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Appendix F Geotechnical Report and Paleontological Resources Survey

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Appendix F Geotechnical Report and Paleontological Resources Survey D R AFT E NVI R ONME N T AL I MP A C T RE P OR T G ANAHL L UMBER P ROJECT January 2020 S AN J UAN C APISTRANO, C ALIFORNIA APPENDIX F GEOTECHNICAL REPORT AND PALEONTOLOGICAL RESOURCES SURVEY P:\JCA1803\CEQA\Administrative Draft EIR\Appendices\App F - Geotechnical_Paleo Resources.docx «11/20/19» G ANAHL L UMBER P ROJECT D R AFT E NVI R ONME N T AL I MP A C T RE P OR T S AN J UAN C APISTRANO, C ALIFORNIA January 2020 This page intentionally left blank P:\JCA1803\CEQA\Administrative Draft EIR\Appendices\App F - Geotechnical_Paleo Resources.docx «11/20/19» UPDATE GEOTECHNICAL INVESTIGATION REPORT AND RESPONSE TO THIRD PARTY REVIEW PROPOSED GANAHL LUMBER FACILITY DEVELOPEMENT SAN JUAN CAPISTRANO, CALIFORNIA PREPARED FOR GANAHL LUMBER COMPANY 1220 EAST BALL ROAD ANAHEIM, CALIFORNIA 92805 PREPARED BY WILLDAN ENGINEERING GEOTECHNICAL GROUP 1515 SOUTH SUNKIST STREET, SUITE E ANAHEIM, CALIFORNIA 92806 WILLDAN GEOTECHNICAL PROJECT NO. 108164-2000 NOVEMBER 15, 2018 November 15, 2018 Mr. Patrick Ganahl Ganahl Lumber Company 1200 East Ball Road Anaheim, CA 92805 Subject: Update Geotechnical Investigation Report and Response to Third Party Review Proposed Ganahl Lumber Facility Development, San Juan Capistrano, California Willdan Geotechnical Project No. 108164-2000 Dear Mr. Ganahl, Willdan Engineering, Geotechnical Group (Willdan Geotechnical) is pleased to present this report presenting our review of all available reports and plans, and reanalysis of available data from geotechnical viewpoint relevant to the proposed development and provide responses to review comments generated by the Third Party Reviewer of the City of San Juan Capistrano, as well as our conclusions and recommendations for the design and construction of the proposed developments. In preparation of this report we have reviewed all the readily available subsurface data, borings and cone penetration test (CPT) soundings relevant to the proposed project site, laboratory test results and analyses presented in the following referenced reports: 1. “Preliminary Geotechnical Investigation, Proposed Commercial Development and Ganahl Lumber Facility, Stonehill Drive and San Juan Creek Trail, San Juan Capistrano, California”, Prepared by G.A. Nicoll and Associates, Dated October 5, 2017 (Original), February 16, 2018 (Revision 1), and March 21, 2018 (Revision 2), Project 7082-04. 2. “Third Party Review of G. A. Nicoll and Associates, Inc., Preliminary Geotechnical Investigation, Proposed Commercial Development and Ganahl Lumber Facility, Stonehill Drive and San Juan Creek Trail, San Juan Capistrano, California”, Prepared by LGC Geotechnical, Inc., Dated June 22, 2018, Project No. 11126-01, City of SJC Project No. DA17-003. 3. “Conceptual Grading Plans, Ganahl Lumber, Stonehill Drive along the East Side of the San Juan Creek Channel, City of San Juan Capistrano, Sheet C-7 through C-20”, Prepared by Joseph C. Truxaw and Associates, Inc., Dated 6-1-18. 4. “Geotechnical Report, San Juan Creek (L01) Channel Levee Protection, Phases 4 & 5 (Station 51+00 to 112+00), San Juan Capistrano, California”, Prepared by AMEC Earth & Environmental, Inc., Dated June 24, 2010, Job No. 9-212-100147. Engineering | Geotechnical | Environmental | Sustainability | Financial | Homeland Security Phone: 714.634.3318 | Fax: 714.634.3372 | 1515 South Sunkist Street, Suite E, Anaheim, CA 92806 | www.willdan.com Update Geotechnical Investigation Report & Response to Third Party Review Proposed Ganahl Lumber Facility Development, San Juan Capistrano, California Willdan Geotechnical Project No. 108164-2000 November 15, 2018 5. “Design Level Analysis for Sheet Pile Wall, San Juan Creek (L01) – Phases 4 &5, East Levee Station 51+00 to Station 112+00, Orange County, CA”, Prepared by TETRA TECH, Dated March 25, 2016. Based on the results of our review of the aforementioned documents and engineering evaluation and analyses, the proposed developments are feasible from a geotechnical standpoint, provided the recommendations in this report are followed. We appreciate the opportunity to assist you and look forward to future projects. If you have any questions, please contact us. Respectfully submitted, WILLDAN ENGINEERING GEOTECHNICAL GROUP GINEERING EN G D MAN E OFESSIO IN TE O PR NA IE SH G L L F O D KHIA I F H E S B E T A G S A N R I N R O S E I G E R T T I N S C No. 2661 I E G E E No. 2202 R R * * ** Ross Khiabani, P.E., G.E. Afshin Mantegh, Ph.D., P.G., C.E.G. Senior Geotechnical Engineer Sr. Engineering Geologist Mohsen Rahimian, P.E., G.E. Principal Engineer Distribution: Addressee ii Update Geotechnical Investigation Report & Response to Third Party Review Proposed Ganahl Lumber Facility Development, San Juan Capistrano, California Willdan Geotechnical Project No. 108164-2000 November 15, 2018 TABLE OF CONTENTS SECTION PAGE 1. SITE DESCRIPTION ........................................................................................................... 