 TREH PHASE 1 TREH Lab-Dup QC Batch LARRY LAKE NORTH RDL QC Batch Dissolved Calcium (Ca) Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Iron (Fe) Dissolved Lead (Pb) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Selenium (Se) Dissolved Silicon (Si) Dissolved Silver (Ag) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) < < < < < < < < < < < < < <0.060 <0.000 < < < < < < <0.000 < < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate Page 6 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

20 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID UH3070 UH3070 UH3071 UH3071 Sampling Date 18/09/10 18/09/10 18/09/10 18/09/10 COC Number UNITS NORTH POND NORTH POND Lab-Dup QC Batch SOUTH POND SOUTH POND Lab-Dup RDL QC Batch Calculated Parameters Anion Sum Cation Sum Hardness (CaCO3) Ion Balance (% Difference) Dissolved Nitrate (N) Dissolved Nitrate (NO3) Dissolved Nitrite (NO2) Calculated Total Dissolved Solids Misc. Inorganics meq/l meq/l % < < Conductivity ph Anions us/cm ph Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) Hydroxide (OH) Dissolved Sulphate (SO4) Dissolved Chloride (Cl) Nutrients Dissolved Nitrite (N) Dissolved Nitrate plus Nitrite (N) Elements < < Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Barium (Ba) Dissolved Beryllium (Be) Dissolved Boron (B) Dissolved Cadmium (Cd) < <0.0 < < < < <0.0 < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate = Not Applicable Page 7 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

21 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID UH3070 UH3070 UH3071 UH3071 Sampling Date 18/09/10 18/09/10 18/09/10 18/09/10 COC Number UNITS NORTH POND NORTH POND Lab-Dup QC Batch SOUTH POND SOUTH POND Lab-Dup RDL QC Batch Dissolved Calcium (Ca) Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Iron (Fe) Dissolved Lead (Pb) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Selenium (Se) Dissolved Silicon (Si) Dissolved Silver (Ag) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) < < < < < <0.000 < < < <0.000 < < < < < < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate = Not Applicable Page 8 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

22 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID Sampling Date COC Number UH /09/10 UH /09/10 UH /09/10 UNITS CHANNEL 1 QC Batch CHANNEL 2 QC Batch DUP 1 RDL QC Batch Calculated Parameters Anion Sum Cation Sum Hardness (CaCO3) Ion Balance (% Difference) Dissolved Nitrate (N) Dissolved Nitrate (NO3) Dissolved Nitrite (NO2) Calculated Total Dissolved Solids Misc. Inorganics Conductivity ph Anions Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) Hydroxide (OH) Dissolved Sulphate (SO4) Dissolved Chloride (Cl) Nutrients Dissolved Nitrite (N) Dissolved Nitrate plus Nitrite (N) Elements Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Barium (Ba) Dissolved Beryllium (Be) Dissolved Boron (B) Dissolved Cadmium (Cd) Dissolved Calcium (Ca) meq/l meq/l % us/cm ph < < < <0.0 < < < < <0.0 < <0.0 <0.089 < <0.010 < < <0.010 <0.0 < RDL = Reportable Detection Limit = Not Applicable Page 9 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

23 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE WATER & DISS. REGULATED METALS (WATER) Maxxam ID Sampling Date COC Number UH /09/10 UH /09/10 UH /09/10 UNITS CHANNEL 1 QC Batch CHANNEL 2 QC Batch DUP 1 RDL QC Batch Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Iron (Fe) Dissolved Lead (Pb) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Selenium (Se) Dissolved Silicon (Si) Dissolved Silver (Ag) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) < < < < < < < < < < < <0.060 <0.000 < < < < < < <0.000 < < RDL = Reportable Detection Limit Page 10 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

24 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE + DISS. REG. METALS LAB FILT (WATER) Maxxam ID UH3069 UH3069 Sampling Date 18/09/10 18/09/10 COC Number UNITS LARRY LAKE SOUTH LARRY LAKE SOUTH Lab-Dup RDL QC Batch Calculated Parameters Anion Sum Cation Sum Hardness (CaCO3) Ion Balance (% Difference) Dissolved Nitrate (N) Dissolved Nitrate (NO3) Dissolved Nitrite (NO2) Calculated Total Dissolved Solids Misc. Inorganics meq/l meq/l % <0.0 <0.089 < Conductivity ph Anions us/cm ph Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) Hydroxide (OH) Dissolved Sulphate (SO4) Dissolved Chloride (Cl) Nutrients Dissolved Nitrite (N) Dissolved Nitrate plus Nitrite (N) Lab Filtered Elements <0.010 < Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Barium (Ba) Dissolved Beryllium (Be) Dissolved Boron (B) Dissolved Cadmium (Cd) Dissolved Calcium (Ca) < <0.010 <0.0 < < < < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate = Not Applicable Page 11 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

25 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW ROUTINE + DISS. REG. METALS LAB FILT (WATER) Maxxam ID UH3069 UH3069 Sampling Date 18/09/10 18/09/10 COC Number UNITS LARRY LAKE SOUTH LARRY LAKE SOUTH Lab-Dup RDL QC Batch Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Iron (Fe) Dissolved Lead (Pb) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Selenium (Se) Dissolved Silicon (Si) Dissolved Silver (Ag) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) < <0.060 <0.000 < < < < <0.000 <0.10 < <0.000 < < < <0.000 < <0.000 < <0.000 < < RDL = Reportable Detection Limit Lab-Dup = Laboratory Initiated Duplicate = Not Applicable Page 12 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

26 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW REGULATED METALS (CCME/AT1) - TOTAL Maxxam ID UH3067 UH3068 UH3069 UH3070 UH3071 Sampling Date 18/09/09 18/09/10 18/09/10 18/09/10 18/09/10 COC Number UNITS PHASE 1 TREH LARRY LAKE NORTH LARRY LAKE SOUTH NORTH POND SOUTH POND RDL QC Batch Elements Total Aluminum (Al) Total Antimony (Sb) Total Arsenic (As) Total Barium (Ba) Total Beryllium (Be) Total Boron (B) Total Cadmium (Cd) Total Calcium (Ca) Total Chromium (Cr) Total Cobalt (Co) Total Copper (Cu) Total Iron (Fe) Total Lead (Pb) Total Lithium (Li) Total Magnesium (Mg) Total Manganese (Mn) Total Molybdenum (Mo) Total Nickel (Ni) Total Phosphorus (P) Total Potassium (K) Total Selenium (Se) Total Silicon (Si) Total Silver (Ag) Total Sodium (Na) Total Strontium (Sr) Total Sulphur (S) Total Thallium (Tl) Total Tin (Sn) Total Titanium (Ti) Total Uranium (U) Total Vanadium (V) Total Zinc (Zn) 0.32 < < < < < < < < <0.010 <0.0 < < <0.000 < < < < < < < < < <0.010 <0.0 < < <0.000 < < < < < < < < < < <0.000 < < < < < < < <0.0 < <0.000 < < < < < RDL = Reportable Detection Limit Page 13 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

