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<br />Federal Emergency Management Agency
<br />Washington, D.C. 20472
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<br />CERTIFIED MAIL
<br />RETURN RECEIPT REQUESTED
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<br />IN REPLY REFER TO:
<br />Case No,: 95-08-l26P
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<br />The Honorable Mark Williams
<br />Mayor, Town of Castle Rock
<br />P,O, Box 8000
<br />Castle Rock, Colorado 80104-8000
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<br />Community: Town of Castle Rock, Colorado
<br />Community No,: 080050
<br />Panels Affected: 0170 C and 0186 C
<br />Effective Date of
<br />This Revision: AUG 0 71995
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<br />102-I-C
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<br />Dear Mayor Williams:
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<br />This is in response to a request for a revision to the effective Flood Insurance Study and National Flood
<br />Insurance Program (NFIP) map for your community, Specifically, this responds to a letter dated May 17,
<br />1995, from Mr, Daniel W, Bare II, P,E" Engineer III, Town of Castle Rock, regarding the effective
<br />Flood Insurance Rate Map (FIRM) for the Town of Castle Rock, Colorado, With his letter, Mr, Bare
<br />provided additional data to support his February 28, 1995, request for a Letter of Map Revision (LOMR),
<br />Mr. Bare requested that the Federal Emergency Management Agency (FEMA) revise the effective FIRM
<br />to show the effects of construction of a storm water sewer system and a detention pond along Tributary C
<br />from approximately 400 feet downstream of Interstate Highway 25 (1-25) to just downstream of the
<br />Denver and Rio Grande Western Railroad, A portion of the project area shown on the FIRM as within
<br />Douglas County, from approximately 350 feet downstream ofI-25 to just upstream ofU,S, Highway 85,
<br />has been annexed by the Town of Castle Rock,
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<br />All data required to complete our review of this request were submitted with Mr, Bare's February 28 and
<br />May 17 letters and a letter dated April 17, 1995, from Ms, Vera B, Stepanek, P,E" Design Engineer,
<br />Rocky Mountain Consultants, Inc. All fees necessary to process this LOMR, a total of $2,820, have been
<br />received,
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<br />We have completed our review of the submitted data and the flood data shown on the effective FIRM,
<br />and have revised the FIRM to modify the floodplain boundary delineations of a flood having a I-percent
<br />chance of being equaled or exceeded in any given year (base flood) along Tributary C from approximately
<br />350 feet downstream of 1-25 to just downstream of the Denver and Rio Grande Western Railroad,
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<br />As a result of this project, the flow from the base flood previously carried by Tributary C was diverted
<br />into the storm water sewer system and through the detention pond, The Special Flood Hazard Area
<br />(SFHA) was removed along the storm water sewer system from approximately 400 feet downstream of
<br />1-25 to just downstream of the Denver and Rio Grande Western Railroad, However, the SFHA width
<br />increased by a maximum of 200 feet at the backwater area from approximately 230 feet upstream to
<br />approximately 180 feet upstream of U ,S, Highway 85, and increased by a maximum of 500 feet at the
<br />detention pond from approximately 450 feet upstream to approximately 250 feet upstream of Highway 85,
<br />The property affected by the increased SFHA is owned by the requester.
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