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HomeMy WebLinkAboutSANCTUARY WEST - FDP - FDP110004 (FORMERLY 30-07A) - CORRESPONDENCE - CITY STAFF (13)Terms to Note Lowest Floor Elevation — Elevation of the lowest floor of the lowest enclosed area (including bottom of basement or crawlspace). This is not the same as Finished floor. The lowest floor should be distinguished from finished Moor on plans and reports. Regulatory Flood Protection Elevation For all floodplains except the Poudre River, the regulatory Flood protection elevation is eighteen (18) inches above the base Flood elevation. For the Poudre River Floodplain, the regulatory Flood protection elevation is twenty-four (24) inches above the base Flood elevation. If there is both a FEMA and a City BFE, the higher BFE should be used to determine the regulatory Flood protection elevation. Additional Floodplain terminology is defined in Chapter 10 of City Code. NOTE: Issues specific to individual sites may arise that result in additional requirements. These will be discussed during initial meetings with the applicant. (fje� City BFE at upstream end of structure FEMA BFE at upstream end of structure (if different than City BFE) VAt- Regulatory flood protection elevation Lowest Floor elevation (bottom of basement or crawl space is considered lowest Floor) //4-- Floodproofing elevation for non-residential structures (if applicable) rll- Garage slab elevation HVAC elevation Elevations are referenced to the appropriate datum: FEMA basins - list in both NGVD 29 and NAVD 88 City basins - list only in NGVD 29, P/G, r � If the floodplain use permit is not going to be submitted until the building permit is applied for, then a note must be included in the report that states the permit will be submitted at the time of building permit application. If floodproofing information is not submitted as part of the plans, then a note must be in the report stating that floodproofing information will be submitted at the time of the building permit application. ✓' {�' A note is in the report stating that a FEMA elevation or floodproofing certificate will be completed and approved before the CO is issued. In the compliance section, Chapter 10 of City Code is listed. Floodplain Use Permit Floodplain Use Permit has been submitted for each structure. Permit fee has been submitted All information on permit matches the plans All information on permit meets Foodplain regulations FEMA CLOMR Approval FEMA has approved any necessary CLOMRs. Additional Comments: A note is on the plans stating the a� MA elevation or floodproofing certificate will be completed and approved before the CO is issued. This is required even if property is only in a City flood. Drainage Report X The site is desctibed as being in the floodplain. Floodplain name and if the floodplain is a FEMA or City -designated is described. Any floodway or erosion buffer zones on the site are described. X The FEMA FIRM panel # and date and/or the Master Plan information is cited. X A copy of the FIRM panel with the site location marked is included in the report. xIf a floodplain modeling report has been submitted, that report is referenced. The reason for the floodplain modeling report is described. "1 r— if a FEMA CLOMR or LOMR has been approved for the site, the case number is referenced. The reason for the CLOMR or LOMR is described. A_ If a FEMA LOMR is required after construction, this is stated in the report. X The location of the structures relative to the floodplain is described. If there is both a FEMA and a City floodplain on the site, the location of the structures relative to both is described. �C The use of the structures is described. This is to determine if the structure is residential, non-residential, or mixed -use. Also, structures in all IW-year and Poudre River 500-year floodplains cannot he used as a critical facility. (See Chapter 10 of City Code for definitions.) The report describes how the development is in compliance with the applicable tloodplain regulation (Chapter 10 of City Code). (Examples: elevation of lowest floor above regulatory flood protection elevation, floodproofing, floodway regulation, erosion buffer zone regulation, no -rise, etc.) �C The type of foundation construction for the structures (i.e. slab -on -grade, crawl space, basement, etc.) is discussed in the report. Al,e�j-- The ty a of foundation matches with the lowest floor elevations and grading plan. J�i 'titer if any of the garages are not going to be elevated above the regulatory food protection elevation, the hydraulic venting requirements are discussed. IA/ For structures