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Environmental Assessment for the Cahuilla Indian Health Clinic Replacement Project Volume Ii: Technical Appendices

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Environmental Assessment for the Cahuilla Indian Health Clinic Replacement Project Volume Ii: Technical Appendices W ^_^_ ENVIRONMENTAL ASSESSMENT FOR THE CAHUILLA INDIAN HEALTH CLINIC REPLACEMENT PROJECT VOLUME II: TECHNICAL APPENDICES November 2020 Prepared for: Prepared by: Bureau of Indian Affairs BRG Consulting, Inc. Pacific Region Office This page intentionally left blank. ENVIRONMENTAL ASSESSMENT VOLUME II: TECHNNICAL APPENDICES CAHUILLA INDIAN HEALTH CLINIC REPLACEMENT PROJECT ANZA, CALIFORNIA U.S. DEPARTMENT OF THE INTERIOR BUREAU OF INDIAN AFFAIRS PACIFIC REGION OFFICE 2800 Cottage Way Sacramento, CA 95825 Telephone: (916) 978-6000 November 2020 This page intentionally left blank. U.S. Dept. of the Interior Cahuilla Indian Health Clinic Replacement Project Bureau of Indian Affairs Environmental Assessment VOLUME II: APPENDICES TO THE ENVIRONMENTAL ASSESSMENT Appendix A Geotechnical Investigation Prepared by Sladden Engineering, November 7, 2018 Appendix B Air Quality Report Prepared by Birdseye Planning Group, May 2019 Appendix C Biological Resources Letter Report Prepared by Merkel & Associates, October 7, 2019 Appendix D Farmland Conversion Impact Rating Form (Form AD-1006) Prepared by BRG Consulting, Inc., February 2020. Appendix E Cultural Resources Report and Section 106 Consultation E-1 Cultural Resources Report, prepared by Cogstone August 2019 E-2 THPO Consultation and Request For Concurrence, August 4, 2020 E-3 THPO Concurrence, dated August 11, 2020 E-4 Cahuilla Tribe Correspondence, June 28, 2019 Appendix F Figures Appendix G References BRG Consulting, Inc. i November 2020 U.S. Dept. of the Interior Cahuilla Indian Health Clinic Replacement Project Bureau of Indian Affairs Environmental Assessment This page intentionally left blank. BRG Consulting, Inc. ii November 2020 Geotechnical A Investigation This page intentionally left blank. GEOTECHNICAL INVESTIGATION PROPOSED CAHUIILLA HEALTH CENTER APN 572·190·004 CAHUILLA ROAD ANZAAREA RIVERSIDE COUNTY, CALIFORNIA · Prepared By· Sladden Engineering 45090 Golf Center Parkway, Suite F Indio, California 92201 (760) 772·3893\ Stadden Engineering www.SladdenEngineering.com Sladden Engineering 45090 Golf Center Parkway, Suite F, Indio, California 92201 (760) 863-0713 Fax (760) 863-0847 6782 Stanton Avenue, Suite C, Buena Park, CA 90621 (714) 523-0952 Fax (714) 523-1369 450 Egan Avenue, Beaumont, CA 92223 (951) 845-7743 Fax (951) 845-8863 800 E. Florida Avenue, Heme t, CA 92543 (951) 766-8777 Fax (951) 766-8778 November 7, 2018 Project No. 544--18356 18-11-538 Herron & Rumansoff Architects, Inc. 530 Saint John Place Hemet, California 92543 Subject: Geotechnical Investigation Project: Proposed Cahuilla Health Center APN 572-190-004 Cahuilla Road AnzaArea River side County, California Sladden Engineering is pleased to present the results of the geotechnical investigation performed for the Cahuilla Health Center proposed for the subject site located on the south side of Cahuilla Road in the Anza area of Riverside County, California. Our services were completed in accordance with our revised proposal for geotechnica l engineering services dated December 2, 2017 and your authorization to proceed with the work. The purpo se of our investigation was to explore the subsurface conditions at the site in order to provide recommendations for foundation design and site preparation . Evaluation of environmental issues and hazardous wastes was not included within the scope of service s provid ed . The opinions, recommendation s and design criteria presented in this report are based on our field exploration program, labor atory testing and engineering analyses. Based on the results of our investigation, it is our professional opinion that the proposed project should be feasible from a geotechnical perspective pro vided that the recommendations presented in this report are implemented in design and carried out through construction. We appreciate the opportunity to provide service to you on this project. If you have any questions regarding this report, please contact the und ersigned. Principal Geologist SER/me Cop ies: 4/Addressee Sladden Engineering www.SladdenEngineering.com GEOTECHNICAL INVESTIGATION PROPOSED CAHUIILLA HEALTH CENTER APN 572-190-004 CAHUILLA ROAD ANZAAREA RIVERSIDE COUNTY, CALIFORNIA November 7, 2018 TABLE OF CONTENTS INTRODUCTION .................................................................................................................................... 1 PROJECT DESCRIPTION ....................................................................................................................... 1 SCOPE OF SERVICES ............................................................................................................................. 