1 2. PROPOSED DEVELOPMENT ............................................................................................ 1 3. GEOLOGY ............................................................................................................................ 1 4. SUBSURFACE CONDITIONS ............................................................................................ 2 5. GROUNDWATER ................................................................................................................ 3 6. SEISMIC CONSIDERATIONS ........................................................................................... 3 6.1. REGIONAL SEISMICITY .............................................................................................. 3 6.2. LOCAL FAULTING ........................................................................................................ 3 6.3. GROUND SHAKING AND SEISMIC DESIGN PARAMETERS ................................. 4 6.4. SOIL LIQUEFACTION ................................................................................................... 5 6.5. LANDSLIDE ................................................................................................................... 5 6.6. LATERAL SPREADING ................................................................................................. 5 7. CONCLUSIONS AND RECOMMENDATIONS ................................................................ 6 7.1. GENERAL ....................................................................................................................... 6 7.2. EARTHWORKS .............................................................................................................. 6 7.3. FILL MATERIAL ............................................................................................................ 6 7.4. UTILITY TRENCH BEDDING AND BACKFILL ........................................................ 7 7.5. TEMPORARY EXCAVATIONS ...................................................................................... 7 7.6. SHORING DESIGN ........................................................................................................ 8 7.7. FOUNDATION DESIGN ................................................................................................ 8 7.8. MOISTURE SENSITIVE FLOOR COVERING ............................................................ 9 7.9. CONCRETE FLATWORKS .......................................................................................... 10 7.10. RETAINING WALLS .................................................................................................... 10 7.11. SURFACE DRAINAGE ................................................................................................ 11 7.12. ON-SITE INFILTRATION ............................................................................................ 12 7.13. PAVEMENT DESIGN ................................................................................................... 12 7.14. SOIL CORROSIVITY ................................................................................................... 12 8. REFERENCES .................................................................................................................... 13 APPENDICES APPENDIX A. FIGURES APPENDIX B. BORING LOGS AND CPT DATA APPENDIX C. LIQUEFACTION ANALYSES iii Update Geotechnical Investigation Report & Response to Third Party Review Proposed Ganahl Lumber Facility Development, San Juan Capistrano, California Willdan Geotechnical Project No. 108164-2000 November 15, 2018 1. SITE DESCRIPTION The subject property is a rectangular shape, approximately 16-acre parcel, bounded by Stonehill Drive on the south, BNSF Railroad on the east, existing mobile home park on the north, and the San Juan Creek on the west. The San Juan Creek drainage extends in the southwesterly direction from the Santa Ana Mountains in the easterly portion of Orange County. The general area, historically has been a flood plain along the flow of the San Juan Creek. The site is presently fenced and used for the storage of dealer inventory of automobiles. The project site location is shown on Figure 1 in Appendix A. 2. PROPOSED DEVELOPMENT It is our understanding that the proposed development will consist of a total of four commercial/industrial building pads and relatively flat, paved and unpaved driveways, surface storage, and parking areas. The most recent conceptual plans show an elevated pad adjacent to Stonehill Drive using additional fill and a retaining wall. Structural loads were not available at the time of preparation of this
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