HYDRO29057

• Permit No: M1988112
• IBM Index Class Name: Hydrology
• Doc Name: TABLE OF CONTENTS
• Media Type: D
• Archive: No

BATTLE MOUNTA/N RESOURCES /NC./BATTLE MOUNTAIN GOLD COMPANY
SAN LUIS PROJECT
FAC/LITY NUMBER: CO-0045675, COST/LLA COUNTY
Appendix C
Comparison of Perini! Limitations, Antidegradation-Based LimilatiOn Determinations for the Surface Water
Rilo Seco Station Locations (RS-2 and RS-5), and Water Quality Standard-Based Limitation Determinations
Ou[fall OOIb, for average Flow values above 110 gpm up to 250 gpm (or 0.36 MGD)
Effluent Parameter DischarEe Limitations
Antidegradation Antidegradation Water Quality Standard
RS-5 Baseline RS-2 Baseline Based Calculation
Parameter 30-Day Ave/Daily Max 30-Day AvP/Daily Max 30-Da Av aily Max

Flow, MGD (gpm) 0.36 (250) /Report 0.36 (250) /Report 0.36 (250) /Report
Total Suspended Solids, mg/I 30 / 45 30 / 45 30 / 45
Oil and Grease, mg/I N/A / 10.0 N/A / 10.0 N/A / 10.0
pH, s.u. (min. -max.) N/A / 6.5 - 9.0 N/A / 6.5 - 9.0 N/A / 6.5 - 9.0
Potentially Dis. Alumium, mg/I 0.087 / 2.4 0.087 / 2.4 0.21 / 2.4
Total Arsenic, mg/I Report / 0.027 Report / 0.028 Report / 0.17
Pot. Dissolved Cadmium, mg/l 0.00053 / 0.020 0.00053 / 0.020 0.0032 / 0.020
Pot. Dissolved Copper, mg/I 0.0053 / 0.038 0.0071 / 0.038 0.033 / 0.038
Dissolved Iron, mg/I 0.30 /Report 0.68 /Report I.1 /Report
Total Recoverable Iron, mg/1 1.0 /Report 2.2 /Report 3.7 /Report
Pot. Dissolved Lead, mg/I 0.0015 / 0.15 0.0015 / 0.15 0.0071 / 0.15
Dissolved Manganese, mg/I 0.05 /Report 0.17 /Report 0.20 /Report
Total Recov. Manganese, mg/I 1.6 /Report 0.81/ Report 4.2 /Report
Total Mercury, mg/I Report /Report Report /Report Report /Report
(Calculated Values) - / 0.00001 - / 0.00001 -./ 0.00001
Total Radium 226+228, pCi/I N/A / 5.0 N/A / 5.0 N/A / 5.0
Total Selenium, mg/I 'Report / 0.0053 Report / 0.0053 Report / 0.0053
Pot. Dissolved Silver, mg/1 0.000030 / 0.0029 0.000030 / 0.0029 0.000030 / 0.0029
Total Natural Uranium, mg/I 0.92 / 4.9 0.92 / 4.9 3.9 / 4.9
Pot. Dissolved Zinc, mg/I 0.051 / 0.26 0.075 / 0.26 (0.30) / 0.26
Weak Acid Dis. Cyattide, mg/I Report /Report Report /Report Report /Report
(Calculated Values) - / 0.005 - % 0.005 - / 0.005
Total Fluoride, mg/I Report / 2.7 Report / 2.5 Report / 12.2
Total Sulfate, mg/I 283 /Report 172 /Report 1028 /Report
Whole Effluent Toxicity, Chronic N/A /Report N/A /Report N/A /Report