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Home My WebLink About20143126.tiff Federal Emergency Management Agency xo ` J Washington, D.C. 20472 PColo st" September 30,2014 CERTIFIED MAIL IN REPLY REFER TO: RETURN RECEIPT REQUESTED Case No.: 14-08-1088R Community Name: Weld County,CO The Honorable Douglas Rademacher Community No.: 080266 Chairman,Weld County Board of Commissioners P.O.Box 758 Greely,CO 80632 Dear Mr.Rademacher: We are providing our comments with the enclosed Conditional Letter of Map Revision(CLOMR)on a proposed project within your community that,if constructed as proposed,could revise the effective Flood Insurance Study report,Flood Insurance Rate Map,and Flood Boundary and Floodway Map for your community. If you have any questions regarding the floodplain management regulations for your community,the National Flood Insurance Program(NFIP)in general,or technical questions regarding this CLOMR,please contact the Director, Mitigation Division of the Federal Emergency Management Agency(FEMA)Regional Office in Denver,Colorado,at (303)235-4830,or the FEMA Map Information eXchange(FMIX)toll free at 1-877-336-2627(1-877-FEMA MAP). Additional information about the NFIP is available on our website at http://www.fema.gov/nfip. Sincerely, Luis Rodriguez,P.E.,Chief Engineering Management Branch Federal Insurance and Mitigation Administration List of Enclosures: Conditional Letter of Map Revision Comment Document cc: Mr.Tom Parko,M.A. Director of Planning Services Weld County Department of Planning Services Mr.Ryan Idler,P.E. Professional Engineer I Colorado Department of Transportation Ms.Galina S.Leiphart,P.E. Project Manager Tsiouvaras Simmons Holdemess,Inc. Mr.George Cotton,P.E. Senior Engineer Tsiouvaras Simmons Holdemess,Inc. e1 i1MM1 UI • 0 2014-3126 )0- 13-Ropy • Page 1 of 6 Ilssue Date:September 30,2014 (Case No.:14-08-1088R I CLOMR-APP OFF/'-\e U/e, Federal Emergency Management Agency ° E Washington, D.C. 20472 'Imo st CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST Weld CountyBRIDGE FLOODWAY ColoradoCULVERT HYDRAULIC ANALYSIS (Unincorporated Areas) FILL NEW TOPOGRAPHIC DATA COMMUNITY COMMUNITY NO.:080266 APPROXIMATE LATITUDE&LONGITUDE: 40.393,-104.635 IDENTIFIER US-34 Permanent Repair/CDOT Project No.20068 SOURCE: Precision Mapping Streets DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM` NO.: 0802660637C DATE: September 28,1982 •FIRM-Flood Insurance Rate Map ••FBFM-Flood Boundary and Floodway Map TYPE: FIRMS NO.: 08026806390 DATE: September 28,1982 TYPE: FBFM•• NO.: 0802660007 DATE: September 28,1990 TYPE: FBFM•• NO.: 0802660010 DATE: September 28,1990 FLOODING SOURCE(S)AND REACH DESCRIPTION Se*Pegs 2 tor Additional Flooding sours South Platte River—from approximately 1,340 feet upstream of East 18th Street(Weld County Road 58)to just downstream of East 37th Street(Weld County Road 54) PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project South Platte River Grading/Fill Along US Highways 34A and 34D SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases South Platte River Floodway Floodway Yes Yes Zone AI-A30 Zone AE Yes Yes BFEs• BFEs Yes Yes •BFEs-Base(1-percent-annual-chance)Flood Elevations COMMENT This document provides the Federal Emergency Management Agency's(FEMA's)comment regarding a request for a CLOMR for the project described above. This document is not a final determination;it only provides our comment on the proposed project in relation to the flood hazard information shown on the effective National Flood Insurance Program(NFIP)map. We reviewed the submitted data and the data used to prepare the effective flood hazard information for your community and determined that the proposed project meets the minimum floodplain management criteria of the NFIP. Your community is responsible for approving all floodplain development and for ensuring that all permits required by Federal or State/Commonwealth law have been received. State/Commonwealth, county,and community officials,based on their knowledge of local conditions and in the interest of safety,may set higher standards for construction in the Special Flood Hazard Area(SFHA),the area subject to inundation by the base flood. If the State/Commonwealth,county,or community has adopted more restrictive or comprehensive floodplain management criteria,these criteria take precedence over the minimum NFIP criteria. This continent is based on the flood data presently available. If you have any questions about this document please contact the FEMA Map Information eXchange(FMIX)toll free at 1-877-336-2827(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street,Alexandria,VA 22304. Additional Information about the NFIP is available on the FEMA website at http:/Avww.fema.gov/nflp. C--=> Luis Rodriguez,P.E.,Chief Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Page 2 of 6 Ilssue Date:September 30,2014 ICase No.:14-08-1088R I CLOMR-APP OFRA�\R ° Federal Emergency Management Agency °y � Washington, D.C. 20472 (Iwo SE 057 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) ADDITIONAL FLOODING SOURCES AFFECTED BY THIS CONDITIONAL REQUEST FLOODING SOURCE(S)AND REACH DESCRIPTION South Platte River Breach Reach—from the confluence with the South Platte River to approximately 4,260 feet upstream of US Highway MA South Platte River Spill Reach—from the confluence with the South Platte River to the divergence from the South Platte River Breach Reach PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project South Platte River Breach Reach New Bridge At US Highway MA Grading/Fill Along US Highway 34A South Platte River Spill Reach New(12 by 6)Box Culvert At US Highway MA Grading/Fill Along US Highway MA SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases South Platte River Breach Reach No Floodway Floodway Yes None Zone A1-A30 Zone AE Yes Yes BFEs* BFEs Yes Yes South Platte River Spill Reach No Floodway Floodway Yes None Zone Al-A30 Zone AE Yes Yes BFEs BFEs Yes Yes •BFEs-Base(1-percent-annual-chance)Flood Elevations available. 