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14
City of Pleasanton
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CITY CLERK
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2007
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120407
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14
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11/28/2007 2:27:21 PM
Creation date
11/28/2007 12:27:52 PM
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CITY CLERK
CITY CLERK - TYPE
STAFF REPORTS
DOCUMENT DATE
12/4/2007
DESTRUCT DATE
15 Y
DOCUMENT NO
14
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(Braced wall line Sheathing), 20.08.053 (plain concrete footings), 20.08.055 (minimum <br />slab provisions), 20.08.082 (appendix chapter J Grading and Excavating), 20.08.018 <br />(occupancy separations), 20.08.060 (maximum area of exterior wall openings), <br />20.08.032 (allowable height and building area), 20.08.038 and 20.08.039 (attachment <br />of sheathing), 20.08.040 (braced wall line sheathing), 083 (braced wall line support), <br />20.08.081 (modifications to ASCE 7), 20.08.084 (number of stories), 20.08.086 and <br />20.08.088 (definitions), 20.08.090 (repairs), 20.08.094 (change in occupancy), <br />20.08.097 (Gypsum Lath), 20.08.100 (Gypsum Sheathing), 20.08.105 (Other Gypsum <br />Boards) the City of Pleasanton is located in a very active seismic area (seismic design <br />categories D and E) and is located roughly between the Calavaras and Greenville <br />faults. The topography of the City of Pleasanton is such that significant areas of the <br />City are either in an ancient swamp basin or on slopes. The great majority of soils <br />(based on soils reports on file) in the City are of a clayey material. This clayey material <br />is susceptible to constant expansion and shrinkage, which adversely affects the <br />foundation of any structure, but particularly foundations without reinforcing steel. <br />Recent seismic events such as the Loma Preita and the Northridge earthquake in <br />Southern California provided hundreds of examples of damage to plain concrete <br />footings and heaving in plain concrete slabs. It is therefore appropriate to limit the use <br />of these unreinforced concrete foundations with underlaying clayey soils, as the cost to <br />repair is extremely expensive in contrast to the nominal cost of footing reinforcement at <br />the time of original installation. The poor soil that these foundations and slabs must rely <br />on to hold up buildings then are of vital importance to constructing a building. Further, <br />the reliance of the new California Codes on automatic fire sprinkler systems over <br />passive fire protection, such as elimination of fire rated walls and reduced separation of <br />exists, does not address the vulnerability of the City's water distribution system, pumps, <br />and supply tanks that could be damaged as a result of an earthquake event. An <br />additional concern is the allowed use of nonstructural elements such as stucco, particle <br />board, and gypsum wall board to resist the lateral forces that are generated from an <br />earthquake or high wind event. The repair costs for structures that depend on these <br />nonstructural elements for resistance to lateral forces is far greater than the repair costs <br />to structures that utilize the more traditional plywood and oriented strand board (OSB) <br />shear walls and braced wall panels. <br />5. As to Chapter 20.24, the International Fire Code, amendments to the International <br />Fire Code: Section 20.24.020 (Documents) notes the documents now adopted by <br />reference ;Section 20.24.030 (Amendments) notes local amendments to the 2007 <br />California Fire Code (CFC) is updated with the Building Code; Section 20.24.040 (Fire <br />Service Features) adds Emergency Communications Systems to specified buildings; <br />Section 20.24.050 (Building Services and Systems) defines portable un-vented heaters; <br />Section 20.24.060 (Immersion Heaters) is added for clarification regarding hazardous <br />uses; Section 20.24.070 is added to require emergency ventilation; Section 20.24.090- <br />100 (Fixed Guideway Systems) are required to meet local requirements for fire <br />protection ;Section 20.24.110 (installation of fire sprinkler systems) is added to address <br />particular commercial uses and create minimum design standards; Section 20.24.120 <br />(installation of fire sprinkler systems) is added because of exemption in national <br />standard; Section 20.24.130 (installation of fire sprinkler systems) is added because <br />4 <br />
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