Agenda - Council - 01/13/2015 - Laserfiche WebLink

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Stormwater Improvements: Stormwater improvements are proposed to include new concrete curb and gutterand new storm sewer infrastructure including concrete catch basins and pipe sewers.Some 6” pipe drain will also be added along the outside edges of subgrade corrections at the low point to ensure adequate subgrade drainage. No stormwater ponding improvements are currently proposedwith the project but the opinion of probable costs includesa contingency cost of $40,000 for stormwater ponding in case the Lower Rum River Watershed Management Organization requires ponding with the project. th 4.1.2168Avenue th Similar to Garnet Street, 168Avenue will be reconstructed with bituminous pavement and concrete curb and gutter to maintain its current width of 31 feet from back-of-curb to back-of-curb. Figure 1in Appendix A The proposed surface improvements are shown on . Pathway/Sidewalk: th A new sidewalksegment isproposed to be constructed along the north side of 168 Avenue to connect to the new concrete sidewalk located along the east side of Garnet Street. Figure 2in Appendix A. Existing pedestrian facilities are shown on Street Design: th 168Avenueis currently an urban residential street with bituminous curb and pavement 31 feet in width from back-of-curb to back-of-curb. Existing and proposed traffic counts are consistent with typical residential streets. th 168Avenue is proposedto be reconstructedmaintaining its current width of 31 feet from back-of-curb to back-of-curb. NTI recommends a pavement section of 6” class 5 aggregate base, 2” bituminous base course, and 1½” bituminous wear course. However, the City’s standard residential street pavement section is 4” class 5 aggregate base, 2” bituminous base course, and 1½” bituminous wear course. Based on the low traffic volumes on these streets, staff recommends using the City’s standard residential street pavement section. NTI recommends completing a 12” minimum subgrade correction by scarifying and re- compacting existing poor subgrade soils, then test rolling the corrected soils after and checking for poor or unsuitable areas and making spot corrections as needed. NTI recommends also adding sub-drain pipealong the outside bottom edges of subgrade on all streets andplugging the drain pipe into storm sewer catch basins.However, NTI also suggests there will be a long-term potential for differential settling of the streets if the existing subgrade soils are scarified and re-compactedas per their recommendation. Feasibility Report th Garnet Street and 168Avenue Reconstruction City of RamseyProject No. 13-10 Page 10