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. Federal Emergency Management Agency Washington, D.C. 20472 MAY 30 2001 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 01-08-089R The Honorable Kathryn Eccker Mayor, City of Black Hawk P.O. Box 17 Black Hawk, CO 80422 Community: City of Black Hawk, CO Community No.: 080076 l04 Dear Mayor Eccker: . 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 December 7, 2000, Ms. Brook Svoboda, Development Coordinator, City of Black Hawk, requested that FEMA evaluate the effects that proposed drainage improvements, associated with the HyattIBlack Hawk Resort and'Casino development, along Fourmile Gulch from State Highway 119 (SHll9) to approximately 1,035 feet upstream would have on the flood hazard information shown on the effective FIRM and FIS report. 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 Fourmile Gulch is designated Zone A, an SFHA with no Base Flood Elevations determined. An existing I O-foot by 10-foot reinforced-concrete box culvert (RCB) under the SHll9 crossing of Fourmile Gulch connects with an existing 72-inch-diameter reinforced-concrete pipe culvert (RCP) that discharges into North Clear Creek. An existing 66-inch-diameter RCP lies under the Richman Casino parking lot from just upstream to approximately 150 feet upstream ofSHll9 and connects with the 10-foot by 10-foot RCB. The proposed improvements include extension of the existing 66-inch-diameter RCP from approximately ISO feet upstream to approximately l,035 feet upstream ofSH119. This request also included a new hydrologic analysis for Fourmile Gulch and a hydraulic analysis that incorporated more detailed topographic information for Fourmile Gulch from approximately 1,035 feet upstream to approximately 1,140 feet upstream ofSH119. All data required to complete our review of this request for a Conditional Letter of Map Revision (CLOMR) were submitted with letters from Mr. Russell L. Burrows, P.E., Carroll & Lange, Inc., and Ms. Svoboda. . We reviewed the submitted data and the data used to prepare the effective FIRM for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. The submitted existing conditions HEC-2 hydraulic computer model, dated January 18, 200 l, 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 entitled "HyattIBlackhawk Resort & Casino, Fourmile Gulch CLOMR Work Map," Sheets 1 and 2, prepared by Carroll & Lange, Inc., dated September 1998, and the data listed below are received, a revision to the FIRM would be warranted.