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. Federal Emergency Management Agency Washington, D.C. 20472 \; AUG 18 2000 ReceIVED AU6 2 3 2000 Colorado Water Conservation CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 99-08-438R The Honorable Paul Tauer Mayor, City of Aurora City Manager's Office 1470 South Havana Street, Eighth Floor Aurora, CO 80012-4090 Community: City of Aurora, CO Community No.: 080002 104 Dear Mayor Tauer: . 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) and Flood Insurance Study (FIS) report for your community in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated September 17, 1999, Mr. Mark Mancini, Project Engineer, Department of Public Works, City of Aurora, requested that FEMA evaluate the effects that updated topographic infonnation and the proposed Tallyn's Reach development would have on the flood hazard infonnation for Sampson Gulch shown on the effective FIRM. The proposed project will consist of construction of an in-line, regional water-quality pond; a 44-inch-diameter reinforced-concrete pipe culvert (RCP) and a 36-inch-diameter RCP; and a reinforced-concrete box culvert (RCB) at the proposed Gun Club Road crossing. 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, with no base flood elevations detennined. Although portions of the area to be revised are shown on the effective FIRM as within the unincorporated areas of Arapahoe County, they have been annexed by the City of Aurora. All data required to complete our review of this request for a Conditional Letter of Map Revision (CLOMR) were submitted with letters from Mr. Vince C. Geronimo, Project Engineer, P.R. Fletcher & Associates, Inc., and Mr. Mancini. We reviewed the submitted data and the data used to prepare the effective FIRM for your community and detennined that the proposed project meets the minimum floodplain management criteria of the NFIP. The submitted existing conditions HEC-RAS hydraulic computer model, dated June 12,2000, based on updated topographic infonnation, was used as the base conditions model in our review of the proposed conditions model for this CLOMR request. We believe that, ifthe proposed project is constructed as shown on the submitted plans entitled "Tallyn's Reach, Sampson Gulch Floodplain Modification Study, Conditional Letter of Map Revision," dated June 12, 2000; and as described in the report entitled "Floodplain Modification Study and CLOMR Application for Sampson Gulch, Tallyn's Reach, Aurora, Colorado," dated August 1999, both prepared by P.R. Fletcher & Associates, Inc., and the data listed below are received, a revision to the FIRM would be warranted. .