04 ATTACHMENT 6 - Laserfiche WebLink

Project No. E9164-04-0 2 - 6 - April 15, 2020 6. CONCLUSIONS AND RECOMMENDATIONS 6.1 General 6.1.1 No overriding geotechnical constraints were encountered during our investigation that would preclude the project as presently proposed. A primary geotechnical consideration is the potential for strong seismic shaking. 6.1.2 Based on the assumed structural loading, we anticipate the planned one- and two--story structures can be supported on conventional shallow continuous strip or spread footings. Remedial grading will be required to remove and re-compact the exposed subgrade after stripping. 6.1.3 If any undocumented fill materials are encountered during site development, supplemental recommendations will be provided. 6.1.4 For shallow foundation systems designed and constructed as recommended herein, estimated post- construction settlement due to dead + live loads should be ¾ inch or less with differential settlements of approximately ½ inch across a horizontal distance of 50 feet or between columns. 6.1.5 Project grading plans were not available at the time of this report. We should review grading plans once available to determine applicability of the recommendations provided herein, particularly those related to site grading and building pad preparation. Updated or supplemental recommendations may be necessary. 6.1.6 Any changes in the design, location or elevation of the proposed improvements, as outlined in this report, should be reviewed by this office. Geocon should be contacted to determine the necessity for review and possible revision of this report. 6.2 Seismic Design Criteria 6.2.1 We understand that seismic structural design will be performed in accordance with the provisions of the 2019 CBC, which is based on the American Society of Civil Engineers (ASCE) publication Minimum Design Loads for Buildings and Other Structures (ASCE 7-16). We derived the following seismic design parameters using the web-based Structural Engineers Association of California application U.S. Seismic Design Maps. Results are summarized in Table 6.2.1. The values presented are for the risk- targeted maximum considered earthquake (MCER) and Seismic Risk Category II.