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Existing School Safety Certification <br />• A search using DTSC's EnviroStor database did not identify any underground storage <br />tanks (USTs) and leaking underground fuel tanks (LUFT) of interest within 1,500 feet <br />of the site. <br />No potentially hazardous public utility infrastructure is located in proximity to the project <br />site. Further, since the project would be constructed completely within the confines of the <br />existing school campuses, no new or additional risks to students would occur. <br />g. Liquefaction/Landslides <br />(1) Regulation <br />The site is not subject to moderate to high liquefaction or landslides. <br />(2) Consistency Analysis <br />Liquefaction of soils can be caused by ground shaking during earthquakes. Research and <br />historical data indicate that loose, relatively clean granular soils are susceptible to liquefaction <br />and dynamic settlement, whereas the stability of the majority of clayey silts, silty clays, and clays <br />is not adversely affected by ground shaking. Liquefaction is generally known to occur in <br />saturated, cohesionless soils at depths shallower than approximately 50 feet. Dynamic settlement <br />due to earthquake shaking can occur in both dry and saturated sands. <br />Landsliding is a type of erosion in which masses of earth and rock move downslope as a <br />single unit. Susceptibility of slopes to landslides and other forms of slope failure depend on <br />several factors. These are usually present in combination and include, but are not limited to, <br />steep slopes, condition of rock and soil materials, presence of water, formational contacts, <br />geologic shear zones, and seismic activity. <br />According the California Geological Survey, the southern portion of the project site is <br />located in an area "where historic occurrence of liquefaction, or local geological, geotechnical <br />conditions indicate a potential for permanent ground displacements such that mitigation as <br />defined in the California Public Resources Code Section 2693(c) would be required." 13 While <br />the southern portion of the project site could be subject to ground settlement or other <br />L' Per written communication with Rodolfo Rosas, P.E., Senior Civil Engineer, Santa Ana City Prater Resources, <br />August 29, 2012. <br />3 California Department of Conservation, California Geological Survey (formerly Division of ;bfines and Geology). <br />"State of California Seismic Hazard Zones, Tustin Quadrangle. " Revised January 17, 2001. Located at <br />lutp:, %>nzw.consrl?.ca.govishmp;htmt/ ft maps so.html. Accessed December 4, 2012. <br />Citv of Santa Ana <br />PCt2 Services Corporation <br />Roosevelt Elementary Park Development <br />December 2012 <br />Page 8 <br />25B-10