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of O 0 40 M MAS'I'ELLER & MOLER, INC. CIVIL ENGINEERS August 23, 2000 Mr. Christopher J. Kafer, P.E. County Engineer Indian River County 1840 25th Street Vero Beach, Florida 32960 RE: Addendum #4 to CR 512 Roadway Improvement Project #9611 Proposal for Feasibility Study to Expand Stormwater Basin #A at Northwest Corner of 102"d Terrace & Route 512 as part of the 512 Project Indian River County, Florida Dear Mr. Kafer: In accordance with your request, Masteller & Moler, Inc. is pleased to submit 'this Addendum 44 proposal to Indian River County's Public Works Department for expansion of the Scope of the CR512 Roadway Improvement project. Based on a series of meetings involving representatives of the Florida Department of Environmental Protection (FDEP), property owners and Indian River County Public Works Right-of-way staff, it has been determined that the FDEP agrees to accomplish filling two (2) manmade canals east of 102°d Terrace on the St. Sebastian River Preserve site. Discussions occurred concerning the potential for diversion of stormwater runoff currently flowing to the two (2) manmade canals south into an expanded version of Lake "A" in the CR512 Roadway Improvements Project. The purpose of this Addendum Scope as proposed will be to determine the feasibility of expanding the design of Lake "A" from approximately 2.2 acres to 30 acres to accommodate a significantly larger drainage shed. The proposed 30 acre stormwater basin would service as an expanded drainage area to the northwest and west of Route 95 covering lands owned by the Carson Platt Estates and extending to the drainage divide, known as "Ten (10) Mile Ridge" running in a north/south direction. In order to determine if the new 30 acre stormwater basin will function as desired, a Feasibility Study must be performed with the contents described as follows: Masteller & Moler, Inc. will determine the shape and area of the upstream drainage shed and establish the drainage information based on the undeveloped state of the Carson Platt Estate property which will contribute runoff to the proposed 30 acre stormwater basin. It will be assumed that the developed and undeveloped properties in the Industrial Park area north of the proposed 30 acre stormwater basin will have their drainage systems reconfigured for discharge 2205 W' Avenue, Vero Beach, Florida 32960 Phone: (561) 567-5300 Fax: (561) 794-1106 E -Mail: moler@gate.net