27 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW REGULATED METALS (CCME/AT1) - TOTAL Maxxam ID Sampling Date COC Number UH /09/10 UH /09/10 UH /09/10 UNITS CHANNEL 1 CHANNEL 2 DUP 1 RDL QC Batch Elements Total Aluminum (Al) Total Antimony (Sb) Total Arsenic (As) Total Barium (Ba) Total Beryllium (Be) Total Boron (B) Total Cadmium (Cd) Total Calcium (Ca) Total Chromium (Cr) Total Cobalt (Co) Total Copper (Cu) Total Iron (Fe) Total Lead (Pb) Total Lithium (Li) Total Magnesium (Mg) Total Manganese (Mn) Total Molybdenum (Mo) Total Nickel (Ni) Total Phosphorus (P) Total Potassium (K) Total Selenium (Se) Total Silicon (Si) Total Silver (Ag) Total Sodium (Na) Total Strontium (Sr) Total Sulphur (S) Total Thallium (Tl) Total Tin (Sn) Total Titanium (Ti) Total Uranium (U) Total Vanadium (V) Total Zinc (Zn) 0.17 < <0.0 < <0.000 < < < < < < <0.0 < <0.000 < < < < < < <0.010 <0.0 < < <0.000 < < < < < < < < < RDL = Reportable Detection Limit Page 14 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

28 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW PETROLEUM HYDROCARBONS (CCME) Maxxam ID UH3068 UH3069 UH3074 Sampling Date 18/09/10 18/09/10 18/09/10 COC Number UNITS LARRY LAKE NORTH LARRY LAKE SOUTH DUP 1 RDL QC Batch Ext. Pet. Hydrocarbon C6-C50 Hydrocarbons <0.26 <0.26 < RDL = Reportable Detection Limit Page 15 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

29 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW GENERAL COMMENTS Each temperature is the average of up to three cooler temperatures taken at receipt Package 1 Package 2 Package 3 Package 4 Package C 3.3 C 4.7 C 7.0 C 6.7 C Sample UH3067 [PHASE 1 TREH] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3068 [LARRY LAKE NORTH] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3069 [LARRY LAKE SOUTH] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3070 [NORTH POND] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3071 [SOUTH POND] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3072 [CHANNEL 1] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3073 [CHANNEL 2] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Sample UH3074 [DUP 1] : Sample was analyzed past method specified hold time for NO2 - NO2 + NO3 (N) by CFA. Exceedance of hold time increases the uncertainty of test results but does not necessarily imply that results are compromised. Results relate only to the items tested. Page 16 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

30 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter Date Matrix Spike % Recovery QC Limits Spiked Blank % Recovery QC Limits Method Blank Value UNITS RPD Value (%) QC Limits O-TERPHENYL (sur.) 1,4-Difluorobenzene (sur.) 4-Bromofluorobenzene (sur.) D4-1,2-Dichloroethane (sur.) F2 (C10-C16 Hydrocarbons) F3 (C16-C34 Hydrocarbons) F4 (C34-C50 Hydrocarbons) Total Aluminum (Al) Total Antimony (Sb) Total Arsenic (As) Total Beryllium (Be) Total Cadmium (Cd) Total Chromium (Cr) Total Cobalt (Co) Total Copper (Cu) Total Lead (Pb) Total Molybdenum (Mo) Total Nickel (Ni) Total Selenium (Se) Total Silver (Ag) Total Thallium (Tl) Total Tin (Sn) Total Titanium (Ti) Total Uranium (U) Total Vanadium (V) Total Zinc (Zn) Total Barium (Ba) Total Boron (B) Total Calcium (Ca) Total Iron (Fe) Total Lithium (Li) 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/ <0.10 <0.10 <0. < < <0.000 < < <0.000 <0.000 <0.000 < <0.000 < <0.000 < < <0.010 <0.0 <0.30 <0.060 <0.0 % % % % Page 17 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

31 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT(CONT'D) STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter Date Matrix Spike % Recovery QC Limits Spiked Blank % Recovery QC Limits Method Blank Value UNITS RPD Value (%) QC Limits Total Magnesium (Mg) Total Manganese (Mn) Total Phosphorus (P) Total Potassium (K) Total Silicon (Si) Total Sodium (Na) Total Strontium (Sr) Total Sulphur (S) Benzene Ethylbenzene F1 (C6-C10) m & p-xylene o-xylene Toluene Dissolved Chloride (Cl) Dissolved Sulphate (SO4) Dissolved Barium (Ba) Dissolved Boron (B) Dissolved Calcium (Ca) Dissolved Iron (Fe) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Silicon (Si) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Aluminum (Al) Dissolved Antimony (Sb) 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/15 18/09/15 18/09/15 18/09/15 18/09/15 18/09/15 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/ N <0. < <0.10 <0.30 <0.10 <0.50 <0.0 <0. <0.40 <0.40 < <0.80 <0.40 <0.40 <0.010 <0.0 <0.30 <0.060 <0.0 <0. < <0.10 <0.30 <0.10 <0.50 <0.0 <0. < < ug/l ug/l ug/l ug/l ug/l ug/l Page 18 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

32 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT(CONT'D) STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter Date Matrix Spike % Recovery QC Limits Spiked Blank % Recovery QC Limits Method Blank Value UNITS RPD Value (%) QC Limits Dissolved Arsenic (As) Dissolved Beryllium (Be) Dissolved Cadmium (Cd) Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Lead (Pb) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Selenium (Se) Dissolved Silver (Ag) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) Dissolved Chloride (Cl) ph Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) Hydroxide (OH) Conductivity Dissolved Sulphate (SO4) ph Alkalinity (PP as CaCO3) Alkalinity (Total as CaCO3) Bicarbonate (HCO3) Carbonate (CO3) 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/15 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/14 18/09/15 18/09/14 18/09/14 18/09/14 18/09/14 18/09/ <0.000 < < <0.000 <0.000 <0.000 < <0.000 < <0.000 < < <2.0 us/cm Page 19 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

33 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT(CONT'D) STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter Date Matrix Spike % Recovery QC Limits Spiked Blank % Recovery QC Limits Method Blank Value UNITS RPD Value (%) QC Limits Hydroxide (OH) Conductivity Dissolved Barium (Ba) Dissolved Boron (B) Dissolved Calcium (Ca) Dissolved Iron (Fe) Dissolved Lithium (Li) Dissolved Magnesium (Mg) Dissolved Manganese (Mn) Dissolved Phosphorus (P) Dissolved Potassium (K) Dissolved Silicon (Si) Dissolved Sodium (Na) Dissolved Strontium (Sr) Dissolved Sulphur (S) Dissolved Nitrate plus Nitrite (N) Dissolved Nitrite (N) Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Beryllium (Be) Dissolved Cadmium (Cd) Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Lead (Pb) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Selenium (Se) Dissolved Silver (Ag) Dissolved Thallium (Tl) 18/09/14 18/09/14 18/09/14 18/09/14 18/09/15 18/09/15 18/09/14 18/09/15 18/09/15 18/09/14 18/09/15 18/09/14 18/09/15 18/09/14 18/09/14 18/09/16 18/09/16 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 22 (1) <2.0 <0.010 <0.0 <0.30 <0.060 <0.0 <0. < <0.10 <0.30 <0.10 <0.50 <0.0 <0. <0.0 <0.010 < < <0.000 < < <0.000 <0.000 <0.000 < <0.000 < <0.000 us/cm Page of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

