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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) 7 4.3 EARTHWORK The earthwork anticipated at the project site will consist of clearing and grubbing, excavation of undocumented fills, excavation of disturbed soils and a portion of natural soils, subgrade preparation, and placement and compaction of fill. 4.3.1 Clearing and Grubbing Prior to grading, performing excavations or constructing the proposed improvements, the areas to be developed should be stripped of vegetation and cleared of debris. Buried obstructions, such as footings, abandoned utilities, and tree roots should be removed from areas to be developed. Deleterious material generated during the clearing operation, including organic topsoil, should be removed from the site. If approved by the owner and regulatory agency, inert demolition debris, such as concrete and asphalt may be crushed for reuse in engineered fills outside the planned building area in accordance with the criteria presented in the "Materials for Fill" section of this report. Although none were encountered, cesspools or septic systems encountered during grading should be removed in their entirety. The resulting excavation should be backfilled as recommended in the “Subgrade Preparation” and “Placement and Compaction of Fill” sections of this report. As an alternative, cesspools can be backfilled with a clean sand- cement slurry. At the conclusion of the clearing operations, a representative of GPI should observe and accept the site prior to further grading. 4.3.2 Excavations Excavations at this site will include removals of undocumented fills and a portion of natural soils, foundation excavations, and trenching for proposed utility lines. Prior to placement of fills or construction of the foundations, undocumented fills, disturbed soils, and some compressible natural soils should be removed and replaced as properly compacted fill to help provide uniform support for the building. These materials require densification to provide adequate support of the building foundation. For planning purposes, we recommend the removal and replacement of soils within the building pad to extend to a minimum depth of 5 feet below existing grades or 2 feet below the bottom of foundations, whichever is greater. The purpose of our recommendations is to remove the undocumented fills and a portion of the natural soils directly under the foundations and replace these soils as properly compacted fill. If a mat foundation is utilized, the removal and replacement of soils withing the building pad should extend a minimum depth of 3 feet or 1 foot below the mat, whichever is deeper. For footings of minor lightly-loaded structures outside of the building pad, such as trash enclosures, we recommend that the removals and replacement extend to at least 2-feet below the bottom of footings. The actual depths of removals should be determined in the field by GPI during grading. 1202 W Edinger Ave10/3/2024