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Home My WebLink AboutESC OFFICE ADDITION - PDP - 6-06 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTO.M.B. NO. 3067-0077 Expires July 31, 2002 FEDERAL EMERGENCY MANAGEMENT AGENCY NATIONAL FLOOD INSURANCE PROGRAM FLOODPROOFING CERTIFICATE FOR NON-RESIDENTIAL STRUCTURES The floodproofing ofnon-residential buildings may be permitted as an alternative to elevating to or above the Base Flood Elevation; however, a floodproofing design certification is required. This form is to be used for that certification. Floodproofing of a residential building does not alter a community's floodplain management elevation requirements or affect the insurance rating unless the community has been issued an exception by FEMA to allowfloodpmofed residential basements. The permitting of floodproofed residential basement requires a separate certilication specifying that the design complies with the local floodplain management ordinance. - FOR INSURANCE COMPANY USE BUILDING OWNER'S NAME POLICY NUMBER muL9612eY PAZPJF_P_S l L-i-e. STREET ADDRESS (Including Apt., Unit, Suite, and/or Bldg. Number) OR P.O. ROUTE AND BOX NUMBER � I� 11' rMVt ' EdB*n q ST COMPANY NAIC NUMBER OTHER DESCRIPTION (Lot and Blooclk`Numbers, etc.) CITY - STATE ZIP CODE _T toe:r cau NS Co t'05a 1 SECTION I FLOOD INSURANCE RATE MAP (FIRM) INFORMATION Provide the following from the proper FIRM: COMMUNITY NUMBER PANEL NUMBER SUFFIX DATE OF FIRM INDEX FIRM ZONE BASE FLOOD ELEVATION 05010z 00 c ��N '9� (In AO Zones, Use Depth) SECTION II FLOODPROOFING INFORMATION (By a Registered Professional Engineer or Architect) Floodproofing Design Elevation Information: Building is floodproofed to an elevation of .... ..... feet NGVD. (Elevation datum used must be the same as that on the FIRM.) Height of floodproofing on the building above the lowest adjacent grade is ............. b.. I.................. -feet. - (NOTE: for insurance rating purposes, the building's floodproofed design elevation must be at least one foot above the Base Flood Elevation to receive rating credit. If the building is floodproofed only to the Base Flood Elevation, then the building's insurance rating will result in a higher premium.) SECTION III CERTIFICATION (By Registered Professional Engineer or Architect) Non -Residential Floodproofed Construction Certification: I certify that based upon development and/or review of structural design, specficaflons, and plans for construction, the design and methods of construction are in accordance with accepted standards of practice for meefing the following provisions: The structure, together with attendant utilities and sanitary facilities, is watertight to the floodproofed design elevation indicated above, with walls that are substantially impermeable to the passage of water. All structural components are capable of resisting hydrostatic and hydrodynamic flood forces, including the effects of buoyancy, and anticipated debris impact forces. I certify that the information on this certificate represents my best efforts to interpret the data available. I understand that any false statement maybe punishable by fine or imprisonment under 18 U.S. Code, Section 1001. CEF;TIFIER'S`'�d1I 13, NAME �t/ - LICENSE NUMBER (or Affieat) - ..ffVV�i)[[�.VVVV w � - 20� � x 'Q_e�atdo TITLI�� CQMPyNY NAM rGt,I �a1t I I) & �-r I t P. C . ADDATE 72 5 SuI46 F3`n0 C0 ZIC05 25 SIGN RE DATE PHONE P/7 0 (170) 225-1020 Copies shoul4epdde of this Certificate for. 1) community official, 2) Insurance agent/company, and 3) building owner. FEMA Fortin 81-65, AUG 99 Replaces all previous editions - F-056 (8/99) EXHIBIT D TOTAL SITE IMPERVIOUSNESS ee 51 ALLEY i } 765 SF'.'.'.:•:• W J J Q 21,002 SF 332 SF TTr 1962 SF :::::•::•:•:•:•:•: ..1008 SF . f ...... . 