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Federal Emergency Management Agency Washington, D.C. 20472 SEP 0 1 m CERTIFIED MAIL RETURN RECEIPT REQUESTED IN REPLY REFER TO: Case No.: 00-08-194P The Honorable Al Parker Mayor, Town of Castle Rock P.O. Drawer 8000 Castle Rock, CO 80104-8000 Community: Town of Castle Rock, CO Community No.: 080050 Panel Affected: 0170 C Effective Date of 0 C T 0 2 'WV\ This Revision: LVUU 102-I-C Dear Mayor Parker: 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 (NFIP) regulations. In a letter dated March 30, 2000, Mr. Stan Brown, P.E., Public Works Director, Town of Castle Rock, requested that FEMA revise the FIRM to show the effects of an existing detention basin along Tributary B to East Plum Creek (Tributary B) just upstream ofInterstate Highway 85; channelization from just upstream to approximately 1,000 feet upstream ofthe detention basin; an S4-inch-diameter reinforced-concrete pipe culvert (RCP) from the upstream end of the channelized reach of Tributary B to just downstream of Atrium Drive; two 66-inch-diameter RCPs at Atrium Drive; and updated topographic information. This request follows up on a Conditional Letter of Map Revision issued on March 10, 1999. All data required to complete our review of this request were submitted with letters from I , President, Anderson Consulting Engineers, Inc., and Mr. Brown. J 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 ofthe flood having a I-percent chance of being equaled or exceeded in any given year (base flood) along Tributary B from its confluence with East Plum Creek to Atrium Drive. As a result of the modifications, the width of the Special Flood Hazard Area (SFHA), the area that would be inundated by the base flood, for Tributary B increased in some areas and decreased in other areas. All affected property owners were notified of the aforementioned increases in SFHA width. The modifications are shown on the enclosed annotated copy of FIRM Panel 0170 C. This Letter of Map Revision (LOMR) hereby revises the above-referenced panel of the effective FIRM dated September 30, 1987. Because this revision request also affects the unincorporated areas of Douglas County, a separate LOMR for that community was issued on the same date as this LOMR. The modifications will become effective 30 days after the date of this LOMR. The map panel 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.