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KITTITAS COUNTY <br />DEPARTMENT OF PUBLIC WORKS <br />PUBLIC WORKS — BOARD OF COUNTY COAINHSSIONERS <br />STUDY SESSION STAFF REPORT <br />STUDY SESSION DATE: November 9, 2020 <br />TOPIC: Big Boulder Final Construction Report <br />ACTION REQUESTED: None required — informational briefing <br />LEAD STAFF: <br />Mark R. Cook <br />RECOMMENDATION: <br />None required — informational briefing only. <br />BRIEFING SUUIMARY: <br />• Original 40 foot poured in place concrete abutments engineer's estimate was <br />$749,227. <br />• Final construction costs including the temporary 40 -foot bridge for maintaining <br />access for one year, along with the final 60 -foot bridge, total $741,466.58. <br />• Public Works now has a 40 -foot temporary metal girder steel bridge in our <br />inventory for emergency flood fight or for support of capital construction projects. <br />BACKGROUND: <br />During the summer of 2018 Public Works became aware of a failing wood bridge <br />structure on Fish Lake Road and Big Boulder Creek from a United States Forest Service <br />bridge inspection report. Public Works immediately load restricted the bridge and <br />engaged KPFF towards design of a replacement bridge. The resulting design engineer's <br />cost estimate was for $749,227. Constructability concerns (remote location) resulted in <br />no contractor submitting bids for constructing the project as designed. Public Works, <br />working with KPFF engineers, designed a temporary deployment of the 40 -foot metal <br />girder bridge procured for the original design allowing winter traffic (2019-2020). A <br />project re -design resulted in a longer bridge (60 -foot) on a precast concrete foundation. <br />The engineer's cost estimate for the redesigned structure was $342,150. <br />DISCUSSION: <br />All construction costs, including regrading of the road supporting bridge delivery and <br />project inspection and administration costs total $741,466.58. This represents 99% of the <br />engineer's original project cost estimate. Importantly, in addition to replacing the failed <br />wood bridge, Public Works now has an additional 40 -foot metal girder bridge in its <br />Equipment Rental and Replacement program. <br />Page 1 of 3 <br />PUBLIC WORKS BOARD OF COUNTY COMMISSIONERS WORK SESSION STAFF REPORT <br />