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<br /> <br />ASSOCIATED SOILS ENGINEERING, INC. Project No.: 7160.23 <br />2860 Walnut Avenue, Signal Hill CA 90755 January 23, 2024 <br />Tel: (562) 426 -7990 * Fax: (562) 426 -1842 Page 2 <br />A. Review of readily available background information, including in-house geotechnical data, <br />geotechnical literature, geologic maps, seismic hazard maps, and literature relevant to the Site. <br />B. A geotechnical site reconnaissance to observe the general Site conditions and to select/mark boring <br />locations, followed by 72-hour notification to Underground Service Alert prior to field investigation. <br />C. Field exploration consisting of drilling two (2) exploratory borings to depths of 25 feet 11 inches and <br />26 feet below respective existing grades. ASE staff logged and sampled representative soils <br />encountered in each exploratory boring. Locations of the exploratory borings on site are shown on <br />the Boring and Percolation Test Location Plan, Plate A, in Appendix A. <br />D. Field percolation testing at two (2) percolation test borings location (i.e. Percolation Borings B-P1 and <br />B-P2, with approximate locations shown on the Boring and Percolation Test Location Plan, Plate A, in <br />Appendix A) to measure infiltration rates of site soils as part of the requirements for the planning and <br />design of on-site stormwater Low Impact Development (LID) facilities. <br />E. Laboratory testing on retrieved representative soil samples for classification and for determination of <br />pertinent engineering properties. <br />F. Engineering analyses of data obtained from literature review, the site investigation and laboratory <br />testing covering the following aspects: <br />• Evaluation of general subsurface conditions and description of types, distribution, and <br />engineering characteristics of subsurface materials. <br />• Assessment and quantification of geologic/seismic hazards based on the pertinent criteria <br />required by the California Geological Survey (CGS). <br />• Determination of the seismic design parameters in accordance with Chapters 16 and 18 of <br />the California Building Code, 2022 Edition (2022 CBC; Reference 5). <br />• Evaluation of the suitability of on-site soils for foundation support, followed by establishment of <br />qualification criteria for on-site or imported fill material, and recommendations for site remedial <br />grading and subgrade preparation for the Building. <br />• Recommendations of suitable foundation systems including conventional shallow footing <br />foundations, covering minimum dimensions, allowable bearing capacity, estimated settlement, <br />and lateral resistance. <br />• Recommendations for subgrade preparation and design parameters for slab-on-grade and <br />flatwork support. <br />• Recommendations for temporary excavation, shoring and trenching. <br />• Evaluation of the corrosion and expansion potential of the on-site materials.