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LAND USE ELEMENT <br />LAND USE CONSTRAINTS <br />GEOLOGICAL CONSTRAINTS <br />Soil conditions within the City are a direct result of stream and wind deposition. <br />A soil survey by the U.S. Department of Agriculture, Soil Conservation Service <br />shows chat there are a wide variety of soils existing in the City, some oFwhich may <br />present constraints to future development. <br />In addition to soil constraints, numerous geological faults have been mapped <br />within the Southern California region, many ofwhich are located within SO miles <br />of the Cit}: However, no known major Fault traces are located in the City and <br />Santa Ana is not included in an Alquist-Priolo Earthquake Fault "hone. "1'he most <br />significant issues warranting consideration include the following: <br />Expansive Soils - Highly expansive soils require compaction prior co <br />development to reduce the amount of swelling when wet. A high soil <br />expansion hazard is present in Omni and'Thapto soils which arc found in the <br />south. central section of the City, south ofScgerscrom Avenue between Susan <br />Street and the Costa Mesa Freeway. <br />Erosion - An erosion hazard is associated mainly with soils along ehe Santa <br />Ana River and Santiago Creek. Since the Santa Ana River is channelized, <br />erosion hazards remain only on Santiago Creek. <br />Surface Rupture -Surface rupture refers to the tearing and/or displacement <br />'9 '° of the earth along a fiult trace that has experienced an earthquake. No <br />.~ <br />_> <br />,,, ~ ~, known or suspected faults are located within chc City. As a result, the <br />r ~ ~. t". ~ ~ - ~ olution No. 20'10-025 <br />~ ~ ~ . 's, ., z pocenttal for surface rupture is considered to be c ei* <br />•,,,~. ; , y,. ~..,--- - ~ Page 83 of 107 <br />A-40 CITY OF SANTA ANA GENERAL PLAN <br />