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Baseline Hydrologic Monitoring Plan — Hansen Project i <br />TABLE OF CONTENTS <br />1. INTRODUCTION ..................................................................................................... ............................... 1 <br />1.1 Location, Access, and Study Areas ........................................................ ............................... 1 <br />1.2 Mining History ....................................................................................... ............................... 3 <br />1.3 Previous Investigations ........................................................................... ............................... 3 <br />1.4 Monitoring Program Goals and Objectives ............................................ ............................... 4 <br />2. SITE DESCRIPTION ................................................................................................ ............................... 5 <br />2.1 Climatology ............................................................................................. ..............................5 <br />2.1.1 Meteorological Stations ............................................................. ............................... 5 <br />2.1.2 PRISM Spatial Climate Data Sets ............................................. ............................... 6 <br />2.1.3 Precipitation Best Engineering Estimate ................................... ............................... 6 <br />2.2 Surface Water Hydrology ....................................................................... ............................... 9 <br />2.2.1 Watershed Delineation .............................................................. ............................... 9 <br />2.2.2 Description of Streams ............................................................ ............................... 11 <br />2.2.2.1 Cottonwood Creek ...................................................... ............................... 11 <br />2.2.2.2 Squaw Creek .............................................................. ............................... 11 <br />2.2.2.3 Salt Creek ................................................................... ............................... 12 <br />2.2.2.4 North Tallahassee Creek ............................................ ............................... 12 <br />2.2.2.5 Middle Tallahassee Creek .......................................... ............................... 12 <br />2.2.2.6 Hall Gulch .................................................................. ............................... 13 <br />2.2.2.7 Fear Creek .................................................................. ............................... 13 <br />2.2.3 Surface Water Quality ............................................................. ............................... 14 <br />2.2.4 Total Maximum Daily Load (TMDL) Assessment ................. ............................... 15 <br />2.3 Hydrogeology ......................................................................................... .............................17 <br />2.3.1 Geologic Setting ...................................................................... ............................... 17 <br />2.3.2 Ore Deposits ............................................................................ ............................... 18 <br />2.3.3 Hydrostratigraphy ...................................................................... .............................21 <br />2.3.4 Groundwater Flow ................................................................... ............................... 21 <br />2.3.5 Seeps and Springs .................................................................... ............................... 21 <br />3. SURFACE WATER MONITORING ...................................................................... ............................... 23 <br />3.1 Monitoring Network ............................................................................. ............................... 23 <br />3.1.1 North Tallahassee Creek ......................................................... ............................... 24 <br />3.1.2 Middle Tallahassee Creek and its Tributaries ......................... ............................... 25 <br />3.1.3 Cottonwood Creek and its Tributaries ..................................... ............................... 25 <br />3.1.4 Additional Surface Water Stations .......................................... ............................... 25 <br />3.2 Monitoring Frequency and Duration .................................................... ............................... 27 <br />3.3 Surface Water Monitoring Procedures ................................................. ............................... 27 <br />3.4 Analytical Suite .................................................................................... ............................... 27 <br />3.4.1 Field Parameters ...................................................................... ............................... 28 <br />3.4.2 Laboratory Analytical Suite .................................................... ............................... 28 <br />3.4.3 Progressive Radiochemistry Screening ................................... ............................... 30 <br />3.4.4 Regulatory Basis for Surface Water Analytical Suite ............. ............................... 30 <br />4153A.140129 Whetstone Associates <br />