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Home My WebLink About20241773.tiffFederal Emergency Management Agency CERTIFIED MAIL RETURN RECEIPT REQUESTED The Honorable Mike Freeman Chair, Weld County Board of Commissioners 1150 O Street Greeley, CO 80631 Dear Mike Freeman: Washington, D.C. 20472 June 3, 2024 IN REPLY REFER TO: Case No.: 23-08-0520R Community Name: Weld County, CO Community No.: 080266 104 RECEIVED JUN 17 2024 WELD COUNTY COMMISSIONERS 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 (FIS) report and Flood Insurance Rate Map (FIRM) 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, at (303) 235-4830, or the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP). Additional information about the NFIP is available on our website at https:/www.fema.covitlood-insurance. Sincerely, Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration Enclosure: Conditional Letter of Map Revision Comment Document cc: The Honorable Tracie Crites Mayor, Town of Frederick The Honorable Claire Levy Chair, Boulder County Board of Commissioners The Honorable Justin Brooks Mayor, Town of Erie Kelly Watson, CFM Floodplain Program Planner Boulder County Kiersten Hines, P.E., CFM Water Resources Engineer Jacobs Engineering Group, Inc. Craig Baxter, P.E. Water Resources Engineer Jacobs Engineering Group, Inc. Terri Fead, P.E., CFM Floodplain Mapping Coordinator Colorado Water Conservation Board Marta Blanco Castano, GISP, CFM Flood Mapping Program Assistant Colorado Water Conservation Board Co'A pt 07(o I (2j ....r...(ERthwpA/DA/t414 °EM(RR), P.)(OH/DD) 06/26(214 2024-1773 Wendi Palmer, P.E., CFM Civil Engineer Town of Erie Diana Aungst, AICP, CFM Planner III Weld County Department of Planning Services Kevin Ash, P.E Engineering Director Town of Frederick Kevin Houck, P.E., CFM Chief, Watershed and Flood Protection Section Colorado Water Conservation Board Dawn Anderson Development Review Manager Weld County Page 1 of 6 Ilssue Date: June 3, 2024 'Case No.: 23-08-0520R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT COMMUNITY INFORMATION PROPOSED PROJECT DESCRIPTION BASIS OF CONDITIONAL REQUEST COMMUNITY Weld County Colorado (Unincorporated Areas) FILL 1D -2D HYDRAULIC ANALYSIS UPDATED TOPOGRAPHIC DATA FLOODWAY COMMUNITY NO.: 080266 IDENTIFIER Town of Erie Future Water Treatment Facility CLOMR APPROXIMATE LATITUDE & LONGITUDE: 40.0976, -105.043 SOURCE: OTHER DATUM: NAD 83 AFFECTED MAP PANELS TYPE: FIRM* NO.: 08123C2056F DATE: September 17, 2020 TYPE: FIRM NO.: 08123C2058F DATE: September 17, 2020 *FIRM - Flood Insurance Rate Map FLOODING SOURCE AND REACH DESCRIPTION Boulder Creek — From Mineral Road to approximately 1,160 feet downstream of County Road 16.5. PROPOSED PROJECT DESCRIPTION Flooding Source Proposed Project Location of Proposed Project Boulder Creek Fill Placement From Mineral Road to approximately 7,160 feet downstream of County Road 16.5. SUMMARY OF IMPACTS TO FLOOD HAZARD DATA Flooding Source Effective Flooding Proposed Flooding Increases Decreases Boulder Creek BFEs* BFEs Yes Yes Floodway Floodway Yes None Zone AE Zone AE Yes Yes Zone X (shaded) Zone X (shaded) 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 comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. (.—..-"le41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Page 2 of 6 'Issue Date: June 3, 2024 (Case No.: 23-08-0520R I CLOMR-APP nF"pR'7"��lr o Federal Emergency Management Agency r/ o°y Washington, D.C. 20472 CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) OTHER COMMUNITIES AFFECTED BY THIS CONDITIONAL REQUEST CID Number: 080266 Name: Unincorporated Areas of Boulder County, CO AFFECTED MAP PANELS TYPE: FIRM TYPE: FIRM TYPE: FIRM NO.: 08013C0429K DATE: Septeber 30, 2019 NO.: 08013C0431K DATE: Septeber 30, 2019 NO.: 08013C0433K DATE: Septeber 30, 2019 CID Number: 080181 Name: Town of Erie, CO AFFECTED MAP PANELS TYPE: FIRM TYPE: FIRM NO.: 08013C0431 K DATE: Septeber 30, 2019 NO.: 08013C0433K DATE: Septeber 30, 2019 CID Number: 080244 Name: Town of Frederick, CO AFFECTED MAP PANELS TYPE: FIRM TYPE: FIRM NO.: 08123C2056F DATE: September 17, 2020 NO.: 08123C2058F DATE: September 17, 2020 This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304- .26. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. ,('—''-'-f:141 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Page 3 of 6 Ilssue Date: June 3, 2024 (Case No.: 23-08-0520R I CLOMR-APP Federal Emergency Management Agency r Washington, D.C. 20472 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: Boulder Creek BFE Change (feet) Location of maximum change Existing vs. Effective Maximum increase None Not Applicable Maximum decrease None Not Applicable Proposed vs. Existing Maximum increase 1.3 Approximately 3,660 feet downstream of Mineral Road Maximum decrease 0.9 Approximately 3,660 feet downstream of Mineral Road Proposed vs. Effective Maximum increase 1.3 Approximately 3,660 feet downstream of Mineral Road Maximum decrease 0.9 Approximately 3,660 feet downstream of Mineral Road Increases due to the proposed project that exceed those permitted under Paragraphs (d)(3) of