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5. Nominal tension stresses due to seismic <br />forces normal to the wall may be neglected if the wall <br />meets the thickness requirements and shear values al- <br />lowed by this subsection. <br />C. Archaic Materials. Allowable stresses for <br />archaic materials not specified in the state historical <br />building code shall be based on substantiating research <br />data or engineering judgment with the approval of the <br />chief building official. (Ord. 2000 § 1, 2009; Ord. 1563 <br />§ 1, 1992) <br />859 <br />20.52.090 <br />(Pleasanton Supp. No. 3, 1 -10) <br />