Authorization to Release a Request for Proposals for the Rehabilitation of Sewer Manholes throughout Culver City. City of Culver City California City Council Agenda Item Report Meeting Date: February 05 2007 Item Number: C 2 AGENDA ITEM: Authorization to Release a Request for Proposals for the Rehabilitation of Sewer Manholes throughout Culver City. Contact Person/Dept.: Eric Mirzaian Public Works Maintenance Operations Fiscal Impact: Yes Public Hearing: Public Notification: Master Notification List on (01/31/2007) Action Item: Phone Number: (310) 253 6410 x No General Fund: Yes No X Attachments: X Department Approval: Charles D. Herbertson (01/23/07) City Controller Approval: Marlee Chang (01/30/2007) RECOMMENDATION: City Attorney Approval: Heather Iker (01/29/2007) City Manager Approval: Jerry B. Fulwood (01/30/2007) Staff recommends that the City Council authorize the Public Works Department to release a Request for Proposals (RFP) for the rehabilitation of approximately 125 sewer manholes throughout Culver City. BACKGROUND: Public Works Staff has identified approximately 125 sewer manholes throughout the City in need of rehabilitation. The sewer manhole is the access way from the manhole lid on the surface of the street leading down to the sewer main. The rehabilitation will include the rehabilitation of existing concrete or brick sanitary sewer manholes to rebuild strength and eliminate possible infiltration outflow root intrusion and future deterioration of the concrete and brick due to the sewer environment. DISCUSSION: Sewer manholes deteriorate for a variety of reasons. The constant stress of traffic causes subsidence and shear cracks which progressively weaken these structures. Additionally disintegrated mortar joints become primary entry points for ground water infiltration washing out supporting back fill and causing manhole walls to collapse. Corrosive sewer gases found in sewer lines attack concrete walls deteriorating the concrete and causing structur...
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