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Page 10 <br /> <br />In the future, sources of uncontrolled water, such as leaky sewer, water (domestic, <br />irrigation) or drainpipe, should be repaired if identified. <br /> <br />Seismic Design <br /> <br />We recommend the proposed new structure be structurally designed to meet the <br />applicable building codes and requirements of the controlling governmental agencies. <br />The seismic parameters provided in the “Seismicity” section of this report can be used. <br />The civil/structural design engineer should consult with the project geotechnical <br />consultant, if additional geotechnical information is needed for the seismic design. <br /> <br />Cement Type For Concrete in Contact with On-Site Earth Materials <br /> <br />Our previous tests performed on the soils of many lots in the City of Santa Ana which are <br />similar to the on-site soils show negligible water-soluble sulfate contents. Sulfate attack <br />on concrete was not observed for the existing on-site house and other houses in the <br />surrounding areas. It appears sulfate attack on concrete is not considered to be a problem <br />for this project. However, for conservative purpose, Type V cement with a maximum <br />water/cement ratio of 0.45 and a minimum concrete strength, f'c of 4,500 psi is <br />recommended to be used for concrete in contact with the on-site soils. Additional water- <br />soluble sulfate content testing can be performed for the soils at the site, as needed. The <br />test can be conducted during and/or after completion of site preparation/grading. <br /> <br />The applicable California Building Code (2022 CBC) and other requirements by <br />controlling governmental agencies should be followed. <br /> <br />Corrosion To Ferrous Metals and Copper <br /> <br />For conservative purposes, the on-site soils can be considered severely corrosive to <br />ferrous metals and copper. Underground/buried ferrous metals or copper are not planned <br />to be used for this project. However, if underground/buried ferrous metals or copper are <br />planned to be used at the site, they should be properly protected. A corrosion specialist <br />can be consulted. Testing can be performed for verification of the potential corrosion of <br />the soils at the site to ferrous metals and copper, if needed. The test can be performed <br />during and/or after completion of grading. <br /> <br />Geotechnical Review of Grading and Foundation Plans <br /> <br />Based on the City’s requirements, the project geotechnical consultant should review, <br />“approve” and sign the project grading and foundation plans with details/specifications, if <br />any, indicating conformation to applicable geotechnical recommendations. <br /> <br />We will corporate with the civil/structural design engineers who prepare the plans to <br />ensure our geotechnical recommendations are properly incorporated into the plans. <br />