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r. Steve Gallup f U N S U !TIN 6 <br /> • arch 2, 2004 ~ f N 61 N f f A S <br /> . ~ Page 2 <br /> <br /> ~r Under this phase OBEC will prepare limited plans and specifications that will assist the City with <br /> obtaining a crack injection contractor. Bidding for this work will be limited to obtaining price quotes <br /> from a minimum of three qualified injection contractors. We will provide additional inspections of Spans <br /> 1, 5, and 6, as these were not done previously because of traffic on Club Road and the locked fencing in <br /> Span 1. We will include traffic control for inspection and repair work on Club Road and the bike paths at <br /> both the north and south bike trails. OBEC will provide construction inspection during the crack injection <br /> work, four follow-up inspections at approximately three-month intervals, and re-load rating with 90 <br /> percent concrete shear value. <br /> Phase 2 - Design Engineerin¢ <br /> The reason for the shear cracking can be attributed to under-reinforcing for shear during the original <br /> design. 1'he crack injection program in Phase 1 only addresses the immediate restoration of concrete <br /> shear capacity at crack locations, but does not address the lack of reinforcement. The potential is high <br /> that additional cracks will appear near the injected cracks if load conditions aze similar to those that <br /> initiated the original cracks. <br /> This next phase of engineering will investigate options for increasing the shear capacity at critical <br /> locations by adding external or internal reinforcing. Several methods are available for consideration, such <br /> as external post-tensioning, externally bonded FRP systems, internal steel reinforcing, and external steel <br /> reinforcing. Each of these methods will be investigated and a Preliminary Design Report submitted that <br /> will outline the pros and cons of each system, make recommendations for implementation, and provide <br /> cost estimates for comparisons. Following review and approval by the City, OBEC will then develop <br /> final plans and bid documents suitable for competitive bidding. <br /> Phase 3 -Construction Engineering <br /> OBEC will provide construction inspection and contract administration as requested by the City. No <br /> budget amount is estimated at this time because the recommended repair is not known. During Phase 2, <br /> when the repairs are known, OBEC will submit a budget amount for consideration as an amendment to <br /> our original agreement. <br /> As stated previously, our estimated budget is attached for your review. The not-to-exceed amount for <br /> Phases 1 & 2 is $81,100 and will be billed per our standard Schedule of Fees. If this proposal meets with <br /> your approval, please develop a contract for signatures. We are prepared to start immediately upon your <br /> written notice-to-proceed. <br /> Sincerely, <br /> Gayle D. Harley, P.E. <br /> President and Chief Construction Engineer <br /> GDH/mlh <br /> Enclosures <br /> <br />