34 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT(CONT'D) STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter Date Matrix Spike % Recovery QC Limits Spiked Blank % Recovery QC Limits Method Blank Value UNITS RPD Value (%) QC Limits Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) Dissolved Zinc (Zn) Dissolved Aluminum (Al) Dissolved Antimony (Sb) Dissolved Arsenic (As) Dissolved Beryllium (Be) Dissolved Cadmium (Cd) Dissolved Chromium (Cr) Dissolved Cobalt (Co) Dissolved Copper (Cu) Dissolved Lead (Pb) Dissolved Molybdenum (Mo) Dissolved Nickel (Ni) Dissolved Selenium (Se) Dissolved Silver (Ag) Dissolved Thallium (Tl) Dissolved Tin (Sn) Dissolved Titanium (Ti) Dissolved Uranium (U) Dissolved Vanadium (V) 18/09/17 18/09/17 18/09/17 18/09/17 18/09/17 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/18 18/09/ < < < < <0.000 < < <0.000 <0.000 <0.000 < <0.000 < <0.000 < Page 21 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

35 Maxxam Job #: B Report Date: 18/09/19 QUALITY ASSURAE REPORT(CONT'D) STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW QC Batch Parameter = Not Applicable Dissolved Zinc (Zn) Date 18/09/18 % Recovery Matrix Spike QC Limits Duplicate: Paired analysis of a separate portion of the same sample. Used to evaluate the variance in the measurement. % Recovery Spiked Blank Matrix Spike: A sample to which a known amount of the analyte of interest has been added. Used to evaluate sample matrix interference. QC Limits Method Blank Value < Spiked Blank: A blank matrix sample to which a known amount of the analyte, usually from a second source, has been added. Used to evaluate method accuracy. Method Blank: A blank matrix containing all reagents used in the analytical procedure. Used to identify laboratory contamination. Surrogate: A pure or isotopically labeled compound whose behavior mirrors the analytes of interest. Used to evaluate extraction efficiency. (Matrix Spike): The recovery in the matrix spike was not calculated. The relative difference between the concentration in the parent sample and the spike amount was too small to permit a reliable recovery calculation (matrix spike concentration was less than the native sample concentration) (1) Recovery or RPD for this parameter is outside control limits. The overall quality control for this analysis meets acceptability criteria. UNITS Value (%) (Duplicate RPD): The duplicate RPD was not calculated. The concentration in the sample and/or duplicate was too low to permit a reliable RPD calculation (absolute difference <= 2x RDL). 10 RPD QC Limits Page 22 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

36 Maxxam Job #: B Report Date: 18/09/19 STANTEC CONSULTING LTD Client Project #: Sampler Initials: BW VALIDATION SIGNATURE PAGE The analytical data and all QC contained in this report were reviewed and validated by the following individual(s). Daniel Reslan, cct, QP, Organics Manager Justin Geisel, B.Sc., Organics Supervisor Winnie Au, B.Sc., QP, Scientific Specialist Maxxam has procedures in place to guard against improper use of the electronic signature and have the required "signatories", as per section of ISO/IEC 17025:05(E), signing the reports. For Service Group specific validation please refer to the Validation Signature Page. Page 23 of 26 Maxxam Analytics International Corporation o/a Maxxam Analytics Edmonton: th Street T6B 2R4 Telephone (780)577-7 Fax (780)

37 Maxxam Job #: B Report Date: 18/09/19 Maxxam Sample: UH3068 STANTEC CONSULTING LTD Client Project #: Client ID: LARRY LAKE NORTH CCME Hydrocarbons (F2-F4 in water) Chromatogram Note: This information is provided for reference purposes only. Should detailed chemist interpretation or fingerprinting be required, please contact the laboratory. Page 24 of 26

38 Maxxam Job #: B Report Date: 18/09/19 Maxxam Sample: UH3069 STANTEC CONSULTING LTD Client Project #: Client ID: LARRY LAKE SOUTH CCME Hydrocarbons (F2-F4 in water) Chromatogram Note: This information is provided for reference purposes only. Should detailed chemist interpretation or fingerprinting be required, please contact the laboratory. Page 25 of 26

39 Maxxam Job #: B Report Date: 18/09/19 Maxxam Sample: UH3074 STANTEC CONSULTING LTD Client Project #: Client ID: DUP 1 CCME Hydrocarbons (F2-F4 in water) Chromatogram Note: This information is provided for reference purposes only. Should detailed chemist interpretation or fingerprinting be required, please contact the laboratory. Page 26 of 26

40 Appendix K Panda/Koala Conveyor Memo and Authorization Street SW, Calgary, AB, Canada, T2P 1T1 T F

41 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P 1T1 (403) fax 25 July, 18 North Slave Regional Office Department of Lands Government of the Northwest Territories #16 Yellowknife Airport Yellowknife, NT X1A 3T2 Attention: Marty Sanderson Manager, Diamond Resource Management INTRODUCTION Koala Underground ore production is scheduled for completion at the end of December 18. Reclamation of the Koala and Panda Underground workings is required prior to processed kimberlite deposition and pit flooding activities. As part of this process, Dominion Diamond Ekati ULC s strategy is to leave the entire underground conveyor system intact, and complete the following remediation actions: Drain hydraulic oil from all gearboxes, hydraulic take ups, and other units as applicable; and Purge grease from pulleys and other non-sealed units and replace with Mobile SHC Grease 102 EAL (per GNWT Lands Authorization to use biodegradable grease underground memorandum - dated July 18) This technical memorandum and supporting documentation seeks authorization to leave the conveyor idler rollers underground. This request is driven by the safety risks associated with the removal of the rollers, and the low potential for any environmental effect. SAFETY RISKS In order to remove the idler rollers, the conveyor belt would need to be removed. This work requires clamping and cutting of the belt, which poses significant risk to workers who would be working at heights in tight quarters. There is an additional risk to damaging the roof support while working with mobile equipment near the connections between the conveyor frame and walls/roof of the mine. Damage to the roof supports poses a significant risk, as it compromises the ground conditions. These concerns, combined with other hazards associated with working in an underground environment, have the potential to result in injuries and represent a risk to worker health and safety. LOW POTENTIAL FOR ENVIRONMENTAL EFFECTS The low potential for environmental effects associated with leaving the idler rollers in place is a result of the following items: Record #:HSE RCD ENV 1036 Document Owner: Environment Department Date:25-July-18 Template # EKA TEM

