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HomeMy WebLinkAboutPARADIGM PROPERTIES - ODP - 29-01A - CORRESPONDENCE - (9)• A floodplain use permit and $25 permit fee will be required for each structure that is built in the floodplain. To obtain a CO, an elevation certificate or floodproofing certificate will be required to be submitted and approved. Department: Transportation Planning Issue Contact: Tom Reiff Topic: general Number: 62 Created: 9/4/2003 No further comments on the ODP. Additional comments will follow at the PDP stage. This ODP is considered to be in a form that is sufficient to be scheduled for a Planning and Zoning Board public hearing. The item will be placed on the October 16, 2003 Board agenda for discussion. Be sure and return all of your redlined plans when you re -submit. If you have any questions regarding these issues or any other issues related to this project, please feel free to call meat 221-6341. Yours Truly, /1 Steve Olt City Planner Page 4 properties. The modeling of the floodplain is part of the required drainage study. 3. Project note #8. The existing contours should be based off of the City's vertical datum, not the U565 vertical datum. Please see the August 12, 1998 memo from Wally Muscott, City Surveyor, concerning the City's vertical datum and the benchmarks and corresponding elevations. The City's datum is based on NGVD 1929 without the 1984 adjustment. It is critical for any information used for floodplain purposes to be on the City's vertical datum. Please review and revise the existing topography and the note to be based on the City's datum. 4. Please list the benchmark number and elevation that was used for surveying. 5. Many of the Project Notes are not accurate concerning the floodplain: • #4 states that there are no "No floodplains or Floodways on the site". This is incorrect. The site is in the Boxelder Creek Floodplain. See comment #1 above. • #25 is misleading and inaccurate. Again, the site is in the Boxelder Creek Floodplain. See comment #1 above. Please have this comment read: " The property is entirely within a floodplain. The no -rise requirement is to be met as part of the POP. A hydraulic analysis by a professional engineer will be required for all changes (fill, construction of buildings, culverts, channels, etc.) to the existing site." 6. Please add the following notes to the plan. These notes are all based on previous comments: • Any residential structures (this includes the proposed hotels) in the floodplain must have the lowest floor including basement or crawl space elevated 18" above the 100-year flood level. • Any non-residential structures in the floodplain must either have the lowest floor including basement or crawl space elevated 18" above the 100-year flood level or be floodproofed 18" above the 100-year flood level. • Critical facilities (including the proposed gas station) are not allowed to be built in the 100-year floodplain. To remove this site from the floodplain, the pumps, valves, manholes to tanks, etc. would have to be elevated 18" above the flood level, similar to a structure. Please see Chapter 10 of City Code for the definition of critical facilities. Page 3 through the site and back into the existing flow path. There is approximately 3900 cfs in the 100-year event that passes through. If channelization is proposed the downstream and maybe the upstream landowners may need to be involved to make a channel possible. Also the report does not address the outfall system for the proposed detention/water quality pond. The runoff path needs to be analyzed from the site to a "natural drainageway" and all needed improvements and easements should be identified. Topic: F/000plain Comments Number: 40 Created: 10/25/2002 9/2/03 1. The majority of the comments have been addressed adequately for an OUP. 2. Again, the hydraulic modeling information provided is not sufficient for a complete review therefore it has not been reviewed in detail. The disk mentioned in the report was not included. A full review will take place at time of PDP when more detailed site information is available. Site layout and sizing of the drainage channel may change based on further analysis. 3. The Boxelder floodway has been adopted. (See attached drawing.) All future development will be subject to floodway criteria. 10/23/02 1. The response to the comment concerning the floodplain is not appropriate. Michael B. Smith, Utilities General Manager, has adopted the revised Boxelder Creek Master Plan. The new floodplain map is based on the rainfall standard adopted by City Council in 1999. There is no intention by City staff to change the floodplain mapping since it is based on the currently adopted rainfall standard. Based on City Code Section 10-20b, this development must comply with all of the floodplain regulations. Please acknowledge this floodplain and that the development will comply with the adopted floodplain regulations. 2. Under the LUC section 2.3.2 (H), (6) & (7) which are part of the "OOP Review Procedures" the site "features" need to be shown and addressed as to how they can be incorporated into the site design. The ODP must also be consistent with the Drainage Basin Master Plans which includes the floodplains. Therefore the proposed floodplain modifications need to be modeled in enough detail to show that the ODP site uses in their proposed locations still allow the safe passage of the Boxelder flows through the site without a negative affect (no -rise) on other Page 2 6 L STAFF PROJECT REVIEW Citvof Fort Collins Hattman Assoc. Date: 9/15/2003 c/o Ric Hattman 145 West Swallow Road Ft. Collins, CO. 80525 Staff has reviewed your submittal for PARADIGM PROPERTIES, Overall Development Plan (ODP) - TYPE II (LUC) 29-01A, and we offer the following comments: ISSUES: Department: Current Planning Topic: Drainage Number: 64 Issue Contact: Steve Olt Created: 9/15/2003 Please see the Stormwater Utility note #41 (this page, dated 9/2/03) regarding the modeling requirements. A new note must be added to the ODP stating that the current layout is conceptual only and approval of the ODP does not guarantee that the site can necessarily be laid out as shown on the ODP. Detailed floodplain modeling must be done at the PDP stage(s) to support the ultimate site layout. Department: Engineering Topic: Genera/ Number: 63 No further comments at this time. Department: Stormwater Utility Issue Contact: Marc Virata Created;9/10/2003 Issue Contact: Basil Hamdan Topic:. ' age Numbe : 41 Created: 10/25/2002 9/2/03 The proposed layout would move the floodway from its existing alignment. The modeling that was done to this point is too conceptual to verify whether this new alignment would be possible without causing any rise. Please add a note to the ODP stating that this layout is conceptual only and approval of this ODP does not guarantee that the site as laid out on this ODP plan. Detailed floodplain modeling shall be done at PDP that will set the ultimate layout of the site. 10/25/02 A drainage study is required as part of the submittal requirements. The previously submitted "Conceptual Storm Drainage Report" addresses in general terms the onsite drainage plan, except that it needs to be revised to match the latest ODP layout. It also does not address the offsite flows onto the site nor how these flows are routed Page I