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ENERGY „ Trust our People.Trust our Data. f Billings,MT 800 735.4489•Casper,WY 888.235.0515 <br /> `''� www.energylab.com ) Gillette,WY 866.686.7175•Helena.MT 877.412.0711 <br /> QA/QC Summary Report <br /> Prepared by Billings, MT Branch <br /> Client: Nederland Mining Consultants Work Order: B20021855 Report Date: 03/11/20 <br /> Analyte Count Result Units RL %REC Low Limit High Limit RPD RPDLimit Qual <br /> Method: A4500-S D Batch:R338347 <br /> Lab ID: MBLK 2 Method Blank Run:SPEC3_200304A 03/04/20 11:10 <br /> Sulfide ND mg/L 0.01 <br /> Sulfide as Hydrogen Sulfide(H2S) ND mg/L 0.01 <br /> Lab ID: LCS Laboratory Control Sample Run:SPEC3_200304A 03/04/20 11:10 <br /> Sulfide 0.227 mg/L 0.040 90 85 115 <br /> Lab ID: B20021855-001 EMS Sample Matrix Spike Run:SPEC3_200304A 03/04/20 11:10 <br /> Sulfide 0.200 mg/L 0.040 73 70 130 <br /> Lab ID: 820021855-001EMSD Sample Matrix Spike Duplicate Run:SPEC3_200304A 03/04/20 11:10 <br /> Sulfide 0.200 mg/L 0.040 73 70 130 0.0 20 <br /> Qualifiers: <br /> RL-Analyte Reporting Limit ND-Not detected at the Reporting Limit(RL) <br /> Page 7 of 13 <br />