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DUNKEbBERGER engineering & testing, inc. www.dunkelborger-ongineering.com • Fort Lauderdale • Lakeland • Port Saint Lucle • Sarasota • West Palm Beach Indian River County July 9, 2012 1801 27`h Street Project No. PSL -09-3054 (10.5) Vero Beach, Florida 32960 Attention: Mr. Michael D. Nixon, P.E.... via a -mail (tnnixon@ircgov. corn) Project Manager Subject: Pavement Coring Services Old Dixie Highway from 52"d Street to CR510 Indian River County, Florida Dear Mr. Nixon: Dunkelberger Engineering & Testing, Inc. (Dunkelberger) has performed Paventent Coring Services for the Old Dixie Highway roadway that is located between 52nd Street and CR510 in Indian River County, Florida. The subject roadway section incorporates approximately 4 miles of two-lane undivided flexible pavement. From our meeting with you on March 1, 2012, we understand that the County is planning to rehabilitate the subject roadway section in two phases within the next couple of years. The overall objective of this research work is to provide the County with feasible economic rehabilitation alternatives, which would allow your office to select the optimum rehabilitation strategy. The approach to this phase of the project consisted of collecting and analyzing the relevant project data, including (1) the extent and depth of distresses; (2) the composition of the existing pavement, including the subgrade and embankment; and (3) project constraints and special considerations. Based on the evaluation results, the rehabilitation alternatives will be developed which can repair the distresses as well as prevent rapid recurrence. DATA COLLECTION Dunkelberger performed pavement coring at select locations within the project limits as well as an existing pavement condition survey, The purpose of the coring work was to determine the composition of the existing pavement and the depth of its distress while the primary objective of the condition survey was to identify the types and extent of the distresses. Pavement Distresses: Tunes and Extent The results of our numerous site visits indicated that more than 80% of the existing pavement was distressed. The dominant types of distress are longitudinal cracking; while moderate nutting is also observed in wheel paths of the existing roadway. The longitudinal cracking, mostly located in the wheel paths, has a width of about'/ inch. State of Florida Board of Professional Engineers Authorization No. 6870 877.643.6633