2 SITE CONDITIONS ................................................................................................................................ 2 GEOLOGIC SETTING ............................................................................................................................ 3 SUBSURFACE CONDITIONS ................................................................................................................ 3 SEISMICITY ANDFAULTING .............................................................................................................. 4 CBC DESIGN PARAMETERS ................................................................................................................ 5 GEOLOGIC HAZARDS .......................................................................................................................... 5 CONCLUSIONS ...................................................................................................................................... 7 EARTHWORK AND GRADING .......................................................................................................... 7 Stripping ........................................................................................................................................... 8 Preparation of Building Areas ........................................................................................................ 8 Compaction ....................................................................................................................................... 8 Shrinkage and Subsidence .............................................................................................................. 9 CONVENTIONAL SHALLOW SPREAD FOOTINGS ...................................................................... 9 SLABS-ON-GRADE ................................................................................................................................ 10 PRELIMINARY PAVEMENT DESIGN ................................................................................................ 10 CORROSION SERIES ............................................................................................................................. 11 UTILITY TRENCH BACKFILL ............................................................................................................. 11 EXTERIOR CONCRETE FLATWORK ................................................................................................. 11 DRAINAGE .............................................................................................................................................. 11 LIMITATIONS ......................................................................................................................................... 12 ADDITIONAL SERVICES ...................................................................................................................... 12 REFERENCES .......................................................................................................................................... 13 FIGURES- Site Location Map Regional Geologic Map Borehole Location Photograph Site Plan APPENDIX A Field Exploration APPENDIXB Laboratory Testing APPENDIXC- Seismic Design Map and Report Deaggregation Output S/adden Engineering www.SladdenEngineering.com November 7, 2018 1 Project No. 544-18356 18-11-538 INTRODUCTION This report presents the results of the geotechnical investigation performed by Sladden Engineering (Sladden) for the Cahuilla Health Center proposed for the subject site located on the south side of Cahuilla Road in the Anza area of Riverside County, California. The site is situated on the northern end of APN 572-190-004 and is located at approximately 33.5233 degrees north latitude and 116.7762 degrees west longitude. The approximate location of the site is indicated on the Site Location Map (Figure 1). Our investigation was conducted in order to evaluate the engineering properties of the subsurface materials, to evaluate their in-situ characteristics, and to provide engineering recommendations and design criteria for site preparation, foundation design and the design of various site improvements. This study also includes a review of published and unpublished geotechnical and geological literature regarding seismicity at and near the subject site. PROJECT DESCRIPTION Based on our preliminary discussions, it is our understanding that the proposed project will consist of constructing a new health care facility on the currently vacant property. We anticipate that the project will also include a new on-site sewage disposal system consisting of a septic tank and leach lines, stormwater retention areas, paved parking, underground utilities, concrete flatwork and various associated site improvements. For our analyses we expect that the proposed structure will consist of a single story
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