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AOZ Laboratories, Inc. <br /> 2773 Downhill Drive Steamboat Springs, CO 80487(800)334-5493 i <br /> Rio Grande Silver, Inc. ACZ Sample ID: L26557-02 <br /> Project ID: BO-34028 Date Sampled: 09/09/15 10:35 <br /> Sample ID: W-B-ALT Date Received: 09110115 <br /> Sample Matrix: Surface Water <br /> Metals Analysis <br /> EPA-MethodParameter Dilution Result Quall e OIL Date Analyst <br /> Aluminum,dissolved M200.7 ICP 1 0.05 B mg/L 0.03 0.2 09/18/15 14:23 jjc <br /> Aluminum,total M200.7 ICP 1 0.13 B mg/L 0.03 0.2 09/15/15 11:33 jjc <br /> recoverable <br /> Arsenic,dissolved M200.8 ICP-MS 1 0.0011 mg/L 0.0002 0.001 09/21/15 17:15 mfm <br /> Arsenic,total M200.8 ICP-MS 1 0.0014 mg/L 0.0002 0.001 09/28/15 10:23 mfm <br /> recoverable <br /> Boron,dissolved M200.71CP 1 U mg/L 0.01 0.05 09/18/15 14:23 jjc <br /> Boron,total M200.71CP 1 U mg/L 0.01 0.05 09/15/15 11:33 jjc <br /> recoverable <br /> Cadmium,dissolved M200.8 ICP-MS 1 0.0095 mg/L 0.0001 0.0005 09/21/15 17:15 mfm <br /> Cadmium,total M200.8 ICP-MS 1 0.0098 mg/L 0.0001 0.0005 09/28/15 10:23 mfm <br /> recoverable <br /> Calcium,dissolved M200.7 ICP 1 16.4 mg/L 0.1 0.5 09/18/15 14:23 jjc <br /> Chromium,total M200.8 ICP-MS 1 U mg/L 0.0005 0.002 09/28/15 10:23 mfm <br /> recoverable <br /> Cobalt,dissolved M200.7 ICP 1 U mg/L 0.01 0.05 09/18/15 14:23 jjc <br /> Cobalt,total M200.71CP 1 U mg/L 0.01 0.05 09/15/15 11:33 jjc <br /> recoverable <br /> Copper,dissolved M200.8 ICP-MS 1 0.0035 mg/L 0.0005 0.003 09/21/15 17:15 mfm <br /> Copper,total M200.8 ICP-MS 1 0.0052 mg/L 0.0005 0.003 09/28/15 10:23 mfm <br /> recoverable <br /> Iron,dissolved M200.7 ICP 1 0.03 B mg/L 0.02 0.05 09/18/15 14:23 jjc <br /> Iron,total recoverable M200.7 ICP 1 0.19 mg/L 0.02 0.05 09/15/15 11:33 jjc <br /> Lead,dissolved M200.8 ICP-MS 1 0.0333 mg/L 0.0001 0.0005 09/21/15 17:15 mfm <br /> Lead,total recoverable M200.8 ICP-MS 1 0.0609 mg/L 0.0001 0.0005 09/28/15 10:23 mfm <br /> Magnesium,dissolved M200.7 ICP 1 1.7 mg/L 0.2 1 09/18/15 14:23 jjc <br /> Manganese,dissolved M200.7 ICP 1 0.400 mg/L 0.005 0.03 09/18/15 14:23 jjc <br /> Manganese,total M200.7 ICP 1 0.396 mg/L 0.005 0.03 09/15/15 11:33 jjc <br /> recoverable <br /> Mercury,total M1631,Atomic Fluorescence 1 1 * ng/L 0.2 0.5 09/25/15 11:09 scp <br /> Nickel,dissolved M200.71CP 1 U mg/L 0.008 0.04 09/18/15 14:23 jjc <br /> Nickel,total M200.71CP 1 U mg/L 0.008 0.04 09/15/15 11:33 jjc <br /> recoverable <br /> Potassium,dissolved M200.71CP 1 1.1 mg/L 0.2 1 09/18/15 14:23 jjc <br /> Selenium,dissolved M200.8 ICP-MS 1 U mg/L 0.0001 0.0003 09/21/15 17:15 mfm <br /> Selenium,total M200.8 ICP-MS 1 U mg/L 0.0001 0.0003 09/28/15 10:23 mfm <br /> recoverable <br /> Silica,dissolved M200.7 ICP 1 20.7 mg/L 0.2 1 09/18/15 14:23 jjc <br /> Silica,total recoverable M200.7 ICP 1 20.3 * mg/L 0.2 1 09/15/15 11:33 jjc <br /> Silver,dissolved M200.8 ICP-MS 1 U mg/L 0.00005 0.0003 09/21/15 17:15 mfm <br /> Silver,total recoverable M200.8 ICP-MS 1 U mg/L 0.00005 0.0003 09/28/15 10:23 mfm <br /> Sodium,dissolved M200.7 ICP 1 4.8 mg/L 0.2 1 09/18/15 14:23 jjc <br /> Uranium,dissolved M200.8 ICP-MS 1 0.0001 B mg/L 0.0001 0.0005 09/21/15 17:15 mfm <br /> Uranium,total M200.8 ICP-MS 1 0.0001 B mg/L 0.0001 0.0005 09/28/15 10:23 mfm <br /> recoverable <br /> Zinc,dissolved M200.8 ICP-MS 5 2.17 mg/L 0.01 0.03 09/22/15 21:17 mfm <br /> REPIN.02.06.05.01 *Please refer to Qualifier Reports for details. <br /> L26557-1510011525 Page 7 of 48 <br />