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A OZ Laboratories, Inc. ' <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Ouray Silver Mines ACZ Sample ID: L73467-02 <br /> Project ID: Date Sampled: 05/25/22 09:42 <br /> Sample ID: GW-1A Date Received: 05126122 <br /> Sample Matrix: Groundwater <br /> Wet Chemistry <br /> • Units MDLDate Analpt <br /> Alkalinity as CaCO3 SM2320B-Titration <br /> Bicarbonate as 1 43.4 mg/L 2 20 06/01/22 0.00 jck <br /> CaCO3 <br /> Carbonate as CaCC3 1 <2 U mg/L 2 20 06/01/22 0:00 jck <br /> Hydroxide as CaCO3 1 <2 U mg/L 2 20 06/01/22 0:00 jck <br /> Total Alkalinity 1 43.4 mg/L 2 20 06/01/22 0:00 jck <br /> Cation-Anion Balance Calculation <br /> Cation-Anion Balance -3.0 % 07/15/22 0:00 calc <br /> Sum of Anions 1.7 meq/L 07/15/22 0.00 calc <br /> Sum of Cations 1.6 meq/L 07/15/22 0:00 calc <br /> Chloride SM4500CI-E 1 0.73 B * mg/L 0.5 2 05/31/2216:30 bls <br /> Conductivity @25C SM2510B 1 178 umhos/cm 1 10 06/01/22 3:08 jck <br /> Cyanide,total M3354-Colonmetricw/distillation 05 <0.003 UH mg/L 0.003 0.01 07/12/2214:51 mrd <br /> Fluoride SM450OF-C 1 019 B mg/L 0.15 0.35 06/06/2217:22 emk <br /> Hardness as CaCO3 SM2340B-Calculation 75 mg/L 0.2 5 07/15/22 0:00 calc <br /> (dissolved) <br /> Nitrate/Nitrite as N M353 2-H2SO4 preserved 1 1.06 * mg/L 0.02 0.1 06/04/22 22:33 plb <br /> pH(lab) SM4500H+B <br /> pH 1 7.9 H units 0.1 0.1 06/01/22 0 00 jck <br /> pH measured at 1 21.4 C 0.1 0.1 06/01/22 0:00 jck <br /> Phosphorus,total M365 1-Auto Ascorbic Acid 1 <0 01 U mg/L 0.01 0.05 06/10/22 2:40 pjb <br /> Residue, Filterable SM2540C 1 118 mg/L 20 40 05/31/22 15.16 emk <br /> (TDS)@180C <br /> Residue, Non- SM2540D 1 <5 U * mg/L 5 20 06/01/22 13:43 anc <br /> Filterable(TSS) <br /> @105C <br /> Sulfate D516-02/-07/-11-TURBIDIMETRIC 1 38.5 mg/L 1 5 05/29/22 11:50 mll1 <br /> TDS(calculated) Calculation 104 mg/L 07/15/22 0:00 calc <br /> TDS(ratio- Calculation 1 13 07/15/22 0:00 calc <br /> measured/calculated) <br /> REPIN.02.06.05.01 'Please refer to Qualifier Reports for details. <br /> L73467-2207151358 Page 6 of 25 <br />