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AOZ Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Alexco Water&Environmental Inc. ACZ Sample ID: L50225-01 <br /> Project ID: Schwarzwalder Mine Date Sampled: 02/27/19 00:00 <br /> Sample ID: MW-19 Date Received: 02/28/19 <br /> Sample Matrix: Groundwater <br /> Wet Chemistry <br /> MethodParameter EPA Dilution Result Qual XQ Units MDLDate Analyst <br /> Alkalinity as CaCO3 SM2320B-Titration <br /> Bicarbonate as 1 209 mg/L 2 20 03/08/19 0:00 emk <br /> CaCO3 <br /> Carbonate as CaCO3 1 U mg/L 2 20 03/08/19 0.00 emk <br /> Hydroxide as CaCO3 1 U mg/L 2 20 03/08/19 0:00 emk <br /> Total Alkalinity 1 209 mg/L 2 20 03/08/19 0:00 emk <br /> Cation-Anion Balance Calculation <br /> Cation-Anion Balance -1.9 % 10/04/19 0.00 calc <br /> Sum of Anions 8.0 meq/L 10/04/19 0:00 calc <br /> Sum of Cations 7.7 meq/L 10/04/19 0:00 calc <br /> Chloride SM4500CI-E 1 7.3 mg/L 0.5 2 03/05/1913:02 wtc <br /> Cyanide,WAD SM4500-CN 1,E- 0.5 U mg/L 0.003 0.01 03/08/19 16:22 ttg <br /> Colorimetric w/distillation <br /> Fluoride SM450OF-C 1 0.47 mg/L 0.05 0.3 03/06/1913:44 emk <br /> Nitrate/Nitnte as N M353 2-H2SO4 preserved 1 089 mg/L 0.02 0.1 03/14/19 23:41 pjb <br /> Phosphate,total Calculation based on total U mg/L 0.06 0.2 10/04/19 0:00 calc <br /> Phosphorus <br /> Phosphors,total M365.1 -Auto Ascorbic 1 U mg/L 0.02 0.05 03/12/19 14:08 rbt <br /> Acid(digest) <br /> Residue,Filterable SM2540C 1 470 mg/L 10 20 03/01/19 14:24 emk <br /> (TDS)@180C <br /> Residue,Non- SM2540D 1 U mg/L 5 20 03/01/19 15:33 emk <br /> Filterable(TSS) <br /> @ 105C <br /> Sulfate D516-02/-07-Turbidimetric 5 173 mg/L 5 25 03/04/19 13:46 mss2 <br /> TDS(calculated) Calculation 449 mg/L 10/04/19 0 00 calc <br /> TDS(ratio- Calculation 1.05 10/04/19 0.00 calc <br /> measured/calculated) <br /> REPIN.02.06.05.01 *Please refer to Qualifier Reports for details <br /> L50225-1910040959 Page 4 of 33 <br />