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r x Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Ouray Silver Mines ACZ Sample ID: L66632-06 <br /> Project ID: Date Sampled: 06117121 10:15 <br /> Sample ID: GW-313 Date Received: 06118121 <br /> Sample Matrix: Groundwater <br /> Wet Chemistry <br /> Alkalinity as CaCO3 SM2320B-Titration <br /> Bicarbonate as 1 30.1 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 30.1 * rl 2 20 06/25/21 0:00 jck <br /> Cation-Anion Balance Calculation <br /> Cation-Anion Balance 0.0 % 07/14/21 0:00 talc <br /> Sum of Anions 1.9 meq/L 07/14/21 0:00 talc <br /> Sum of Cations 1.9 meq/L 07/14/21 0:00 talc <br /> Chloride SM4500CI-E 1 <0.5 U mg/L 0.5 2 07/12/2115:43 syw <br /> Conductivity @25C SM2510B 1 198 umhos/cm 1 10 06/25/21 0:30 jck <br /> Cyanide,total M335.4-Colorimelric w/distillation 0.5 <0.003 U * mg/L 0.003 0.01 07/01/21 17:06 syw <br /> Fluoride SM450OF-C 1 0.20 B mg/L 0.15 0.35 06/30/21 17:17 eep <br /> Hardness as CaCO3 SM2340B-Calculation 87 mg/L 0.2 5 07/14/21 0:00 talc <br /> (dissolved) <br /> Nitrate/Nitrite as N M353.2-H2SO4 preserved 1 0.404 mg/L 0.02 0.1 06/26/21 21:10 pjb <br /> pH(lab) SM4500H+6 <br /> pH 1 7.5 H units 0.1 0.1 06/25/21 0:00 jck <br /> pH measured at 1 20.3 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 06/30/21 0:00 pjb <br /> (digest) <br /> Residue,Filterable SM2540C 1 128 mg/L 20 40 06/24/21 16:03 eep <br /> (TDS)@180C <br /> Residue,Non- SM2540D 1 <5 U * mg/L 5 20 06/24/21 11:13 cgm <br /> Filterable(TSS) <br /> @ 105C <br /> Sulfate D516-02/-07/-11-TURBIDIMETRIC 5 60.7 * mg/L 5 25 07/13/21 13:23 wtc <br /> TDS(calculated) Calculation 123 mg/L 07/14/21 0:00 talc <br /> TDS(ratio- Calculation 1.04 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 13 of 36 <br />