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FS9903-CS 990607Federal Emergency Management Agency Washington, D.C. 20472 JUN 0 7 1999 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 99-06-1255R The Honorable Candy Shechan Mayor, City of Coppell 255 Parkway Boulevard Coppell, TX 75019 Community: City of Coppell, Texas Community No.: 480170 104 Dear Mayor Sheehan: This responds to a request that the Federal Emergency Management Agency (FEMA) comment on the effects that a proposed project would have on the effective Flood Insurance Rate Map (FIRM) for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated April 29, 1999, Mr. Ronald W. Morrison, P.E., C.F.M., Senior Hydrologist, Morrison Hydrology Engineering, Inc., requested that FEMA evaluate the effects that proposed placement of fill in the floodway frings,~dong the west overbank of Elm Fork of Trinity River from approximately 1,610 feet downstream to approximately 80 feet downstream of Sandy Lake Road would have on the flood baTard information shown on the effective FIRM. All data required to complete our review of this request for a Conditional Letter of Map Revision (CLOMR) were submitted with letters from Mr. Kenneth M. Griffin, P.E., Director of Engineering and Public Works, City of Coppell, and Mr. Morrison. We have completed our review of the submitted data and the flood data used to prepare the effective FIRM for your community. The submitted existing conditions HEC-2 hydraulic computer model, dated January 20, 1999, based on updated topographic information, was used as the base conditions model in our review of the proposed conditions model for this CLOMR request. We believe that, if the proposed project is constructed as shown on the submitted topographic work map endfled "Floodplain Fill Project, Proposed Floodplain," dated January 1999, and as desert'bed in the submitted report endfled "Flood Study in Support of a Conditional Letter of Map Revision for the Elm Fork of the Trinity River for a 10 Acre and 48 Acre Tract South of Sandy Lake Road and West of McArthur Boulevard, City of Coppell, Texas," dated April 26, 1999, both prepared by Morrison Hydrology Engineering, Inc., and the date listed below are received, a revision to the FIRM would be warranted. As a result of the proposed placement of fill, the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a 1-percent chance of being equaled or exceeded in any given year (base flood), will decrease compared to the effective SFHA width. 2 Upon completion of the project, your community may submit the data listed below and request that we make a final determination on revising the effective FIRM. Effective March 1, 1999, FEMA revised the fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps. In accordance with this schedule, the fee for your map revision request will be $3,400 nn~_ must be received before we can begin processing your request. Payment of this fee shall be made in the form of a check or money order, made payable in U.S. funds to the Natiopal Flood Insurance Program, or by credit card. The payment must be forwarded to the following address: Federal Emergency Management Agency Fee-Collection System Administrator P.O. Box 3173 Merrifield, VA 22116-3173 As-built plans, certified by a registered professional engineer, of all proposed project elements Community acknowledgment of the map revision request Certification that all fill placed in the currently effective base floodplain and below the proposed base flood elevation is compacted to 95 percent of the maximum density obtainable with the Standard Proctor Test method issued by the American Society for Testing and Materials (ASTM Standard D-698) or an acceptable equivalent method for all areas to be removed from the base floodplain Hydraulic analyses, for as-built conditions, of the base flood, the flood having a 0.2-percent chance of being equaled or exceeded in any given year, and regulaWry floodway if they differ from the proposed conditions models Ai~er receiving appropriate documentation to show that the project has been completed, FEMA will 'initiate a revision to the FIRM. This CLOMR is based on minimum floodplain management criteria established under the NFIP. Your community is responsible for approving all floodplain development, and for ensuring all necessary permits required by Federal or State law have been received. State, county, and community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for cousu'uction in the SFHA. If the State, county, or conunity has adopted more restrictive or comprehensive floodplain management criteria, these criteria take precedence over the minimum NFIP criteria. If you have any questions regarding floodplain management regulations for your community or the NFIP in general, please contact the Consultation Coordination Officer (CCO) for your community. Information on the CCO for your community may be obtained by contacting the Director, Mitigation Division of FEMA in Denton, Texas, at (940) 898-5127. If you have any technical questions regarding this CLOMR, please contact Mr. Alan Johnson of our staff in Washington, DC, either by telephone at (202) 646-3403 or by facsimile at (202) 6464596. Sincerely, HAlM.~.a~,t A~~m y~~~~!., Project Engineer cc: Mr. Kenneth M. Griffin, P.E. */ Director of Engineering and Public Works City of Coppell Matthew B. Miller, P.E., Chief Havnrds Study Branch Mitigation Directorate Mr. Ronald W. Morrison, P.E., C.F.M. Senior Hydrologist Morrison Hydrology Engineering, Inc.