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AACE <br />EXHIBITA <br />WORK ORDER NUMBER AA -1 <br />ft+ .>N.awH-sa: x"aPORw.. <br />(a'Otedin€f:at <br />Indian River County BOCC <br />Public Works - Stormwater Division <br />1801 27th Street <br />Vero Beach, FL 32960 <br />Attention: Mr. Keith McCully, P.E. <br />PROPOSAL FOR CONSTRUCTION MATERIALS TESTING <br />OSPREY ACRES FLOWAY AND NATURE PRESERVE <br />INDIAN RIVER COUNTY, FLORIDA <br />AACE Proposal No. P17-810 <br />May 10, 2017 <br />Andersen Andre Consulting Engineers, Inc. (RACE) is pleased to present this proposal for performing <br />construction materials testing and monitoring services for the proposed Osprey Acres Floway and <br />Nature Preserve project in Indian River County, Florida. AACE is the Geotechnical Engineer -of - <br />Record for this project, and has previously issued a Snbsnrfare Exploration and Geotechnical Engineering <br />Evaluation report for the project dated October 26, 2016 (AACE File No. 16-144). <br />Based on our review of the provided bid documents and construction drawings, and on our prior <br />involvement with the project, we understand that it is proposed to construct a serpentine nutrient <br />removal/water treatment system which will receive an estimated 10-12 million gallons per day of piped <br />water inflow from the adjacent Osprey Marsh polishing pond and from untreated drainage canals. The <br />treatment system will consist of the following interconnected main features (elevations in NAVD-88): <br />Initial deep settling basins <br />» Bottom elevation of 11.63 feet <br />» Design water stage of elevation 18.81 feet <br />Water lettuce scrubbers/transfer channel <br />» Bottom elevations of 14.5 feet <br />» Design water stages of elevation 18.76 feet and 18.19 feet, respectively <br />A filter marsh <br />» Bottom elevation of 16.0 feet <br />» Design water stage of elevation 18.03 feet <br />Floway sections "A" and "B" <br />» Bottom elevation of 11.0 feet <br />» Design water stage of elevation 17.50 feet <br />Various concrete weir structures with varying crest heights <br />Floway section "C" <br />» Bottom elevation of 10.0 feet <br />» Design `eater stage of elevation 16.00 feet <br />1 ik': rl"Z ffb <br />ceIiIc-COPll <br />