Prioritizing and Scheduling Roadways for Pavement Rehabilitation
The City of San Ramon has approximately 214 miles of streets to maintain. To ensure the safety of our roadways, the City’s Pavement Management Program (PMP) reviews the condition of every City-owned street and maximizes the number of streets that can be repaired based on available funding. Priority is given to the busier roadways (arterials and collectors), neighborhood areas with poor pavement conditions, streets that need full reconstruction, and streets eligible for slurry seal (a preventative maintenance treatment) that extends the life of the pavement.
The PMP includes the preparation of the Five-Year Pavement Repair Plan, updated annually as part of the City’s Budget Process. The basis of the Plan is the pavement condition survey performed biennially in which a Pavement Condition Index (PCI) is assigned to each street section (0-100). The Plan identifies the streets to be repaired, reconstructed, or slurry sealed within a five-year period. The Annual Paving Project is then developed and constructed each summer. This year, Bollinger Canyon Road and Crow Canyon Road near the I-680 interchanges and various residential streets were repaved; Montevideo Drive and Camino Ramon were slurry sealed.
The following information will provide some insight on the strategies that the City uses to prioritize and schedule streets for pavement rehabilitation.
First, to describe the pavement repair strategy, explanation of the following terms and definitions may be helpful:
Pavement Management Program - The City’s Pavement Management Program consists of the Annual Pavement Management Project and the Pavement Repair Stop Gap Project.
Annual Pavement Management Project - The annual pavement management project, which provides for the long-term scheduled maintenance of the City’s street network, is normally bid once a year with the construction contract ending upon completion of the scheduled work. The construction duration for an annual pavement management project typically takes approximately four months to complete.
Pavement Repair Stop Gap Project - The pavement repair stop gap project provides for immediate repairs of localized failed pavement that are a safety concern. The pavement repair stop gap is currently bid on a biennial basis and the construction duration is two years. Locations of failed pavement that are reported are compiled into a list and issued to the contractor in the form of a “Work Order” for repair throughout the contract period.
Pavement Condition Index (PCI) - PCI is a numerical index between 0 and 100 that is used to indicate the general condition of a pavement. It is widely used in transportation civil engineering. It is a statistical measure and requires field survey of the pavement.
Low PCI Roadways – If arterials, collectors, and residential roadways have a PCI of less than 50, 45, and 35, respectively, they are labeled as “Low PCI” roadways for pavement repair purposes and are eligible to receive a complete pavement reconstruction, a criteria that was established by the City to ensure that pavement sections that reach these PCI ratings are prioritized and addressed.
High PCI Roadways – If arterial or collector roadways have a PCI of 70 or more and residential roadway have a PCI of 65 or more, they are labeled as “High PCI” roadways for pavement repair purposes and are eligible to receive preventive maintenance treatment, i.e. slurry seal.
Neighborhood Areas – A neighborhood area is an area that consists of a subdivision development or a combination of subdivision developments delineated by either a collector or an arterial roadway. For pavement repair purposes, the neighborhood area is formed to provide pavement rehabilitation to a group of streets in a particular area.
Pavement Treatment Type – Different roadways or even different sections of a roadway may receive different pavement treatment depending on its pavement condition and its current PCI. In general, there are two types of pavement treatment: Preventive Maintenance Treatment and Pavement Rehabilitation.
FIVE-YEAR PAVEMENT REPAIR PLANAs part of the City’s Annual Budget review and approval process, a Five-Year Pavement Repair Plan is prepared and updated annually. The Pavement Repair Plan primarily contains five neighborhood areas from the prioritized neighborhood area list for the following five years, sections of prioritized arterials and collectors when there is funding available, low PCI roadways, and roadways eligible receiving preventive maintenance when there is funding available.
Individual roadways within the neighborhood area receive different treatment depending on the PCI values. For example, if a roadway within the neighborhood area has a PCI value over 65, the roadway will receive a preventive maintenance treatment; if another roadway within the same neighborhood area has a PCI value between 25 and 65, the roadway will receive either an overlay or an inlay; finally, if a roadway within the same neighborhood area has a PCI value of less than 25, the roadway will receive a complete pavement reconstruction.
In addition to the programming of the roadways into the Five-Year Pavement Repair Plan, any roadway section that has a severely localized damaged area and is waiting to be prioritized and programmed into the Five-Year Pavement Repair Plan can be repaired as part of the pavement repair stop gap project.