Agenda - Council - 09/22/2015 - Laserfiche WebLink

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CC Regular Session 4. 14. Meeting Date: 09/22/2015 By: Bruce Westby, Engineering/Public Works Information Title Adopt Resolution #15-09-228 Ordering Preparation of Assessment Roll and Calling for Assessment Hearing for Garnet Street and 168th Avenue Reconstruction; Improvement Project 13-10 Purpose/Background: Purpose: The purpose of this case is to adopt Resolution #15-09-228 ordering the preparation of an assessment roll and calling for an Assessment Hearing for Garnet Street and 168th Avenue Reconstruction; Improvement Project 13-10. Background: City of Ramsey Improvement Project 13-10 involves reconstructing two paved street segments including Garnet Street between 167th Street and the north plat line of Now & Then Estates, and 168th Avenue between Garnet Street and the west plat line of Now & Then Estates. The segment of Garnet Street to be reconstructed measures approximately 1,350 feet in length, and the segment of 168 th Avenue NW west of Garnet Street measures approximately 670 feet in length. The total length of these two street segments is approximately 2,020 linear feet, or 0.38 miles. A map showing the location and scope of both streets is attached as Figure 1. Existing Conditions Both streets were constructed in 1988 using bituminous pavement and curbing. The existing soils in this area are predominantly composed of a mixture of silty sands and clays which do not provide good structural support for pavements. No storm sewer or public utilities exist under the streets, with the exception of the north and south ends of Garnet Street where trunk water and sanitary sewer stubs exist, and a storm sewer culvert that exists under Garnet Street just north of 16Ch Avenue. Both streets have received one sealcoat application in 2006. Since both streets are relatively flat they were not able to efficiently shed stormwater runoff, resulting in stormwater runoff pooling on the pavement for extended periods of time which then strips oil from the pavement leading to accelerated degradation of the pavement. Both streets have a Pavement and Surface Evaluation Rating (PASER) of 1 ranking them as two of the worst streets in the City in terms of pavement condition. In fact, several areas of Garnet Street no longer have bituminous pavement and are instead paved with class 5 aggregate to allow the streets to remain in passable condition. Then each spring when the ground thaws the streets becomes extremely difficult to navigate and maintain due primarily to the poor underlying soils which become unstable when saturated with groundwater. Proposed Improvements Subgrade corrections were completed along both street segments to provide a uniform, stable subgrade base to ensure the new pavement sections can achieve a 60 -year design life with minimal maintenance. The subgrade corrections consisted of excavating 3 -feet of unsuitable subgrade materials and backfilling the voids with clean imported select granular borrow. Per the adopted Special Assessments Policy, the cost to correct unsuitable subgrade soils is not an eligible special assessment cost so these costs will be paid with City funds. Both streets were reconstructed to match the existing widths of 31 -feet from back -of -curb to back -of -curb. Concrete curb and gutter and storm sewer was constructed along both streets to better facilitate drainage and to protect the edges of the new pavement. Six-foot wide concrete sidewalks were constructed within City right-of-ways along the east side of Garnet Street and the north side of 168 th Avenue. The new sidewalk connects the existing 6 -foot