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Nlake WE P12/FP-CS 890228 Texas 75251 · (214) 386-7007 Raleigh, Charlotte, Nashvile, Virginia Beach, Washington, Dallas, Phoenix, West Palm Beach, Tampa, Odando, Ft. Lauderdale, Veto Beach, FL Myers, Stuart - Kimley. Horn and Associates, Inc. 12660 Coit Road, Suite 200, Dallas, February 28, 1989 732 DeForest Coppell, Texas 75019 Re: Review of Northlake Woodlands East No. 12; CoppeH, Texas; Job # 9314.00 Dear Mr. Doyle: We have investigated the data provided for the subject development and find that it is not sufficient to complete our review. We suggest you provide the attached letter to Mr. Porter for additional information. Call me if you have questions. Sincerely, KIMLEY-HORN AND ASSOCIATES, INC. Ronald W. Morrision, P.E. Senior Hydrologist pw Attachment Copy to: Kevin Pfiefer, P.E., Ginn Inc. Building client relationships since 1967 February 28, 1989 Mr. Robert Porter Project Manager Don A. Tipton Inc. 6330 Beltline Road Suite C Garland, Texas 75043 Re: Northlake Woodlands East No. 12 Coppell, Te=sg Dear Mr. Porter: We have received the following information from your office regarding the subject project: 1. A letter dated February 7, 1989 authorizing an expenditure of up to $1,000 as a fee for review of the material submitted. 2. HEC-2 computer model of Grapevine Creek (8901J006 * GRAPDAT3). Preliminary set of construction drawings for the subject project. This set includes a cover sheet, final plat, drainage map, paving plan, storm sewer plan, water and sewer plan, sanitary sewer profiles, flood study sheet, and flood study cross sections. This information is not sufficint to complete our review of your proposed project. We have included a checklist of items required under our Ordinance No. 87390. We suggest you review these items and resubmit the data. You may contact us for further information. Sincerely, CITY ENGINEER pw Attachment FLOODPLAIN DEVELOPMENT CHECKLIST The following items represent a brief outline of items required by the City of Coppell in order to develop in a floodplain. References are taken from Ordinance 87390. Reference Item Art. 4C-2 All models must refer to the 2 yr, 100 yr existing, 100 yr ultimate, and low flow. Art. 4C-2(a) Lowest floor must be higher than BFE + 2' and 100 yr (ULT.) + 1'. Art. 4C-2(b) Existing and fully developed 100-year floodplain must be delineated. Art. 4C-2(c) Determine flood storage loss data. Art. 4C-2(e) Flood levels caused by the development plus any anticipated future developments must be less than the 100 yr (ULT) and the 1980 FIS BFE + 1'. Art. 4C-2(f) Any changes in the floodplain must be submitted to FEMA according to their procedures. Art. 4C-2(g) Must show evidence of all necessary permits; Local, State and Federal. Art. $B-1,2 Elevation of lowest floor of shallow flooding areas must be greater than highest adjacent grade + 2' or the structure must be flood protected. Art. 5B-1-2 All work must be certified by a P.E. or R.P.S. Art. 5C-4 The following special note must be included on the plat "Floodplain Development Permit Application No. has been filed with the City of Coppell Floodplain Administrator on , 19 , Floodplain Administrator Date. Art. $C-5 Boundry's of floodplain and floodway must be shown on plats. Art. 5C-6 Lowest floor elevations for each lot must be shown on site grading plan. Art. 5C-7 A permanent bench mark must be established within a subdivision development. Art. 5C-8 A following special note must be included on the plat. "The developer, builder, seller or agent shall inform in writing, each prospective buyer of subdivision lots or property located within special flood hazard areas of this site that such property is in an identified flood hazard area and that all development must conform to the provisions of the City of Coppell Floodplain Management Ordinance. The written notice shall be filed for record in the County deed records and a copy of the notice must accompany the application for development permit." '~he above items are only a brief checklist of items need to comply with Ordinance No. 87390, a detailed review of this Ordinance is necessary in order to fully understand its contents. Any submittal in connection with a floodplain development must include the above items. This submittal must as a minimum also include the following: Text describing where the basic data was obtained, what is intended, and the results, all in sufficient detail so that it is fully understandable and supportable. o Exhibits must be presented that clarify data. These must include: Water surface profiles, cross sections, work maps, floodplain and floodway delineations for both existing and improved conditions. Comparisons must be shown between existing and proposed conditions for velocities, water surface elevations, storage, and any other impacts. O Computer models must be presented in detail, Not just input and/or summary printouts.