Agenda - Public Works Committee - 12/13/2011

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4. PROPOSED IMPROVEMENTS 4.1 Street It is proposed to reconstruct Armstrong Boulevard to a four lane divided roadway with one left -turn and one right -turn lane in the northbound direction and one left -turn and one right -turn lane in the southbound direction. See Figure 2 in Appendix A. All lanes would be 12 feet in width with a 1.5 foot curb and gutter on the inside median and a 2- foot curb and gutter on the outside lanes. See Figure 7 for existing and proposed cross sections. At the north end, the project will match into the recently reconstructed section of Armstrong Boulevard. The improvements are consistent with the long term interchange layout for the TH 10 and Armstrong Boulevard intersection. The project would also reconstruct approximately 350 feet of 147t1i Avenue west of Armstrong Boulevard in order to realign 147th Avenue with the relocated Sunwood Drive. 4.2 Trail An eight (8) foot trail will be constructed on the east side of Armstrong Boulevard starting at the relocated Sunwood Drive and extending north to the intersection of Armstrong Boulevard and Bunker Lake Boulevard. See Figure 2 in Appendix A. 4.3 Storm Sewer Most of the drainage from Armstrong Boulevard and 147th Avenue will be picked up and carried to the recently constructed pond on the east side of Armstrong Boulevard and south of Bunker Lake Boulevard. The proposed Armstrong Boulevard will have curb and gutter on both sides of Armstrong Boulevard to approximately 25 feet south of the intersection with 147th Avenue. South of this point will be temporary construction with a rural section. The storm water runoff from the urban section will be picked up by a line of catch basins just south of the 147t1i Avenue and Armstrong Boulevard intersection and a second line of catch basins near the tie in point with the Armstrong Boulevard and Bunker Lake Boulevard project (approximately station 40+25). The drainage from the temporary rural section of Armstrong Boulevard south of 147th Avenue will be picked up in ditches and carried to the drainage system at 147t1i Avenue. Water from 147th Avenue will be picked up at the intersection and by catch basins located at the westerly terminus of the 147t1i Avenue reconstruction. There is a small section at the southerly terminus of the Armstrong improvements that will drain to the existing pond by Coborn's as it does today. See Figure 6 in Appendix A. 4.4 Sanitary Sewer The existing sanitary sewer along Armstrong Boulevard will remain in place. Additional fill will be placed over the existing sanitary sewer line on Armstrong Boulevard to accommodate the raised grade needed on Armstrong Boulevard. The inplace sanitary sewer pipe is designed to handle the additional fill from this interim project. However, it is likely that some modification of the sanitary sewer line near 146th Avenue will be required with the future interchange project. The extent of the modifications will depend on whether a right -turn lane to old Sunwood Drive is provided from the interchange. The least costly option would be to relocate the southerly 300 feet of this line to the east side of the road in the future when the interchange is built. There are currently three man Feasibility Report Armstrong Boulevard and Relocated Sunwood Drive Intersection Improvements City of Ramsey, MN WSB Project No. 1973-010 Page 6