I previously told you about some upcoming Seattle tunneling projects. Here now is a link to artist renderings of the new SR 520 floating bridge project, which will raise the existing bridge up above the pontoons, making space for maintenance works and storm water treatment and fire suppression utilities underneath: www.flickr.com/photos/wsdot/6871707294/in/set-72157629307832804/
The photo site has

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Performance bonds may provide better protection to an owner. Typically, the bond provides funds to pay for repair of defective work that may not be covered by insurance as part of the bond’s guarantee of the faithful performance of the contract by the contractor.