5604 W Highland St & #2 - 101119017-18 - Plan

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Page 9 In the future, sources of uncontrolled water, such as leaky sewer, water (domestic, irrigation) or drainpipe, should be repaired if identified. Seismic Design We recommend the proposed new structure be structurally designed to meet the applicable building codes and requirements of the controlling governmental agencies. The seismic parameters provided in the “Seismicity” section of this report can be used. The civil/structural design engineer should consult with the project geotechnical consultant, if additional geotechnical information is needed for the seismic design. Cement Type For Concrete in Contact with On-Site Earth Materials Our previous tests performed on the soils of many lots in the City which are similar to the on-site soils show negligible water soluble sulfate contents. Sulfate attack on concrete was not observed for the existing on-site house and other houses in the surrounding areas. It appears sulfate attack on concrete is not a problem in the City. Therefore, Type V cement with a maximum water/cement with a maximum water/cement ratio of 0.45 and a minimum concrete strength, f’c of 4,500 psi is not considered necessary. Cement type and concrete strength designed by the civil/structural design engineer such as 2,500 psi can be used. Additional water-soluble sulfate content testing can be performed for the soils at the site, as needed. The test can be conducted during and/or after completion of site preparation/grading. The applicable California Building Code (2019 CBC) and other requirements by controlling governmental agencies should be followed. Corrosion To Ferrous Metals and Copper For conservative purposes, the on-site soils can be considered severely corrosive to ferrous metals and copper. Underground/buried ferrous metals or copper are not planned to be used for this project. However, if underground/buried ferrous metals or copper are planned to be used at the site, they should be properly protected. A corrosion specialist can be consulted. Testing can be performed for verification of the potential corrosion of the soils at the site to ferrous metals and copper, if needed. The test can be performed during and/or after completion of grading. Geotechnical Review of Grading and Foundation Plans Based on the City’s requirements, the project geotechnical consultant should review, “approve” and sign the project grading and foundation plans with details/specifications, if any, indicating conformation to applicable geotechnical recommendations. We will corporate with the civil/structural design engineers who prepare the plans to ensure our geotechnical recommendations are properly incorporated into the plans. 5604 W Highland St & #2 - 101119017-1811/19/2024