8M Consent 2011 0516 - Laserfiche WebLink

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CITY OF SAN LEANDRO APPROVED AND STAFF REPORT FORWARDED TO CITY COUNCIL DATE: May 16, 2011 tep en L. Hollister City Manager TO: Stephen L. Hollister, City Manager FROM: Uchenna Udemezue, Director Engineering and Transportation epartment BY: Kenneth Joseph, City Engine Engineering and Transportation Depai ent SUBJECT PROJECT/PROJECT DESCRIPTION: RESOLUTION OF AWARD OF CONTRACT TO REDWOOD ENGINEERING COMPANY FOR THE PREDA STREET PIPE BRIDGES UPGRADE PROJECT, PROJECT NO. 09 -593- 52 -121. SUMMARY AND RECOMMENDATION The subject project will repair damage to one bridge and seismically retrofit the two bridges and sanitary sewer pipelines that cross the San Leandro Creek at Preda Street. Staff recommends award of contract to the low bidder, Redwood Engineering Company, in the amount of $329,440.00 for the subject project. BACKGROUND Two sanitary sewer main pipelines pass beneath the Union Pacific Railroad tracks and cross San Leandro Creek on two parallel bridge structures near the northern end of Preda Street. The first bridge was constructed in 1938 and the second in 1973. A recent inspection of these facilities found one of the bridge structures damaged, possibly from a fallen tree or limb. Because of their age and their location across the environmentally sensitive San Leandro Creek, further investigation was conducted to determine the condition of the pipes and the bridge structures. The study identified several bridge components that need to be upgraded to meet current seismic loading conditions. Also, to reduce the risk of sewage leaking into the creek below, the pipes will be replaced with a joint locking system and Flex joint. These improvements will increase system reliability during a significant seismic event.