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• Fort Lauderdale • Lakeland engineering1!i testing , Jim • Port Saint • Sarasota www,dunl(elberger-engineering .com • West Palm Beach Indian River County August 29, 2008 180. 1 27'1' Street Project No . PSL- 08 -2558 (BG 11A ) Vero Beach, 'Florida 32960 Attention: Mr, Michael D . Nixon, PE. . . . via email Roadway Production Manager Subject ; Proposed Geotechnical Services . Improvements to 53 ` d Street & Old Dixie Highway Indian River County, Florida Dear Mr. Nixon. INTRODUCTION D inkelberger Engineering & Testing, Inc. (Dunke.lberger) is pleased to submit this proposal for the above referenced project. Our work scope into complete ai roadway soil survey and structure investigation generally following the guidelines outlined in the current FDOT Soils and . Foundation Handbook (2006) . PROJECT CONSIDERATIONS The project will involve an. approximately 4 ,000 lineal feet of improvements to 53 'd Street and 1 ,960 lineal feet of improvements to Old Dixie Righway ui Indian River County, Florida. The 53'`d Street improvements will begin at the east side of the- Lateral "H" Canal (Station 384+04 .66) and extend eastward to Indian River Boulevard (Station 424+00) . The section of road extending from Lateral "H ' Canal to Old Dixie Highway will consist of new 4-lane divided roadway. The section of existing 24ane roadway extending from Old Dixie Highway to Indian River Boulevard will be widened from 24ane to to 44ane divided roadway. Of note is an approximately 1 , 100-foot stretch of the proposed 53d Street between approximately Station 3 $ 7+00 and Station 398+00 , Anunimproved roadway presently exists along this section of roadway, with foamer borrow lakes being located on both sides. We understand that it is uncertain if this section of unimproved roadway was constructed before or after the excavation of the lakes . The composition of the unimproved roadway embankment is also unknown . The unknown quality and composition of the embankment fill , combined with the plans to place 6 to 9' feet of new fill over the existing embankment, poses concern for the construction and long term performance of the new road. The Old Dixie Highway improvements will begin approximately 1 ,080 feet south of 53`a Street (Station 89+47 .58) and extend to approximately 880 feet north of '53 `d Street. The improvements to Old Dixie Highway will consist of adding turn lanes to thet existing 2-lane roadway. State of Florida Board of Professional Engineers Authorization No . 6B70 Toll- Free: (877) 64M832