Loading...
Park West CC(4)-CS 960312nib ~ NORTHWESt- ~L'~A DR,VE H lffA 'ate DALLAS. TEXAS 75225 · ,- a s s o c 1 s ,~,~, 739.0094 lib FAX,~. 7~-oo~ ENGINEERS · ARCHITECTS . SCIENTISTS PLANNERS · SURVEYORS March 12, 1996 AVO 13447 City of Coppell 255 Parkway Blvd. Coppell, Texas 75019 Attn: Michael Martin ..M .T. posi~r~ Re: ~roposed Rail Spur at Park West Gommerce Genter Dear Mike: Enclosed is a set of plans for a proposed Railroad Spur and Trestle to serve MJ Designs and Park West Commerce Center near Southwestern Boulevard in Coppell. We are submitting these plans for your approval, as required by a contractual agreement between Prentiss Properties and Dupey Management Corporation (MJ Design). Please respond by stating your approval, or that the City of Coppell has no jurisdiction in this matter. I have also included a copy of the Conditional Letter of Map Revision from FEMA and a letter from the Southern Pacific Railroad. Please let me know if l can help in this approval process. Sincerely, HALFF ASSOCIATES, INC. Dennis J. Chovan, P.E. DALLAS · FORT WORTH · HOUSTON · ARLINGTON · McALLEN · CHICAGO TRANSPORTATION · WATER RESOURCES · LAND DEVELOPMENT · MUNICIPAL · ENVIRONMENTAL · STRUCTURAL MECHANICAL · ELECTRICAL · SURVEYING · GEOGRAPHIC INFORMATION SYSTEMS ARCHITECTURE · LANDSCAPE ARCHITECTURE · PLANNING E:IVED  JAN 3 o 1996 Southern Pacific Lines Southern Pacific Building ' One Market Plaza · San Francisco, California 94105 F~ P. Reilly Vice President and Chief Engineer 948 150/369.2 3anuary 22, ].996 Mr. Grover C. Wilkins, Jr. Halff Associates Inc. 8616 Northwest Plaza Drive Dallas, TX 75225 Dear Grover, Please refer to your letter of August 30, 1995, concerning the proposed drill track to serve MJ Designs in the Parkwest Commerce Center in the City of Copell. The plans appear to be satis[actory. Very truly,yours, cc: Mr. J. W. Smith - Houston Federal Emergency Management Agency. Washington, D.C. 20472 AUG The Honorable Mark Wolfe Case No.: 91-06-21R Mayor of the City of Coppell Community: City of Coppell, P.O. Box 478 ~ Dallas County, Coppell, Texas 75019 Texas Community No.: 480170 Dear Mayor Wolfe: This is in reference to a letter dated December 14, 1990, from Ms. M. Shohre Daneshmand, P.E., Acting Coppell City Engineer, requesting a conditional Letter of Map Revision (LOMR) to reflect the effects on Grapevine Creek of a proposed dual bridge project at Southwestern Boulevard and a proposed railroad bridge project approximately 2,200 feet upstream of Southwestern Boulevard. With her letter, Ms. Daneshmand submitted a technical report entitled Flood- plain Study on Grapevine Creek Southwestern Boulevard to ~H-635 for the City of Coppell, Texas, dated September 28, 1990, prepared by Albert H. Halff Associates, Inc. This report included the following: HEC-2 models reflecting existing and proposed conditions along Grapevine Creek for the 10-, 50-, 100-, and 500-year floods, dated September 26, 1990; a description of the hydraulic methodology; and delineations of the lO0-year floodplain boundaries and floodway reflecting existing and proposed conditions. Ail necessary data to process this request were received by February 12, 1991. Fees necessary to process this conditional LOMR (a coral of $1,617) have been received. This request represents an addendum to a conditional LOMR issued on August 18, 1987, that concerned a proposed extension of the channelization on Grapevine Creek and the addition of a concrete drop structure eo alleviate high channel velocities at the upstream end of the channelization. In the August 18, 1987 conditional LOMR, it was stated that the Federal Emergency Management Agency (FEMA) would not perform a revision to the effective Flood Insurance Study (FIS) amd Flood Insurance Rate Map (FIRM) for the City of Coppell to reflect the completed portion of the Grapevine Creek channel modification project until the proposed drop structure was completed, due to the unstable condi- tions created by the partially completed project. It is our understanding that the proposed drop structure is not yet constructed, nor is it likely to be built in the near future. On the basis of our review of the submitted technical data, we determined that the proposed Southwestern Boulevard to IH-635 project meets the minimum.. floodplain management criteria of the National Flobd Insurance Program (NFIP). If the project were completed as