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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, MINI 55303 <br /> Re: Pavement Evaluations and Recommendations for City of Ramsey Improvement Project#17-02 <br /> 2017 Mill and Overlay Improvements <br /> Observation: On December 20, 2016 WSB &Associates cored the 1471n 1481H Yakima, and Xkimo <br /> roadways in the City of Ramsey, MN. The following observations were made during the investigation. <br /> The Hot Mix Asphalt (HMA) cores ranged in thickness from 2 inches to 3.25 inches, with the average <br /> thickness being 2.4 inches. The base material observed appears to be a mainly sandy select granular <br /> material. With the frozen ground, we were only able to chisel to depth of approximately 4 inches with no <br /> change in the base material observed. The coring locations can be found in Appendix A of this report. <br /> Pictures of each core can be found in Appendix B. Due to the streets being covered by snow it was hard <br /> to observe existing crack patterns, but the cores taken appear to be in very good condition for the age of <br /> the HMA. <br /> Recommendations: Based on the following information, these streets are true residual streets, <br /> constructed in the mid-1980s, and have performed satisfactorily. It would be our recommendation to <br /> remove the existing HMA, then re- compact the granular(sand) base and repave with 3 inches of level 3 <br /> Super Pave with '/ inch mixture with 3 percent air voids made with a PG -34 binder. An example would <br /> be SPWEA330C or A, mix. Using a '/7 minus mix with 3 percent air voids design should yield a very tight <br /> surface that should greatly diminish the infiltration of water into the HMA surface. Using a PG-34 binder <br /> should delay cracking over a PG-28 binder. One last suggestion to think about is possibly priming the <br /> granular base with a penetrating emulsion prime (PEP) to protect the bottoms of the HMA from damage <br /> from water coming thru the base materials. <br /> Please let me know if you have any other questions of comments regarding this report. <br /> Sincerely, <br /> TWSTSJ. <br /> ssociates, Inc. <br /> Thom Wood <br /> Project Manager <br /> Building a legacy—your legacy. <br /> Equal Opportunity Employer I wsbeng.corn <br /> RVY d r seyVRamsey 12 cores recommendation 12.27.16 final.dol <br />