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