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WSB <br />AMMINEW 701 Xenia Avenue South I Suite 300 I Minneapolis, MN 55416 I (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 #17-02 <br />2017 Mill and Overlay Improvements <br />Observation: On December 20, 2016 WSB & Associates cored the 147th 148th 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 1/2 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 />ssociates, Inc. <br />Thoms J. Wood <br />Project Manager <br />Building a legacy — your legacy. <br />Equal Opportunity Employer I wsbeng.com <br />H:dly of ramseykRamsey 12 cores recommendation 12.27.16 final.docx <br />