Section 60.3 of the NFIP regulations must adhere to Section 65.12 of the NFIP regulations. With this request, your community has complied with all requirements of Paragraph 65.12(a) of the NFIP regulations. Compliance with Paragraph 65.12(b) also is necessary before FEMA can issue a Letter of Map Revision when a community proposes to permit encroachments into the effective regulatory floodway that will cause BFE increases in excess of those permitted under Paragraph 60.3(d)(3). This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. $(1--,..141' Patrick' Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Page 4 of 6 Ilssue Date: June 3, 2024 'Case No.: 2,08-0520R I CLOMR-APP AR T Fiy'.. • Federal Emergency Management Agency $ Washington, D.C. 20472 titiNn c 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 and FIS report. If the project is built as proposed and the data below are received, a revision to the FIRM and FIS report would be warranted. • 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, entitled "Overview and Concurrence Form," must be included A copy of this form may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/paper-application-forms/mt-2. • The detailed application and certification forms listed below may be required if as -built conditions differ from the proposed plans. If required, please submit new forms, which may be accessed at https://www.fema.gov/flood-maps/change-your-flood-zone/paper-application- forms/mt-2, or annotated copies of the previously submitted forms showing the revised information. Form 2, entitled "Riverine Hydrology and Hydraulics Form." 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, must be submitted with Form 2. Form 3, entitled "Riverine Structures Form." • A certified topographic work map showing the revised and effective base, 0.2 -percent -annual -chance 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 base, 0.2 -percent -annual -chance floodplain and floodway boundary delineations shown on the submitted work map and how they tie-in to the base, 0.2 -percent -annual -chance 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 individual legal notices sent to property owners who will be affected by any widening or shifting of the base floodplain and/or any BFE increases along Boulder Creek. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 223046426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. C./-1'(;3'•4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Page 5 of 6 Ilssue Date: June 3, 2024 (Case No.: 23-08-0520R I CLOMR-APP Ilik Federal Emergency Management Agency IND SGc�; Washington, D.C. 20472 'Mon CONDITIONAL LETTER OF MAP REVISION COMMENT DOCUMENT (CONTINUED) COMMUNITY INFORMATION (CONTINUED) DATA REQUIRED FOR FOLLOW-UP LOMR (continued) • FEMA's fee schedule for reviewing and processing requests for conditional and final modifications to published flood information and maps may be accessed at hops: www.fema.gos' flood -maps change -your -flood -zone status 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 either forward the payment, along with the revision application, to the following address: Colorado Water Conservation Board 1313 Sherman Street, Room 718 Denver, CO 80203 or submit the LOMR using the Online LOMC portal at: https://hazards.fema.gov/femaportal/onlinelomc/signin After receiving appropriate documentation to show that the project has been completed, FEMA will initiate a revision to the FIRM and FIS report. Because the flood hazard information (i.e., base flood elevations, 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 Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. .C/:,'../4/ Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Page 6 of 6 Ilssue Date: June 3, 2024 (Case No.: 23-08-0520R I CLOMR-APP Federal Emergency Management Agency Washington, D.C. 20472 IgND stc 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: Jeanine P. 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 We are processing a revised flood hazard study for Boulder County under the Colorado Hazard Mapping Program (CHAMP). As a condition of this CLOMR, tie-in to the currently effective Flood Insurance Study report and Flood Insurance Rate Map for Boulder County, dated December 7, 2017 and December 18, 2012, respectively, are not being required. All changes proposed herein will be incorporated into the CHAMP anaylsis upon completion of the project, and are not intended for incoporation into currently effective flood hazard data in Boulder County. This comment is based on the flood data presently available. If you have any questions about this document, please contact the FEMA Mapping and Insurance eXchange (FMIX) toll free at 1-877-336-2627 (1-877-FEMA MAP) or by letter addressed to the LOMC Clearinghouse, 3601 Eisenhower Avenue, Suite 500, Alexandria, VA 22304-6426. Additional Information about the NFIP is available on the FEMA website at https://www.fema.gov/flood-insurance. ,-.1e/41 Patrick "Rick" F. Sacbibit, P.E., Branch Chief Engineering Services Branch Federal Insurance and Mitigation Administration 23-08-0520R 104 Hello