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<br /> <br />Federal Emergency Management Agency <br />. Washington, D.C. 20472 <br /> <br />AUG 14 2001 <br /> <br />CERTIFIED MAIL <br />RETURN RECEIPT REQUESTED <br /> <br />IN REPLY REFER TO: <br />Case No.: 01-08-059P <br /> <br />The Honorable Ken Fellman <br />Mayor, City of Arvada <br />City Hall <br />8101 Ralston Road <br />Arvada, CO 80002 <br /> <br />Community: City of Arvada, CO <br />Community No.: 085072 <br />Panels Affected: 085072 0001 Band 0002 B <br />Effective Date of DEe 05 2001 <br />This Revision: <br /> <br />102-I-A-C <br /> <br />Dear Mayor Fellman: <br /> <br />This responds to a request that the Federal Emergency Management Agency (FEMA) revise the effective <br />Flood Insurance Rate Map (FIRM) and Flood Insurance Study (FIS) report for your community in <br />accordance with Part 65 of the National Flood Insurance Program (NFIP) regulations. In a letter dated <br />November 28, 2000, - , P.E., P.L.S., Project Engineer, Civil Design <br />Group, Inc., requested that FEMA revise the FIRM and FIS report to show the effects of the following <br />physical changes associated with the Cottonwood West Industrial Park in the floodplain along Ralston <br />Creek: <br /> <br />. Channelization and placement offill in the floodplain along the north bank of Ralston Creek from <br />Joyce Street to Croke Canal, <br /> <br />. An existing overchute and side channel spillway for Ralston Creek at Croke Canal, and <br /> <br />. Existing changes in grade associated with a trail system. <br /> <br />This request follows up on a Conditional Letter of Map Revision issued on October 1, 1997. <br /> <br />All data required to complete our review ofthis request were submitted with letters from Mr. James E. <br />Root, P.E., City Engineer, Public Works Department, City of Arvada, and J 1 <br /> <br />We have completed our review of the submitted data and the flood data shown on the effective FIRM <br />and in the effective FIS report. The revision request, as shown on the effective FIRM, affects the Special <br />Flood Hazard Areas (SFHAs), the areas that would be inundated by the flood having a I-percent chance <br />of being equaled or exceeded in any given year (base flood), designated Zone AO, an SFHA subject to <br />shallow flooding with average depths between I foot and 3 feet; Zone AH, an SFHA subject to shallow <br />flooding with average depths between 1 foot and 3 feet and with Base Flood Elevations (BFEs) <br />determined; and Zone AE, an SFHA with BFEs determined. A regulatory floodway is designated from <br />Indiana Street to Croke Canal. The revision request also affects an SFHA designated Zone A, with no <br />BFEs determined and no designated regulatory floodway from Croke Canal to approximately 450 feet <br />upstream. We have revised the FIRM and FIS report to modify the elevations, floodplain and floodway <br />boundary delineations, and zone designations of the base flood along Ralston Creek from just <br />downstream of Indiana Street to approximately 450 feet upstream of Croke Canal. As a result of the <br />modifications, the BFEs along Ralston Creek and the widths of the SFHAs and the regulatory floodway <br />