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Geotechnical Investigation Report 03/11/2025 2234 S Lowell St., Santa Ana, CA 92707 Page | 10 Grading should conform to the guidelines presented in the 2022 California Building Code (CBC, 2022), as well as the requirements of the City of Santa Ana. Additionally, general Earthwork and Grading Guidelines are provided herein as Appendix IV. During earthwork construction, removals and reprocessing of fill materials, as well as general grading procedures of the contractor should be observed, and the fill placed selectively tested by representatives of the geotechnical engineer. If any unusual or unexpected conditions are exposed in the field, they should be reviewed by the geotechnical engineer and if warranted, modified and/or additional remedial recommendations will be offered. Specific guidelines and comments pertinent to the planned development are provided herein. The recommendations presented herein have been completed using the information provided to us regarding site development. If information concerning the proposed development is revised, or any changes in the design and location of the proposed property should be approved in writing by this office. - Site Preparation: In general, prior to earthwork or construction operations, the site should be cleared of surface and subsurface obstructions and stripped of any vegetation in the areas proposed for development. Removed vegetation and debris should then be properly disposed of off-site. Holes resulting from removal of trees and buried obstructions which extend below finish site grades should be backfilled with suitable fill soils compacted to a minimum 90 percent relative compaction (based on ASTM Test Method D 698). - Fill Placement and Compaction: If necessary, the on-site soils are suitable for reuse as compacted fill, provided they are free of organic materials and debris and material larger than 6 inches in diameter (in case encountered). Should imported soils be utilized for near-surface fills, these soils should be predominately granular, possess a low or very low expansion potential, and be approved by the geotechnical engineer prior to their transportation to the site. Lift thickness will be dependent upon the size and type of equipment used. In general, fill should be placed in uniform lifts not exceeding 8 inches. Placement and compaction of fill should be performed in accordance with local grading ordinances under the observation and testing of the geotechnical consultant. We recommend that if encountered, oversize materials (materials greater than 6 inches in maximum dimension) be removed from the upper 4 feet of fill or placed in accordance with the General Earthwork and Grading Guidelines contained in Appendix IV. - Trench Excavations and Backfill: Trenches are anticipated to be excavated with moderate effort using conventional construction equipment in good operating condition. Deep trenches may require the use of heavy equipment operations. The encountered soils at the site consisted of loose to medium dense clayey fine sand, as such these soils may be subject to collapse and cave-ins (refer to the caving potential section).