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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 />Steel plate installation shall be recessed by milling existing pavement to set flush with <br />finish 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 <br />3/4 inch <br />2 feet-7 inches <br />'/s inch <br />3 feet-5 inches <br />1 inch <br />5 feet-3 inches <br />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 />