Agenda - Council - 04/11/2017 - Laserfiche WebLink

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3. EXISTING CONDITIONS 3.1 Existing Pavement and Soil Conditions The four street segments were constructed in 1985 with 2 to 3.5 inches of bituminous pavement, 4 inches class 5 aggregate base, B618 concrete curb and gutter, and concrete storm sewer. The street was constructed to a width of 40 feet from face-of-curb to face-of-curb, and is centered within an 80 foot wide right-of-way. Delineated parking lanes exist along both sides of the street. The existing posted speed is 35 mph along this entire segment of Rivers Bend. The storm sewer system consists of numerous catch basins which drain runoff from the street to adjacent low-lying areas using concrete storm sewer pipes. The pavement was cracksealed and sealcoated in 1988 and 1995, and spot patching has been applied on an as-needed basis since. In 2016, Staff observed Pavement and Surface Evaluation Ratings (PASER) of 3 on all street segments. While truck counts for these streets are not available, Staff believes it is reasonable to assume the average annual daily traffic (AADT) count is less than 1,000 vehicles, and that less than 5 percent of vehicles using these streets can be classified as truck traffic. WSB and Associates (WSB)was employed to complete a total of twelve pavement corings. Their results showed an average bituminous pavement thickness between 2 and 3.25 inches, which was constructed over 4 inches class 5 aggregate base. 3.2 Watermain Watermain was installed under all street segments in Rivers Bend. Staff believes the existing watermain is in good condition, and that no repairs will be required prior to reconstructing the pavement. However, if plans and specifications are ordered for the proposed improvements, staff proposes to hire a leak detection expert to ensure there are no detectable leaks. If leaks are detected,repairs would be made under separate contract before work commences on this project. Leak detection testing is estimated to cost $500. 3.3 Sanitary Sewer Sanitary sewer was installed under each of the street segments in Rivers Bend. Staff believes the existing sanitary sewer is in good condition, and that no repairs will be required prior to reconstructing the pavement. However, if plans and specifications are ordered for the proposed improvements, staff proposes to hire a firm to televise the sewer to ensure the pipes are not deformed, cracked, or broken, and that all joints are sealed. If any issues are detected, repairs would be made under separate contract before work commences on this project. Sewer televising for this project is estimated to cost$2,800. 3.4 Storm Sewer/Drainage Storm sewer exists along Xkimo Street. Based on design calculations completed by City staff, no modifications will be required to the existing storm sewer system. Feasibility Report Rivers Bend Street Reconstructions City ofRamsey Project No.I7-02 Page 4