Agenda - Council - 04/14/2020 - Laserfiche WebLink

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3. EXISTING CONDITIONS 3.1 Existing Streets Variolite Street between Alpine Drive and 173'd Avenue was constructed between 1981 and 1983 with bituminous pavement, class 5 aggregate base, and ditches. The street functions as a north - south collector. The west side of the street cuts across 6 plats and 3 un-platted sections, while the east side cuts across 7 plats and 2 un-platted sections. The existing right-of-ways vary from approximately 80-feet to approximately 100-feet. The street is generally straight, yet meanders within the right-of-way. The pavement width is generally 40-feet. Northbound right turn lanes exist for access to the Woodlands and Sweet Bay Ridge neighborhoods. Pavement maintenance operations have included crack seal and seal coat improvements in 1988, an overlay in 1998, and crack seal and seal coat improvements in 2008. Spot patching has been performed on an as -needed basis, and has been a yearly treatment recently. In 2018, Staff assigned a Pavement and Surface Evaluation Rating (PASER) of 4 to this segment of Variolite Street. PASER ratings were not completed for this street in 2019. PASER ratings are a numerical index between 1 and 10 indicating the condition of a pavement based on various pavement distresses present during visual observations. A PASER value of 10 represents a new pavement section, while a PASER rating of 1 represents a failed pavement section requiring reconstruction. A street segment summary is included in Appendix C. In June of 2019, Staff took 3 traffic counts on Variolite Street as part of the 2019 MnDOT State Aid traffic count schedule. • Variolite Street south of 173rd Avenue: 685 ADT • Variolite Street north of 161st Avenue: 1,420 ADT • Variolite Street north of Alpine Drive: 1,584 ADT The speed limit of Variolite Street is 50 mph, with the exception of a section north of Trott Brook which has a reduced speed limit of 45 mph due to severe localized vertical displacement of the pavement. In 2017, Braun Intertec was employed to complete a ground penetrating radar (GPR) analysis for numerous City streets, including this segment of Variolite Street. The GPR data determined an average bituminous pavement thickness of 6.8 inches, and an average aggregate base thickness of 5.6 inches. The average pavement plus base section thickness was 12.4 inches, with a minimum section of 8.5 inches located 150 feet south of 171st Avenue. It should be noted that the GPR was not able to determine aggregate base depth for an 800 foot section of the road near 166th Avenue. A summary table and charts of the GPR Analysis are included in Appendix C. 3.2 Subsurface Conditions 3.2. a Geotechnical Report Northern Technologies Inc. (NTI) was employed to complete a Geotechnical Exploration Review for this project, which included a total of sixty one (61) soil borings. The soil borings were spaced Feasibility Report Variolite Street Reconstruction City of Ramsey Project No. 20-01 3