Title
Annual Contract for Coating System for Sanitary Sewer Manholes and Lift Stations (B)
Staff recommends establishing an annual contract for protective coating system installation for the rehabilitiation of sanitary sewer manholes and lift stations in the wastewater collection system.
Explanation
Water and Wastewater Systems staff regularly inspect sanitary sewer manholes and lift station structures to identify corrosion, infiltration or structural degradation of the systems to reduce the risk of potential spills. Based on the staff's assessment of the structures, a repair method is chosen to rehabilitate the interior surface area of existing manholes and lift stations. Staff typically targets the application of a protective coating system for approximately two lift station wet wells and twenty sewer manholes per year.
This contract will cover rehabilitation of interior concrete surfaces of existing sanitary sewer manholes and lift stations via the application of a protective calcium aluminate based cementitious product and/or a 100% solids epoxy coating system. The scope of work includes bypass pumping (if needed), removal of any existing deteriorated coating, preparation of the structure to be lined, repair of manhole cover frame assembly or invert channel, and furnishing and applying the specified coating material. The total cost for these services averages $135,000 annually.
An Invitation to Bid for this work was sent by Utilities Purchasing to the three known companies that perform this type of work, with two responding. Bids were evaluated based on the unit pricing for the various services. Dallas 1 provided the lowest overall unit pricing. Staff also evaluated the bids based on historical projects using the unit pricing which revealed the same results. A tabulation of the unit prices received is attached for your information.
Recommendations
The City Commission: 1) authorize the Interim General Manager, or her designee, to execu...
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