42 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P 1T1 (403) fax 1. The Idler Rollers have limited quantities of hydrophilic grease, that if released individually would be below the reportable spill threshold and would not be considered a spill; 2. The grease is classified as inherently biodegradable and is not a TDG regulated substance (MSDS); and 3. The water pressure exerted on the bearings will enhance the stability of the grease in situ. 1. Idlers and Roller Grease Volumes In an effort to determine the total amount of grease per bearing, Dominion contacted the roller manufacturer, Luff Industries Ltd., and requested that the manufacturer provide a technical memorandum detailing the anticipated volumes of grease within each component (Appendix A). Idlers provided by Luff Industries are factory packed, sealed bearings that are run to failure. Individual release of grease from bearings would be well below the reportable spill volume of L. Upon review of the conveyance systems specifications, the following represents a summary of Idlers and Rollers that contain grease within the Panda and Koala conveyor system: Table 1: Grease in Panda/Koala Conveyor System Luff Description Quantity Grease Volume per Grease Volume (L) Installed unit (L) 6" Steel Roller CEMA D " Impact Roller CEMA D " Steel Return Roller CEMA D 6" Steel Roller CEMA D c/w High Moisture Seal 4" Urethane Guide Roller " Rubber Disc Return Idler CEMA E 6" Disc Return Roller CEMA D 6" Rubber Disc Return Roller CEMA D 6" Steel Roller CEMA E Total Grease Volume (L) Biodegradable Grease Esso Epic EP-102 used in the conveyor system is both a non-tdg classified substance and classified as inherently biodegradable. Inherently biodegradable materials must achieve greater than % biodegradation within the first 28 days. Record #:HSE RCD ENV 1036 Document Owner: Environment Department Date:25-July-18 Template # EKA TEM

43 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P 1T1 (403) fax 3. Water Action and Bearing Response As the main bearing housings are not completely full of grease there will be air space within the cavity. Once the mine is flooded water could be forced through the labyrinth seals and into the bearing housing. The water will either displace the air out of the housing or compress the trapped air within the housing. Some water will end up in the bearing housing that contains the grease. The grease should not be displaced as it will not compress, has a high viscosity rating, and low emulsion factor (will not mix with water easily should it stay in current state). Once water enters the bearing house, inside the sealed bearing, there will not be any water flow through the grease containment. When the mine is completely flooded the water pressure on the bearings will be equal in all different directions to hold the grease in location. Once the underground workings are flooded there is no expectation of significant current or flow allowing no grease movement. CLOSING Dominion is seeking the Inspector s approval to leave in place the idler rollers associated with the Panda and Koala conveyor system at the Ekati mine because the safety concerns associated with removing the idler rollers from the underground outweigh the low potential for environmental effects associated with leaving the idler rollers in place. Thank you for your consideration of this request. Dominion trusts that the information provided is complete and clear, and we remain available to discuss the closure of underground workings in further detail. If you have any questions or concerns, please feel free to contact the undersigned or Kurtis Trefry at kurtis.trefry@ddcorp.ca or ext Sincerely, April Hayward, Ph.D. Superintendent, Environment Record #:HSE RCD ENV 1036 Document Owner: Environment Department Date:25-July-18 Template # EKA TEM

44 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P 1T1 (403) fax Appendix A: Grease Amounts for Luff Industry Rollers at Dominion Diamond Ekati Diamond Mine Record #:HSE RCD ENV 1036 Document Owner: Environment Department Date:25-July-18 Template # EKA TEM

45 LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833) Grease amounts for Luff Industries rollers underground at Dominion Diamond Ekati diamond mine March 29, 18 This document is meant to confirm the LACK of possibility of grease escaping from Luff Industries rollers installed underground at Dominion Diamond Ekati diamond mine. Examples of bearings and seals below: 6DS19 6" Steel Roller CEMA D containing a total of 16ml of grease as per below: - Two RS bearings with rubber seals each containing 8ml of Sinopec 7029D grease CONVEYING PERFORMAE

46 LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833) - Two orange external HMS High Moisture Seals each containing 15ml of Esso Epic EP-102 grease (sample steel roller cutaway shown. Disc return cavity size is the same) CONVEYING PERFORMAE

47 CONVEYING PERFORMAE LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833)

48 CONVEYING PERFORMAE LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833)

49 CONVEYING PERFORMAE LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833)

50 CONVEYING PERFORMAE LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833)

51 LUFF INDUSTRIES LTD Wrangler Road Rocky View, Alberta, Canada T1X 0K3 P: F: TOLL-FREE: LUFF (5833) It can be seen from the photos that the possible exposure to the grease in the bearings would be negligible, due to the rubber seals. For the limited number of rollers fitted with the HMS High Moisture Seals, the possibility of the grease escaping would be minimal based on the circumferential gap of the disc seals to the end of the roller. If you have any questions, please feel free to contact the undersigned. Roy Wilks Canadian Sales Manager Distribution & Engineering Cell: CONVEYING PERFORMAE

52 Lands - North Slave Region July 31 th 18 Dominion Diamond Mine Koala Area Mining th St. SW Lease 76D/10-2 Calgary AB, X2P 1T1 Attn: April Hayward Superintendent, Environment Re: Underground Closure Request to leave the underground conveyor system intact following closure Dear Ms. Hayward, This letter is in response to a request submitted by Dominion Diamond Mine on July 25 th 18, to leave the entire underground conveyor system intact following closure. The Inspector has reviewed Dominion Diamond s request to leave the entire underground conveyor system intact and agrees with the proposal. Removal and disposal of the conveyor system would create legitimate safety concerns with working at heights and in tight quarters. Additional safety risks have been noted using mobile equipment in and around the conveyor system, and the walls and roof of the mine. Dominion Diamond has demonstrated that leaving the roller bearings in situ will result in a low potential for environmental effects. All idler roller bearings are sealed and grease contained within these bearings will likely remain within the sealed unit. It has also been brought to the Inspectors attention that the water pressure exerted on the bearings will enhance the stability of the grease in situ. The Inspector has also provided an authorization letter dated July th 18 to use non-toxic biodegradable Mobile SHC Grease 102 EAL in the larger serviceable bearings. The Inspector hereby grants authorization to leave the conveyor system intact underground with the following conditions: Drain hydraulic oil from all gearboxes, hydraulic take ups, and other units as applicable. All gearboxes, hydraulic take ups and other applicable units in the underground Government of the Northwest Territories, 140 Bristol Avenue, Yellowknife, N.W.T. Canada X1A 3T2

53 workings will need to be tagged and documented. This documentation is to be provided to the Inspector and will be inspected prior to final closure. Purge grease from pulleys and other non-sealed units and replace with Mobile SHC Grease 102 EAL (per GNWT Lands Authorization to use biodegradable grease underground memorandum - dated July 18) All hydrocarbon based grease that is purged from bearing cases and any additional grease that has fallen to the ground is cleaned up and disposed to an approved facility. The tagging, purging and servicing of all bearings shall be documented. This documentation is to be provided to the Inspector upon request. Trusting this is satisfactory. If you have any questions or concerns about this decision, please contact the Inspector at (867) ext: Sincerely, Marty Sanderson Manager-Diamond Resource Management GNWT-Department of Lands North Slave Region Marty_Sanderson@gov.nt.ca cc: Mr. Scott Stewart - Regional Superintendent Department of Lands Mr. Kurtis Trefry, Dominion Diamond Mine Government of the Northwest Territories, 140 Bristol Avenue, Yellowknife, N.W.T. Canada X1A 3T2

