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Wood Bridge

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We have designed a wood bridge for the navy project in San Diego. The   
bridge plan dimensions are 16 feet by 40 feet. The bridge is called Decon   
Bridge for washdown of the various trucks. The drawings indicate that all   
wood shall be pressure treated. The contractor is suggesting that the   
lumber should be sealed or painted before erection, and asking for the   
additional cost to the project.The bridge framing consists of wood beams   
(6x14) and decking (4x14) supported by concrete piers. Any comments will   
be appreciated.

Nutan S.