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AOZ Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Rio Grande Silver, Inc. ACZ Sample ID: L26556-03 <br /> Project ID: BO-34028 Date Sampled: 09/09/15 08:40 <br /> Sample ID: DP-3 Date Received: 09110115 <br /> Sample Matrix: Ground Water <br /> Wet Chemistry <br /> Parameter EPA Method Dilution Result Qua[ XQ Units MDL POL Date <br /> Chloride M300.0-Ion Chromatography 1 1.38 B mg/L 0.5 2.5 09/21/1515:54 bsu <br /> Fluoride SM450OF-C 1 0.13 B * mg/L 0.05 0.3 09/21/1511:56 enb <br /> Hardness as CaCO3 SM2340B-Calculation 98 mg/L 0.8 4 10/07/15 11:46 talc <br /> (dissolved) <br /> Nitrate as N,dissolved Calculation: N031\102 minus NO2 U mg/L 0.02 0.1 10/07/15 11:46 talc <br /> Nitrate/Nitrite as N, M353.2-Automated 1 U mg/L 0.02 0.1 09/10/15 19:30 pjb <br /> dissolved Cadmium Reduction <br /> Nitrite as N,dissolved M353.2-Automated 1 U mg/L 0.01 0.05 09/10/15 19:30 pjb <br /> Cadmium Reduction <br /> pH(lab) SM4500H+B <br /> pH 1 6.9 H units 0.1 0.1 09/17/15 0:00 enb <br /> pH measured at 1 18.9 C 0.1 0.1 09/17/15 0:00 enb <br /> Residue,Filterable SM2540C 1 188 mg/L 10 20 09/11/15 13:24 sck <br /> (TDS)@180C <br /> Sulfate M300.0-Ion Chromatography 5 157 mg/L 2.5 12.5 09/22/15 5:05 bsu <br /> Sulfide as S SM450oS2-D 1 0.09 B mg/L 0.02 0.1 09/15/15 9:11 tms <br /> TDS(calculated) Calculation 247 mg/L 10/07/15 11:46 talc <br /> TDS(ratio- Calculation 0.76 10/07/15 11:46 talc <br /> measured/calculated) <br /> REPIN.02.06.05.01 *Please refer to Qualifier Reports for details. <br /> L26556-1510071448 Page 7 of 37 <br />