54 Appendix L Panda/Koala Biodegradable Grease Memo and Authorization Street SW, Calgary, AB, Canada, T2P 1T1 T F

55 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P1T1 (403) fax May 17, 18 North Slave Regional Office Department of Lands Government of the Northwest Territories #16 Yellowknife Airport Yellowknife, NT X1A 3T2 Attention: Marty Sanderson Manager, Diamond Resource Management Re: Underground Closure Request to leave biodegradable grease underground following closure Introduction Koala Underground ore production is scheduled for completion at the end of December 18. Reclamation of the Koala and Panda Underground workings is required prior to processed kimberlite deposition and pit flooding activities. As a form of progressive reclamation, Dominion plans to utilize biodegradable grease (Mobile SHC Grease 102 EAL) on pullies of the Panda/Koala conveyor system and for any other required purposes. It is anticipated that by following the regular maintenance schedule already in place for underground workings, the majority of grease in the underground workings could be replaced with a biodegradable product that will not need to be purged from the system at closure. Dominion s intention is to leave the product in place upon closure of underground working and Dominion is seeking the Inspector s approval to do so. Domionion s decision to use Mobile SHC Grease 102 EAL and leave the product in place in the underground at closure is based on the fact that it is non hazardous and is classified as readily biodegradable as described in greater detail, below. Lubricant Biodegradability Testing Biodegredation is the chemical breakdown of materials by living organisms (or their enzymes) in the environment. Certain chemical structures are more susceptible to microbial breakdown than others; vegetable oils and synthetic esters, for example, will biodegrade more rapidly than mineral oils under the same conditions. Ultimately, biodegradation testing is used to determine if a material is inherently biodegradable or readily biodegrdable. OECD (Organisation for Economic Co-operation and Development) classifications give a value for the percentage of lubricant biodegradable within 28 days. Below are the requirements under the OECD testing to fit into either category: Record #:HSE RCD ENV 974 Document Owner: Environment Department Date:18-May-18 Template # EKA TEM

56 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P1T1 (403) fax Readily Biodegradable Must achieve greater than 60% biodegradation in 28 days Must pass the 10-day window criterion, which means that once the 10% biodegradation has been attained, test material must then reach the 60% biodegradation mark within 10 days Inherently biodegradable Must achieve greater than % biodegradation within the 28 days Mobile SHC Grease 102 EAL - Specifications The Mobile SHC Grease 102 EAL was selected for the Panda/Koala Underground working because of its specific design for applications that require environmentally sensitive lubricants. Mobile SHC Grease 102 EAL is not considerd to be hazardous according to the MSDS and is classified as readily biodegradable with 74% biodegraded within 28 days. For an overview of the product benefits and specifications view Table 1. Please see Appendix A (Mobile SHC Grease EAL Series) and Appendix B (MSDS Mobil SHC Grease 102 EAL) for further information. Table 1: Product Specifications (Mobil, 17) Property Mobile SHC Grease 102 EAL NLGI Grade 2 Thickener Type Lithium Color, Visual Tan ISO Viscosity Grade of Oil Dropping Point, ASTM D 2265, ºC 180 Worked Penetration, ASTM D 217, C Water 79ºC, ASTM D 1264, wt% 6.5 EMCOR Bearing Corrosion in Distilled Water, 0,0 ASTM D 6138, Rating Copper Corrosion, ASTM D 4048, Rating la Four Ball Weld, ASTM D 2596, kgf 0 Four Ball Load Wear Index, ASTM D 2596, kgf 34 US Steel -18 C, g/min 50 Low Temperature -30 C, Start/Run, 800/170 ASTM D 1478, gcm Biodegradability of ester base oil, OECD 301B, 74 (Readily biodegradable) wt% Aquatic Toxicity, OECD 3, LL50 ppm >00 (Virtually non-toxic) Product Implementation and Documentation The ultilization of Mobil SHC Grease 102 EAL in the underground workings is intended to be a form of progressive reclamation. Dominion plans to replace current greasing systems in the Record #:HSE RCD ENV 974 Document Owner: Environment Department Date:18-May-18 Template # EKA TEM

57 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P1T1 (403) fax Panda/Koala Underground with the product with the intention of leaving the biodegradable, nontoxic, non-hazardous grease in place during processed kimberlite deposition and pit flooding activities. Grease will be replaced as required by current maintenance schedules, but it is anticipated that all grease will be replaced with Mobil SHC Grease 102 EAL by the end of operations in December 18. Dominion is commited to maintaining an adequate level of documentation to ensure the inspectors that only biodegradable grease will remain in the underground workings. In addition, a tagging system will be developed to aid in visual confirmation as to which components have been purged and replaced with Mobil SHC Grease 102. Dominion will show examples of the tagging systems and progressive reclamation through grease exchanges to GNWT Inspectors during future Panda/Koala Underground inspections leading towards final closure. Closing Dominion is seeking the Inspector s approval leave Mobil SHC Grease 102 EAL in the underground workings at closure. The Mobil SHC Grease 102 EAL is a proven product that would provide no environmental risk to water quality after the flooding of underground workings. Dominion intends to utilize this product wherever feasible for the underground workings. Dominion would like to secure the Inspector s approval to leave Mobil SHC Grease 102 EAL in place at closure before beginning the transition to using Mobil SHC Grease 102 EAL in the underground workings. The transition to Mobil SHC Grease 102 EAL is scheduled to begin in the latter half of June, 18. Thank you for your consideration of this request. Dominion trusts that the information provided is complete and clear, and we remain available to discuss the progressive reclamation practice in further detail. If you have any questions, please feel free to contact the undersigned or Kurtis Trefry at kurtis.trefry@ddcorp.ca or ext Sincerely, April Hayward, Ph.D. Superintendent, Environment Record #:HSE RCD ENV 974 Document Owner: Environment Department Date:18-May-18 Template # EKA TEM

58 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P1T1 (403) fax Appendix A: Mobile SHC Grease EAL Series Record #:HSE RCD ENV 930 Document Owner: Environment Department Date:16-March-18 Template # EKA TEM

59 Mobil SHC Grease EAL Series Page 1 of 3 Mobil SHC Grease EAL Series Grease Mobil, Canada Grease Product Description Mobil SHC Grease 101 EAL and 102 EAL are superior performance greases designed specifically for applications that require environmentally sensitive lubricants. These high performance greases are biodegradable and virtually non-toxic. They are formulated from a biodegradable synthetic ester base oil, carefully chosen high performance additives and a lithium soap thickener. The wax-free nature of the synthetic base fluid, together with its low traction coefficient, provide excellent low temperature pumpability and very low starting and running torque - a significant benefit considering that many environmentally sensitive applications are outdoors. The Mobil SHC Grease EAL Series is formulated for applications where grease leakage or run out could contaminate soil, groundwater, surface water systems, or indoor plant water systems. They are recommended for plain and rolling element bearings and couplings that operate at temperatures from -40ºC to 1ºC, with appropriate adjustments to re-lubrication interval. Mobil SHC Grease 101 EAL and 102 EAL are NLGI grade 1 and 2 respectively. Features and Potential Benefits The Mobil EAL brand of environmentally sensitive products has gained an exceptional reputation with OEMs and customers for its excellent performance. These greases provide the optimum balance between the need for environmentally friendly lubricants and the requirement for high performance lubricants for mobile and stationary mechanical equipment Mobil SHC Grease EAL Series greases are compatible with the previous generation Mobilgrease EAL Series. Mobil SHC Grease 101 EAL and 102 EAL offer the following benefits: Features Virtually non-toxic in the OECD 3 Method Aquatic Toxicity Test Formulated from biodegradable synthetic ester base oil Good adhesion and water resistance Advantages and Potential Benefits Minimal effects of spills on environment Biodegradation of material in sensitive areas with minimal non-biodegradable residue, avoidance of costly clean-up in some jurisdictions Resists water washout, avoiding need for frequent re-greasing Excellent rust and corrosion protection Excellent bearing protection in wet conditions, with long bearing life

