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Diablo Canyon Units 1 and 2, Central PACIFIC GAS AND ELECTRIC COIVIPANY Report Number: GEO. DCPI>.TR.l4.01 GEOSCIENCES DEPARTlVH~ NT Report Revision: Rev. 0 TECHNICAL REPORT Report Date: 6/30/2014 Quality Related: Y Pagel of61 6ho /2-D2 l ~ PREPARED BY: /~ {'. , ~--·· DATE: ______f __ __1____ __ Lettis Consultants Stq~hen Thompson International, Inc. (LCI) Printed Name Organization VERIFIED BY: DATE: c. I'>? b-0/ t.j William Page PG&E Geosciences Department Printed Name Organization APPROVED BY: Printed Name Organization Page 2 of 61 GEO. DCPP.TR.14.01, Rev. 0 RECORD OF REVISIONS Rev. No. Reason for Revision Revision Date Initial Release. This work was defined and tracked under SAPN 0 6/30/2014 50470704. Page 3 of 61 GEO. DCPP.TR.14.01, Rev. 0 TABLE OF CONTENTS Page Signatories ........................................................................................................................ 1 Record of Revisions .......................................................................................................... 2 List of Tables, Figures, Plates, Appendices, and Attachments ......................................... 6 Abbreviations and Acronyms ............................................................................................ 8 1.0 INTRODUCTION .................................................................................................... 10 1.1 Purpose ......................................................................................................... 10 1.2 Intended Use of the Results .......................................................................... 10 1.3 Scope of Work ............................................................................................... 10 1.4 Project QA Program, Participating Organizations, and Responsibilities........ 11 2.0 ASSUMPTIONS ..................................................................................................... 12 3.0 DATA ...................................................................................................................... 13 3.1 Previously Collected Geologic and Geospatial Map Data ............................. 13 3.1.1 Previously Collected Geologic Map Data .......................................... 13 3.1.2 Previously Collected Geospatial Data ............................................... 16 3.2 Available Deep Well and Borehole Data ....................................................... 17 3.3 New Geologic Map Data ................................................................................ 18 4.0 METHODOLOGY ................................................................................................... 20 4.1 Preliminary Review and Identification of Priority Areas ................................. 20 4.2 Compilation of Previously Collected Geologic Data ...................................... 20 4.3 Field Mapping and Collection of New Data ................................................... 21 4.4 Integration of New Geologic Map Data with Previously Collected Data ........ 22 4.5 Analysis of the Geologic Data for Production of Geologic Maps ................... 24 4.5.1 Selection of Map Units and Symbols ................................................. 24 4.5.2 Selection of Map Scale and Extent .................................................... 25 5.0 SOFTWARE ........................................................................................................... 26 6.0 RESULTS ............................................................................................................... 27 6.1 Irish Hills Study Area ..................................................................................... 27 6.2 DCPP Study Area .......................................................................................... 27 6.3 Price Canyon Study Area .............................................................................. 28 6.4 Appendix A: Daily Field Reports .................................................................... 28 Page 4 of 61 GEO. DCPP.TR.14.01, Rev. 0 6.5 Appendix B: Field Photographs ..................................................................... 29 6.6 Appendix C: Field Samples ........................................................................... 29 6.7 Appendix D: GIS Files and Layers ................................................................ 29 6.8 Appendix E: Well Data Report ....................................................................... 29 7.0 ANALYSIS .............................................................................................................. 30 7.1 Nature and Quality of Geologic Mapping in the Study Area .......................... 30 7.2 Stratigraphy of the Study Area ...................................................................... 