8have questions about thisplease contact the FEMA Information eXchange(FMIX)toll This comment is based on the flood data presentlyyou any document, Map free at 1-877.336-2627(1-877-FEMA MAP)or letter addressed to the LOMC Clearinghouse,847 South Pickett Street,Alexandria,VA 22304. Additional Information about by the NFIP is available on the FEMA website at http://bwAviema.govinflp. Luis Rodriguez,P.E.,C�ef Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Page 3 of 6 tissue Date:September 30,2014 'Case No.:14-08.1088R I CLOMR-APP itpART ' :16)) Federal Emergency Management Agency ° Washington, D.C. 20472 '1ND Sg1Ar CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION To determine the changes in flood hazards that will be caused by the proposed project,we compared the hydraulic modeling reflecting the proposed project(referred to as the proposed conditions model)to the hydraulic modeling used to prepare the Flood Insurance Study(FIS)(referred to as the effective model). If the effective model does not provide enough detail to evaluate the effects of the proposed project,an existing conditions model must be developed to provide this detail. This existing conditions model is then compared to the effective model and the proposed conditions model to differentiate the increases or decreases in flood hazards caused by more detailed modeling from the increases or decreases in flood hazards that will be caused by the proposed project. The table below shows the changes in the BFEs: BFE Comparison Table Flooding Source: BFE Change(feet) Location of maximum change South Platte River Existing vs. Maximum increase 3.6 Approximately 480 feet upstream of US Highway 34A Effective Maximum decrease 1.2 Approximately 110 feet downstream of US Highway 34D Proposed vs. Maximum increase 0.2 Approximately 7,700 feet upstream of US Highway 34A Existing Maximum decrease 3.9 Approximately 300 feet downstream of US Highway 34A Proposed vs. Maximum increase 0.8 Approximately 2,410 feet downstream of US Highway 34D Effective Maximum decrease 2.3 Approximately 1,190 feet upstream of US Highway 34D Flooding Source: BFE Change(feet) Location of maximum change South Platte River Breach Reach Proposed vs. Maximum increase 0.7 Approximately 620 feet downstream of US Highway 34A Existing Maximum decrease 5.0 Just upstream of US Highway 34A Flooding Source: BFE Change(feet) Location of maximum change South Platte River Spill Reach Proposed vs. Maximum increase None N/A Existing Maximum decrease 3.3 Approximately 190 feet upstream of US Highway 34A NFIP regulations Subparagraph 60.3(6)(7)requires communities to ensure that the flood-carrying capacity within the altered or relocated portion of any watercourse is maintained. This provision is incorporated into your community's existing floodplain management ordinances;therefore,responsibility for maintenance of the altered or relocated watercourse,including any related appurtenances such as bridges,culverts,and other drainage structures,rests with your community. We may request that your community submit a description and schedule of maintenance activities necessary to ensure this requirement. This comment is based on the flood data presently available. If you have any questions about this document,please contact the FEMA Map Information eXchange(FMIX)toll free at 1-877-338-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street,Alexandria,VA 22304. Additional Information about the NFIP is available on the FEMA website at http/Awm.fema.goWnfip. Luis Rodriguez,P.E.,Chief Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Page 4 of 6 (Issue Date:September 30,2014 ICase No.:14-08.1088R I CLOMR-APP 42. Federal Emergency Management Agency °y Washington, D.C. 20472 .tqND SF0'J CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR Upon completion of the project,your community must submit the data listed below and request that we make a final determination on revising the effective FIRM,FBFM,and FIS report. If the project is built as proposed and the data below are received,a revision to the FIRM,FBFM,and FIS report would be warranted. •Form I,entitled"Overview&Concurrence Form." Detailed application and certification forms must be used for requesting final revisions to the maps. Therefore,when the map revision request for the area covered by this letter is submitted,Form 1 must be included. If as-built conditions differ from the proposed plans,please submit new forms,which may be accessed at http://www.fema.gov/mt-2- application-forms-and-instructions,or annotated copies of the previously submitted forms showing the revised information. •Hydraulic analyses,for as-built conditions,of the base flood;the 10-percent,2-percent,and 0.2 percent annual chance floods;and the regulatory floodway,together with a topographic work map showing the revised floodplain and floodway boundaries.Please ensure that the revised information ties in with the current effective information at the downstream