60 Mobil SHC Grease EAL Series Page 2 of 3 Applications Mobil SHC Grease 101 EAL and 102 EAL are members of the Mobil family of Environmental Awareness Lubricants (EAL) and are specifically designed for applications where contamination of the environment is a risk. Marine equipment Water treatment plants Dams, locks and water ways Construction equipment Farm machinery Hydroelectric generation plants Specifications and Approvals Mobil SHC Grease EAL meets or exceeds the requirements of: DIN 51825: (04-06) KPE1K-40 KPE2K-40 Typical Properties Mobil SHC Grease EAL Series NLGI Grade 1 2 Thickener Type Lithium Lithium Color, Visual Tan Tan ISO Viscosity Grade of Oil Dropping Point, ASTM D 2265, ºC Worked Penetration, ASTM D 217, 25 C Water 79ºC, ASTM D 1264, wt% EMCOR Bearing Corrosion in Distilled Water, ASTM D 6138, Rating 0,0 0,0 Copper Corrosion, ASTM D 4048, Rating 1a 1a Four Ball Weld, ASTM D 2596, kgf 0 0 Four Ball Load Wear Index, ASTM D 2596, kgf US Steel -18 C, g/min - 50 Low Temperature -30 C, Start/Run, ASTM D 1478, gcm - 800/170 Biodegradability of ester base oil, OECD 301B, wt% Aquatic Toxicity, OECD 3, LL50 ppm >00 >

61 Mobil SHC Grease EAL Series Page 3 of 3 Health and Safety Based on available information, this product is not expected to produce adverse effects on health when used for the intended application and the recommendations provided in the Material Safety Data Sheet (MSDS) are followed. MSDS's are available upon request through your sales contract office, or via the Internet. This product should not be used for purposes other than its intended use. If disposing of used product, take care to protect the environment. All trademarks used herein are trademarks or registered trademarks of Exxon Mobil Corporation or one of its subsidiaries unless indicated otherwise Imperial Oil Petroleum and Chemicals Division Lubricants and Specialties 240 Fourth Ave SW C. P. 2480, Station M Calgary AB T2P 3 M Typical Properties are typical of those obtained with normal production tolerance and do not constitute a specification. Variations that do not affect product performance are to be expected during normal manufacture and at different blending locations. The information contained herein is subject to change without notice. All products may not be available locally. For more information, contact your local ExxonMobil contact or visit ExxonMobil is comprised of numerous affiliates and subsidiaries, many with names that include Esso, Mobil, or ExxonMobil. Nothing in this document is intended to override or supersede the corporate separateness of local entities. Responsibility for local action and accountability remains with the local ExxonMobil-affiliate entities. Copyright Exxon Mobil Corporation. All Rights Reserved

62 Dominion Diamond Ekati ULC Street SW (403) Calgary, Alberta T2P1T1 (403) fax Appendix B: MSDS - Mobil SHC Grease 102 EAL Record #:HSE RCD ENV 930 Document Owner: Environment Department Date:16-March-18 Template # EKA TEM

63 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 1 of 9 MATERIAL SAFETY DATA SHEET SECTION 1 PRODUCT AND COMPANY IDENTIFICATION PRODUCT Product Name: MOBIL SHC GREASE 102 EAL Product Description: Synthetic Base Stocks and Additives Product Code: 15A03080, , 97AZ30 Intended Use: Grease COMPANY IDENTIFICATION Supplier: EXXON MOBIL CORPORATION 3225 GALLOWS RD. FAIRFAX, VA. 237 USA 24 Hour Health Emergency Transportation Emergency Phone ExxonMobil Transportation No Product Technical Information , MSDS Internet Address SECTION 2 COMPOSITION / INFORMATION ON INGREDIENTS No Reportable Hazardous Substance(s) or Complex Substance(s). SECTION 3 HAZARDS IDENTIFICATION This material is not considered to be hazardous according to regulatory guidelines (see (M)SDS Section 15). POTENTIAL HEALTH EFFECTS Low order of toxicity. Excessive exposure may result in eye, skin, or respiratory irritation. High-pressure injection under skin may cause serious damage. NFPA Hazard ID: Health: 0 Flammability: 1 Reactivity: 0 HMIS Hazard ID: Health: 0 Flammability: 1 Reactivity: 0 NOTE: This material should not be used for any other purpose than the intended use in Section 1 without expert advice. Health studies have shown that chemical exposure may cause potential human health risks which may vary from person to person. SECTION 4 FIRST AID MEASURES INHALATION Under normal conditions of intended use, this material is not expected to be an inhalation hazard.

64 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 2 of 9 SKIN CONTACT Wash contact areas with soap and water. If product is injected into or under the skin, or into any part of the body, regardless of the appearance of the wound or its size, the individual should be evaluated immediately by a physician as a surgical emergency. Even though initial symptoms from high pressure injection may be minimal or absent, early surgical treatment within the first few hours may significantly reduce the ultimate extent of injury. EYE CONTACT Flush thoroughly with water. If irritation occurs, get medical assistance. INGESTION First aid is normally not required. Seek medical attention if discomfort occurs. SECTION 5 FIRE FIGHTING MEASURES EXTINGUISHING MEDIA Appropriate Extinguishing Media: Use water fog, foam, dry chemical or carbon dioxide (CO2) to extinguish flames. Inappropriate Extinguishing Media: Straight Streams of Water FIRE FIGHTING Fire Fighting Instructions: Evacuate area. Prevent runoff from fire control or dilution from entering streams, sewers, or drinking water supply. Firefighters should use standard protective equipment and in enclosed spaces, self-contained breathing apparatus (SCBA). Use water spray to cool fire exposed surfaces and to protect personnel. Hazardous Combustion Products: Smoke, Fume, Aldehydes, Sulfur oxides, Incomplete combustion products, Oxides of carbon FLAMMABILITY PROPERTIES Flash Point [Method]: 232C (450F) [EST. FOR OIL, ASTM D-92 (COC)] Flammable Limits (Approximate volume % in air): LEL: N/D UEL: N/D Autoignition Temperature: N/D SECTION 6 ACCIDENTAL RELEASE MEASURES NOTIFICATION PROCEDURES In the event of a spill or accidental release, notify relevant authorities in accordance with all applicable regulations. US regulations require reporting releases of this material to the environment which exceed the applicable reportable quantity or oil spills which could reach any waterway including intermittent dry creeks. The National Response Center can be reached at (800) PROTECTIVE MEASURES Avoid contact with spilled material. See Section 5 for fire fighting information. See the Hazard Identification Section for Significant Hazards. See Section 4 for First Aid Advice. See Section 8 for advice on the minimum

