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, Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 97-08-I95P The Honorable Margaret Carpenter Mayor, City of Thornton 9500 Civic Center Drive Thornton, Colorado 80229 Community: City of Thornton, Colorado Community No.: 080007 Panels Affected: 0800lC0045 G and 0330 G Effective Date of This Revision: AP R 2 2 1997 102-D Dear Mayor Carpenter: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for Adams CO\Ulty, Colorado and Incorporated Areas (the effective FIRM for your community), in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. By telephone on March 18, 1997, Mr. Frank Casteleneto, City Engineer, City of Thornton, requested that FEMA revise the FIRM to show the correct locations of several streets along Grange Hall Creek between East 104th Avenue and East 108th Avenue, along Brantner Gulch between Colorado Boulevard and Quebec Street, and along Basin 4100 between York Street and the Union Pacific Railroad. All data required to complete our review of this request were submitted with a letter from Ms. Debbie Borowski, Engineering Technician II, Public Works Survey Deparunent, City of Thornton. Because this Letter of Map Revision (LOMR) is being issued to correct a mapping or study analysis error, fees were not assessed for the review. We have completed our review of the submitted data and the flood data shown on the effective FIRM. We have revised the FIRM to modify the street locations as listed above. The modifications are shown on the enclosed annotated copies of FIRM Panel(s)"08001 C0045 G and 08001 C0330 G. This LOMR hereby revises the above-referenced panel(s) of the effective FIRM dated August 16,1995. In a telephone conversation on April 4, 1997, Ms. Borowski informed a representative of our Technical Evaluation Contractor that the channel along Basin 4100 has been modified between York Street and the Union Pacific Railroad. In order to reflect the impact of these existing channel modifications on the FIRM, please submit technical data as required in Section 65.3 of the NFIP regulations. The moditications are effective as of the date shown above. The map panel(s) as listed above and as modified by this letter will be used for all flood insurance policies and renewals issued for your community. A review of the determination made by this LOMR and any requests to alter this determination should be made within 30 days. Any request to alter the determination must be based on scientific or technical data. We will not physically revise and republish the FIRM for your community to reflect the modifications made by this LOMR at this time. When changes to the previously cited FIRM panel(s) warrant physical revision and republication in the future, we will incorporate the modifications made by this LOMR at that time.