R96-111 ACCEPTING BID AND AUTHORIZING CONTRACT (Street Reconstruction)

Home Browse Search

, , . ' f �of.Df c� c V 7e '/[LtNO�S August 26, 1996 PUBLIC WORKS MEMORANDUM NO. 96-56 MEMORANDUM TO: Honorable Mayor and City Council FROM: William B. Sands,Interim City Manager � Bruce A. McNabb,Director of Public Works� Stephen P. Swanson, City Engineer� SUBJECT: Street Reconstruction City Project 9624 This year's Street Reconstruction Program includes the cold mix recycling of non-curbed local streets and a pilot project for the reconstruction of Stone Street from Lawrence Street to Johns Avenue. The cold mix recycling is a continuation of a process the City has used over the last several years to reconstruct local non-curbed streets. This process basically involves pulverizing the existing roadway and adding aggregate and bituminous material to form a new base. The new base is "cured" for a year and paved the following year. This allows any base failures that appear to be repaired in advance of the final pavement surface being placed. The cold mix recycling process has not been used on the City's older curbed local residential streets. These streets have, over the course of their lifetime, received multiple layers of surface treatments and/or overlays. Each succeeding layer has reduced the available gutter depth by the thickness of the surface treatment or overlay. The available gutter depth on most of these streets has become two inches or less, such that the curb has lost most of its functional purposes (i.e. drainage control, access control, pavement edge delineation, delineation of non-vehicular travelways, aesthetics, roadside management, etc.). The loss of these functional purposes contributes to the deterioration of the adjoining pavement structure. The application of the current cold mix recycling process would not correct this problem and would only worsen the situation.