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The water quality in the mines has been monitored since 1977 <br /> for the following perimeters; <br /> Flow MGD <br /> PH 6. 5 - 9. 0 <br /> T.D.S. 35. - 70. <br /> Iron 3. 5 - 7. 0 <br /> Oil-Grease 10 <br /> The following records are from 1977 to 1985 by mine number. <br /> Mine No. l (AActive) <br /> NPDES No. -004 <br /> Maximum Mean Minimum <br /> TDS 2640. 2234 1320. <br /> TSS 38. 16. <br /> 1. 6 <br /> Iron 1. 20 0. 34 <br /> 0. 01 <br /> pH 8. 0 8.16 7. 7 <br /> Oil/Grease 2. 4 0. 56 0 <br /> Mine No. 2 (Active) <br /> NPDES NO.-019 <br /> .Maximum Mean Minimum <br /> Conductivity 1350. 1137. 1000. <br /> TSS 10. 0 7. 2 4. 0 <br /> Iron 0. 58 0. 28 0.14 <br /> PH 8. 1 7. 92 7. 6 <br /> Oil/Grease 1. 0 1. 0 1. 0 <br /> 51 <br /> II <br />