in the floodplain, a table is included (same table as on the Drainage/Grading Plan) that lists the following: Regulatory flood protection elevation Lowest floor elevation (bottom of basement or crawl space is considered lowest floor) I % Floodproofing elevation for non-residential structures (if sriplicable) Garage slab elevation HVAC elevation The BFE at upstream end of structures are correct based on interpolation between the cross -sections. The regulatory flood protection elevation is correct. The lowest floor and HVAC are at or above the regulatory flood protection elevation. Elevations are referenced to the appropriate datum: FEMA basins — list in both NGVp 29 and NAVD 88 City basins — list only in NGVV29 A typical drawing detail is inclu each foundation type proposed (slab -on - grade, basement, crawl space sh tag the elevation of the HVAC and lowest floor elevation (which includes �ottm the basement or crawl space) relative to the BFE. If garage is not elevated to tt detail is included showing ve There is I square The bottom of t4i The venting is,Un downstream side! If a non-residential All requ been e rggulatory flood protection elevation, then a drawing placement, size, and number, mch of venting for every I square foot of enclosed area. venting is not higher than 1 foot above grade. at least two sides, preferably on upstream and . (Does not have to be divided equally). is to be floodproofed, one of these conditions is met: on separate sheet titled "Floodproofing Guidelines" have I7dproof' ng information is not submitted as part of the plans, then a non the plans stating that Foodproofing information will be stted at the time of the building permit application. For man actured homes, all submittal requirements on separate sheet titled "Install ion of a Mobile Home Located in a Floodplain: Submittal Requirements" have b6en met. If a floodplain use permit is not going to be submitted until the building permit is applied for, then a note is on the plans stating that the floodplain use permit will be submitted at the time of building permit application. No structures allowed. / No additions to existing structures allowed. / Any fencing is split -rail design and break7oday, but cabled. Must be oriented parallel to general flow directi No detention or water quality o No bike or pedestrian path, o s except as required to cross streams or waterways. Road, bicycle and r' bridges must span erosion buffer zone. No fill. No outdoor storage non-residential materials or equipment. No driveways or parking areas. No irrigated vegetation and non-native trees, grasses, or shrubs. No utilities except as necessary to cross streams or waterways. No gradiryl(lor excavation except as required for permitted activities in erosio utter zone. No nstruction traffic except as required for permitted activities in lion buffer zone. Any construction in the erosion buffer zone shows that it will not impact the channel stability. V% A note is on the plans about the above erosion buffer zone restrictions. Any necessary floodplain modeling has been submitted and approved. All modeling must follow the City's floodplain modeling guidelines. Special Poudre River Regulations Poudre River Floodway Regulations have been met. No construction of new residential, non-residential or mixed -use structures. No redevelopmer� sidential, non-residential or mixed -use structures. No additions Qoel* ential, non-residential or mixed -use structures. No fill unless aulic analysis shows "no-riu". Poudre River floodp n regulations have been met No coI truction of new residential or mixed -use structures N dditions to residential structures o additions to mixed -use structures if there is an expansion in the j residential -use area of the structure. No floatable materials on non-residential sites Information Related to Structures in the Floodplain For structures in the Flood ai�a iee hown that lists the following: City BFE attts'tre- end of structure FEMA BFErn en d of structure (if different than City BFE) Floodway boundary Erosion buffer zones Cross-section locations BFE lines ✓ :,- - �" Lowest floor elevation of structures (bottom of basement or crawl space is considered the lowest floor) The floodplain and floodway boundaries are in the correct location and labeled properly. The cross-section and BFE lines are in the correct location and labeled properly f i OW-1I Y jt, Ll/' rV1GoL Elevations are referenced to the appropriate datum: FEMA basins - list in both NGVD 29 and NAVD 88 City basins - list only in NGVD 29 t - Floodway regulations have been met. X No fill in the floodway unless a hydraulic analysis