R2009-98 ACCEPTING THE BID AND AUTHORIZING A CONTRACT

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� � Public Works Memorandum NO. 2009-40 DATE: June 4, 2009 TO: Honorable Mayor McElroy and City Council FROM: R an P. McCrad Ci Mana er �'" � Y Y� tY g Richard G. Marley, P.E., Public Works Director ��`�' G�' � SUBJECT: Street Reconstruction, City Project 09-24 SUMMARY RECOMMENDATION: It is recommended by staffthat the City Council approve the attached resolution awarding the contract for Street Reconstruction, City Project 09-24, to Dunn Company, A Division of Tyrolt, Inc., as the lowest, responsible bidder in the amount of$735,311.16, and that the Mayor be authorized to execute the contract, and the City Clerk to attest. BACKGROUND: Prior Council Action On March 28, 2009, in Study Session for the Capital Improvement Plan review, City Council received maps and location tables identifying streets recommended for improvement during 2009. The Street Reconstruction Project is an annual street improvement project for the City. Streets Inspected Annually The Engineering Division inspects and rates approximately 1/2 ofthe City's streets on a yearly basis. The results of these inspections are input into a computer database which is used to ' project the future condition of the streets based on their current condition, historical condition, surface type(i.e. brick, concrete, asphalt, etc.), average daily traffic, and traffic type (i.e. trucks, cars, etc.). This data is then paired with available funding and is used as a basis to aid City Engineering in the preparation of the City's yearly street improvement program. Staff then determines which streets need to have the surface restored or be totally rebuilt. Project Description This year's Street Reconstruction Project generally involves the placement of a 1 to 2 inch asphalt surface course on an existing paved surface. A portion of the existing pavement is often milled offto reduce the impact of the overlay on existing curbs and driveways. If additional structural capacity is desired in the pavement, no milling may take place prior to the overlay. This year microsurfacing and cape seal pavement improvement processes have been added to the annual project. These processes further extend pavement life and delay the need for more expensive mill and overlay work. Microsurfacing places a thin, bituminous slurry on the surface of the pavement that cures to create a smooth durable surface. A cape seal consists of placing a traditional oil and chip surface prior to placing the smooth microsurfacing top coat. When performed at the right time, microsurfacing and cape seal treatments can last up to 10 years. Page � 1