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At the request of Member Seigler, Mr. Schwartz advised that $220,000 would <br /> apply to approximately one mile of mill and overlay costs. <br /> Mr. Culver advised that the City was currently at the point where they were <br /> performing mill and overlay on the roads with the worst condition index, and if <br /> spending $1.1 to $1.5 million annually, could accomplish 4 to 5 miles each year. <br /> Further discussion included impacts of second and third seal coating in the <br /> delamination situation; staff's recommendation for elimination of seal coating on <br /> post-2005 constructed roads pending results. <br /> Mr. Schwartz noted that a few pavements, done in the early 1980's or late 1970's <br /> with 3-4 coats of seal coating were showing no problems, but it started showing <br /> up in the 1990's when refining processes were changed during that time as well, <br /> but not addressed by the industry as a potential factor as of yet. <br /> Mr. Culver concurred, noting that there were constant adjustments being made to <br /> the refining process to squeeze out as much crude oil as possible, with the <br /> resulting byproduct available for residential or other uses. <br /> Additional discussion included impacts of further delaying maintenance based on <br /> past budget constraints already putting a strain on the pavement management <br /> program (PMP) and potential ramifications as previously reviewed by the <br /> PWETC 4-5 years ago; typical depth of seal coating by the time of a third lift of <br /> approximately one inch; and city pavements typically 4 inches in depth with <br /> larger volume roadways of 7 — 10 inches in depth. <br /> Discussion ensued confirming that neither Ramsey or Hennepin Counties <br /> performed sealcoating; differing pavement conditions from one segment to <br /> another frequently based on jurisdictional ownership of a particular roadway; <br /> impacts of higher traffic volumes on county roadways, but all experiencing the <br /> same climate conditions, and other agencies (e.g. MnDOT and/or Ramsey <br /> County) using different pavement mixes than that used by the City of Roseville. <br /> Mr. Schwartz noted that those agencies typically plan for mill and overlay in <br /> shorter periods of time (e.g. 15 —20 years) while the City had not done so in the <br /> past before a road reached a thirty year life cycle. <br /> Further discussion included experimentation with other types of repair of those <br /> delamination issues, including the Cities of Woodbury and Maple Grove, with no <br /> obvious long-term solutions found to-date either from a thin mill and overlay or <br /> seal coating of delaminated streets; whether preparation of the roadway before <br /> seal coating application was of any impact, with limited failures observed based <br /> on observations on a case by case basis. <br /> Chair Stenlund noted that many variables, including silt and sand components, <br /> and emulsification of oils used. <br /> Page 9 of 17 <br />