31 7.2.1 Franciscan Complex Rocks ............................................................... 31 7.2.2 Cretaceous Sandstone ...................................................................... 32 7.2.3 Morro Rock–Islay Hill Volcanic Intrusive Complex ............................ 32 7.2.4 Cambria Felsite .................................................................................. 32 7.2.5 Vaqueros Formation .......................................................................... 32 7.2.6 Rincon Formation .............................................................................. 33 7.2.7 Obispo Formation .............................................................................. 33 7.2.7.1 Volcaniclastic and Clastic Sub-units .................................... 34 7.2.7.2 Obispo Formation, Diabase Sub-unit ................................... 35 7.2.8 Monterey Formation ........................................................................... 35 7.2.9 Pismo Formation ................................................................................ 36 7.2.10 Quaternary Deposits .......................................................................... 37 7.3 Geologic Structure of the Study Areas .......................................................... 37 7.3.1 Folding ............................................................................................... 38 7.3.2 Faulting .............................................................................................. 39 7.3.2.1 Los Osos Fault Zone ........................................................... 40 7.3.2.2 Edna Fault Zone .................................................................. 46 7.3.2.3 San Miguelito Fault Zone ..................................................... 47 7.3.2.4 San Luis Bay Fault Zone ..................................................... 48 7.3.2.5 Shoreline Fault Zone ........................................................... 49 7.4 Changes to Previous Geologic Maps and Compilation Efforts ...................... 50 7.4.1 Northeastern Margin of the Pismo Syncline ...................................... 50 7.4.2 Southwest Limb of the Pismo Syncline, Monterey Formation/ Pismo Formation Contact ............................................................................. 51 7.4.3 Southwest Limb of the Pismo Syncline, Obispo Formation/ Monterey Formation Contact ............................................................................. 51 Page 5 of 61 GEO. DCPP.TR.14.01, Rev. 0 7.4.4 Franciscan Chert and Serpentinite, Los Osos Fault Zone ................. 52 7.4.5 Neogene Marine Deposits Within Western Los Osos Valley ............. 52 7.4.6 New Mapping Offshore of the DCPP ................................................. 53 8.0 CONCLUSIONS ..................................................................................................... 54 9.0 LIMITATIONS ......................................................................................................... 56 10.0 IMPACT EVALUATION .......................................................................................... 57 11.0 REFERENCES ....................................................................................................... 58 Page 6 of 61 GEO. DCPP.TR.14.01, Rev. 0 LISTS OF TABLES, FIGURES, PLATES, APPENDICES, AND ATTACHMENTS Tables Table 3-1 Sources of Previous Geologic Map Data Considered for the GMP Table 3-2 Sources of Previously Collected Geospatial Data Table 4-1 Guidelines for Describing Structural Measurement Uncertainty Figures Figure 1-1 Study Areas and Onshore Seismic-Reflection Data Coverage Figure 3-1 Locations of New Geologic Data Collection Sites Figure 3-2 Locations of Selected Wells Figure 3-3 Geologic Maps by C.A. Hall Considered in This Study Figure 3-4 Geologic Maps Developed for the LTSP Considered in This Study Figure 3-5 Map of the Los Osos Fault Zone by Lettis and Hall (1994) Considered in This Study Figure 3-6 Geologic Maps by T.W. Dibblee Considered in This Study Figure 3-7 Geologic Maps by M.O. Wiegers Considered in This Study Figure 3-8 Offshore Geologic Maps Developed for the Shoreline Fault Zone Report and Unpublished Onshore Map Data Collected in 2009 and 2010 by PG&E Figure 3-9 Geologic Map of the Price Canyon Study Area Figure 7-1 Locations of Significant Revisions to Existing Geologic Maps Figure 7-2 Comparison of (a) Revised and (b) Previous (AMEC, 2012a) Mapping, Northeastern Margin of the Pismo Syncline Figure 7-3 Comparison of (a) Revised and (b) Previous (AMEC, 2012a) Mapping, Pismo Fm./Monterey Fm.Contact Figure 7-4 Comparison of (a) Revised and (b) Previous (PG&E, 2011) Mapping, Monterey Fm./Obispo Fm. Contact Figure 7-5 Comparison of (a) Revised and (b) Previous (AMEC, 2012a) Mapping, Los Osos
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