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I h .. Federal Emergency Management Agency Washington, D.C. 20472 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 99.08;.416P The Honorable Steve Ward Chairperson, Arapahoe County Board of Commissioners 5334 South Prince Street Littleton, CO 80166-0060 Community: Arapahoe County, Colorado Community No.: 080011 Panel Affected: 08005COl95 J and 0215 J Effective Date of FE B 1 8 2000 This Revision: 102-I-C Dear Mr. Ward: This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective Flood Insurance Rate Map (FIRM) for your community in accordance with Part 65 of the National Flood '"Insurance Program (NFlF-) regulations. In a letter dated July 12, 1999, Mr. Barry O. Moore, P.E. Project Manager, EMK Consultants, Inc., requested that FEMA revise the FIRM to show the effects of updated topographic information and construction along Unnamed Creek of a restrictor structure on the existing box culverts at East Hampden Avenue associated with construction of the Mesa Filing No. I development. The Special Flood Hazard Area (SFHA), the area that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood), along this reach is designated Zone A, an SFHA with no base flood elevations determined. This request follows up on two Conditional Letters of Map Revision issued on February 19, 1997, and June 19, 1997. All data required to complete our review of this request were submitted with letters from Mr. Steven L. Gardner, P.E., Program Manager, Stormwater Management Group, Development Services/Infrastructure Management, Engineering Division, Arapahoe County, and Mr. Moore. 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 floodplain boundary delineations of the base flood along Unnamed Creek from just downstream to approximately 3,000 feet upstream of East Hampden Avenue. As a result of the modifications, the width of the SFHA increased in some areas and decreased in other areas. All increases in SFHA width are contained on the developer's property and in the right-of-way of South Himalaya Street. The modifications are shown on the enclosed annotated copies of FIRM Panel(s) 08005COl95 J and 08005C0215 J. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel(s) of the effective FIRM dated August 16, 1995. The modifications 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.