Agenda - Public Works Committee - 03/21/2017

Home

City Engineer Westby stated the pavement corings indicated that 4-5 inches of pavement currently exists over about 5 inches of class 5, which meets a 10 ton design, and that the proposed pavement section includes 5 inches of stabilized reclaim material, which is stronger than standard class 5 aggregate base based on a higher granular equivalency factor, with 4 inches of new bituminous pavement placed on top, which also meets a 10 ton design. Chairperson Riley stated he would recommend a pavement core requirement be bid with the project, as well as regular inspections during paving. City Engineer Westby stated this can likely be done at little to no increase in project costs. Councilmember Johns asked how many pavement corings are typically completed. City Engineer Westby stated borings are currently only completed on State Aid streets at variable intervals typically around 1,000 feet. Councilmember Kuzma asked whether the City keeps accurate records of street construction. City Engineer Westby confirmed the City does maintain record drawings of newer street and utility projects, but added staff is working on scanning all older City records which are stored in boxes in numerous areas around City Hall so older records are not easy to locate or retrieve. City Engineer Westby thanked the Committee for their input. He added the Feasibility Report and preliminary assessments will be reviewed by the City Council at their January 24, 2017, regular meeting. Motion by Chairperson Riley, seconded by Councilmember Johns, to recommend that the City Council accept the recommendations outlined in the draft Feasibility Report for Sunwood Drive Reconstruction, City Improvement Proj ect #17-00. Motion carried. Voting Yes: Chairperson Riley, Councilmembers Johns and Kuzma. Voting No: None. 5.04: Consider Recommendation to City Council to Accept Draft Feasibility Report for Alpine Drive Reconstruction, Improvement Project #17-01 City Engineer Westby reviewed the staff report and summarized the draft Feasibility Report for this proposed project including existing conditions, proposed improvements, estimated costs, and proposed funding program. City Engineer Westby also reviewed staff's conclusions and recommendations for the project which included using a 10-ton pavement design, excluding improvements to the trail south of Alpine Drive, and requiring private property owners to protect, relocate and repair their own private irrigation systems. He added the road's aggregate base was constructed of recycled crushed concrete that was graded such that it became rehydrated over the years creating a weak concrete slab which cracked at semi -regular intervals causing the tenting that occurs in cold weather months. Public Works Committee / January 17, 2017 Page 5 of 9