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f-" o Water Occurrence and Salinity CD o The nature and occurrence of ground water at the La Plata Mine is comprehens:i;vely described in the Permit Application Package (Permit No. 24-9P) for the mine. Periodic monitoring of ground and surfac~ waters are conducted and reported to the New Mexico Mining and Minerals Division in compliance with permit requirements. Records of water quality (electrical conductivity and total ~issolved solids) are tabulated in APPENDIX B. Concentrations of salinity are indicated in these tables for alluvial, Fruitland, and pictured Cliffs Formation ground water, and for ponds and storm runoff. Based on an historic record of water qualiity monitoring data at the La Plata Mine (APPENDIX B), average salinity (total dissolved solids) concentrations are outlined b~ow for water sources. Source Salinity mq/l Fruitland Formation pictured Cliffs Formation La Plata Valley Alluvium Disturbed Area Runoff Ponds Coal Stockp~le Runoff Ponds Surface Water Runoff 1585 2084 1235 394 311 568 Waters of discharge potential at the La Plata Mine are outlined in PART III of NPDES Permit No. NM0029505 for the mine, Thirty eight outfalls are indicated for the mine. Outfalls 025 and 028 comprise impounded waters from coal pile runoff, with an average salinity concentration of 311 mg/l. The remaining 36 outfalls are associated with drainage of storm runoff from other disturbed mine areas. This runoff ranges in salinity concentration from 108 mg/l to 1530 mg/l and averages 394 mg/l, The runoff flows either to the mine pits or to runoff ponds. Runoff flowing to 5 , , ,;;2", ,~' . ' ':>{,.' '\ ! '\ 1 1 'j , 'i 1 1 1