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SECTION 7 -5 -180: CONCRETE AND MASONRY FOUNDATION WALLS Section 1807.1.6 of the 2010 Edition of' the California Building Code is amended to read as follows: 1807.1.6 Prescriptive design of concrete and masonry foundation walls. Concrete and masonry foundation walls that are laterally supported at the top and bottom shall be permitted to be designed and constructed in accordance with this section. Prescriptive design of foundation walls shall not be used for structures assigned to Seismic Design Category D. E or F. SECTION 7 -5 -185: MODIFICATIONS TO ACI 318 Section 1908.1 is amended to read as shown below and Sections 1908.1.11 thru 1908.1.14 is added to Chapter 19 of the 2010 Edition of the California Building Code: The last paragraph of Section 1908.1.2 of the 2010 Edition of the California Building Code is amended to read as follows: All special moment frames and special structural walls shall also satisfy 21.1.3 through 21.1.7. Concrete tilt -up wall panels classified as intermediate precast structural wall system shall satisfy 21.9 in addition to 21.4.2 and 21.4.3 for structures assigned to Seismic Design Category D. E or F. 1908.1.8 ACI 318, section 22.10 Delete ACI 318, section 22.10, and replace with the following: 22.10 - Plain concrete in structures assigned to seismic design category C, D. E or F. 22.10.1- Structures assigned to Seismic Design Category C. D, E or F shall not have elements of structural plain concrete. except as follows: (a) Isolated footings of plain concrete supporting pedestals or columns are permitted. provided the projection of the footing beyond the face of the supported member does not exceed the footing thickness. Exception: In detached one and two - family dwelling three stories or less in height, the projection of the footing beyond the face of the supported member is permitted to exceed the footing thickness. (b) Plain concrete footing supporting walls are permitted, provided the footings have at least two continuous longitudinal reinforcing bars. Bars shall not be smaller than No. 4 and shall have a total area of not less than 0.002 times the gross cross - sectional area of the footing. A minimum of one bar shall be provided at the top and bottom of the footing. Continuity of reinforcement shall be provided at corners and intersections. Exception: In detached one and two - family dwellings three stores or less in height and constructed with stud bearing walls. plain concrete footings -with at least two 25