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<br /> 701 XENIA AVENUE S | SUITE 300 | MINNEAPOLIS, MN | 55416 | 763.541.4800 | WSBENG.COM <br /> <br />Type of Reactive Maintenance Description Estimated Cost ($ per mile)1 Estimated Extension of <br />Life <br />Fog Sealing <br />Involves a light uniform layer of <br />asphalt emulsion to seal minor cracks <br />and surface defects <br />$6,400 0 to 4² <br />Chip Sealing <br />Involves spreading a thin layer of <br />heated liquid asphalt and immediately <br />thereafter applying small aggregates <br />on top. <br />$23,000 2 to 8² <br />Double Chip Sealing Second layer of chip seal is applied <br />immediately after the first layer. $55,000 2 to 10² <br />Micro Surfacing <br />A cold-mix paving material and it is <br />quick setting. It is applied with a <br />specialized machine that can spread <br />the mix in variable thicknesses to <br />address rutting and dips. <br />$51,000 at 30 pounds per <br />square yard 3 to 8² <br />ThinLay™ Is a Hot Mixed Asphalt mix placed <br />from ½ to ¾ inch thick <br />$36,500 for ¾ inch thick at $60 <br />per ton of mix 2 to 10² <br />Ultra-Thin-Bonded-Overlay <br />(Nova Chip™) <br />Is a grape grade HMA mixture applied <br />with special paver that applies a heavy <br />asphalt emulsion bonding layer <br />immediately in front of the mix <br />$67,000 at 75 lbs. per square <br />yard 3 to 15² <br />One- to 1 ½-inch Overlay A layer of hot mix asphalt is placed <br />over the existing pavement structure. <br />$53,000 for an inch overlay <br />with $65 per ton mix 3 to 10² <br />Mill and Overlay <br />The process of grinding off the top <br />later of existing asphalt pavement and <br />replacing the removed layer with a <br />new hot-mix asphalt surface. <br />$120,000 for two-inch mill and <br />overlay with $65 per ton mix 4 to 15² <br />1 Cost estimates for all activities are provided in per-mile costs based on current bid prices or historical information and assume a two- <br />lane, 24-foot wide pavement. Cost estimates provided are based on the 2019 JPA pricing and the 2018 MnDOT Average Bid Pricing. <br />² The life estimates are dictated on the current condition of the pavements at the time of application of the treatments. It should be noted <br />that applying the treatments above to roads rated with lower OCIs should apply the lower range of the estimated life extension. F or <br />example, the range for Overlays/Mill and Overlays per the pavement management report is an OCI of 40 to 70. A road with an O CI of a <br />40 receiving a Thinlay™ should expect a life expectancy closer to 2 years, whereas a road with an OCI of a 70 receiving a Thinlay™ <br />should expect a life expectancy closer to 10 years.