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. - . (I)_row. M."(~"@ ~ ~ ~ ' ;! ~qo 0 Federal Emergency Management Agency Washington, D.C. 20472 JUN t 4.2001 CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08-410R The Honorable Ron Stewart Chairman, Boulder County Board of Commissioners P.O. Box 471 Boulder, CO 80306-0471 Community: Boulder County, CO Community No.: 080023 104 Dear Mr. Stewart: . 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 Boulder County, Colorado and Incorporated Areas, in accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated September 21,2000, Mr. Gary Behlen, P.E., City Engineer, City of Broomfield, requested that FEMA evaluate the effects that the proposed Aspen Creek Phase I Regional Drainage Project (proposed project) along Quail Creek and Tributary D would have on the flood hazard information shown on the effective FIRM and FIS report. The Special Flood Hazard Areas (SFHAs), the areas that would be inundated by the flood having a I-percent chance of being equaled or exceeded in any given year (base flood), along both streams are designated Zone A, SFHAs where no Base Flood Elevations have been determined. The approximate Zone A boundary delineations shown on the effective FIRM are based on an existing conditions hydraulic analysis from the Flood Hazard Area Delineation (FHAD) report for Quail Creek & Tributaries and McKay Basin, prepared by the Urban Drainage and Flood Control District (UDFCD), dated July 1986. All data required to complete our review of this request for a Conditional Letter of Map Revision (CLOMR) were submitted with letters from Mr. David C. Webster, P.E., Water Resources Engineer, Boulder County Transportation Department; Mr. Besharah Najjar, P .E., Floodplain Administrator, Department of Public Works, Adams County; Mr. Phillip M. Bowman E.I., Project Engineer, Rocky Mountain Consultants, Inc.; and Mr. Behlen. The proposed project reach extends along Quail Creek from approximately 1,600 feet downstream of Sheridan Parkway to Country Estates Pond, which is located just upstream of South 124th Street, and along Tributary D from the confluence with Quail Creek to approximately 50 feet downstream of South 124th Street. The proposed project along Tributary D within Boulder County will consist of channelization from approximately 600 feet upstream to approximately 1,400 feet upstream of Sheridan Parkway. . Because the proposed revision will also affect the City of Broomfield and the unincorporated areas of Adams County, separate CLOMRs for those communities were issued on the same date as this CLOMR.