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Report of Soils Investigation <br />2215 South Standard Ave., Proposed Addition <br />Santa Ana. California <br />Page 9 of 27 <br />Job No. 40-0613 <br />Aoril 5- 1999 <br />-t <br />I <br />I <br />l <br />I <br />l <br />8.4.2 Local and Resional Fa u Ir ng <br />The geologic structure of the Southern California area is dominated by northwest <br />trending faults associated with the San Andreas system. Faults such as the <br />Whiuier, Elsinore, San Jacinto, San Andreas, and Newpon-Inglewood are the <br />major faults in the system. They are all known to be seismically active, and the <br />San Andreas and San Jacinto faults are known to have ruptured the ground <br />surface in historic time. <br />Available geologic literature indicated that no active (Quaternary) faults are <br />known to exist on the site. No evidence of active faulting was observed during <br />our investigation. The closest known active fault is the Newport-Inglewood Fault <br />Zone located approximately 7 miles west of the site. The principle faults in the <br />site vicinity considered most likely to ruptue and possibly cause strong ground <br />shaking at the site during the useful life ofthe proposed construction are listed in <br />Table I. The listing includes a summary of important seismic characteristics <br />estimated for each fault. <br />.-1 <br />.i. <br />-t <br />I <br />I