17111111111 --- MULBERRY STREET N jINC. CONSULTING ENGINEERS 30 O 30 60 scale 1 "=30' feet No Text EXHIBIT B EXISTING IMPERVIOUSNESS ALLEY OVMPSIE di W 111 756 SF i J J Q � I I 1760 SF uu N MULBERRY STREET TST, INC. CONSULTING ENGINEERS 20 0 20 40 scale 1 "=20' feet No Text According to this analysis a drainage report and storm water detention are not required for the planned improvements. Please see Exhibits B and C for detailed existing and proposed imperviousness information. Under the second criteria mentioned, a drainage report and storm water detention are required if the sites total imperviousness is greater than 90 percent. Total Area of Lots 210 and 212 21,002 sf (Including half of Mulberry and both Alleys) Total Pervious Area -4.133 sf (Including all Planned Construction) 16,869 sf Total Site Imperviousness = 16,869 sf/21,002sf = 80 percent Since the total site imperviousness is less than 90 percent, a drainage report and storm water detention is not required for the planned improvements. Please see Exhibit D for detailed imperviousness area information. The City of Fort Collins typically requires submission of erosion control (effectiveness) calculations for each development. Since the site itself and all site work is concentrated on two small lots (0.48 acres), the erosion control calculations will not be necessary. Erosion control measures will still be implemented with this development, even though the calculations are not required. Silt fence will be placed around the site as necessary and straw wattles will be utilized to prevent the transportation of sediment from the site. The stated temporary Best Management Practice's (BMP's) will be monitored regularly to ensure their effectiveness and will be repaired or replaced as necessary. Thank you for your time to review the drainage analysis for our site. We feel this letter satisfies the City of Fort Collins criteria for this site and we look forward to your comments. Sincerely, TST, INC. CON/SSULTING ENGINEERS �R. , / W4, David A. Huwa DAH/SFH/mgf 7 hen F. Humann, P.E. Al HIM TST 748 Whalers Way, Bldg, D Fort Collins, CO 80525 970.226.0557 metro 303.595.9103 fax 970.226.0204 TST, INC. CONSULTING ENGINEERS March 8, 2006 Mr. Glen Schleuter City of Fort Collins 700 Wood Street Fort Collins, CO 80522 Re: Lots 210 & 212 West Mulberry Project No. 0415.0004.00 Dear Mr. Schleuter, The purpose of this letter is to demonstrate that the planned improvements to lots 210 and 212 (ESC Office Expansion) on West Mulberry meet the City of Fort Collins criteria with regards to storm water detention and water quality detention in addition to any erosion control effectiveness. Please see Exhibit A for a vicinity map of the proposed construction. The majority of the planned improvements are to occur on lot 210, however, some minor improvements (curb and gutter, paving) will occur on lot 212. Improvements on lot 210 include demolishing of an existing building, expansion of the existing building into lot 210, and construction of a new parking lot. City of Fort Collins criteria states the following: (1) a drainage report and storm water detention are required if more than 5,000 square feet of imperviousness is added to the site with the planned construction, (2) a drainage report and storm water detention are required if the total imperviousness of the site including up to half of all adjoining streets was greater than 90 percent. For this development, water quality detention is not required per comments from Glen Schleuter, from the conceptual review of the office expansion, stating that all storm water drains to the Udall Natural Area and water treatment facility, eliminating the need for water quality detention. Under the first criteria mentioned, a drainage report and storm water detention are required if the additional imperviousness generated by the planned construction is greater than 5,000 square feet. All existing impervious areas on both lots consist of the building on lot 210 and some curb and asphalt paving. All new construction on both lots consists of the office addition, curb and gutter, and asphalt paving. Since some of the proposed impervious areas simply replace existing impervious areas, not all of the new construction is considered as additional impervious area. As a result, the total increase in impervious are for both lots is approximately 2,994 square feet. See table below for verification. Total Imperviousness of New Construction 5,510 sf Imperviousness of Demolished Building -1,760 sf Imperviousness of Replaced Pavement -756 sf 2,994 sf Additional Impervious Area = 2,994 sf info@rstinc.com w I ■ .tstinc.com