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<br />CONTENTS (continued) <br />• <br />• <br />6.0 RECLAMATION ......................................................................................................... ......6-1 <br />6.1 WELL PLUGGING AND ABANDONMENT PROCEDURE ................... ......6-1 <br />6.2 WELL FIELD RECLAMATION ...................................................................... ......6-2 <br />6.3 SURFACE FACILITY RECLAMATION ....................................................... ......6-3 <br />6.4 ACCESS ROAD, UTILITY CORRIDOR, AND PIPELINE CORRIDOR <br /> RECLAMATION ............................................................................................... ...... 6-4 <br />6.5 REVEGETATION .............................................................................................. ......6-4 <br /> 6.5.1 Piceance Site .......................................................................................... ......6-4 <br /> 6.5.2 Pipeline Corridor ................................................................................. ...... 6-5 <br /> 6.5.3 Parachute Site ....................................................................................... ......6-6 <br />6.6 BEST MANAGEMENT PRACTICES ............................................................ ......6-6 <br />7.0 AFF ECTED ENVIRONMENT .................................................................................. ......7-1 <br />7.1 SITE CHARACTERISTICS .............................................................................. ......7-1 <br /> 7.1.1 Site Location ........................................................................................... ......7-1 <br /> 7.1.2 Topography and Elevation ................................................................. ......7-2 <br />7.2 GEOLOGY AND SOILS .................................................................................... ...... 7-2 <br /> 7.2.1 Regional Geology ................................................................................. ...... 7-2 <br /> 7.2.1.1 Stratigraphy ............................................................................... ...... 7-3 <br /> 7.2.1.2 Structural Geology ................................................................... ......7-8 <br /> 7.2.2 Project Geology ..................................................................................... ......7-8 <br /> 7.2.3 Nahcolite Resources ............................................................................ ....7-10 <br /> 7.2.4 Soils ......................................................................................................... ....7-12 <br />7.3 SURFACE WATER AND SURFACE DRAINAGES ................................. ....7-14 <br /> 7.3.1 Surface Water Hydrology ................................................................... ....7-14 <br /> 7.3.2 Surface Water Quality ......................................................................... ....7-16 <br /> 7.3.3 Surface Water Uses .............................................................................. ....7-17 <br /> 7.3.4 Discharges to Surface Waters ............................................................ ....7-17 <br />7.4 GROUNDWATER ............................................................................................. ...7-17 <br /> 7.4.1 Regional Groundwater ........................................................................ ... 7-17 <br /> 7,4.2 Aquifers and Confining Layers .......................................................... ... 7-18 <br /> 7.4.2.1 Alluvial Aquifers ...................................................................... ...7-18 <br /> 7.4.2.2 Upper Aquifer ............................................................................ ...7-19 <br /> 7.4.2.3 Mahogany Zone ......................................................................... ...7-20 <br /> 7.4.2.4 Lower Aquifer ............................................................................ ...7-20 <br /> 7.4.2.5 Saline Zone ................................................................................. ...7-21 <br /> 7.4.3 Springs and Wells ................................................................................. ...7-22 <br /> 7.4.4 Groundwater Quality ........................................................................... ...7-22 <br /> 7.4.4.1 Alluvial Aquifer ........................................................................ ...7-26 <br /> 7.4.4.2 Upper Aquifer ............................................................................ ... 7-26 <br /> 7.4.4.3 Lower Aquifer ............................................................................ ...7-27 <br />American Soda, L.L.P. <br />Commercial Mine Plan <br />August 18, 1998 <br />111 <br />