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Exhibit 5.B.1 EXHIBIT 5.B.1 EXHIBIT 5.B.2 REPORT OF GEOTECHNICAL INVESTIGATION GROSSMONT COLLEGE THEATER COMPLEX EL CAJON, CALIFORNIA Prepared for GROSSMONT-CUYAMACA COMMUNITY COLLEGE DISTRICT GAFCON – Campus Project Manager 8800 Grossmont College Drive El Cajon, California 92020 Prepared by GROUP DELTA CONSULTANTS, INC. 9245 Activity Road, Suite 103 San Diego, California 92126 Project No. SD443 December 11, 2015 Report of Geotechnical Investigation GDC Project No. SD443 Grossmont College Theater Complex December 11, 2015 Grossmont-Cuyamaca Community College District Page i TABLE OF CONTENTS 1.0 INTRODUCTION ............................................................................................................ 1 1.1 Scope of Services ...................................................................................................... 1 1.2 Site Description ........................................................................................................ 2 1.3 Proposed Development ............................................................................................ 2 2.0 FIELD AND LABORATORY INVESTIGATION .................................................................... 3 3.0 GEOLOGY AND SUBSURFACE CONDITIONS ................................................................... 3 3.1 Stadium Conglomerate ............................................................................................. 4 3.2 Fill ............................................................................................................................. 4 3.3 Groundwater ............................................................................................................ 5 4.0 GEOLOGIC HAZARDS .................................................................................................... 5 4.1 Ground Rupture ........................................................................................................ 5 4.2 Seismicity .................................................................................................................. 5 4.3 Liquefaction and Dynamic Settlement ..................................................................... 6 4.4 Landslides and Lateral Spreads ................................................................................ 6 4.5 Tsunamis, Seiches and Flooding ............................................................................... 6 5.0 CONCLUSIONS .............................................................................................................. 7 6.0 RECOMMENDATIONS ................................................................................................... 8 6.1 Plan Review .............................................................................................................. 8 6.2 Excavation and Grading Observation ....................................................................... 8 6.3 Earthwork ................................................................................................................. 8 6.3.1 Site Preparation............................................................................................ 8 6.3.2 Improvement Areas ...................................................................................... 9 6.3.3 Building Areas ............................................................................................... 9 6.3.4 Fill Compaction ........................................................................................... 10 6.3.5 Surface Drainage ........................................................................................ 10 6.3.6 Temporary Excavations .............................................................................. 10 6.3.7 Soldier Piles ................................................................................................ 11 6.3.8 Tie-Back Excavations .................................................................................. 11 6.3.9 Braced Excavations ..................................................................................... 12 6.3.10 Surcharge Loads ......................................................................................... 12 N:\Projects\SD\SD443 GDCCD Grossmont - Teaching & Performance Theater\15-0159\15-0159.doc Report of Geotechnical Investigation GDC Project No. SD443 Grossmont College Theater Complex December 11, 2015 Grossmont-Cuyamaca Community College District Page ii TABLE OF CONTENTS (Continued) 6.4 Foundation Recommendations .............................................................................. 12 6.4.1 Settlement .................................................................................................. 13 6.4.2 Lateral Resistance ....................................................................................... 13 6.4.3 Slope Setback ............................................................................................. 13 6.4.4 Seismic Design ............................................................................................ 13 6.5 On-Grade Slabs ....................................................................................................... 15 6.5.1 Moisture Protection for Slabs .................................................................... 15 6.5.2 Exterior Slabs .............................................................................................. 16 6.5.3 Expansive Soils ............................................................................................ 16 6.5.4 Reactive Soils .............................................................................................. 16 6.6 Earth-Retaining Structures ..................................................................................... 17 6.6.1 Cantilever Walls .......................................................................................... 17 6.6.2 Seismic Wall Design .................................................................................... 17 6.7 Preliminary Pavement Design ................................................................................ 18 6.7.1 Asphalt Concrete ........................................................................................ 18 6.7.2 Portland Cement Concrete ......................................................................... 18 6.8 Pipelines ................................................................................................................. 19 6.8.1 Thrust Blocks .............................................................................................. 19 6.8.2 Modulus of Soil Reaction ............................................................................ 19 6.8.3 Pipe Bedding ............................................................................................... 19 7.0 LIMITATIONS .............................................................................................................. 19 8.0 REFERENCES ............................................................................................................... 20 N:\Projects\SD\SD443 GDCCD Grossmont - Teaching & Performance Theater\15-0159\15-0159.doc Report of Geotechnical Investigation GDC Project No. SD443 Grossmont College Theater Complex December 11, 2015 Grossmont-Cuyamaca Community College District Page iii TABLE OF CONTENTS (Continued) LIST OF TABLES Table 1 2013 CBC Acceleration Response Spectra Table 2 Regional Seismicity LIST OF FIGURES Figure 1A Site Location Map Figure 1B Site Vicinity Plan Figure 2A Proposed Development Figure 2B Geologic Cross Section (North-South) Figure 2C Geologic Cross Section (East-West) Figure 3A Exploration Plan (Phase I) Figure 3B Exploration Plan (Phase III) Figure 4A Local Geologic Map Figure 4B Local Topographic Map Figure 5 Fault Location Map Figure 6A Deterministic Spectra Figure 6B Probabilistic Spectra Figure 6C Design Spectra Figure 7A Wall Drainage Details Figure 7B Seismic Wall Loads LIST OF APPENDICES Appendix A Field Exploration Appendix B Laboratory Testing N:\Projects\SD\SD443 GDCCD Grossmont - Teaching & Performance Theater\15-0159\15-0159.doc REPORT OF GEOTECHNICAL INVESTIGATION GROSSMONT COLLEGE THEATER COMPLEX GROSSMONT-CUYAMACA COMMUNITY COLLEGE DISTRICT 1.0 INTRODUCTION The following report presents the results of our geotechnical investigation for the new Arts and Communication Complex and Teaching and Performance Theater at Grossmont College. The Theater Complex will be located in the southwest portion of the campus, as shown on the Site Location Map, Figure 1A. Several small one-story structures (Buildings 22, 22A and 22B) currently occupy this portion of the campus, as shown in Figure 1B. The general layout of the proposed Theater Complex is shown in Figure 2A. Geologic cross sections of the proposed structure are provided in Figures 2B and 2C. The approximate locations of the additional subsurface explorations completed for this investigation are shown on Exploration Plans, Figures 3A and 3B. The purpose of our investigation was to characterize the general geotechnical constraints to site development, and provide geotechnical recommendations for grading and the design of the proposed structures, pavements, underground utilities, retaining walls and associated surface improvements. The recommendations provided herein are based on our review of previous geotechnical studies at the site, our recent subsurface exploration, laboratory tests, engineering and geologic analyses, and our previous experience with similar geologic condition. 1.1 Scope of Services This report was prepared
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