09-1994 Change Order No. 3 to Agreement with Inwood Consulting Engineers, Inc. for Design Services for Anchor Road

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December 19, 2008 Kelly H. Brock, Ph.D., P.E., CFM City Engineer City of Casselberry 95 Triplet Lake Drive Casselberry, Florida 32707 (Inwood e`'-_ consulting engineers CAS -001 Re: Supplemental Proposal for Anchor Road Roadway & Drainage Improvements (Revised) City of Casselberry, Florida Dear Mr. Brock: Inwood Consulting Engineers, Inc. (Inwood) is submitting for your review and consideration this request for supplemental funds for the above referenced project. The supplemental is intended to address additional expenditure of man-hours beyond what was originally proposed to address changes in design direction dictated by the City. The additions are summarized as follows: 1. Efforts required to provide a supplemental pond design option without the cul-de-sac at Oak Street. This will include revisions to the design plans for a new pond configuration with associated drainage infrastructure modifications including modeling to verify attenuation and calculations to verify pollutant loads. 2. Prepare design plans for retaining walls along the western edges of the proposed ponds as part of the pond re -design. This will include geotechnical analysis to be conducted by subconsultant GEC in accordance with their enclosed proposal. Note that it is assumed that the wall will be either sheet pile, FDOT spec gravity wall, or masonry block which will not require design by a structural engineer. 3. Prepare permit modification to the SJRWMD if necessary to address the pond re- design. Note that it assumed the submittal will be electronic and the fee will be paid for by the City. The total requested supplement amount is $28,916.64 as a lump sum addition to the existing contract (Purchase Order 052328 dated 10/02/07). A summary of the Inwood man-hours and fees is enclosed as Attachment A. The subconsultant GEC's costs are attached as Attachment B