and upstream ends of the revised reach. •An annotated copy of the FIRM,at the scale of the effective FIRM,that shows the revised floodplain and floodway boundary delineations shown on the submitted work map and how they tie into the floodplain and floodway boundary delineations shown on the current effective FIRM at the downstream and upstream ends of the revised reach. •As-built plans,certified by a registered professional engineer,of all proposed project elements. •A copy of the public notice distributed by your community,stating its intent to revise the regulatory floodway,or a signed statement by your community that it has notified all affected property owners and affected adjacent jurisdictions. •Documentation of the notification to property owners who will be affected by any widening/shifting of the base floodplain and/or any BFE increases along the South Platte River,South Platte River Breach Reach,and South Platte River Spill Reach. This comment is based on the flood data presently available. If you have any questions about this document please contact the FEMA Map Information eXchange(FMB()toll free at 1-877-336-2827(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street,Alexandria,VA 22304. Additional Information about the NFIP is available on the FEMA website at http://wvnv.fema.gov/nflp. Is Rodriguez,P.E.,Chief Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Page 5 of 6 Ilssue Date:September 30,2014 Case No.:14-08-1088R I CLOMR-APP OFPAl e 4. Yl o - • Federal Emergency Management Agency 4.c . ` c Washington, D.C. 20472 CqND sEG . CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) •A letter stating that your community will adopt and enforce the modified regulatory floodway,OR,if the State/Commonwealth has jurisdiction over either the regulatory floodway or its adoption by your community,a copy of your community's letter to the appropriate State/Commonwealth agency notifying it of the modification to the regulatory floodway and a copy of the letter from that agency stating its approval of the modification. •FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed athttp://www.fema.gov/flood-map-related-fees. The fee at the time of the map revision submittal must be received before we can begin processing the request. Payment of this fee can be made through a check or money order,made payable in U.S.funds to the National Flood Insurance Program,or by credit card(Visa or MasterCard only). Please forward the payment,along with the revision application,to the following address: LOMC Clearinghouse 847 South Pickett Street Alexandria,VA 22304 After receiving appropriate documentation to show that the project has been completed,FEMA will initiate a revision to the FIRM,FBFM, and FIS report. Because the flood hazard information(i.e.,BFEs,base flood depths,SFHAs,zone designations,and/or regulatory floodways)will change as a result of the project,a 90-day appeal period will be initiated for the revision,during which community officials and interested persons may appeal the revised flood hazard information based on scientific or technical data. This comment is based on the flood data presently available. If you have any questions about this document,please contact the FEMA Map Information exchange(FMIX)toll free at 1477-338-2827(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street,Alexandria,VA 22304. Additional Information about the NFIP is available on the FEMA website at http:/Mwaw.fena.gov/nflo. Luis Rodriguez,P.E.,Ctaef Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Page 6 of 6 tissue Date:September 30,2014 (Case No.:14-08-1088R I CLOMR-APP cpA��Mae 't �� Federal Emergency Management Agency x°y � Washington, D.C. 20472 D stc7�1�N'�...,.- CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) COMMUNITY REMINDERS We have designated a Consultation Coordination Officer(CCO)to assist your community. The CCO will be the primary liaison between your community and FEMA. For information regarding your CCO,please contact: Ms.Jeanine D.Petterson Director,Mitigation Division Federal Emergency Management Agency,Region VIII Denver Federal Center,Building 710 P.O.Box 25267 Denver,CO 80225-0267 (303)235-4830 A preliminary study is being conducted for Weld County,Colorado and Incorporated Areas. Preliminary copies of the revised FIRM and FIS report were submitted to your community for review on May 31,2013,and may become effective before the revision request following this CLOMR is submitted. Please ensure that the data submitted for the revision ties into the data effective at the time of the submittal. The downstream end of the proposed revision for the South Platte River overlaps with a CLOMR currently under review(Case No. 14-08- 0841R.). If a Letter of Map Revision(LOMR)to follow this CLOMR is required after issuing a LOMR to follow Case No. 14-08-084IR, all models and SFHA and floodway boundary delineations must be modified to tie into the effective information. This comment is based on the flood data presently available. If you have any questions about this document,please contact the FEMA Map Information exchange(FMIX)toll free at 1-877338-2627(1-877-FEMA MAP)or by letter addressed to the LOMC Clearinghouse,847 South Pickett Street.Alexandria,VA 22304. Additional Information about the NFIP is available on the FEMA website at http:F .fema.govinflp. Luis Rodriguez,P.E.,Chief Engineering Management Branch Federal Insurance and Mitigation Administration 142877 PT202.BKR.14081088R.BG 104 Hello