CCP 06-12-2006 - Laserfiche WebLink

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. . . May 15,2006 5 elP Discussion Civil Engineer Kris Giga provided the City Council with of an overview of the GoodPointe Technologies report, Ms. Giga also provided the City Council with an overview of the following slreet maintenance practices and proccdurcs: Seal Coat-A seal coat is one of many types of surface treatment used in street maintenance. A seal cmt is an application of asphalt emulsion followed immediately with an aggregate cover. Seal coat can waterproof the surface, provide low severity crack sealing, and restore surface metion, Seal coaling can be perfonned at any time during the life of pavement and lasts an avcrage of three to six years, The prim<lry purpose of seal coating a street is to protect the street fTOm deterioration caused by sun and water. A seal coat provides a waterproof membrane that keeps the pavement from becoming brittle and cracking. Mill and Overlay-There are several maintenance practices that involve milling. An edge mill typically consists of grinding the old bituminous surface along the outer eight feet of the street. This helps establish a unitann cross-section, especially in instances where the crown in the street is relaLvely flat. A full width mill or resurfacing is necessary when the upper surface layer of a pavement has deteriorated considerably, A full depth milJ can be used on a street that has already been reconstructed with a good base section, but the pavement has deteriorated to a point where seal coating or a standard mill and overlay is not cffective, A pavement section with significant cracking will end up reflecting through thc new pavcmcnt. The full depth of the pavement is ground up and removed. This process may also involve some sub grade soil corrections and some removal of aggregate base, if it has been contaminated or is sub-standard. The street is paved with the same thickness of new asphalt. Reconstruction- When a street is fnlly reconstructed, the existing asphalt and base are completely removed and replaced, Reconstruction may also involve sub-grade soil corrections, For streets lhat do not meet current design standards for width, curb and gutter, and drainage, an upgrade may be necessary, Based upon the City's previous five year capital improvement program, GoodPointe Technologics provided the City with four financial analyses using the following scenarios: Scenario I-The City would spend $1 million dollars per year on street improvements over the next twenty years. The existing five year CIP has been incorporated into the first five years of the model. Over the next twenty years, the average PCI would increase from 64 to 77. Sccnario 2- The City would try to maintain a PCI rating of 64 and project the level of funding over the next twenty years to maintain this rating, The streets are selected by the program for maintenance on an as needed basis, The results of this scenario indicate that approximately $14,5 million will need to be budgeted for pavement management over the next 20 years.