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Our previous tests performed on the soils of many lots in the City of Garden Grove 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 of Garden Grove. However, for conservative purposes, Type V cement with a maximum water/cement ratio of 0.45 and a minimum concrete strength, of 4,500 psi is recommended to be used for concrete in contact with the on-site soils. 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 (2022 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 cooperate with the civil/structural design engineers who prepare the plans to ensure our geotechnical recommendations are properly incorporated into the plans. Geotechnical Observation and Testing During Construction We recommend that a qualified geotechnical consultant be retained to provide geotechnical engineering services, including geotechnical observation/testing, during the construction phase of the project. This is to verify the compliance with the design, specifications and/or recommendations, and to allow design changes in the event that subsurface conditions differ from those anticipated. Geotechnical observation/testing can be performed at the following stages: ● During ANY grading operations, including excavation, removal, filling and backfilling, etc. ● During and after excavation for footings to verify the adequacy of underlying materials. ● After pre-saturation of slab subgrade earth materials, if any, prior to pouring concrete. 906 S Virlee St & #2 - <br />10111904212/9/2024