65 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 3 of 9 requirements for personal protective equipment. Additional protective measures may be necessary, depending on the specific circumstances and/or the expert judgment of the emergency responders. SPILL MANAGEMENT Land Spill: Scrape up spilled material with shovels into a suitable container for recycle or disposal. Water Spill: Stop leak if you can do it without risk. Confine the spill immediately with booms. Warn other shipping. Skim from surface. Water spill and land spill recommendations are based on the most likely spill scenario for this material; however, geographic conditions, wind, temperature, (and in the case of a water spill) wave and current direction and speed may greatly influence the appropriate action to be taken. For this reason, local experts should be consulted. Note: Local regulations may prescribe or limit action to be taken. ENVIRONMENTAL PRECAUTIONS Prevent entry into waterways, sewers, basements or confined areas. SECTION 7 HANDLING AND STORAGE HANDLING Prevent small spills and leakage to avoid slip hazard. Static Accumulator: This material is not a static accumulator. STORAGE Do not store in open or unlabelled containers. Keep away from incompatible materials. SECTION 8 EXPOSURE CONTROLS / PERSONAL PROTECTION NOTE: Limits/standards shown for guidance only. Follow applicable regulations. ENGINEERING CONTROLS The level of protection and types of controls necessary will vary depending upon potential exposure conditions. Control measures to consider: No special requirements under ordinary conditions of use and with adequate ventilation. PERSONAL PROTECTION Personal protective equipment selections vary based on potential exposure conditions such as applications, handling practices, concentration and ventilation. Information on the selection of protective equipment for use with this material, as provided below, is based upon intended, normal usage. Respiratory Protection: If engineering controls do not maintain airborne contaminant concentrations at a level which is adequate to protect worker health, an approved respirator may be appropriate. Respirator

66 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 4 of 9 selection, use, and maintenance must be in accordance with regulatory requirements, if applicable. Types of respirators to be considered for this material include: No protection is ordinarily required under normal conditions of use and with adequate ventilation. For high airborne concentrations, use an approved supplied-air respirator, operated in positive pressure mode. Supplied air respirators with an escape bottle may be appropriate when oxygen levels are inadequate, gas/vapor warning properties are poor, or if air purifying filter capacity/rating may be exceeded. Hand Protection: Any specific glove information provided is based on published literature and glove manufacturer data. Glove suitability and breakthrough time will differ depending on the specific use conditions. Contact the glove manufacturer for specific advice on glove selection and breakthrough times for your use conditions. Inspect and replace worn or damaged gloves. The types of gloves to be considered for this material include: No protection is ordinarily required under normal conditions of use. Eye Protection: If contact is likely, safety glasses with side shields are recommended. Skin and Body Protection: Any specific clothing information provided is based on published literature or manufacturer data. The types of clothing to be considered for this material include: No skin protection is ordinarily required under normal conditions of use. In accordance with good industrial hygiene practices, precautions should be taken to avoid skin contact. Specific Hygiene Measures: Always observe good personal hygiene measures, such as washing after handling the material and before eating, drinking, and/or smoking. Routinely wash work clothing and protective equipment to remove contaminants. Discard contaminated clothing and footwear that cannot be cleaned. Practice good housekeeping. ENVIRONMENTAL CONTROLS See Sections 6, 7, 12, 13. SECTION 9 PHYSICAL AND CHEMICAL PROPERTIES Typical physical and chemical properties are given below. Consult the Supplier in Section 1 for additional data. GENERAL INFORMATION Physical State: Solid Form: Semi-fluid Color: Tan Odor: Characteristic Odor Threshold: N/D IMPORTANT HEALTH, SAFETY, AND ENVIRONMENTAL INFORMATION Relative Density (at 15 C): 0.97 Flash Point [Method]: 232C (450F) [EST. FOR OIL, ASTM D-92 (COC)] Flammable Limits (Approximate volume % in air): LEL: N/D UEL: N/D Autoignition Temperature: N/D Boiling Point / Range: > 316C (600F) [Estimated] Vapor Density (Air = 1): N/D Vapor Pressure: < kpa (0.1 mm Hg) at C [Estimated] Evaporation Rate (n-butyl acetate = 1): N/D

67 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 5 of 9 ph: Log Pow (n-octanol/water Partition Coefficient): N/D Solubility in Water: Negligible Viscosity: cst ( mm2/sec) at 40 C [Base oil] Oxidizing Properties: See Hazards Identification Section. OTHER INFORMATION Freezing Point: N/D Melting Point: N/D Decomposition Temperature: N/D NOTE: Most physical properties above are for the oil component in the material. SECTION 10 STABILITY AND REACTIVITY STABILITY: Material is stable under normal conditions. CONDITIONS TO AVOID: Excessive heat. High energy sources of ignition. MATERIALS TO AVOID: Strong oxidizers HAZARDOUS DECOMPOSITION PRODUCTS: Material does not decompose at ambient temperatures. HAZARDOUS POLYMERIZATION: Will not occur. SECTION 11 ACUTE TOXICITY Route of Exposure Inhalation Toxicity (Rat): LC50 > 5000 or MAC mg/m3 Irritation: No end point data. Ingestion Toxicity (Rat): LD50 > 5000 mg/kg Skin Toxicity (Rabbit): LD50 > 5000 mg/kg Irritation (Rabbit): Data available. Eye Irritation (Rabbit): Data available. TOXICOLOGICAL INFORMATION Conclusion / Remarks Minimally Toxic. Based on assessment of the components. Negligible hazard at ambient/normal handling temperatures. Based on assessment of the components. Minimally Toxic. Based on assessment of the components. Minimally Toxic. Based on assessment of the components. Negligible irritation to skin at ambient temperatures. Based on assessment of the components. May cause mild, short-lasting discomfort to eyes. Based on assessment of the components. CHRONIC/OTHER EFFECTS Contains: Synthetic base oils: Not expected to cause significant health effects under conditions of normal use, based on laboratory studies with the same or similar materials. Not mutagenic or genotoxic. Not sensitizing in test animals and humans.

68 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 6 of 9 Additional information is available by request. The following ingredients are cited on the lists below: None. --REGULATORY LISTS SEARCHED-- 1 = NTP CARC 3 = IARC 1 5 = IARC 2B 2 = NTP SUS 4 = IARC 2A 6 = OSHA CARC SECTION 12 ECOLOGICAL INFORMATION The information given is based on data available for the material, the components of the material, and similar materials. ECOTOXICITY Material -- Not expected to be harmful to aquatic organisms. MOBILITY Base oil component -- Low solubility and floats and is expected to migrate from water to the land. Expected to partition to sediment and wastewater solids. SECTION 13 DISPOSAL CONSIDERATIONS Disposal recommendations based on material as supplied. Disposal must be in accordance with current applicable laws and regulations, and material characteristics at time of disposal. DISPOSAL RECOMMENDATIONS Product is suitable for burning in an enclosed controlled burner for fuel value or disposal by supervised incineration at very high temperatures to prevent formation of undesirable combustion products. REGULATORY DISPOSAL INFORMATION RCRA Information: The unused product, in our opinion, is not specifically listed by the EPA as a hazardous waste (40 CFR, Part 261D), nor is it formulated to contain materials which are listed as hazardous wastes. It does not exhibit the hazardous characteristics of ignitability, corrositivity or reactivity and is not formulated with contaminants as determined by the Toxicity Characteristic Leaching Procedure (TCLP). However, used product may be regulated. Empty Container Warning Empty Container Warning (where applicable): Empty containers may contain residue and can be dangerous. Do not attempt to refill or clean containers without proper instructions. Empty drums should be completely drained and safely stored until appropriately reconditioned or disposed. Empty containers should be taken for recycling, recovery, or disposal through suitably qualified or licensed contractor and in accordance with governmental regulations. DO NOT PRESSURISE, CUT, WELD, BRAZE, SOLDER, DRILL, GRIND, OR EXPOSE SUCH CONTAINERS TO HEAT, FLAME, SPARKS, STATIC ELECTRICITY, OR OTHER SOURCES OF IGNITION. THEY MAY EXPLODE AND CAUSE INJURY OR DEATH.

