Upper San Joaquin River Basin Storage Investigation Temperance Flat Reservoir Surface Storage Option Technical Appendix to the Phase 1 Investigation Report A Joint Study by: Bureau of Reclamation California Department Mid-Pacific Region of Water Resources In Coordination with: The California Bay-Delta Authority October 2003 Upper San Joaquin River Basin Storage Investigation San Joaquin River looking downstream towards Millerton Lake Temperance Flat Reservoir Surface Storage Option Technical Appendix to the Phase 1 Investigation Report A Joint Study by: Bureau of Reclamation California Department Mid-Pacific Region of Water Resources In Coordination with: Prepared by: The California Bay-Delta Authority October 2003 Surface Water Storage Option Technical Memorandum TEMPERANCE FLAT RESERVOIR UPPER SAN JOAQUIN RIVER BASIN STORAGE INVESTIGATION TABLE OF CONTENTS Chapter Page ACRONYMS AND ABBREVIATIONS..................................................................... viii EXECUTIVE SUMMARY ...................................................................................... ES-1 CHAPTER 1. INTRODUCTION ............................................................................... 1-1 STORAGE OPTIONS SUMMARY.....................................................................................1-1 SUMMARY OF PREVIOUS INVESTIGATIONS................................................................1-4 POTENTIAL IMPROVEMENTS.........................................................................................1-4 RM 274 Options..............................................................................................................1-4 RM 279 Options..............................................................................................................1-5 RM 286 Options..............................................................................................................1-6 APPROACH AND METHODOLOGY.................................................................................1-7 Engineering and Geology...............................................................................................1-7 Cost Estimation ..............................................................................................................1-8 Hydropower Analysis......................................................................................................1-8 Environmental Review....................................................................................................1-9 CHAPTER 2. PHYSICAL SETTING ........................................................................ 2-1 TOPOGRAPHIC SETTING................................................................................................2-1 Available Topographic Mapping .....................................................................................2-1 Available Aerial Photography .........................................................................................2-1 GEOLOGIC AND SEISMIC SETTING...............................................................................2-1 Geotechnical Conditions.................................................................................................2-2 Seismic Hazard Analysis................................................................................................2-2 HYDROLOGIC SETTING ..................................................................................................2-2 Rainfall............................................................................................................................2-2 Runoff and Flood Data ...................................................................................................2-3 EXISTING FACILITIES......................................................................................................2-3 UPSTREAM HYDROPOWER FACILITIES .......................................................................2-5 PG&E Kerckhoff Hydroelectric Project ...........................................................................2-6 Kerckhoff No. 2 Powerhouse ......................................................................................2-7 Upper San Joaquin River Basin i October 2003 Storage Investigation Temperance Flat Reservoir Table of Contents Surface Water Storage Option Technical Appendix Kerckhoff Powerhouse ................................................................................................2-8 Kerckhoff Lake and Dam.............................................................................................2-8 Wishon Powerhouse ...................................................................................................2-9 SCE Big Creek Project ...................................................................................................2-9 Big Creek No. 4 Powerhouse......................................................................................2-9 Redinger Lake and Dam ...........................................................................................2-10 Big Creek No. 3 Powerhouse....................................................................................2-10 ENVIRONMENTAL SETTING .........................................................................................2-11 Botany ..........................................................................................................................2-11 Tree Anemone ..........................................................................................................2-12 Mariposa Pussypaws ................................................................................................2-13 Orange Lupine ..........................................................................................................2-13 Madera Linanthus .....................................................................................................2-13 Oval-Leaved Viburnum .............................................................................................2-13 Blue Elderberry .........................................................................................................2-13 Wildlife..........................................................................................................................2-14 Aquatic Biology and Water Quality...............................................................................2-14 Upper Millerton Lake .................................................................................................2-14 San Joaquin River – Millerton Lake to Kerckhoff Dam..............................................2-15 Kerckhoff Lake ..........................................................................................................2-16 San Joaquin River – Kerckhoff Lake to Redinger Dam.............................................2-17 Redinger Lake...........................................................................................................2-17 Recreation ....................................................................................................................2-17 Cultural Resources.......................................................................................................2-19 Archaeology ..............................................................................................................2-19 Ethnography..............................................................................................................2-20 History .......................................................................................................................2-21 Land Use ......................................................................................................................2-22 Mineral Resources........................................................................................................2-23 CHAPTER 3. STORAGE STRUCTURES AND APPURTENANT FEATURES....... 3-1 POTENTIAL DAM SITES CONSIDERED..........................................................................3-1 RM 274 ..............................................................................................................................3-1 Site Characteristics.........................................................................................................3-1 Potential Dam Types and Sizes .....................................................................................3-2 Concrete Arch Dam.....................................................................................................3-2 Concrete Gravity Dam.................................................................................................3-2 Concrete-Face Rockfill Dam .......................................................................................3-2 Preliminary Dam Sizes Evaluated...............................................................................3-3 Reservoir Area and Storage........................................................................................3-4 Appurtenant Features.....................................................................................................3-4 Diversion Works ..........................................................................................................3-5 Spillway .......................................................................................................................3-6 Outlet Works ...............................................................................................................3-6 Powerhouse ................................................................................................................3-7