10-05-2020 Council Work Session Packet

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Michael Grochala and Diane Hankee September 2, 2020 Page 2 S:\Community Development\Projects\Capital Improvement Projects\2021 Street Rehab and Recon\Staff Reports\20201005 WS Pavement Management and 2021 Projects\5. 2020.09.02.Lino Lakes PMP.DOCX Please note in this picture that there are minimal cracks and essentially no patches which greatly reduces maintenance efforts by public works crews. The primary goal of this program is to increase the longevity of each street to 50-60+ years - thereby making the program extremely cost effective. For years I have been recommending that cities refrain from seal coating due to these delamination issues, and instead use this money towards building a thicker bituminous road section – 4.5 to 5 inches thick preferably. A thicker road section will obviously be stronger and last many years longer than a thinner section. As mentioned, a thicker bituminous section also provides more options for cost effective maintenance procedures. A thicker bituminous section is very easy to mill and overlay multiple times versus a thin bituminous section. It sometimes is not even possible or advisable to mill a thin bituminous section. The City of Lino Lakes recently updated their standard road section to include a thicker bituminous section - 4.5 inches. With this thicker section, the city will now be able to effectively use mill and overlays for future maintenance efforts. When doing a mill and overlay, the top 1.5” or 2” will be removed and the remaining bituminous will provide a good structural base for the new blacktop surface. Currently, the City of Lino Lake’s mill and overlay/ street rehabilitation program has included full depth mill and overlays/ reclamations because the existing road sections are not thick enough to complete a standard mill and overlay. This additional expense reduces the amount of roadway linear footage the City can maintain within its annual budget. Another benefit of a thicker bituminous section that I reviewed and discussed recently with the Cities of Minnetrista and Champlin is the cost impact to developers. Although a thicker bituminous section costs more upfront to construct, a thicker section can actually lead to a cost savings for developers over the long term, or at a minimum, no net cost increase. A thin bituminous section typically requires developers to only install a 2-inch base before they are allowed to begin building homes. City of Lino Lake’s Ordinance requires that 70 percent of homes be constructed before the wear course may be installed. When it comes time to install the wear course in this situation, portions of the 2-inch base course needs to be replaced before they are allowed to pave the wear course. With a thicker bituminous section, developers install a 3- inch base course prior to home construction. This 3-inch section provides a better base structure for building construction resulting in the developer replacing less base course before paving the wear course.