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Mater Dei High School October 20, 2023 Proposed Dance Studio, Santa Ana, California Project No. 3204.I 3204-I-01R (10/23) 4 4.0 CONCLUSIONS AND RECOMMENDATIONS 4.1 OVERVIEW Based on the results of our investigation, it is our opinion that from a geotechnical engineering viewpoint it is feasible to develop the site as proposed. We assume that the proposed building will be supported on mat foundations or spread footings connected by grade beams. These types of foundations can be designed to support the building provided the geotechnical constraints discussed below are mitigated including the significant seismic settlements due to a design level earthquake. The most significant geotechnical issues that will affect the design and construction of the proposed structure are as follows: •There is a potential for liquefaction induced seismic settlement to adversely impact the buildings. Layers of sandy soils between depths of approximately 10 to 31½ feet below existing grade exhibit a potential for liquefaction. Should liquefaction of these layers occur, the estimated magnitude of induced settlement is expected to be on the order of 2 inches. •Structural mitigation for the impacts of seismic settlements using a mat foundation or grade beam connected foundations can be considered by the Structural Engineer provided the building can be designed to accept the estimated settlements. •Prior to placement of fills or construction of the foundations, undocumented fills and a portion of the natural soils should be removed and replaced as properly compacted fill within the building pad. Details on the depth of removals for the foundation alternatives are provided in “Excavations” section of this report. •Removals are recommended in the pavement areas for drives and parking and under minor structures, in order to provide a consistent, moist layer of soils for uniform support. The depth of removals and details regarding grading are provided in “Earthwork” section of this report. •The near surface soils show a moderate expansion potential. 2-feet of granular, non-expansive material should be placed within the proposed building pad, if slab- on-grade floors are utilized, and within 10 feet of the proposed building. •The on-site soils are severely corrosive to buried metal elements. Our recommendations related to the geotechnical aspects of the development of the site are presented in the subsequent sections of this report. 1202 W Edinger Ave10/3/2024