Laserfiche WebLink
<br /> <br /> <br /> <br /> <br /> <br />3rd & Broadway, Santa Ana, CA <br />Volume 1 - Basis of Design June 17, 2024 | Project # S21043.00 <br /> pg. 26 <br />2.5 SEISMIC LOADING <br />2.5.1 GEOTECHNICAL INFORMATION <br /> <br />The site is underlain by a mantle of undocumented artificial fill materials overlaying Quaternary- <br />aged young alluvial fan deposits. The artificial fill encounter in Leighton’s boring is about 2 feet in <br />thickness. The fill consists primarily of silty sand and clay. Below the artificial fill, alluvial sediments <br />consist of silty sand and clay were encountered to the maximum depth explored (76 ½ feet bgs). <br />The proposed building will be supported on a mat foundation bearing in undisturbed natural soils. <br />The site is located in a seismically active region. The principal seismic hazard to the site is ground <br />shaking resulting from an earthquake occurring along any of several major active and potentially <br />active faults in southern California. <br />The liquefaction potential of soil underlying the site was also evaluated by Leighton. The site is not <br />located within an area that has been identified by the State of California as being potentially <br />susceptible to liquefaction. Furthermore, ground water was not encountered during the subsurface <br />exploration to the total depth of 76 ½ feet and historically high groundwater table in the area is <br />deeper than 40 feet. Therefore, in Leighton’s opinion, the potential for liquefaction occurring at the <br />site was low. See the geotechnical report for additional information.