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Ordinance No. 2083 Page 6 20.08..090 CBC Section 1705.3 amended - Concrete Construction. Section 1705.3 is amended to read as follows: 1705.3 Concrete Construction. The special inspections and verifications for concrete construction shall be as required by this section and Table 1705.3. Exceptions: Special inspections shall not be required for isolated spread concrete footings of buildings three stories or less above grade plane that are fully supported on earth or rock, where the structural design of the footing is based on a specified compressive strength, f'c, no greater than 2,500 pound per square inch (psi) (17.2 Mpa). 20.08.100 CBC Section 1809.8 amended — Plain concrete footings. Section 1809.8 is amended to read as follows: 1809.8 Plain concrete footings. The edge thickness of plain concrete footings supporting walls of other than light-frame construction shall not be less than 8 inches (203mm) where placed on soil and in all cases, as a minimum, one '/z" (51mm) continuous rebar shall be placed at the top and at the bottom of all grade beams and spread footings. Exception: For plain concrete footings supporting Groups R-3 and one story Group U occupancies the edge thickness is permitted to be 6 inches (152mm), provided that the footing does not extend beyond a distance greater than the thickness of the footing on either side of the supported wall. In all cases, as a minimum, one ''/2' (51mm) continuous rebar shall be placed at the top and at the bottom of all grade beams and spread footings. 20.08.110 CBC Section 1905.1.8 amended - ACI 318 section 22.10.1. Section 1905.8 is amended to read as follows: 1905.1.8 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. (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