69 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 7 of 9 SECTION 14 TRANSPORT INFORMATION LAND (DOT): Not Regulated for Land Transport LAND (TDG): Not Regulated for Land Transport SEA (IMDG): Not Regulated for Sea Transport according to IMDG-Code AIR (IATA): Not Regulated for Air Transport SECTION 15 REGULATORY INFORMATION OSHA HAZARD COMMUNICATION STANDARD: When used for its intended purposes, this material is not classified as hazardous in accordance with OSHA 29 CFR Complies with the following national/regional chemical inventory requirements:: EINECS, DSL, TSCA EPCRA: This material contains no extremely hazardous substances. SARA (311/312) REPORTABLE HAZARD CATEGORIES: None. SARA (313) TOXIC RELEASE INVENTORY: This material contains no chemicals subject to the supplier notification requirements of the SARA 313 Toxic Release Program. The following ingredients are cited on the lists below: Chemical Name CAS Number List Citations ZI, BIS(DIPENTYLCARBAMODITHIO ATO-S,S)-, (T-4) REGULATORY LISTS SEARCHED-- 1 = ACGIH ALL 6 = TSCA 5a2 11 = CA P65 REPRO 16 = MN RTK 2 = ACGIH A1 7 = TSCA 5e 12 = CA RTK 17 = NJ RTK 3 = ACGIH A2 8 = TSCA 6 13 = IL RTK 18 = PA RTK 4 = OSHA Z 9 = TSCA 12b 14 = LA RTK 19 = RI RTK 5 = TSCA 4 10 = CA P65 CARC 15 = MI 293 Code key: CARC=Carcinogen; REPRO=Reproductive SECTION 16 OTHER INFORMATION N/D = Not determined, = Not applicable

70 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 8 of 9 THIS SAFETY DATA SHEET CONTAINS THE FOLLOWING REVISIONS: Revision Changes: Section 10 Stability and Reactivity - Header was modified. Section 13: Disposal Recommendations - Note was modified. Section 11: Inhalation Lethality Conclusion was modified. Section 09: Boiling Point C(F) was modified. Section 08: Personal Protection was modified. Section 07: Handling and Storage - Handling was modified. Section 07: Handling and Storage - Storage Phrases was modified. Section 11: Dermal Lethality Test Data was modified. Section 11: Dermal Lethality Test Comment was modified. Section 11: Oral Lethality Test Data was modified. Section 11: Inhalation Lethality Test Data was modified. Section 11: Oral Lethality Test Comment was modified. Section 11: Inhalation Lethality Test Comment was modified. Section 06: Accidental Release - Spill Management - Water was modified. Section 09: Relative Density - Header was modified. Section 09: Flash Point C(F) was modified. Section 09: Viscosity was modified. Section 14: Sea (IMDG) - Header was modified. Section 14: Air (IATA) - Header was modified. Section 14: LAND (TDG) - Header was modified. Section 14: LAND (DOT) - Header was modified. Section 15: List Citation Table - Header was modified. Section 14: LAND (DOT) - Default was modified. Section 14: LAND (TDG) Default was modified. Section 14: Sea (IMDG) - Default was modified. Section 14: Air (IATA) - Default was modified. Section 11: Skin Irritation Conclusion was modified. Section 11: Inhalation Lethality Test Comment was modified. Section 15: National Chemical Inventory Listing - Header was modified. Section 15: National Chemical Inventory Listing was modified. Section 16: Code to MHCs was modified. Section 08: Exposure limits/standards was modified. Section 15: OSHA Hazard Communication Standard was modified. Hazard Identification: OSHA - May be Hazardous Statement was modified. Section 11: Chronic Tox - Component - Header was modified. Section 09: Oxidizing Properties was modified. Section 06: Protective Measures was added. Section 06: Accidental Release - Protective Measures - Header was added. Section 11: Other Health Effects Header was added. Section 11: Chronic Tox - Component was added. Section 09: Decomposition Temperature was added. Section 09: Decomposition Temp - Header was added. Section 09: Vapor Pressure was added The information and recommendations contained herein are, to the best of ExxonMobil's knowledge and belief, accurate and reliable as of the date issued. You can contact ExxonMobil to insure that this document is the most current available from ExxonMobil. The information and recommendations are offered for the user's consideration and examination. It is the user's responsibility to satisfy itself that the product is suitable for the intended use. If buyer

71 Product Name: MOBIL SHC GREASE 102 EAL Revision Date: 21 Mar 11 Page 9 of 9 repackages this product, it is the user's responsibility to insure proper health, safety and other necessary information is included with and/or on the container. Appropriate warnings and safe-handling procedures should be provided to handlers and users. Alteration of this document is strictly prohibited. Except to the extent required by law, republication or retransmission of this document, in whole or in part, is not permitted. The term, "ExxonMobil" is used for convenience, and may include any one or more of ExxonMobil Chemical Company, Exxon Mobil Corporation, or any affiliates in which they directly or indirectly hold any interest Internal Use Only MHC: 0B, 0B, 0, 0, 0, 0 PPEC: A DGN: XUS ( ) Copyright 02 Exxon Mobil Corporation, All rights reserved

72 Lands- North Slave Region July th 18 Dominion Diamond Mine Koala Area Mining th St. SW Lease 76D/10-2 Calgary AB, X2P 1T1 Attn: April Hayward Superintendent, Environment Re: Underground Closure Request to leave biodegradable grease underground following closure Dear Ms. Hayward, This letter is in response to a request submitted by Dominion Diamond Mine on May 17 th 18, to leave biodegradable grease underground following closure. On May 17 th 18 Dominion Diamond submitted a proposal to replace all the grease used to service the underground crusher and conveyor system with a biodegradable alternative (Mobile SHC Grease 102 EAL). The intention is that with the approval of the Inspector, the grease can be left underground after closure rather than have to remove the bearings or flush them out. On July 17 th 18, the Inspector was accompanied by Dominion Diamond personnel during an inspection of the Panda/Koala underground workings. One of the purposes of this inspection was to become familiar with the location, size, volume and quantity of bearings that will be serviced with the biodegradable grease. Dominion Diamond personnel demonstrated the grease purging process to the Inspector, on one of the larger bearings attached to a sizer/crusher component. Dominion Diamond Mine will be purging the grease on all bearings initially and then service the bearings on a regular weekly schedule with the non-toxic biodegradable grease. The Inspector was informed that there are a total of 76 large bearings, and 22 smaller bearings located at the sizer/crusher on Level 1950, and along an additional six conveyors that run to the surface. The Inspector was also informed that all bearings will be physically tagged and a detailed log will be maintained on purging and greasing service intervals. Government of the Northwest Territories, 140 Bristol Avenue, Yellowknife, N.W.T. Canada X1A 3T2