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AraZ Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 <br /> Rio Grande Silver, Inc. ACZ Sample ID: L26556-02 <br /> Project ID: BO-34028 Date Sampled: 09109115 08:55 <br /> Sample ID: GW-1 Date Received: 09110115 <br /> Sample Matrix: Ground Water <br /> Wet Chemistry <br /> to <br /> Parameter EPA Method DIM' n lWiijit-------- Qual XQ Units---- MDL PQL-------D --- <br /> Alkalinity as CaCO3 SM2320B-Titration <br /> Bicarbonate as 1 27.4 mg/L 2 20 09/17/15 0:00 enb <br /> CaCO3 <br /> Carbonate as CaCO3 1 U mg/L 2 20 09/17/15 0:00 enb <br /> Hydroxide as CaCO3 1 U mg/L 2 20 09/17/15 0:00 enb <br /> Total Alkalinity 1 27.4 * mg/L 2 20 09/17/15 0:00 enb <br /> Cation-Anion Balance Calculation <br /> Cation-Anion Balance 0.0 % 10/07/15 11:46 talc <br /> Sum of Anions 3 meq/L 10/07/15 11:46 talc <br /> Sum of Cations 3.0 meq/L 10/07/15 11:46 talc <br /> Chloride M300.0-Ion Chromatography 1 1.17 B * mg/L 0.5 2.5 09/21/1515:36 bsu <br /> Fluoride SM450OF-C 1 0.23 B mg/L 0.05 0.3 09/21/1511:52 enb <br /> Hardness as CaCO3 SM23406-Calculation 131 mg/L 0.8 4 10/07/15 11:46 talc <br /> (dissolved) <br /> Nitrate as N,dissolved Calculation: NO3NO2 minus NO2 0.14 mg/L 0.02 0.1 10/07/15 11:46 talc <br /> Nitrate/Nitrite as N, M353.2-Automated 1 0.14 mg/L 0.02 0.1 09/10/15 19:29 pjb <br /> dissolved Cadmium Reduction <br /> Nitrite as N,dissolved M353.2-Automated 1 U mg/L 0.01 0.05 09/10/15 19:29 pjb <br /> Cadmium Reduction <br /> Nitrogen,ammonia M350.1 1 U mg/L 0.05 0.2 09/21/15 11:37 bsu <br /> Nitrogen,organic M351.2&M350.1-TKN minus NH3 0.1 B mg/L 0.1 0.5 10/07/15 11:46 talc <br /> Nitrogen,total Kjeldahl M351.2-TKN by Block Digester 1 0.1 B mg/L 0.1 0.5 09/19/15 14:25 pjb <br /> pH(lab) sM4500H+B <br /> pH 1 7.1 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 1 268 mg/L 10 20 09/11/15 13:22 sck <br /> (TDS)@180C <br /> Sulfate M300.0-Ion Chromatography 5 112 mg/L 2.5 12.5 09/22/154:47 bsu <br /> Sulfide as S SM450os2-D 1 U mg/L 0.02 0.1 09/15/15 9:03 tms <br /> TDS(calculated) Calculation 191 mg/L 10/07/15 11:46 talc <br /> TDS(ratio- Calculation 1.40 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 5 of 37 <br />