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HomeMy WebLinkAbout2016-01-25 PACKET 09.2.Cottage Grove here Pride and prp59erity Meet To: Planning Commission From: Ryan Burfeind, Project Engineer Date: January 20, 2016 Re: Planning Commission Request — Pavement Management CIP & 2028 Pavement Management Project Background At their December 21, 2015 meeting, the Planning Commission reviewed the 2016-2020 Capital Improvements Plan (CIP). Part of this review included the 2016-2029 pavement management plan. At the meeting, the difference in street ages of a portion of the 2028 pavement manage- ment area was identified, with additional information requested on the reason for these streets being included as part of the same project. The area of the 2028 pavement management project in question can be seen in Figure 1 below and includes the residential streets north and west of 80th Street and Keats Avenue. Figure 1 — Excerpt from the 2016 — 2029 Pavement Management Map Planning Commission Pavement Management CIP — 2028 Pavement Management Project January 20, 2016 Page 2 of 3 Discussion The area of the 2028 Pavement Management Project in question includes the streets in the C4 pavement management district. The C4 district includes the streets in the East Parkview 6th Addition and Pine Forest 4th, 5th, and 6th Additions. The streets in the East Parkview 6th Addi- tion were originally constructed in 1993. The streets in the Pine Forest 4th, 5th, and 6th Additions were constructed from 1998 to 2000, as much as seven years later than in East Parkview 6th Addition. The subdivision map in Figure 2 below highlights the developments in question along with the year of construction. Figure 2 — Subdivision Map The streets in C4 were included as a single pavement management district as part of the Infra- structure Management Task Force (IMTF) planning process. The IMTF, and current pavement management planning, group streets together based on age as well as geographic location. In 2028, the streets in this area will have a range of ages from 28 to 35 years old. A review of more recent pavement management projects shows this to be the typical range of street ages for a project. To the maximum extent practicable, streets of similar ages are grouped together for reconstruction as it is more cost effective to complete rehabilitation work in this manner. Streets ranging from 28 to 35 years old will typically require a full pavement replacement. This is particularly the case if the form of deterioration known as stripping is present, which can be thought of as a "drying out" of the pavement where the asphalt separates from the aggregate. Stripping in the pavement causes delamination of the top surface, which results in shallow pot- holes that can expand rapidly if not maintained. LUW 77TH STS 77TH ST S C W Pine Forest Q LU 4th Addition iT 7998 z j Y Pine Forest 6th Addition < 1999 East Parkview ®� y 6th Addition 1993 P Pine Forest 6th Addition MA46 2000 1. Street JOCELYN VE CO J P Figure 2 — Subdivision Map The streets in C4 were included as a single pavement management district as part of the Infra- structure Management Task Force (IMTF) planning process. The IMTF, and current pavement management planning, group streets together based on age as well as geographic location. In 2028, the streets in this area will have a range of ages from 28 to 35 years old. A review of more recent pavement management projects shows this to be the typical range of street ages for a project. To the maximum extent practicable, streets of similar ages are grouped together for reconstruction as it is more cost effective to complete rehabilitation work in this manner. Streets ranging from 28 to 35 years old will typically require a full pavement replacement. This is particularly the case if the form of deterioration known as stripping is present, which can be thought of as a "drying out" of the pavement where the asphalt separates from the aggregate. Stripping in the pavement causes delamination of the top surface, which results in shallow pot- holes that can expand rapidly if not maintained. Planning Commission Pavement Management CIP — 2028 Pavement Management Project January 20, 2016 Page 3 of 3 As the City begins the feasibility report process leading up to a given project, more in depth testing and assessments are completed to determine the pavement condition throughout a pro- ject area. The 2013 Pavement Management project, for example, only had a mill & overlay completed on the newer streets, with a full pavement replacement on the older streets. Streets in the 2013 project had a range of ages from 21 to 34 years old. The various forms of testing and assessment will determine the structural condition of the pavement and identify any failures, which will be used to determine the rehabilitation method required for the streets in District C4. Staff will continue to monitor the streets in this district for deterioration until the reconstruction project occurs. Maintenance will be completed as needed to ensure the streets remain in a safe and drivable condition.