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20.52.090 C. Format of the Report. The following is an outline of the format each structural engineering report should follow. This format is not a rigid set of require- ments but, instead, provides a framework within which individual approaches to assembling the required infor- mation may be accomplished while also allowing the city to evaluate the completeness of each report. 1. General Information. A description of the building including: (a) the street address; (b) the type of occupancy and uses within the building; (c) plans and elevations showing the type and extent of lateral force resisting elements in the building; (d) a description of the type of construction materials used in the structural systems and information regarding their present condi- tions; and (e) the date of original construction, if known. 2. Investigation and Evaluation of Structural System. The items to be investigated and methods of investigation and analysis are contained in this chapter. Calculations and supporting documents prepared in this process shall be made a part of the report. 3. Test Reports. All field and laboratory test results shall be included in the report. A statement re- garding the significance of the test results shall be made for each type of structural system or feature tested. 4. Conclusions and Recommendations. Based on the investigation and analysis of the building's seis- mic resisting structural systems, a statement shall be provided to explain in lay terms the types of deficiencies in the event of an earthquake and a recommendation for remedial actions to correct them. D. Exceptions and Alternatives. Exceptions to the specific items required to be included in the struc- tural engineering reports may be granted by the building official upon review of a written request from the engi- neer preparing the report. Such a request shall provide evidence that adequate information concerning the re- quired item(s) can be determined by alternate means, or that a satisfactory conclusion on the building's seismic resistance can be reached without following one or more of the procedures contained in this chapter. The purpose of granting such exceptions shall be to reduce the costs or disruption that would result from taking required ac- tions, when it can be shown that they are unnecessary to provide information available by other equivalent means. The decision of the building official in granting exceptions is final. E. Review of the Reports. The city shall review each report for compliance with the procedures set forth in appendix B and those of this section. Reports not in compliance with these requirements will be required to be corrected and resubmitted for review. The in place shear test results will be the basis for classifying build- (Pleasanton Supp. No. 3, 1 -10) 858 ings into Category I. The city will notify property own- ers of that determination within six weeks of the city's receiving a report indicating average mortar shear strength of less than 30 psi. F. Availability of Reports. Reports submitted to the city will be made available for review to any in- terested party. (Ord. 1563 § 1, 1992) 20.52.090 Historic buildings. A. General. An historic building may comply with the special provisions set forth in this chapter and the provisions of the state historical building code. B. Unburned Clay Masonry or Adobe. Existing or reerected walls of adobe construction shall conform to the following: 1. Exterior bearing walls of unreinforced adobe masonry shall not exceed a height or length to thickness ratio of five to one. Such walls shall be provided with a reinforced bond beam at the top which interconnects all walls. The bond beam shall have a minimum depth of six inches. The bond beam may have a width equal to the width of the wall less eight inches; provided, the resulting width is not less than eight inches. Minimum wall thickness shall be 18 inches for exterior bearing walls and 10 inches for adobe partitions. No adobe structure shall exceed one story in height unless the his- toric evidence satisfactory to the chief building official and the community development director indicates a two -story height. In such cases the height to thickness ratio shall be the same as above for the first story based on the total two -story wall height, and the second floor wall thickness shall not exceed the ratio of five to one by more than 20 percent. Bond beams shall be provided at the roof and second floor levels. 2. Foundation footings shall be reinforced con- crete under newly reconstructed walls and shall be 50 percent wider than the wall above, soil conditions per- mitting, except that the foundation wall may be four inches less in width than the wall if rock, burned brick or stabilized adobe facing is necessary to provide au- thenticity. 3. New or existing unstabilized brick and adobe brick masonry shall test to 75 percent of the com- pressive strength required by the uniform building code for new material. Unstabilized brick may be used where existing bricks are unstabilized and where the building is not susceptible to flooding or direct exposure to the weather. Adobe may be allowed a maximum value of three pounds per square inch for shear with no increase for lateral forces. 4. Mortar may be of the same soil composition and stabilization as the brick in lieu of cement mortar.