shows "no -rise". Nib No manufactured homes, except in an existing park, can be placed in the floodway. No changing a nonconforming non-residential or mixed use structure to a residential structure. Landscaping meets requirements for no encroachment in the floodway without a hydraulic analysis to show "no -rise". No storage of materials or equipment. A note is on the plans about the above floodway restrictions. "l- Critical facilities regulations have been met: 100 year - no life safety, emergency response or hazardous material critical facilities 500 year Poudre - no life safety or emergency response critical facilities Any pedestrian bridges in the floodway that are not able to pass the 100-year flow are designed to be "break -away". Fences in the floodway will not block conveyance. Example: split -rail fence cabled together to not float, flap at bottom of privacy fence to allow water through (flap at BFE or above). f - L� d��-:;�cti., g_:,,,-,r/.r,c11� ;� bV�%ral'^ � �'`�d✓.><' /Any items in the floodway that can float (Example: picnic tables, bike racks, etc.) are 1 noted as being anchored. jJ74— Erosion Buffer Zone requirements have been met: Design of any allowed development minimizes disturbance to channel bed and banks. City of Fort Collins Floodplain Review Checklist 100% Development Review Submittals Instructions: Complete this checklist by marking all boxes that have been adequately completed. Put an "NA" next to any items that are not applicable to this particular submittal. Any boxes that are left blank and do not have an "NA" marked next to them are considered incomplete. Date of Review: `//2 G/ Reviewer's Name: Plat Mao The following required items are on the plat 100-year floodplain boundary - r-� f,' ( r = City NA— FEMA Floodway boundary r<<<, _ City +-- FEMA The benchmark number and elevation of benchmark IVi� These items match the FIRM. (FEMA Basin) These items match the Master Plan. (City Basin) / h0w The benchmark number and elevation match with those published in the City of Fort Collins benchmark system. 111 64^&1- L /1? � , t Site Plan 0 The following required items are on the site plan: 100-year floodplain boundary- FEMA and City r ' AA— 500-year floodplain boundary (if proposed structure is a "critical facility" and a 500-year floodplain is mapped) Floodway boundary Erosion buffer zones Restrictions related to use (ie. critical facility or no residential use of lower floor if Floodproffed mixed use structure) Drainage and/or Gradint Plan (or a separate Floodplain Sheet if it is too cluttered on Drainage and Grading Plan) The following required items are on the drainage and/or grading plan: I(k)-year floodplain boundary- FEMA and City - . 500-year Iloodplain boundary (if proposed structure is a "critical facility" and a 500-year floodplain is mapped) W City of ,ret Collins branches and cause water surfaces to rise. Smaller plants must be able to lie down under flood flows to ensure no blockage of conveyance. Willows often do not have the flexibility needed to lie down under flood flows. 25) Landscape Plan - Please add note to plans: Placement of new vegetation in the floodway in location or of a quantity or type that is determined to likely result upon maturity in an increase in base flood elevations is prohibited. 26) Please include benchmark information and standard notes detailed below on the Plat, Landscape Plan and Site Plans, Utility Plan (General Notes), Grading. Plan, and Overall Floodplain sheet. a. Portions of this property are located in the City 100-year flood fringe and floodway of the West Vine Basin, and are subject to the requirements of Chapter 10 of City Code. b. No storage of materials or equipment shall be allowed in the floodway. Whether temporary (during construction) or permanent. c. An approved floodplain use permit is required for each site construction element (landscaping, fencing, roadway, detention ponds, bike paths, parking lot, utilities etc.) in the floodplain prior to mobilization. d. No -rise certification is required for all site work including landscaping within the floodway. Re -certification of no -rise is required for as -built conditions. e. See floodplain exhibit on sheet xx for cross-section locations, BFE lines, and other additional floodplain information. Thank you for your continued efforts on this project. If there are any questions or concerns, please contact us during regular business hours so we may assist you in the expeditious approval of your project as it pertains to floodplain management requirements. Sincerely, Brian K. Varrella, P.E., CFM Floodplain Administrator Page 3 of 3 City of F&I Collins 7) As all structures are out of the IW-year floodplain, there is no floodplain requirement to elevate these structures. Remove all language related to the elevation of basements, garages and structures that are not necessary. 