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4 - Call Up: Elmer's Twomile Creek Construction Floodplain Development Permit (LUR2009-00017) MEMORANDUM TO: Planning Board PROM: Katie Knapp, Civil Engineer, Floodplain and Wetlands Permitting DA"TE: February 26, 2009 Si)I3JECT: Call Up Item: F,lmer's Twomile Creek Construction Floodplain Development Pern~it (LUR2009-00017) "Phis decision may be called up before Planning Board on or before March 12, 2009 A Floodplain Development Permit was approved by Planning and Development staff on February 26, 2009. "I'he work is associaicd with the construction of the Elmer's Twomile Creek irnproverncnts. A floodplain development permit was previously issued for the Elmer's Twomile Creek charu~el improvements which are currently under constnrction (LUIZ2008-00068). This previously issued permit did not include temporary construction items or permanent structures that will be constructed after the channel improvements are complete. The channel improvements will result in the adoption of new floodplain mapping. A new floodplain developtncnt pernlit (LUR2009-00017) was approved on February 26, 2009 to cover items that were not included in the original floodplain development. permit and includes: - Temporary constnrction items such as fencing, asphalt parking areas, equipment storage, dumpsters and recycle bins - Permanent structures such as carports, fencing, and landscaping that will be installed after the channel improvements are completed, but prior to the adoption of the new floodplain mapping "the applicant has demonstrated that the project will not adversely impact the floodplain or cause a rise in the floodwater elevation during the lU0-year flood event. A copy of the floodplain development permit and the application materials are attached. "Phis floodplain development permit was approved by Planning and Development Services staff on February 26, 2009, and the decision may be called up before Planning Board on or before March 12, 2009. "there is one Planning Board meeting within the required l4-day call-up period on March 5, 2009. Questions regarding this floodplain development permit should be directed to Katie Knapp in Planning and Development Services at 303-441-3273 or kn~pk~c~,bouldercolorado.~ov_ Attachments: A. Floodplain Development Permit . B. Application materials I CITY OF BOULDER ATTACHMN;~1T A •l/:; ~ Planning and Development Services 1739 Broadway, Third Floor P.O. Box 791, Boulder, CO 80306-0791 phone 303-441-1880 fax 303-441-3241 web boulderplandevelop.net Land Use Review Floodplain Development Permit Date Issued: February 26, 2009 Expiration Date: February 27, 2012 (Pursuant to Subsection 9-3-6(e), B.R.C. 1981) Permit Number: LUR2009-00017 Contact Information ANNIE NOBLE PO BOX 791 BOULDER, CO 80306 303-441-3242 Project Information Location: ELMERS TWO MILE CREEK Legal Description: Description of Work: FLOODPLAIN DEVELOPMENT PERMIT - Elmer's Two Mile Creek improvements (See LUR2008-00068 for previously approved channel work) Type of Floodplain Permit: Floodplain Review W/O Analysis Creek Name: Elmer's Two Mile Flood Protection Elevation: Not applicable Conditions of Approval The proposed projecUactivity is approved on the basis that it satisfies applicable requirements of Chapter 9-3-3, "Floodplain Regulations," Boulder Revised Code 1981. Other floodplain requirements as set forth in Chapter 9-3-3 which are not specifically outlined in the conditions of approval below remain applicable to this projecUactivity. The fence shall be securely anchored to resist damage and washing away as debris during flooding events. Inspections To schedule an inspection, call 303-441-3280 and refer to your permit number (LUR2009-00017). ATTACHMENT K CITY DEPARTMENT OF PUBLIC WORKS ~/~'~'1/i~~ _ O~'1 P.O.Box 791 ~ B UULDRR 1739 Broadway ~ Boulder, Colorado 80306-0701 To: Jeff Arthur Katie Knapp From: Annie Noble Date: February 11, 2009 Subject: Elmer's "I'womile Flood Permit Amendment I would like to request that the Elmcr's Twomile Flood Permit be amended to include the temporary impacts during construction, as well as permanent structures associated with the project that were not shown in the original flood permit application, but will be constructed prior to the completion of the Letter of Map Revision. After meeting with several Project Specialists and both of you, I now understand that this information should have been included in the original flood permit application. Given the complexity of this project and the city's unique flood regulations, the consultant submitting the original Hood permit was not aware that these additional issues would trigger a flood permit requirement. I am therefore requesting that this be considered as an amendment to the original permit. It is my understanding that the requirements for flood permits for this project fall under three general areas: • the channel improvements • temporary impacts that result from the construction of the channel improvements within the floodplain • permanent structures that arc part of the channel improvement project that were not submitted with the original flood permit application, but will be constructed before the I,OMR 't'emporary impacts at 2727 Valmont are associated with a temporary parking lot which the city is providing for the residents of Shady I-Iollow and the employees of the Platte River Associates while the contractor is installing the box culvert for the flood mitigation improvements through tl~cir parking lot. "1'he temporary impacts resulting from the construction of this parking lot (Sheet 39 of the construction plans) include the temporary installation of four 9" diameter light poles, 387 feet of temporary chain link fence (running in the direction of flood water flow). The placement of 4" of recycled asphalt will be offset by the material removed so that the parking lot will match existing grade. Attached is a letter ti-om W H Pacific, the design engineer for these flood improvements, indicating that these impacts aze "immeasureable". 'I~he permanent structures that are part of the channel improvement project include the removal and replacement of the Shady I Iollow carports and storage shed, trash and recycle enclosures, a mail box structure, bike racks, steel and chain link fence and landscaping. These elements of the project will be constructed after the completion of the (loud mitigation improvements on each parcel, but prior to the submittal of the Letter of Map Revision. Attached are the appropriate pages of the construction plans that identify the removal and installation of these structures. Please let me know if there is any additional information needed. [would appreciate a review and approval of'this amendment to the existing flood permit for this project as soon as possible. Thank you for your assistance in this process. 1~ WHPac~ic February 10, 2009 Ms. Annie Noble Project Manager Utilities Division City of Boulder P.O. Box 791 Boulder, CO 80306 Re: Floodplain Development Permit for Elmer's Two Mile Creek Dear Ms. Noble: The construction of the Elmer's Two Mile Creek Trail Connection and Drainageway project requires the construction of a temporary parking lot on the north side of Valmont Road. We understand that the temporary parking lot will include four 9-inch diameter light poles, spaced approximately 80 feet apart, along the west side of the parking lot. Also, a temporary chain link fence will be constructed along the east side of the parking lot, from the northwest comer of the existing building near Valmont Road north to the existing fence along the Tebo property line. The temporary parking lot, light poles and chain link fence are within the existing 100-year Floodway (conveyance zone) for Elmer's Two Mile Creek. The light poles and chain link fence will be installed in an orientation that is generally parallel to the flow direction on Elmer's Creek. It is our opinion that the installation of the temporary light poles and chain link fencing will have an immeasurable effect on the 100-year floodway elevation. Please contact us if you have any questions, or need additional information. Sincerely, ~ •~otsrER . ~GN~. i 7503 , Michael R. Galuzzi, 2~/0/~~= cPL•• Si .,c r Senior Engineer ;;;E ~F ~~L~~~~;; 1 t 2596 W Bayaud Avenue, Sui[e 200 Lakewood, CO 80228 T 303.458.5550 F 303.480.9766 wr+v+.whpacific.com t,~: e'