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' December 23, 1999 O • Page i <br />' American Soda, L.L.P. <br />Yankee Gulch Sodium Minerals Project <br />' GROUNDWATER, SURFACE WATER, AND <br />t PROCESS MONITORING PLAN FOR THE <br />YANKEE GULCH SODIUM MINERALS PROJECT <br />' Table of Contents <br />' Pace <br />1.0 INTRODUCTION .................................................................................................................... I <br /> 2.0 GROUNDWATER MONITORING .......................................................... .................................3 <br />' 2.1 Groundwater Monitoring Locations ....................................... .................................3 <br /> 2.1.1 Piceance Site Groundwater Monitoring Locations ..... .................................9 <br /> 2.1.2 Parachute Site Groundwater Monitoring Locations ... .................................9 <br />' 2.1.3 Local Domestic Well Locations .................................. .................................9 <br /> 2.2 Groundwater Monitoring Program ......................................... .................................9 <br />' 2.2.1 Water Level Monitoring ............................................. .................................9 <br /> 2.2.2 Groundwater Quality Monitoring ............................... ...............................10 <br /> 2.3 Piceance Site Groundwater Monitoring for Years 5-30 ......... ...............................15 <br />' 2.4 Post-Mining Groundwater Monitoring ................................... ...............................15 <br /> 3.0 SURF ACE WATER MONITORING LOCATIONS AND PROCESS ............ ...............................16 <br /> 3.1 Piceance Creek Monitoring ..................................................... ...............................16 <br /> 3.2 Pazachute Creek Monitoring ................................................... ...............................18 <br /> 3.3 Spring and Seep Monitoring-Piceance Site .......................... ...............................18 <br />' 3.4 Precipitation Monitoring-Piceance Site ............................... ...............................19 <br /> 3.5 Post-Mining Surface Water Monitoring ................................. ...............................19 <br />' 4.0 PROCESS MONITORING ...................................................................... ...............................20 <br /> 4.1 Solution Mining Wells ............................................................ ...............................20 <br /> 4.2 <br />4.3 Hazardous Waste Determination ............................................ <br />Solution and Cooling Ponds .................................................... ...............................21 <br />...............................22 <br /> 4.4 Pipeline Monitoring ................................................................ ...............................22 <br /> 5.0 QUALITY ASSURANCE/QUALITY CONTROL ...................................... ...............................24 <br /> 5.1 Groundwater Sampling Methods ............................................ ...............................24 <br />t 5.2 <br />5.3 Calibration Procedures and Frequency ................................... <br />Data Reduction, Validation, and Reporting ............................ ...............................24 <br />...............................25 <br /> 5.3.1 Data Reduction ............................................................ ...............................25 <br />' <br />5.4 5.3.2 Data Validation ........................................................... <br />Data Management ................................................................... ...............................25 <br />...............................25 <br /> 5.5 Internal Quality Control Checks ............................................. ...............................25 <br />' 5.5.1 Quality Control Checks-Field Activities .................. ...............................25 <br />' Agapito Associates, Inc. <br />