HYDRO27678

• Permit No: M1974015
• IBM Index Class Name: Hydrology
• Doc Name: AN ANALYSIS OF POSSIBLE GROUNDWATER & SURFACE WATER IMPACTS RESULTING FROM LYONS ROCKIN WP GRAVEL P
• Media Type: D
• Archive: No

TABLE OF CONTENTS
' Title Page
' CHAPTER 1 INTRODUCTION ................................................. 1
1. l Overview
1.2 The Mining Operation ..................................... ........ 1
' 1.3 Purpose and Scope of Study ......................................... 3
' CHAPTER 2 EXECUTIVE SUMMARY .......................................... 5
' 2.1 Changes in Ground Water Levels and Possible Impacts to Nearby Wells ...... 5
' 2.2 Impacts to the Alluvial Aquifer -Stream System Relationship ............... 6
' CHAPTER 3 MINING PLAN ................................................... 7
' CHAPTER 4 CHANGES IN GROUND WATER LEVELS AND POSSIBLE IA4PACTS TO
NEARBY WELLS ............................................... .. 8

4.1 Review of Well Records and Yields ................................. .. 8
4.2 Well Drilling and Pump Testing Program ............................. . 11
4.3 Ground Water Model Concept ...................................... . 13
' 4.4 Model Calibration ....................................... ....... . 16
4.5 Pre-Mining Simulation .................................... ....... . 16
' 4.6 Model Results .................................................. .16
4.6.1 Ground Water Level Changes During Mining .................... . 17
' 4.6.2 Ground Water Level Changes After Mining ..................... . 20
4.7 Well Yields from Potentially Impacted Wells .......................... . 20

I

1 /inhn~ l;/„cil u I ~<m iu/cr, lni.