proposed, a revision to the FIS and FIRM for the City of Coppell would be warranted. This revision would reflect a decrease in the Base (100-year) Flood Elevations (BFEs) and would modify the 2 lO0-year floodplain boundaries and floodway, as indicated by the submitted technical data. Please note that this determination is based on conditions that include the proposed drop structure and channelization. FEMA will not revise your communityrs maps until all phases of the proposed project have been completed. This conditional LOMR is based on minimum floodplain management criteria established under the NFIP. Your community is responsible for approving all proposed floodplain development, including the project upon which this request is based, and for ensuring that permits required by Federal or State law have been received. State and. community officials, based on knowledge of local conditions and in the interest of safety, may set higher standards for construction or may limit development in floodplain areas. If the State of Texas or the City of Coppell has adopted more restrictive or comprehensive floodplain management criteria, those criteria take precedence over the minimum NFIP requirements. It should be noted that NFIP regulation Subparagraph 60.3(b)(7) requires communities to "assure that the flood carrying capacity within the altered or relocated portion of any watercourse is maintained." This provision is incorporated into your community's existing floodplain management regulations; consequently, responsibility for maintenance of the modified channel rests with your community. Please be aware that FEMA may request that your com- munity submit a description and schedule of channel maintenance activities. Upon completion of the entire proposed project, your community may request a revision to the effective FIS and FIRM. The revision request should be submitted to our Region VI office and must include the data listed below: 1. Evidence of compliance with NFIP regulation Paragraph 65.4(b), which states that "all requests for changes to effective maps . must be made in writing by the community's Chief Executive Officer (CEO) or an official designated by the CEO. Should the CEO refuse to submit such a request on behalf of another party, FEMA will agree to review it only if written evidence is provided indicating the CEO or designee has been requested to do so." 2. "As-built" plans of the bridge construction project including drop structure and channelization, certified by a registered professional engineer. 3. HEC-2 hydraulic models of the 10-, 50-, 100-, and 500-year floods and floodway representing "as-built" conditions. The elevations in the "as-built" HEC-2 models must coincide with the effective FIS elevations at the upstream and downstream ends of the project. 4. Delineation of the 100- and 500-year floodplain boundaries, the floodway, and the locations and alignment of the cross sections and flow line used in the hydraulic model. a. This information should be shown on a map of suitable scale and topographic definition to provide reasonable accuracy. b. Ail items should be labeled for easy cross-referencing to the hydraulic model and summary data. 5. ~ource data a~d engineering documentation for'the previousl~ mentioned items, as well as a bibliographic list of other sources of information used. Please note items 3, 4, and 5 have been submitted for proposed conditions; if any changes take place during construction, these items must be resubmitted to reflect ~as-built~ conditions. We have enclosed a copy of Part 65 of the NFIP regulations, which further describes the nature and extent of the material needed to support a request to revise an effective FIS and FIRM. Compliance with the criteria outlined in these documents will expedite FEMAts review process, thus allowing the FIS and FIRM for the City of Coppell to be revised as appropriate, in a timely manner. Should you have any questions regarding this matter, please do not hesitate to contact the Chief, Natural and Technological Hazards Division of the Federal Emergency Management Agency in Denton, Texas, at (817) 898-5127 or Matthew B. Miller of our Headquarters staff in Washington, D.C., at (202) 646-3461. Sincerely, William R. Locke Chief, Risk Studies Division Federal Insurance Administration Enclosure cc: Ms. Jean Hansen, Albert H. Halff Associates, Inc. Ms. M. Shohre Daneshmand, P.E.