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CITY OF SANTA ANA <br /> SPECIFICATIONS <br /> PROJECT NO.: 25-6030 <br /> TRAFFIC SIGNAL INSTALLATION AT SEGERSTROM AVENUE AND ROSEWOOD <br /> AVENUE <br /> 5-7.8.3 Installation <br /> Add the following to this subsection: <br /> The following shall apply: <br /> 1. Steel plate installation shall be recessed by milling existing pavement to set flush with <br /> fmish grade. <br /> 2. Steel plate shall fit snug and installed to operate with minimum noise. Bridging shall be <br /> secured against displacement. <br /> 3. Steel plate used for bridging must extend a minimum of twelve(12")inches beyond the <br /> edge of the trench. <br /> 4. The pavement shall be cold planned a depth equal to the thickness of the plate and to a <br /> width and length equal to the dimensions of the plate. <br /> Multiple steel plates shall be butted and tack welded as needed to secure plates 6" minimum. The <br /> trench shall be adequate to support the bridging and the traffic load. Contractor shall be <br /> responsible for determining whether shoring is necessary. The Contractor shall be responsible for <br /> the appropriate selection and maintenance of the steel plates, and shoring. <br /> Unless specified, steel plate bridging at any given location shall not exceed four (4) consecutive <br /> working days in any given week. Backfilling of excavation shall be covered with a minimum of <br /> three(3)inches of temporary layer of cold asphalt concrete. <br /> The following table shows the required minimal thickness of steel plate bridging for a given trench <br /> width: <br /> Trench Width Minimum Plate Thickness <br /> 1 foot-11 inches ' inch <br /> 2 feet-7 inches 7/8 inch <br /> 3 feet-5 inches 1 inch <br /> 5 feet-3 inches 1 3/4 inch <br /> A Rough Road sign(W8-8)with black lettering on an orange background shall be used in advanced <br /> of steel plate bridging. This is to be used along with any other required construction signing. <br /> 16 <br />