PERMFILE50679

• Permit No: C1980004A
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Section_Exhibit Name: APPENDICES K - P
• Media Type: D
• Archive: Yes

• Some of the mine inflow may be consumed underground during normal operations.
The quality of the mine water as presented in the Hydro-Geo report indicates it is of
bicarbonate, sulfate type with a relatively low concentration of total dissolved solids
(1,526 - 3,260 mg/I), and a pH of 8.2 - 8.95. The following table presents the impact
the mine water discharge would have on the total dissolved solids in East Salt Creek
above the McClave Canyon Mine (SW-1) at various flow rates:
However, during periods of downtime, all of the mine inflow will be pumped to the
surface and discharged into East Salt Creek. For the purposes of projecting the effect
mine discharge will have on East Salt Creek, it will be assumed the maximum mine flow
rate is 30 gpm or 0.07 cfs.

PHC East Salt 1994 & 1995 Creek SW-1
East Salt
Creek Flow
CFS TDS - Mg/I
SW-1 Mine Flow
cfs TDS - Mg/I
Mine TDS - mg/I
Combined % Increase
(Decrease)
1.4 3680 0.07 3260 3660 -0.00
2.4 3210 0.07 3260 3211 0.00
3 3620 0.07 3260 3612 -0.00
3.87 1750 0.07 3260 1777 0.01
4.1 2820 0.07 3260 2827 0.00
8.6 2460 0.07 3260 2466 0.00
8.95 1420 0.07 3260 1434 0.01

The quarterly data for SW-1 for the period 1994 and 1995 is sorted by ascending flow
rate. The impact is slightly greater as the flow rate in the creek increases. However,
the impact the mine water will have on East Salt Creek is minimal to non-existent.
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Appendix N
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