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GEOTECHNICAL ENGINEERING AND GEOLOGICAL HAZARD STUDY LINCOLN ELEMENTARY SCHOOL MODERNIZATION 750 E. YOSEMITE AVENUE MANTECA, CALIFORNIA 1.0 INTRODUCTION 1.1 GENERAL This report includes the results of a Geotechnical Engineering and Geological Hazard Study (GENS) for the proposed Lincoln Elementary School Modernization Project located at 750 E. Yosemite Avenue in Manteca, California 95337 at approximate global positioning satellite (GPS) coordinates 37.796416°, - 121.206136°. The general location of the site is shown on the Vicinity Map, Figure 1; and Site Map with Boring Locations, Figure 2, Appendix A. The USES topographic map, Manteca Quadrangle, indicates the project site is located in the northeast quarter of Section 4 Township 2 South, and Range 7 East, Mt. Diablo Base and Meridian. The approximate site elevation is 38 feet above mean sea level. Condor Earth Technologies, Inc. (Condor) performed this study at the request of Ms. Susan Bell of Manteca Unified School District. This report was prepared to meet the requirements of Title 24 Geotechnical Engineering Studies. 1.2 PROJECT DESCRIPTION' We understand that design of the proposed Cafeteria; Administration Building is currently underway and final details are not available as of this writing. On a preliminary basis, we understand the proposed project will consist of an cafeteria and administration building with a foundation area of approximately 35,000 square feet and will be constructed on shallow foundations with isolated and perimeter spread footings; additions and remodelling of the present cafeteria to form a media center with ilex labs, and a future classroom building with a foundation area of approximately 10,000 square feet. Some existing buildings will be repurposed or removed and asphalt areas will be repaired or replaced. The proposed layout for the Lincoln Elementary School Modernization Project site is shown on Figure 2 — Site Map with Boring Locations, Appendix A. 2.0 PURPOSE AND SCOPE This GEHS was performed to 1) identify the geological hazards at the site; 2) characterize geotechnical conditions at the site; 3) identify geotechnical or geologic conditions that might impact design or construction of the site; 4) provide geotechnical recommendations to mitigate geotechnical constraints to the site; and 5) provide geotechnical criteria for design of project foundations and slabs -on -grade. Condor completed the following work for this GES: Reviewed available maps and documents relevant to the site geology, seismic setting, and geotechnical conditions. 2. Explored subsurface conditions by means of eleven (11) soil borings ranging in depth from approximately 10 and 50 feet below the existing site grade. The boring locations are shown on Figure 2, Appendix A. Cross sections of the borings are shown on Figure 3 and 3A, Appendix A. Soil boring logs are presented in Appendix B. W � ss-