Agenda - Public Works Committee - 09/19/2017

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3.EXISTING CONDITIONS 3.1Existing Pavement and Soil Conditions As-built record drawings show that the segment of Sunwood Drive betweenRamsey Boulevard/ CSAH 56 and Bunker Lake Boulevard/CR 116was constructed in 1996 using3.5 inchesof bituminous pavement, 5 inches of 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 Sunwood Drive. 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. In 2002 and 2008 the pavement was cracksealed and sealcoated, and spot patching has been applied on an as-needed basissince.In the fall of 2016, this segment of Sunwood Drive was rated with PASER ratings of 3 between Bunker Lake Boulevard/CR 116and Jaspar Street,and 4 between Jaspar Street and Ramsey Boulevard/CSAH 56. In 2015,City Staff recorded an average annual daily traffic volume of 3,500 (AADT). While truck counts are not available, Staff believes it is reasonableto assume between 5 and10percent of vehicles using this street segment can be classified as truck traffic, and that the percentage of trucks using this corridor mayincrease over time due to current business expansion projects and since several undeveloped but developable parcels exist along thecorridor. Northern Technologies, Inc. (NTI)was employed to complete a Geotechnical Exploration and Engineering Review for this project, includingeleven (11)soil borings spaced approximately 200 feetapart along Sunwood Drive.The locations of the borings are shown in the Boring Appendix D. Location Diagram in Appendix Cof NTI’s report, attached in The NTI soil borings provide information on existing bituminous pavement and aggregate base course thicknesses,subsurface soil conditions, existing ground water elevations, and potential issues that may beencountered during construction. All soil borings terminated at anominal depth of 11feetbelow the existing ground surface.Groundwaterwas observed inall soil boringsat depths ranging between 7and9.5feet belowtheexisting groundsurface.Basedonthe work proposed and the recorded water leveldepths, groundwater is not anticipated to be anissue for work completed with thisproposed project. The soil borings generally indicate that existing bituminous pavement thicknessesrange between 4.3to 8.3inches, with an average thickness of around 5 inches. Apparent aggregate base was not observed inany of the boring locations. Previously placed fill soils, generally consistingof poorly graded sand with silt (SP-SM), are present at depths ranging from 2.0 to 7.0 feet below the top of the pavement.Native alluvial soils consisting of poorly graded sand (SP), silty sand (SM), and poorly graded sand with silt (SP-SM) generally extend to the bottom of the borings. WSB and Associates (WSB) was employed to complete atotal of four pavement corings.Their results showed an average bituminous pavement thickness of close to 5inches, constructed over aclass 5 aggregate base. Feasibility Report Sunwood Drive Reconstruction City of RamseyProject No. 17-00 Page 4