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BOOK 107 PAGE83 <br />Director to review the 1998 bridge inspection results for 67 <br />bridges in Indian River County. Six of the bridges received a <br />sufficiency rating less than 50 based upon a maximum score of 100 <br />(see attached list). Two of the bridges, No. 880056, the CR512 <br />bridge over Park Lateral Canal, and 880055, the CR512 bridge over <br />Lateral U Canal, are showing signs of settlement, piling damage, <br />and deck cracking. These bridges were rated 44.7 and 44.9 <br />respectively, and are not currently weight posted. Many large <br />agricultural trucks use the bridges, which were built around 1951. <br />ALTERNATIVES AND ANALYSIS <br />Alternative No. 1 <br />Staff has designed a temporary repair to fortify the <br />bridges. The plan involves driving six prestressed 18" <br />square concrete pilings along both sides of the bridges <br />(three each side) and using steel I -beams to support the <br />bridge decks in six locations. The cost for the six <br />pilings installed for each bridge is $27,353. The cost <br />for steel and installation is approximately $15,000 per <br />bridge(10/07/98 quote from Knight and Mathis, Inc.) The <br />total estimated cost is $42,353 per bridge. <br />The bridges would probably have to be closed for a <br />maximum of fourteen days each. It is possible that <br />driving the new piles close to existing piles will cause <br />damage or settlement to the existing bridge. If this <br />does occur, the new piles and beams should support the <br />weakened piles. This alternative would be a short term <br />solution. Repair could take place in December 1998. <br />Alternative No.2 <br />Another alternative would be to replace each bridge with <br />a new precast concrete bridge. Since the existing <br />bridges are almost 50 years old, they have served their <br />design life. The bridge contractor that is currently <br />building the Kings Highway bridges suggested that the <br />County initiate a design/build project on an emergency <br />basis to replace both bridges. The cost would be <br />approximately $400,000 per bridge or $800,000 for both <br />structures. This alternative would provide a long term <br />solution. Construction could take place in May, 1999. <br />Staff prefers Alternative No. 2. Funding would be 50% from <br />Local Option Sales Tax Revenue and 501% from Local Option Gas Tax <br />Revenue. In the interim, staff may have to weight post the bridges <br />at 10 tons. <br />ATTAC� <br />1) Written Quote form from Murphy Construction co. dated 10/06/98 <br />2) Sufficiency Rating from Kisinger, Campo & Assoc. dated Sept. <br />15, 1998 <br />3) Drawings of bridge replacement at CR512/Lateral U and <br />CR512/Park Lateral Canals <br />October 20, 1998 <br />;.1 <br />