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• We will only include the east-west branch of the Greenhill Tributary (from Terry Street to <br /> the confluence with the A Channel) in the detailed hydraulic study; <br /> • We will perform the floodplain and floodway analyses for the Diversion Channel, the A <br /> Channel and a portion of the Greenhill Tributary as defined in this letter; <br /> • We will generate detailed work maps to be used for the hydraulic analyses of different <br /> failed levee scenarios; <br /> • FEMA and Michael Baker will approve of our approach. In other words, no significant <br /> changes would occur in the hydraulic analyses as compared to what we propose in this <br /> letter. <br /> Note that the estimated cost for completing the hydraulic analyses is higher than we <br /> anticipated in November 2000. One of main reasons for the higher cost is attributed to the <br /> amount of work that is required to generate the required data that can be readily used in the <br /> hydraulic analyses. Significant time and effort is required to retrieve information and convert <br /> the information obtained from various sources to a consistent format. <br /> Task 4. Floodplain and Floodway Identification <br /> We expect that the work to be completed and the budget needed for this task will remain the <br /> same as proposed in the original contract (i.e., $8,600). <br /> Task 5. Complete FEMA LOMB Application and Documentation <br /> The scope and budget for this task remains unchanged from the original contract (i.e., <br /> $13,600). <br /> Task 6. FEMA Approval Process and Project Management <br /> As stated earlier and also indicated in our November 2000 contract addendum, we expect <br /> more frequent communications and interactions with FEMA throughout the application <br /> process due to the complexity of the open waterway system. This will result in a higher <br /> demand for task management and coordination. We estimated that $8,400 will be needed to <br /> complete this task. <br /> Summary <br /> In summary, we estimate approximately $86,000 (Table 2) would be needed to complete the <br /> remaining tasks for the LOMR study. Given that there is currently $2,000 left in the contract, <br /> the actual additional budget needed is estimated to be $84,000. Therefore, with $59,500 <br /> <br /> provided in the original contract, the total cost for the overall project is estimated to be <br /> <br /> $143,500. <br /> s:lproj94U45042"`~amazonFEMA~contractaddendum.doc <br /> 07/13/01 <br /> 5 <br /> <br />