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BRIDGE REPLACEMENTS AND WIDENING OF 66TH AVENUE 0503 0 31 1 FROM SOUTH OF SR 60 TO NORTH OF 57TH STREET 8 ' ` a6 / / - IDC PROFESSIONAL CIVIL ENGINEERING , GEOTECHNICAL ENGINEERING AND LAND SURVEYING SERVICES AMENDMENT NO . 9 TO THE PROFESSIONAL ENGINEERING/LAND SURVEYING SERVICES AGREEMENT BETWEEN ARCADIS US, Inc. AND INDIAN RIVER COUNTY, FLORIDA. This is an amendment to the existing Engineering/Land Surveying Services Agreement (AGREEMENT) dated September 6 , 2005 between ARCADIS US , Inc . (ENGINEER) and Indian River County (COUNTY) . This amendment addresses changes in " Section I — Project Limits and Description" , " Section III - Scope of Services " , and " Section V - Compensation " . Amendment Description This Amendment includes the following : " SECTION I - PROJECT LIMITS AND DESCRIPTION" is being modified to incorporate the following : Plans have been prepared for the construction of roadway and drainage improvements along 66th Avenue . The St . Johns River Water Management District ( SJRWMD) has requested modifications to the stormwater drainage plans to address permitting rules recently adopted by the Water Management District . The rule modifications require revisions to the subsurface storm drain piping systems , the stormwater drainage ponds , and the swales located on the intersecting side streets . The stormwater pond designs will be revised to provide for a dry retention treatment area in each pond in order to satisfy the SJRWMD ' s requirement for phosphorus removal . The stormwater piping system design will be modified to allow for discharge into the dry treatment areas . The side street swale designs will be modified to provide for the phosphorus loading criteria as well as the agencies drawdown criteria. The SJRWMD has requested geotechnical test results to demonstrate the permeability rate of the soils located within the side street swales and the pond sites . The previous geotechnical studies obtained permeability test results in only four locations along the project corridor . Additional permeability tests will be obtained and forwarded to the SJRWMD for their approval . In addition to the pond redesign , landscape plans will be prepared for each pond site . The landscape plans will include littoral plantings and lake bank plantings . The pond layouts will be revised to provide for the littoral zone for the planting areas . Irrigation plans have been prepared for the project utilizing wells for a water source . The County utilities department has determined that the irrigation water source should be reuse water. The irrigation plans will be revised to show connections to the existing reuse water main, and the Page 1 of 4 C : \Documents and Settings\aweragoda\Local Settings\Temporary Internet Files\OLK61 \66 th Ave Amendment No 9 4- 15 - 11 . doc