2021-12-07_REVISION - M2012032 ‎(24)‎

• Permit No: M2012032
• IBM Index Class Name: Revision
• Doc Date: 12/7/2021
• Doc Name Note: Exhibit U: Designated Mining Operation Environmental Protection Plan
• Doc Name: Proposed Revision Materials
• From: Ouray Silver Mines, Inc
• To: DRMS
• Type & Sequence: AM2
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

Table U-6 Summary of Groundwater Data for Past 5 Quarters GW-313
Nondetect Sample
Analyte Units Minimum Maximum Average Count Count
Aluminum, dissolved mg/L 0.05 0.05 0.05 5 5
Antimony, dissolved mg/L 0.0004 0.00117 0.0007 1 5
Arsenic, dissolved mg/L 0.00021 0.00038 0.0003 1 5
Barium, dissolved mg/L 0.04 0.051 0.05 5
Beryllium, dissolved mg/L 0.00008 0.00008 0.00008 5 5
Bicarbonate as CaCO3 mg/L 25.9 44.6 32.2 5
Boron, dissolved mg/L 0.02 0.03 0.02 5 5
Cadmium, dissolved mg/L 0.00005 0.00009 0.00007 1 5
Calcium, dissolved mg/L 27 32.6 30.8 5
Carbonate as CaCO3 mg/L 2 2 2 5 5
Chloride mg/L 0.5 0.731 0.55 4 5
Chromium, dissolved mg/L 0.0005 0.0005 0.0005 5 5
Conductivity @25C PS/cm 174 216 197 5
Copper, dissolved mg/L 0.0008 0.0008 0.0008 5 5
Cyanide,total mg/L 0.003 0.003 0.0031 5 5
Fluoride mg/L 0.16 0.2 0.2 5
Hardness as CaCO3 (dissolved) mg/L 75 92 86 5
Hydroxide as CaCO3 mg/L 2 2 2 5 5
Iron, dissolved mg/L 0.06 0.06 0.06 5 5
Lead, dissolved mg/L 0.0001 0.00348 0.0009 1 5
Magnesium, dissolved mg/L 1.8 2.5 2.1 5
Manganese, dissolved mg/L 0.01 0.013 0.011 4 5
Mercury, dissolved mg/L 0.0002 0.0002 0.0002 5 5
Molybdenum, dissolved mg/L 0.00033 0.00098 0.00069 5
Nickel, dissolved mg/L 0.008 0.008 0.008 5 5
Nitrate/Nitrite as N mg/L 0.192 0.404 0.243 5
pH (lab) s.u. 7.1 7.9 7.5 5
Phosphorus,total mg/L 0.01 0.02 0.01 3 4
Potassium, dissolved mg/L 0.45 0.75 0.54 5
Total Dissolved Solids mg/L 126 136 130 5
Total Suspended Solids mg/L 5 5 5 4 5
Selenium, dissolved mg/L 0.00022 0.00042 0.0003 5
Silica, dissolved mg/L 5.2 6.3 5.6 5
Silver, dissolved mg/L 0.0001 0.0001 0.0001 5 5
Sodium, dissolved mg/L 2.1 2.53 2.27 5
Sulfate mg/L 43.7 66 59 5
Thallium, dissolved mg/L 0.0001 0.00014 0.0001 4 5
Total Alkalinity mg/L 25.9 44.6 32.2 5
Uranium, dissolved mg/L 0.0001 0.0001 0.0001 5 5
Vanadium, dissolved mg/L 0.01 0.01 0.01 5 5
Zinc, dissolved mg/L 0.02 0.125 0.08 1 5
pH (field) s.u. 6.57 8.49 7.12 5
Water Temperature (field) deg. C 4.2 8.9 6.3 5
ORP (field) mV 196 442.81 282 4
Conductivity(field) PS/cm 101 2701 198 4
Disolved Oxygen (field) % 44.3 70.91 56.1 3