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1022 S. Hickory Street GE24033 <br />Santa Ana, CA May 21, 2024 <br /> <br />Page 9 of 14 <br />GEOMAX Engineering, Inc. <br /> <br /> <br />Expansive Soils <br /> The native soils are sandy clays. Although no actual expansion index test was <br />performed, the sandy clayey soils are considered to be medium-to highly-expansive. <br />Therefore. footings into native soils shall be provided with two, # 4 re-bars at top and <br />bottom, and slabs on-grade and concrete pavements shall be reinforced with # 4 re- <br />bars spaced at 12 inches on center each way. Sub-grade soils for slabs should be <br />saturated for 24 hours prior to placing concrete. <br /> <br />Liquefaction Potential <br /> The Seismic Hazard Map of the Tustin Quadrangle (reference # 5) shows that the <br />subject site is located within an area susceptible to soil liquefaction. However, the <br />proposed one-story additional dwelling unit is exempt from the liquefaction requirements <br />per the State of California Public Resources Code, Section 2621.6 (Seismic Hazard <br />Mapping Act). Therefore, special recommendations to mitigate the potential of soil <br />liquefaction are not necessary. <br /> <br />Hydro-collapse <br /> The phenomenon of hydro-collapse affects mostly granular soils that are <br />transported and deposited by a fast, storm flow typical of deserts that drained rapidly <br />without full saturation. The alluvial soils within the subject site and its vicinity are not <br />subject to hydro-collapse. <br /> <br />1022 S Hickory St <br />1/9/2025