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Our Job 81-20-00 Pag e 10 <br />zones could be expected to produce ground accelerations <br />of up to 0.2g at the epicenter with a period of strong <br />motion of from 0.5 to 2 seconds for a duration of 15 to <br />20 seconds. Statistically, there is a 40 percent prob- <br />ability of this event occurring once during a SO-year <br />interval. Excitation occurring from a Richter lr{agnitude <br />8.0 event on the more distant parts of the San Andreas <br />fault system could be expected to produce site ac'celera- <br />tions in the range of 0.729 to 0.159, a period of 1.0 <br />second or longer for a duration of as rnuch as 40 seconds. <br />1 . 4O FOUNDATION DESI GN <br />It is our opinion that the proposed structure <br />can be supported by a shallow foundation system consisting <br />of isolated wal1 panel and column footings and slabs on <br />grade. This conclusion is predicated on the assumptions <br />that (1) the site is prepared in accordance with recom- <br />mendations presented in this rePort, and (2) the foundation <br />system is designed to be conpatible with the settlement <br />induced by the foundation loading. Our analysis indicates <br />that footing settlements should be less than one inch and <br />differential settlements should be less than %-inch if <br />footing design and site preparation are performed in <br />accordance with the recomnendations contained herein.