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A <br /> WSB <br /> 701 Xenia Avenue South I Suite 300 1 Minneapolis, MN 55416 1 (763)541-4800 <br /> December 27, 2016 <br /> Mr. Bruce Westby P.E. <br /> City Engineer <br /> 7550 Sunwood Drive NW. <br /> Ramsey, MN 55303 <br /> Re: Pavement Evaluations and Recommendations for City of Ramsey Improvement Project#17-00 <br /> 2017 Sunwood Drive Reconstruction <br /> Observation: On December 20, 2016 WSB &Associates cored Sunwood Drive from Ramsey Blvd. to <br /> Bunker Lake Blvd in Ramsey, MN, to verify the thickness of the Hot Mix Asphalt (HMA) and to determine <br /> what type of granular base was under the HMA. The pavement is in a light industrial park area and was <br /> constructed in 1980s. The main observed distress was cracking caused by aging of the HMA. Some <br /> fatigue cracks were observed in the wheel paths which are to be expected as a pavement meets its <br /> design life. One other observation was that the some of the warehouses were expanding their building <br /> which leads me to believe the truck traffic will only increase over the next 20 years. The cores measured <br /> 4 inches thick with a granular base material that appears to be Class 5. <br /> Recommendations: Based on the information above our first recommendation would be to mill off 3 <br /> inches of the HMA and then do a 6 inch Stabilized Full Depth Reclamation (SFDR) using asphalt <br /> emulsion. The concept of doing SFDR over removing and repaving is that we can increase the structural <br /> capacity of the pavement by building down deeper into the pavement structure. This option would <br /> completely break up the existing crack pattern. Properly designed and constructed SFDR should yield <br /> gravel equivalencies of 1.5 to 2.0 with 1.8 being a good design value to use. Then repave the last 3 <br /> inches using SPWEB440C Super Pave. MnDOT gives this option the same value as a complete <br /> reconstruction at approximately 40 to 60 percent of the cost. <br /> Option 2 would be to remove all the HMA and re-compact the base and repave. This option should be <br /> less expensive than Option 1. The one issue that we have with this option is the belief that truck traffic on <br /> Sunwood is only going to increase and that this option may fail prematurely compared to the existing <br /> pavement. If this option is chosen we would recommend using 4 inches of the same HMA as spelled out <br /> above. <br /> Please let me know if you have any other questions of comments regarding this report. <br /> Sincerely, <br /> WSB Associates, Inc. <br /> Thomas J. Wood <br /> Project Manager <br /> Building a legacy—your legacy. <br /> Equal Opportunity Employer I wsbeng.com <br /> H.Sdty of ramseyLsunwood ddve mcommewoon final dwx <br />