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ARDEN HILLS CITY COUNCIL WORK SESSION—OCTOBER 24, 2011 2 patching of the surface caused the PCI to increase to 62 in 2011. Likewise, Arden Oaks Drive was rated 79 in 2008 but due to delamination of the top lift of bituminous in many areas and reflective cracking through the overlay the 2011 rating dropped to 60. Old Snelling Avenue needs to be reconstructed while Arden Oaks Drive needs to have the delamination of the top lift of bituminous repaired and be put on the crack-filling/seal-coating schedule. The general areas of streets that still need to be considered for reconstruction are shown on the map by the areas of combined red (poor) and blue (marginal) colors. Public Works Director Maurer stated that since the City has invested so much capital into rebuilding the street infrastructure the past several years, it is important that the proper attention and resources be put into maintaining and preserving the rebuilt street infrastructure. Although often the Engineering profession refers to a street design as a 20 or 25 year design, it does not mean that in 20 or 25 years that street will need to be totally rebuilt. Concrete curb and gutter should easily last 50 years and beyond. If when a street is rebuilt it is sub cut and a granular material is imported for a better base, why would that ever have to be replaced? With the rapidly changing technologies for maintaining and persevering streets, once a street is properly rebuilt it may never have to be totally rebuilt again. Generally, a proper maintenance/preservation plan will include pothole repair, crack filling, seal coating and spot concrete repair. Over a longer period of time,mill and overlay or reclaiming of the bituminous surface will be necessary. Public Works Director Maurer explained that the crack-filling/seal-coating program staff would suggest is as follows: • Newly reconstructed or reclaimed bituminous surfaces be crack-filled and seal-coated after three years. • All other streets, except those still planned for reconstruction, be crack-filled and seal- coated on a seven year rotation. Streets in areas that see a much higher percentage of heavy commercial/industrial vehicles may need a slightly shorter rotation, say five years. • A program that would crack-fill those streets one year that are planned to be seal coated the next year. • Eventually, get to a system where the entire City is divided into sections where the crack- filling and seal-coating is programmed out in fiscally equivalent areas that complete the entire system over a seven year cycle. • Areas that are coming up for crack-filling would also be looked at for any concrete repairs that may be needed so they are completely ready the next year for seal coating. Public Works Director Maurer stated that the other issue that needs to be addressed in our street system is the bituminous delamination problem that has occurred on a few of our streets. This can be addressed by either spot milling and repaving if the problem is isolated or milling of the top lift of bituminous and overlaying where the problem is more wide spread. Public Works Director Maurer explained that from a budget perspective to crack-fill and seal- coat one-seventh of the total street system in 2012 would cost an estimated $135,000. This is the minimum amount, adjusted for inflation that should be budgeted yearly for maintaining the street infrastructure. Repair of the delamination issue discussed previously would be in addition to this amount. Staff recommends that it would be better to increase the budget for maintenance and