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8.0 Sites Reservoir Geology STATE OF CALIFORNIA The Resources Agency DEPARTMENT OF WATER RESOURCES DIVISION OF ENGINEERING GEOLOGIC FEASIBILITY REPORT SITES RESERVOIR PROJECT APPENDIX TO ENGINEERING FEASIBILITY REPORT PROJECT GEOLOGY REPORT No. 94-30-02 JULY 2003 Geologic Feasibility Report, Sites Reservoir Project Project Geology Report No. 94-30-02 State of California The Resources Agency DEPARTMENT OF WATER RESOURCES JULY 2003 DIVISION OF ENGINEERING Leslie F. Harder, Jr .......................................................................... Division Chief Ron Lee................................................................ Chief, Civil Engineering Branch Frank L. Glick ........................................................ Chief, Project Geology Section This report dated JULY 2003 was prepared in the Project Geology Section under the supervision of Frank L. Glick ................................................. Supervising Engineering Geologist by Ted Bruce ................................................................. Senior Engineering Geologist Bob Conover ........................................ Engineering Geologist, Range C (Retired) Farhad Nasirian ................................................... Engineering Geologist, Range C Tim Todd ............................................................. Engineering Geologist, Range C Jeff Van Gilder .................................................... Engineering Geologist, Range D Al Laguardia ......................... Water Resources Engineering Associate (Specialist) The vast majority of the field work and significant portions of the report were performed and/or written by DWR’s Northern District Geology Section as recognized on Page ii. The vast majority of the faulting and seismicity hazards investigation was performed by Jeff Unruh and staff at William Lettis and Associates. i Geologic Feasibility Report, Sites Reservoir Project Project Geology Report No. 94-30-02 State of California The Resources Agency DEPARTMENT OF WATER RESOURCES JULY 2003 DIVISION OF LOCAL ASSISTANCE Dwight Russell .................................................................. Chief, Northern District Glen Pearson ............................................ Chief, Resources Assessment Branch This report was prepared in the Northern District Geology Section under the supervision of Koll Buer............................................................................ Chief, Geology Section by Dave Forwalter ................................................... Engineering Geologist, Range D Kelly Staton ......................................................... Engineering Geologist, Range D with assistance from Northern District staff Jon Mulder .......................................................... Engineering Geologist, Range D Bruce Ross .......................................................... Engineering Geologist, Range D Glen Gordon ......................................................... Engineering Geologist, Range B Jennifer Weddle ................................................... Engineering Geologist, Range B Some of the organizational chart and position classifications shown here for the Division of Local Assistance are how they were when the report was prepared in May 2002. ii Geologic Feasibility Report, Sites Reservoir Project Project Geology Report No. 94-30-02 State of California The Resources Agency DEPARTMENT OF WATER RESOURCES DIVISION OF ENGINEERING GEOLOGIC FEASIBILITY REPORT SITES RESERVOIR PROJECT PROJECT GEOLOGY REPORT No. 94-30-02 JULY 2003 ENGINEERING GEOLOGY CERTIFICATION This report has been prepared under my direction as the professional geologist in direct responsible charge of the work, in accordance with the provisions of the Geologist Act of the State of California. Several portions of this report, such as the drill hole logs, geologic mapping and geologic sections were prepared in the Northern District. Those work activities and associated products were performed under the direction of licensed engineering geologists in their office. ________________________________ Frank L. Glick Chief, Project Geology Section Certified Engineering Geologist No. 1417 Date _____________________________ iii Geologic Feasibility Report, Sites Reservoir Project Project Geology Report No. 94-30-02 TABLE OF CONTENTS Page 1.0 EXECUTIVE SUMMARY ............................................................................. 1 2.0 INTRODUCTION .......................................................................................... 2 2.1 Purpose and Scope ......................................................................... 3 2.2 Project Description .......................................................................... 4 2.3 Project Chronology .......................................................................... 4 2.4 Previous Investigations and Reports ............................................... 6 3.0 REGIONAL GEOLOGY AND STRUCTURE ............................................... 7 3.1 General Geology and Structure ....................................................... 8 3.2 Coast Ranges and Great Valley Geomorphic Provinces ................. 9 3.3 Great Valley Sequence Rocks ....................................................... 10 3.4 Tertiary Sedimentary Deposits ...................................................... 12 3.5 Quaternary Deposits ...................................................................... 13 4.0 SITE EXPLORATION ................................................................................ 14 4.1 Geologic Mapping.......................................................................... 14 4.2 Drilling and Water Pressure Testing .............................................. 15 4.3 Seismic Refraction Surveys ........................................................... 16 4.4 Trenching and Test Pits ................................................................. 16 4.5 Laboratory Testing......................................................................... 17 5.0 GOLDEN GATE DAM SITE ....................................................................... 18 5.1 Site Geology .................................................................................. 18 5.1.1 Left Abutment ..................................................................... 19 5.1.2 Channel Area ...................................................................... 22 5.1.3 Right Abutment ................................................................... 23 5.2 Clearing and Stripping ................................................................... 25 5.3 Excavation Characteristics, Rock Strength, and Cutslopes ........... 25 5.3.1 Excavation Characteristics.................................................. 25 5.3.2 Rock Strength ..................................................................... 26 5.3.3 Cutslopes ............................................................................ 27 5.4 Water Pressure Testing, Grouting, and Foundation Treatment ..... 28 5.5 Groundwater and Springs .............................................................. 31 5.6 Pumping Plant and Approach Channel .......................................... 33 5.7 Inlet/Outlet Works Tunnel .............................................................. 35 5.8 Conclusions and Recommendations ............................................. 37 6.0 SITES DAM SITE ....................................................................................... 38 6.1 Site Geology .................................................................................. 38 6.1.1 Left Abutment ..................................................................... 39 6.1.2 Channel Area ...................................................................... 41 6.1.3 Right Abutment ................................................................... 43 6.2 Clearing and Stripping ................................................................... 46 6.3 Excavation Characteristics, Rock Strength, and Cutslopes ........... 47 iv Geologic Feasibility Report, Sites Reservoir Project Project Geology Report No. 94-30-02 TABLE OF CONTENTS Page 6.3.1 Excavation Characteristics.................................................. 47 6.3.2 Rock Strength ..................................................................... 48 6.3.3 Cutslopes ............................................................................ 48 6.4 Water Pressure Testing, Grouting, and Foundation Treatment ..... 50 6.5 Groundwater and Springs .............................................................. 52 6.5.1 Conclusions and Recommendations .................................. 53 7.0 SITES RESERVOIR SADDLE DAMS ........................................................ 54 7.1 General Geology and Structure ..................................................... 54 7.2 Saddle Dam #1 .............................................................................. 55 7.3 Saddle Dam #2 .............................................................................. 56 7.4 Saddle Dam #3 .............................................................................. 57 7.5 Saddle Dam #4 .............................................................................. 65 7.6 Saddle Dam #5 .............................................................................. 66 7.7 Saddle Dam #6 .............................................................................. 72 7.8 Saddle Dam #7 .............................................................................. 75
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