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Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Ouray Silver Mines ACZ Sample ID: L66632-04 <br /> Project ID: Date Sampled: 06117121 11:15 <br /> Sample ID: GW-2A Date Received: 06118121 <br /> Sample Matrix: Groundwater <br /> Wet Chemistry <br /> Alkalinity as CaCO3 SM2320B-Titration <br /> Bicarbonate as 1 26.0 mg/L 2 20 06/25/21 0:00 jck <br /> CaCO3 <br /> Carbonate as CaCO3 1 <2 U mg/L 2 20 06/25/21 0:00 jck <br /> Hydroxide as CaCO3 1 <2 U mg/L 2 20 06/25/21 0:00 jck <br /> Total Alkalinity 1 26.0 * mg/L 2 20 06/25/21 0:00 jck <br /> Cation-Anion Balance Calculation <br /> Cation-Anion Balance 3.4 % 07/14/21 0:00 calc <br /> Sum of Anions 1.4 meq/L 07/14/21 0:00 calc <br /> Sum of Cations 1.5 meq/L 07/14/21 0:00 calc <br /> Chloride SM4500CI-E 1 <0.5 U mg/L 0.5 2 07/12/2115:41 syw <br /> Conductivity @25C SM2510B 1 161 * umhos/cm 1 10 06/25/21 0:14 jck <br /> Cyanide,total M335.4-Colorimetric w/distillation 0.5 <0.003 U mg/L 0.003 0.01 07/01/21 17:03 syw <br /> Fluoride SM450OF-C 1 0.25 B mg/L 0.15 0.35 06/30/2116:50 eep <br /> Hardness as CaCO3 SM2340B-Calculation 68.0 mg/L 0.2 5 07/14/21 0:00 calc <br /> (dissolved) <br /> Nitrate/Nitrite as N M353.2-H2SO4 preserved 1 0.588 mg/L 0.02 0.1 06/26/21 21:07 pjb <br /> pH(lab) SM4500H+B <br /> pH 1 7.5 H units 0.1 0.1 06/25/21 0:00 jck <br /> pH measured at 1 20.1 C 0.1 0.1 06/25/21 0:00 jck <br /> Phosphorus,total M365.1-Auto Ascorbic Acid 1 <0.01 U * mg/L 0.01 0.05 06/29/21 23:56 pjb <br /> (digest) <br /> Residue,Filterable SM2540C 1 100 mg/L 20 40 06/24/21 14:07 jck <br /> (TDS)@180C <br /> Residue,Non- SM2540D 1 32.0 * mg/L 5 20 06/24/21 11:08 cgm <br /> Filterable(TSS) <br /> @ 105C <br /> Sulfate D516-02/-07/-11-TURBIDIMETRIC 5 42.8 mg/L 5 25 07/13/21 13:22 wtC <br /> TDS(calculated) Calculation 93.9 mg/L 07/14/21 0:00 calc <br /> TDS(ratio- Calculation 1.06 07/14/21 0:00 talc <br /> measured/calculated) <br /> REPIN.02.06.05.01 •Please refer to Qualifier Reports for details. <br /> L66632-2107141355 Page 9 of 36 <br />