2014-01-29_HYDROLOGY - P2009025 ‎(8)‎

• Permit No: P2009025
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/29/2014
• Doc Name: Baseline Hydrologic Monitoring Plan
• From: Black Range Minerals
• To: DRMS
• Email Name: TC1
• Media Type: D
• Archive: No

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