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3. EXISTING CONDITIONS 3.1 Existing Pavement and Soil Conditions All streets proposed to be improved were constructed in 1988 with bituminous pavement, class 5 aggregate base, bituminous curb, and bituminous curb cuts for storm runoff. However, during the Highway 10/Armstrong Interchange project the west end of 146th Avenue was reconstructed and a temporary cul-de-sac was constructed. The streets were constructed to a width of 40-feet from face -of -curb to face -of -curb. The streets are generally centered within a 66-foot wide right-of- way. The only pavement maintenance treatments applied to the street segments included crack sealing and seal coating in 1994 and 2001. Spot patching has been performed on an as -needed basis, and has been a yearly treatment recently. In 2017, Staff observed a PASER rating of 2 on 147th Avenue and Ferret Street, and a PASER rating of 7 on 146th Avenue. In June 2018 traffic counts were taken on 147th Avenue, a traffic volume of 147 average annual daily traffic (AADT) was recorded. Ferret Street and 146th Avenue would be expected to have similar traffic volumes. The only access to these street segments is Armstrong Boulevard. Five of the parcels have active uses. The speed limit is 30 mph for these street segments. Standard penetration test borings were performed by American Engineering Testing (AET) in 2022. AET's Report of Geotechnical Exploration is attached in Appendix D. Standard penetration test borings were performed by American Engineering Testing (AET) in 2021. 2.5 to 2.75 inches of bituminous pavement with 8 inches of apparent gravel base was encountered with silty sand and sand with silt layers encountered to depths of approximately 2 to four feet beneath existing grade. The sands with silt from 2 to 4 feet below grade were classified as "Course Alluvium or Fill." Groundwater was encountered at a depth of 10 feet in one of the borings. Previously, in 2017, Braun Intertec was employed to complete a ground penetrating radar (GPR) analysis for the project area, which included driving a GPR equipped vehicle throughout all street segments within the project area. A summary table and charts of the GPR Analysis are attached in Appendix C. The GPR data determined an average bituminous pavement thickness of 2.9 inches, and an average aggregate base thickness of 9.7 inches. The average street pavement and base section thickness is therefore 12.6 inches, with a minimum section of 7.5 inches located on 147th Avenue, 160 feet east of Ferret Street. 3.2 Watermain Watermain was installed along 147th Avenue up to the beginning of the proposed improvements in 2012 as part of the Sunwood Drive re -alignment project. The existing watermain is believed to be in good condition and no repairs are anticipated to be required as part of this project. However, Staff plans to leak test the watermain during development of plans and specifications. 3.3 Sanitary Sewer Sanitary sewer was installed under Armstrong Boulevard in City -owned right-of-way east of the 146th Avenue temporary cul-de-sac as part of the Armstrong Boulevard Interchange project in Feasibility Report Update West Armstrong Area Street Reconstruction City of Ramsey Project No. 18-02 Page 5