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2015 Bridge Program Contract No. 10-022-1560 <br /> Supplement No. 17 <br /> Discretionary Work Request for King County Road Servicc3 <br /> FORM A <br /> City of: Tukwila Request Number: TK-012 SUPPLEMENT#1 Date: 04/21/2015 <br /> Problem Description: The concrete approach span on the west end of the 196th - 200th Street <br /> Bridge over the Green River is undergoing unanticipated movement due to subgrade <br /> settlement. The slab is unsupported for approximately five feet at the slab/abutment interface <br /> by design. The slab seat concrete is spalling and steel reinforcing dowels are yielding as the slab <br /> rotates about the fixed slab seat. In addition, the concrete sidewalks approaching the bridge are <br /> bucking due to the pressure being exerted on them by <br /> Nature of Request: Tukwila requests inspection and design assistance from King County Roads <br /> Services. This work also includes King County Bridge Maintenance assistance to remove existing <br /> timber falsework left from the bridge construction that is preventing inspection of the damaged <br /> west approach slab seat. Once an inspection has been completed, Tukwila requests design <br /> assistance to choose a repair option and prepare the necessary plans, specifications, and <br /> estimates. <br /> It has been determined that additional work and equipment rental is necessary to safely <br /> access the work area beneath the damaged approach slab.The work consists of installing <br /> scaffolding for safe access to perform the necessary repairs and making monthly payments <br /> for approximately one year. <br /> Fiscal Impact: $7,000.00 <br /> Location: 0.8 Miles west of SR181 <br /> Attachments: Estimate provided by King County Roads Division. <br /> City Priority: High <br /> City Project Manager-Telephone Number: Grant Griffin - (206) 431-2446 <br /> Authorized By: Robin Tischmak Date: 06/05/2014 <br /> CITY OF TUKWILA <br /> 4'1 I -X( / <br /> 4._ 14-443_45 <br /> Mayor Haggert•fj <br /> Form A Page 1 of 1 <br />