Agenda - Council - 04/28/2015 - Laserfiche WebLink

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City of RAMF Cur Missltim: Tr, wort together ko respotibiy grow our community, and to provide quality, cost-effective, and efficient government services. CC Regular Session 7. 1. Meeting Date: 04/28/2015 By: Bruce Westby, Engineering/Public Works Information Title: Adopt Resolution 15-04-087 Approving Plans and Specifications and Authorizing Advertisements for Bids for Garnet Street and 168th Avenue Reconstruction, Improvement Project #13-10 Purpose/Background: Purpose: The purpose of this case is to approve final plans and specifications and authorize advertisements for bids for Garnet Street and 168th Avenue Reconstruction, Improvement Project #13-10. Background: City of Ramsey Improvement Project 13-10 proposes to reconstruct Garnet Street between 167th Street and the north plat line of Now & Then Estates, and 168th Avenue between Garnet Street and the west cul-de-sac. The segment of Garnet Street to be reconstructed measures approximately 1,350 feet in length, and the segment of 168th 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 the proposed improvements on these two streets is attached. Existing Conditions Both streets were constructed with bituminous pavement and curb in 1988. No storm sewer or public utilities exist under the streets, with the exception of a 15" culvert that conveys surface drainage under Garnet Street just north of 16$h Avenue. Both streets are relatively flat and as such do not quickly shed stormwater runoff. This results in water standing on the pavement for long periods of time which strips oil from the pavement, thereby weakening it. Both streets have a Pavement and Surface Evaluation Rating (PASER) of 1 ranking them among the worst streets in the City in terms of pavement condition. In fact, bituminous pavement is missing from large areas of Garnet Street requiring City staff to fill these unpaved areas with class 5 aggregate on a regular basis to maintain the streets in a passable condition. Then each spring when the ground thaws Garnet Street becomes extremely difficult to navigate and maintain due to the poor underlying soils which become unstable. Proposed Improvements Subgrade corrections 3 -feet in depth are proposed along both street segments to provide a uniform, stable subgrade base for the new pavement sections. While this will increase project costs significantly, it will ensure that the maximum pavement life can be achieved with minimal maintenance. Subgrade corrections are proposed to consist of excavating roughly 3 -feet of the unsuitable subgrade material and backfilling the void with imported select granular borrow (sand). It should be noted that per the City's adopted Special Assessments Policy the cost to correct unsuitable subgrade soils is not eligible for special assessments. Therefore, these costs are proposed to be paid in full with City funds.