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-9 Summary of Surface Water Quality Data for 5 Quarters SW-4
Nondetect Sample
Analyte Units Minimum Maximum Average Count Count
Aluminum, dissolved mg/L 0.005 0.0182 0.011 2 5
Aluminum,total recoverable mg/L 0.0223 0.235 0.097 5
Arsenic, dissolved mg/L 0.0005 0.00091 0.0007 5
Arsenic,total recoverable mg/L 0.0007 0.0027 0.0016 5
Bicarbonate as CaCO3 mg/L 22.9 39.5 30.6 5
Cadmium, dissolved mg/L 0.000153 0.000528 0.000340 5
Calcium, dissolved mg/L 16.2 38.2 27.64 5
Carbon, dissolved organic mg/L 1 1.2 1 2 4
Carbonate as CaCO3 mg/L 2 2 2 5 5
Chloride mg/L 0.5 1.13 0.7 2 4
Copper, dissolved mg/L 0.0008 0.0017 0.0010 3 5
Fluoride mg/L 0.1 0.36 0.2 2 5
Hardness as CaCO3 (dissolved) mg/L 46 106 77 5
Hydroxide as CaCO3 mg/L 2 2 2 5 5
Iron, dissolved mg/L 0.007 0.0089 0.007 3 4
Iron,total recoverable mg/L 0.0246 0.235 0.115 5
Lead, dissolved mg/L 0.0002 0.00154 0.0006 5
Magnesium, dissolved mg/L 1.3 2.61 2.0 5
Manganese, dissolved mg/L 0.02 0.17 0.07 5
Mercury,total (low level) ng/L 0.3 14.4 3.9 1 5
Nitrate/Nitrite as N mg/L 0.1 0.476 0.3 5
Potassium, dissolved mg/L 0.2 0.63 0.4 5
Silver, dissolved mg/L 0.0001 0.0001 0.0001 5 5
Sodium, dissolved mg/L 1.1 3.5 2.3 5
Sulfate mg/L 30.1 76.4 50.8 5
Total Alkalinity mg/L 22.9 39.5 30.6 5
Total Dissolved Solids mg/L 64 162 113 5
Total Suspended Solids mg/L 5 5 5 4 5
Zinc, dissolved mg/L 0.093 0.233 0.14 5
pH (field) s.u. 6.72 8.18 7.56 5
Water Temperature (field) deg. C 1.2 10 6.5 5
ORP (field) mV 130 322.2 208 5
Conductivity(field) µS/cm 166 264 217 5
Disolved Oxygen (field) % 82.2 91.3 86.4 5
Flow (field) CFS 2.44 35.8 13.0 5