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I I , I I I I I I It I I I I I I I " I 2005 PAVEMENT MANAGEMENT PROGRAM I C. PROPOSED ROADWAY IMPROVEMENTS , OVERVIEW The following is a summary of the proposed rehabilitation/reconstruction treatments that are proposed for the project area streets. Proposed street widths are measured between the face of new curbs. Four alternatives are proposed for the TH 51 Frontage Road which are provided for consideration of the Council. The proposed roadway improvements are illustrated in exhibits Al - A5 in Appendix A. Dunlap Street (full depth reconstruction, 32 foot width, storm sewer) TH 51 Frontage Road Alt 1 (full depth reconstruction, 32 foot widfh, storm sewer) TH 51 Frontage Road Alt 2 (full depth reconstruction, 32 foot width, storm scwer) TH 51 Frontage Road Alt 3 (full depth reconstruction, 18 foot width, storm sewer) TH 51 Frontage Road Alt 4 (complete removal, cuI de sac Grey Fox Road) Red Fox Road (patching, full width milling, 2.5" bituminous overlay) Grey Fox Road (patching, full width milling, 2,5" bituminous overlay) Northwoods Drive (partial width milling, 2" bituminous overlay) NEW PAVEMENT SECTION DISCUSSION The proposed roadway improvements for Dunlap Street and the frontage road along TH51 include a full reconstruct due to their deteriorated conditions, lack of curb & gutter, drainage infrastructure. The proposed street pavement sections will be designed in accordance with MnDOT State Aid guidelines for flexible pavement design utilizing the soil R-values measured from the geotechnical analysis accomplished as a part of the final design process. City standards include a 12 inch sand subbase. The sand subbase will provide enhanced pavement support, pavement subdrainage and frost protection necessary for the soils encountered in this area. The anticipated pavement cross section will include 5 inches of bituminous surfacing, 8 inches of Class 5 aggregate base and 12 inches of sand subbase, The sand subbase will be drained with perforated pipes running along the length of the roadway and connected to storm sewer catch basins, Final pavement sections will be determined as a part of the final design process based upon the soil borings and analysis of in place soils and traffic loads, Traffic counts have been taken for the streets for present traffic volume and future traffic and subsequent loading on the pavements was determined, The sand subbase will add value to the pavement section through increased strength and frost resistance, The cost of the sand subbase is approximately $25,00 per linear foot of roadway. Additional excavation, or subgrade excavation, may be required to correct poor soils in isolated locations as field conditions dictate. CURB AND GUTTER DISCUSSION The proposed improvements include concrete curb and gutter on Dunlap Street and the TH 51 Frontage Road. The City guidelines allow for the use of three types of curb: 4" barrier, 6" barrier URS 5