8) include a note indicating the vertical datum and units used for the elevations. 9) Include information specifically on how the project is in compliance with Chapter 10 of City Code. 10) Include information that an approved floodplain use permit is required for each site construction element (roadway, fences, landscaping, bike paths, parking lot, utilities etc.) in the floodplain prior to mobilization. 11) Please add to the no -rise note that re -certification of no -rise will be completed for as -built conditions. 12) Appendix: Please add the site to scale on the FIRM map. Please add a scale to the flood risk map. Please number appendix documents. Plans 13) Please modify and resolve per redlines. 14) Include the most up to date floodplain boundaries from the URS floodplain modeling report dated March, 2011. 15) Ensure 100-year floodplain (current effective), floodway (current effective), I00-year floodplain (proposed), floodway (proposed) are included on plans and clearly delineated and labeled. Use different line types and line weight if necessary. 16) Change nomenclature to "current effective" and "proposed" for floodplain boundaries. 17)Check floodway and floodplain line work. Floodway appears to exceed the boundaries of the floodplain in some locations. 18) Check cross section lines on Overall Floodplain sheet. These must reflect those shown and utilized in the floodplain modeling report. 19) Plat, please remove BFE lines. 20) Please include benchmark information on Plat, landscape and Site Plans. 21)Landscape and Site Plans, Please include floodplain exhibit. 22) Landscape and Site Plans, fencing within the floodway must meet Chapter 10 requirements. Fence must be break away and cabled together to be non-floatable, or can be designed to allow passage of water by having a flap or opening in areas below the base flood elevation sufficient to allow floodwater to pass freely. Please contact Brian Varrella (bvarrella@fcgov.com) for standard fence detail. 23) Landscape Plan - Per Chapter 10 of City Code, ensure any floatable materials in the floodway are anchored such as bicycle racks. 24) Landscape Plan - Per Chapter 10 of City Code, placement of new vegetation in the floodway in a location or of a quantity or type that is determined to likely result upon maturity in an increase in base flood elevations is prohibited. Please review plant types in the floodway to ensure they meet this requirement. Evergreen trees often block conveyance with low Page 2 of 3 ;arof t` Collins April 29, 2011 Mr. William Veio c/o Solitaire Homes 6645 E. Heritage Place South Englewood, CO 80111 Utilities electric . stonnwater . wastewater . water 700 Wood St. PO Box 580 Fort Collins, CO 80522 970.221.6700 970,221.6619 fax . 970,224,6003 TDD utifihes®fcgovcom . fcgovcom/utififies RE: Floodplain Comments; Sanctuary West Final Plans dated 3/1/11. Mr. Veio, The City of Fort Collins received Final Plat, Utility, Landscape and Site Plans, Drainage Report and Floodplain Modeling Report for review. The City has reviewed the information provided and would like to provide the following comments to facilitate an expeditious review. Ultimately, it is the City's intent to assist the engineer through the review process, and assist in the resolution of these comments and concerns to the best of our abilities. The necessary revisions contained herein will lead to further review. General Comments: 1) A copy of the City of Fort Collins Floodplain Checklist 100% Development Review Submittals is included as attachment along with redlines. Floodplain Modeling Retort 2) Information contained within the floodplain modeling report warrants further investigation. Comments for this submittal will be delivered on Tuesday, May 3, 2011. Floodolain Use Permits 3) An approved floodplain use permit is required for each site construction element (landscaping, fencing, roadway, detention ponds, bike paths, parking lot, utilities etc.) in the floodplain prior to mobilization. Drainage Report 4) Please modify and resolve per redlines. 5) Please include floodplain modeling report date when referencing. 6) Please include a statement why the modeling report was needed (proposed roadway through the floodway caused a rise that needed to be mitigated?). Include statements that the floodplain boundaries were changed with this process and documented through the floodplain modeling report.